Aldrin told the captivated audience at Los Angeles’ Ronald Reagan Presidential Library, “We did not know the instant of leaving the ground. We only knew it from the instruments and voice communications which confirmed liftoff. We sort of looked at each other and thought, ‘We must be on our way.’” Photo Credit: Jeff Gritchen, Orange County Register/SCNG/Getty Images

Buzz Aldrin at Los Angeles’ Ronald Reagan Presidential Library

Today's Image of the Day from NASA Webb Images features an extraordinary view of Uranus, the seventh planet from the sun in our solar system.&nbsp;



The photo reveals the rings, moons, and extreme seasons of the ice giant Uranus in unprecedented detail.&nbsp;



<h2 class="wp-block-heading" id="h-dynamic-north-polar-cap-nbsp">Dynamic north polar cap&nbsp;</h2>



“The Webb image exquisitely captures Uranus’s seasonal north polar cap, including the bright, white, inner cap and the dark lane in the bottom of the polar cap,” noted NASA.



Unlike Earth, where polar ice caps are formed by the freezing of water, Uranus's polar caps are thought to be primarily composed of a dense concentration of haze in the atmosphere.&nbsp;



The polar cap's haze is likely composed of methane particles. Methane in Uranus's atmosphere condenses into ice particles, which then create a thick haze that scatters sunlight, giving the polar cap its distinct bright appearance in visible and infrared light.



The polar cap is dynamic and changes over time. It becomes more prominent during the summer season of each pole. 



As Uranus moves along its orbit, the cap's appearance transforms, with the haze becoming thicker and brighter when the pole is in continuous sunlight.



<h2 class="wp-block-heading" id="h-the-zeta-ring-nbsp">The Zeta ring&nbsp;</h2>



The inner and outer rings of Uranus are visible in the image, including Zeta - the innermost ring which is the faintest and most difficult to observe.



The <a href="https://www.earth.com/news/stunning-photo-of-uranus-and-its-rings-and-moons-captured-by-the-webb-telescope/" target="_blank" rel="noreferrer noopener">rings of Uranus</a> are primarily composed of narrow bands of particles, likely made of water ice mixed with a dark material. These rings are distinct from those of Saturn in that they are much darker and narrower.



The faintness and characteristics of the Zeta ring make it a subject of interest in studies related to the dynamics and composition of planetary ring systems.



<h2 class="wp-block-heading" id="h-moons-of-uranus-nbsp">Moons of Uranus&nbsp;</h2>



The <a href="https://science.nasa.gov/mission/webb/multimedia/images/" target="_blank" rel="noreferrer noopener">Webb</a> photo also features nine of the planet’s <a href="https://www.earth.com/news/nasa-four-uranus-moons-may-have-oceans-that-are-miles-deep/" target="_blank" rel="noreferrer noopener">moons</a>, which appear as blue dots surrounding the rings.&nbsp;



“Clockwise starting at 2 o’clock, they are: Rosalind, Puck, Belinda, Desdemona, Cressida, Bianca, Portia, Juliet, and Perdita. The orbits of these moons share the 98-degree tilt of their parent planet relative to the plane of the solar system,” noted NASA.



Uranus has 27 known moons, and they are divided into three main groups based on their orbits: the inner moons, the major moons, and the irregular moons.



The <a href="https://www.earth.com/news/uranus-moon-ariel-may-have-a-hidden-ocean/" target="_blank" rel="noreferrer noopener">moons</a> of Uranus are unique because they are named after characters from the works of William Shakespeare and Alexander Pope, rather than being named after figures from classical mythology, as is common for the moons of other planets.



<h2 class="wp-block-heading" id="h-the-ice-giant-uranus-nbsp">The ice giant Uranus&nbsp;</h2>



Uranus is classified as an "ice giant" because, unlike the gas giants Jupiter and Saturn, which are primarily composed of hydrogen and helium, Uranus has a significant proportion of "ices" in its composition.&nbsp;



In astronomical terms, ices refer to volatile substances like water, ammonia, and methane, which exist in solid or liquid forms at the low temperatures found in the outer solar system.



Uranus has a thick atmosphere of hydrogen and helium, but beneath that, it contains a large, dense mantle composed of these ices, along with rock and other heavier elements.&nbsp;



The term <a href="https://www.earth.com/news/diamond-rain-may-be-common-on-giant-icy-planets/" target="_blank" rel="noreferrer noopener">ice giant</a> differentiates Uranus (and Neptune, the other ice giant) from the larger gas giants, emphasizing the different chemical compositions and internal structures of these planets.



<h2 class="wp-block-heading" id="h-climate-of-uranus-nbsp">Climate of Uranus&nbsp;</h2>



Uranus has a unique and extreme climate, largely influenced by its unusual tilt, which causes the planet to rotate almost on its side. This tilt leads to extreme seasonal variations, with each pole experiencing 42 years of continuous sunlight followed by 42 years of darkness.&nbsp;



Even though it is closer to the sun than Neptune, Uranus is the coldest planet in the solar system, with temperatures plunging to as low as -224°C (-371°F). The reason for this is not fully understood, but it might be due to an internal heat distribution anomaly.



Despite these frigid conditions, Uranus experiences intense weather patterns, including powerful storms and winds that can reach speeds of up to 900 kilometers per hour. These winds blow in the same direction as the planet’s rotation and are some of the fastest in the solar system.



Storms on Uranus are driven by its internal heat and the interaction of its <a href="https://www.earth.com/news/uranus-is-more-gassy-less-icy-than-we-ever-imagined/" target="_blank" rel="noreferrer noopener">atmospheric gases</a>. Observations have shown that these storms can be quite large, sometimes comparable in size to the Earth, and can last for several years.&nbsp;



The planet’s extreme axial tilt also means that the storms and weather patterns are highly variable, depending on the season. During equinoxes, when the Sun is directly over the equator, Uranus exhibits more storm activity compared to when the poles are pointed towards the Sun or away from it.



<h2 class="wp-block-heading" id="h-observations-of-uranus">Observations of Uranus</h2>



“One day on Uranus is about 17 hours, so the planet’s rotation is relatively quick. This makes it supremely difficult for observatories with a sharp eye like Webb to capture one simple image of the entire planet - storms and other atmospheric features, and the planet’s moons, move visibly within minutes,” explained NASA.



“This image combines several longer and shorter exposures of this dynamic system to correct for those slight changes throughout the observing time.”



The first recorded observations of Uranus were made by John Flamsteed on December 13, 1690. However, Flamsteed mistakenly identified the planet as a star, which he named “34 Tauri."&nbsp;



It wasn't until March 13, 1781, that Uranus was officially identified as a planet by William Herschel. He initially thought he had discovered a comet, but further observations and calculations by other astronomers confirmed that it was a new planet, making Uranus the first planet discovered in modern history with the aid of a telescope.



Image Credit: NASA, ESA, CSA, STScI



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

The ice giant Uranus in stunning detail

Today's Image of the Day from NASA Webb Images features...

Today's Image of the Day from NASA Earth Observatory features a strong extratropical cyclone, which struck the Pacific Northwest on November 19, 2024.



“The storm knocked over trees and left nearly 600,000 people without power in Washington state on November 20, according to news reports,” noted <a href="https://search.app?link=https%3A%2F%2Fearthobservatory.nasa.gov%2Fimages%2F153605%2Fextratropical-cyclone-whips-over-the-pacific-northwest&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">NASA</a>. “This image shows the storm system at 1:50 p.m. Pacific Time on November 19.” 



According to NASA, mature extratropical cyclones like this often feature comma-shaped cloud patterns that are the product of ‘conveyor belt’ circulation. “Heavy precipitation is often present near the low-pressure head of the comma.”



<h2 class="wp-block-heading" id="h-impacts-of-the-extratropical-cyclone-nbsp">Impacts of the extratropical cyclone&nbsp;</h2>



The “bomb cyclone” brought <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fhow-much-does-climate-change-influence-extreme-weather-events%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">severe weather</a>, including strong winds exceeding 70 mph, heavy rainfall, and snow in higher elevations. These conditions led to significant disruptions, including downed trees and hazardous travel conditions.



In urban and rural areas, damage to infrastructure and properties was substantial, with emergency responders and utility crews working around the clock to restore services.&nbsp;



Additionally, mountain passes faced dangerous blizzard conditions, with up to 20 inches of snow accumulating in some areas, severely affecting travel.



<h2 class="wp-block-heading" id="h-rapid-pace-of-acceleration">Rapid pace of acceleration</h2>



Chris Dolce is a meteorologist at The Weather Channel. He noted that on the evening of November 19, the storm’s central pressure dropped to levels on par with a storm in October 2021, which saw the lowest pressure in about 50 years of records for that region.



“The pace of the storm’s intensification was more than double the criteria for bombogenesis - a popular term that describes a midlatitude cyclone that rapidly intensifies into a ‘bomb cyclone,’” said NASA.



The rapidly dropping atmospheric pressure at the center of the <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fcoastal-hurricanes-are-intensifying-faster-due-to-climate-change%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">storm</a> caused winds to intensify quickly. According to the National Weather Service in Seattle, wind gusts reached up to 77 miles per hour in the mountains southeast of the city.



“The cyclone kicked off a long-duration atmospheric river that forecasters expect will park over Northern California and southern Oregon through November 22. The National Weather Service estimates that these areas could see rainfall totals of 12 to 16 inches over the duration of the storm,” noted NASA.



<h2 class="wp-block-heading" id="h-what-is-an-extratropical-cyclone">What is an extratropical cyclone?</h2>



An extratropical cyclone is a large-scale weather system that forms outside the tropics, typically between 30° and 60° latitude, and is associated with areas of low pressure.&nbsp;



<h3 class="wp-block-heading" id="h-energy-source">Energy source</h3>



These cyclones obtain their energy from the contrast in temperature between air masses, such as cold polar air and warm subtropical air. This contrast creates instability and drives atmospheric circulation.



<h3 class="wp-block-heading" id="h-development-of-extratropical-cyclones-nbsp">Development of extratropical cyclones&nbsp;</h3>



Extratropical cyclones usually have well-defined warm and cold fronts. They often develop along the polar front, where cold and warm air masses meet.



A common area for their development is the mid-latitudes, particularly in regions like the North Atlantic and North Pacific.



<h3 class="wp-block-heading" id="h-weather-conditions">Weather conditions</h3>



Extratropical cyclones can bring a variety of <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fhuman-activity-is-rapidly-changing-weather-in-north-america%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">weather conditions</a>, including heavy rain, snow, strong winds, and severe storms. They are responsible for much of the day-to-day weather in mid-latitude regions.



<h3 class="wp-block-heading" id="h-tropical-vs-extratropical-cyclones-nbsp">Tropical vs. extratropical cyclones&nbsp;</h3>



While <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Ffast-moving-tropical-cyclones-are-becoming-more-powerful%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">tropical cyclones</a> derive energy from warm ocean waters and have a warm core, extratropical cyclones gain energy from temperature contrasts and have a cold core.



Tropical cyclones typically lack fronts, whereas extratropical cyclones are defined by them.



These systems are essential in distributing heat and energy across the planet, playing a critical role in the Earth's climate system.



<h2 class="wp-block-heading" id="h-caught-off-guard-by-the-weather">Caught off guard by the weather</h2>



The bomb cyclone in the Pacific Northwest highlights the importance of <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fnew-era-in-forecasting-ai-will-improve-extreme-weather-warnings%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">preparedness</a>, as residents were urged to secure loose outdoor items, stock emergency supplies, and avoid unnecessary travel.



The fire department in Bellevue, east of Seattle, posted a Severe Weather Safety alert on Facebook: “It’s severe out there. Trees are coming down all over the city, with multiple falling onto homes. If you are able, head to the lowest floor you can and stay away from windows. Do not go outside if you can avoid it.”



The image was captured by the VIIRS (Visible Infrared Imaging Radiometer Suite) on NOAA’s JPSS-1 (Joint Polar Satellite System-1).



Image Credit: NASA Earth Observatory



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Bomb cyclone rapidly intensified in the Pacific Northwest

Today's Image of the Day from NASA Earth Observatory features...

Today's Image of the Day from the European Space Agency features the barred spiral galaxy NGC 1559, located around 35 million light-years away in the little-observed southern constellation Reticulum. The image was captured by the James Webb Space Telescope.&nbsp;



<h2 class="wp-block-heading" id="h-fuel-for-star-formation">Fuel for star formation </h2>



"The data featured in this portrait make use of two of Webb’s instruments: the Mid-InfraRed Instrument (MIRI) and Near-InfraRed Camera (NIRCam)," noted <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



"Here MIRI captures the glow of interstellar dust grains, which trace out the interstellar medium, the fuel for future star formation. NIRCam shows the light from stars, even young stars hidden behind prodigious amounts of dust. NIRCam also captures emission from ionised nebulae around young stars."



<h2 class="wp-block-heading" id="h-webb-reveals-galaxies-in-new-light">Webb reveals galaxies in new light</h2>



According to ESA, the data was collected by the <a href="https://sites.google.com/view/phangs/home">PHANGS team</a> as part of a program in which Webb will observe 55 <a href="https://www.earth.com/news/james-webb-captures-galaxies-that-are-too-old-to-exist/">galaxies</a> that have also been mapped by the Atacama Large Millimeter/submillimeter Array (ALMA) radio telescope, the Hubble Space Telescope, and more.&nbsp;



"By combining Webb’s unprecedented view of the dust and stars with data from these other facilities, the team aims to obtain a new, highly detailed view of how stars are born, live, and die in galaxies across the Universe."



<h2 class="wp-block-heading" id="h-ngc-1559-a-loner-in-space">NGC 1559: A loner in space</h2>



Although NGC 1559 appears to sit close to one of our nearest neighbors in the sky - the Large Magellanic Cloud (LMC) - this is just a trick of perspective, noted ESA.



While it is part of the Reticulum constellation, NGC 1559 is not part of the Local Group of galaxies but instead resides in a more distant region of space.



"In reality, NGC 1559 is physically nowhere near the LMC in space; in fact it truly is a loner, lacking the company of any nearby galaxies or membership of any galaxy cluster."



<h2 class="wp-block-heading" id="h-star-formation-in-ngc-1559">Star formation in NGC 1559</h2>



NGC 1559 is notable for its active star formation and strong magnetic fields. It has also been the site of several <a href="https://www.earth.com/news/supernova-explosions-could-damage-distant-planets/" target="_blank" rel="noreferrer noopener">supernovae</a>, making it of particular interest to astronomers studying stellar evolution and the lifecycle of stars.



The structure of NGC 1559 includes well-defined spiral arms that are rich in young, hot stars and regions of ionized gas, indicative of ongoing <a href="https://www.earth.com/news/black-hole-is-starving-its-host-galaxy-of-star-forming-fuel/" target="_blank" rel="noreferrer noopener">star formation</a>.



The galaxy’s central bar is believed to play a role in driving gas towards the core, fueling both the star formation and the activity around its nucleus.



<h2 class="wp-block-heading" id="h-an-extragalactic-wonder">An extragalactic wonder</h2>



Despite being relatively small compared to larger galaxies like the Milky Way, NGC 1559 is an important object for understanding how barred spiral galaxies evolve and the processes that trigger supernovae.



The galaxy’s remote location and active nature make it a fascinating subject of study in the field of extragalactic astronomy. The isolation of NGC 1559 allows for a clearer view of its structure without much interference from neighboring galaxies.



<h2 class="wp-block-heading" id="h-barred-spiral-galaxies">Barred spiral galaxies</h2>



Barred spiral galaxies are a type of spiral galaxy characterized by a central bar-shaped structure composed of stars. This bar extends out from the core and connects to the galaxy's spiral arms, which swirl outward in a graceful pattern.



Scientists believe that the bar plays a crucial role in the evolution of the galaxy, funneling gas towards the core and potentially triggering star formation or feeding a central black hole. 



The <a href="https://www.earth.com/news/newly-discovered-stars-milky-way-are-old-as-universe/" target="_blank" rel="noreferrer noopener">Milky Way</a>, our own galaxy, is an example of a barred spiral. These galaxies are quite common in the universe, making up about two-thirds of all observed spiral galaxies.



The bar itself is thought to be a temporary feature, developing as the galaxy matures and possibly disappearing over time as the dynamics of the stars change. 



<h2 class="wp-block-heading" id="h-the-reticulum-constellation">The Reticulum constellation</h2>



The Reticulum constellation is a small, faint constellation in the southern sky. Its name means "the reticle" in Latin, which refers to the crosshairs in an eyepiece of a telescope. 



The constellation was named in the 18th century by the French astronomer Nicolas Louis de Lacaille to honor the reticle he used in his scientific instruments. It is one of the 88 modern constellations recognized by the International Astronomical Union.



Image Credit: ESA/Webb, NASA &amp; CSA, A. Leroy, J. Lee and the PHANGS Team



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Spiral galaxy NGC 1559 is a loner in outer space

Today's Image of the Day from the European Space Agency...

Today's Image of the Day from the European Space Agency features NGC 1792, a spiral galaxy located in the constellation Columba, about 43 million light-years away from Earth.&nbsp;



This galaxy, discovered by British astronomer James Dunlop in 1826, is part of the larger NGC 1808 group of galaxies.&nbsp;



<h2 class="wp-block-heading" id="h-intimate-view-of-ngc-1792">Intimate view of NGC 1792</h2>



“An orange glow radiates from the center of NGC 1792, the heart of this stellar forge. Captured by the NASA/ESA Hubble Space Telescope, this intimate view of NGC 1792 gives us some insight into this galactic powerhouse,” noted <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



“The vast swathes of tell-tale blue seen throughout the galaxy indicate areas that are full of young, hot stars, and it is in the shades of orange, seen nearer the center, that the older, cooler stars reside.”



<h2 class="wp-block-heading" id="h-vigorous-star-formation-nbsp">Vigorous star formation&nbsp;</h2>



NGC 1792 is notable for its vigorous star formation, classifying it as a starburst galaxy. This high rate of star formation is thought to be triggered by gravitational interactions with neighboring galaxies, though the exact cause is still under study.



“Nestled in the constellation of Columba (The Dove), NGC 1792 is both a spiral galaxy, and a starburst galaxy,” said ESA. “Within starburst galaxies, stars are forming at comparatively exorbitant rates. The rate of star formation can be more than 10 times faster in a starburst galaxy than in the Milky Way.”



<h2 class="wp-block-heading" id="h-fierce-bursts-of-star-formation">Fierce bursts of star formation</h2>



ESA noted that when galaxies have a large reservoir of gas, like NGC 1792, these short-lived starburst phases can be sparked by galactic events such as mergers and tidal interactions.&nbsp;



“One might think that these starburst galaxies would easily consume all of their gas in a large forming event. However, supernova explosions and intense stellar winds produced in these powerful starbursts can inject energy into the gas and disperse it.”&nbsp;



“This halts the star formation before it can completely deplete the galaxy of all its fuel. Scientists are actively working to understand this complex interplay between the dynamics that drive and quench these fierce bursts of star formation.”



Due to its distance and brightness, NGC 1792 can be observed with medium-sized telescopes under favorable conditions.



<h2 class="wp-block-heading" id="h-galaxy-evolution">Galaxy evolution</h2>



Galaxy evolution refers to the process by which galaxies form and change over time. It begins in the early universe, shortly after the <a href="https://www.earth.com/news/new-observations-disprove-big-bang-theory-universe-began-tired-light-theory/" target="_blank" rel="noreferrer noopener">Big Bang</a>, when small density fluctuations in the primordial gas led to the collapse of matter into the first galaxies. 



<h3 class="wp-block-heading" id="h-galaxy-mergers">Galaxy mergers</h3>



These early galaxies were small and irregular, composed mostly of gas and dark matter. Over billions of years, galaxies grew larger by merging with one another and by accreting gas from the surrounding space.&nbsp;



These interactions often triggered bursts of star formation, and collisions between galaxies sometimes led to the creation of new, more massive galaxies.



<h3 class="wp-block-heading" id="h-structural-changes">Structural changes</h3>



As galaxies evolve, their morphology - their shape and structure - can change. Early galaxies were often irregular or disk-shaped, but over time, many galaxies formed into the elliptical or spiral shapes we see today.&nbsp;



<h3 class="wp-block-heading" id="h-star-formation">Star formation</h3>



Star formation is a key driver of galaxy evolution, but it gradually slows down as galaxies age. 



The gas that fuels <a href="https://www.earth.com/news/black-hole-is-starving-its-host-galaxy-of-star-forming-fuel/" target="_blank" rel="noreferrer noopener">star formation</a> can be used up, or it can be heated and pushed out of galaxies by supernovae or black holes, reducing the galaxy's ability to form new stars.



<h3 class="wp-block-heading" id="h-galaxy-environment-nbsp">Galaxy environment&nbsp;</h3>



The environment in which a galaxy resides also plays a role in its evolution. Galaxies in dense clusters are more likely to interact with their neighbors, which can alter their shape or trigger bursts of star formation.&nbsp;



In contrast, galaxies in more isolated regions of space evolve more slowly and without as many dramatic interactions.



<h3 class="wp-block-heading" id="h-dark-matter">Dark matter</h3>



Dark matter also plays a crucial role in galaxy evolution. It provides the gravitational framework that holds galaxies together and influences their interactions with one another.&nbsp;



Supermassive <a href="https://www.earth.com/search-results/?search=Galaxies%20merge&amp;start=0" target="_blank" rel="noreferrer noopener">black holes</a>, found at the centers of most large galaxies, can also affect their evolution by releasing energy that impacts star formation and the movement of gas within the galaxy.



Overall, galaxy evolution is a complex and ongoing process driven by interactions between stars, gas, <a href="https://www.earth.com/news/study-dark-matter-does-not-exist-and-the-universe-is-27-billion-years-old/" target="_blank" rel="noreferrer noopener">dark matter</a>, and black holes, and shaped by both internal processes and external influences.



Image Credit: ESA/Hubble &amp; NASA, J. Lee



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

NGC 1792: A galactic powerhouse 

Today's Image of the Day from NASA Earth Observatory features the Fedchenko Glacier in the Pamir Mountains of Tajikistan. It is one of the world's longest glaciers outside of the polar regions.&nbsp;



“An astronaut aboard the International Space Station took this photo of glaciers in the high-elevation valleys of the Pamir Mountains of Central Asia. The upper portion of Fedchenko Glacier crosses the center of the scene.”



NASA noted that most of the larger glaciers in the image show a prominent pattern of light- and dark-brown parallel lines.&nbsp;



“The darker ‘streamlines,’ known as medial moraines, give a sense of the direction of flow of the ice down the valleys. These are concentrations of debris that has been eroded by the glacier from the adjacent mountainsides or a rocky outcrop,” said NASA.



<h2 class="wp-block-heading" id="h-fedchenko-a-high-altitude-glacier">Fedchenko: A high-altitude glacier</h2>



Fedchenko Glacier stretches for approximately 48 miles and covers an area of around 270 square miles. This massive glacier is a critical source of <a href="https://www.earth.com/news/satellites-reveal-a-sudden-drop-in-global-freshwater-levels/" target="_blank" rel="noreferrer noopener">freshwater</a>, feeding several rivers and influencing the region's hydrology.



Fedchenko Glacier lies at high altitudes, with its origins in the high peaks of the Pamirs, where snow accumulates heavily. Despite being situated in a relatively arid region, the glacier's significant size and volume are maintained by substantial snowfall.&nbsp;



Named after Alexei Pavlovich Fedchenko, a Russian explorer and naturalist, the glacier was first surveyed in 1928 during Soviet-era expeditions. It plays a crucial role in climate studies, as changes in its length and mass provide insights into the effects of global warming in Central Asia.&nbsp;



The glacier is also part of a spectacular and remote landscape, surrounded by towering <a href="https://www.earth.com/news/early-humans-preferred-the-mountains-and-it-changed-our-evolution/" target="_blank" rel="noreferrer noopener">mountains</a> and rugged terrain, making it a key feature of the Pamirs' natural beauty.&nbsp;



<h2 class="wp-block-heading" id="h-threats-to-glaciers-worldwide">Threats to glaciers worldwide</h2>



Like many glaciers worldwide, Fedchenko faces the threat of retreat due to <a href="https://www.earth.com/news/peru-has-lost-over-half-of-its-glaciers-in-six-decades/" target="_blank" rel="noreferrer noopener">global warming</a>, raising concerns about water availability and ecosystem changes in the region.



Rising global temperatures caused by greenhouse gas emissions are the primary driver of glacier melting. Warmer temperatures not only melt glacier surfaces but also increase the flow of meltwater beneath them, accelerating their disintegration.



<h3 class="wp-block-heading" id="h-human-activities-and-pollution-nbsp">Human activities and pollution&nbsp;</h3>



Deforestation and urbanization exacerbate these effects by reducing reflective snow cover and increasing heat absorption in nearby areas.&nbsp;



Airborne pollutants like soot and black carbon darken glacier surfaces, reducing their ability to reflect sunlight and speeding up the rate of melting. 



Industrial activities and tourism in glacier regions add physical stress and pollution, further degrading these fragile ecosystems.



<h3 class="wp-block-heading" id="h-water-supplies">Water supplies</h3>



The loss of glaciers has far-reaching consequences. It disrupts freshwater supplies for millions of people who depend on glacial runoff for drinking water, agriculture, and hydropower.&nbsp;



<h3 class="wp-block-heading" id="h-rising-sea-levels">Rising sea levels</h3>



<a href="https://www.earth.com/news/melting-glaciers-unleash-invasive-species-into-unexpected-areas/" target="_blank" rel="noreferrer noopener">Melting glaciers</a> contribute to rising sea levels, threatening coastal communities and ecosystems worldwide. Additionally, the loss of glaciers impacts biodiversity, as many species rely on cold, glacial habitats for survival.



<h3 class="wp-block-heading" id="h-protecting-glaciers">Protecting glaciers</h3>



Efforts to mitigate these threats focus on reducing <a href="https://www.earth.com/news/melting-glaciers-are-hidden-sources-of-greenhouse-gases/" target="_blank" rel="noreferrer noopener">greenhouse gas</a> emissions, protecting glacier regions from industrial exploitation, and promoting sustainable tourism practices.&nbsp;



However, without urgent action, the continued decline of glaciers will have profound implications for the planet's climate, water systems, and ecosystems.



<h2 class="wp-block-heading" id="h-the-pamir-mountains-nbsp">The Pamir Mountains&nbsp;</h2>



The Pamir Mountains, often called the "Roof of the World," are a vast and rugged mountain range located in Central Asia.&nbsp;



They span across Tajikistan, Afghanistan, China, and Kyrgyzstan, forming a vital part of the junction where the Himalayas, the Tian Shan, the Karakoram, the Kunlun, and the Hindu Kush converge.&nbsp;



With peaks soaring over 7,000 meters, including Ismoil Somoni Peak, the range is home to some of the highest altitudes on Earth.



The Pamir Mountains have been central to trade and cultural exchange for centuries, serving as a critical segment of the ancient Silk Road.&nbsp;



Today, the mountains are a popular destination for trekkers and explorers drawn by their breathtaking beauty and challenging terrain.



The Pamirs are not only a natural wonder but also a biological treasure trove, supporting unique wildlife that is adapted to extreme altitudes.&nbsp;



Culturally, the mountains are home to diverse communities, each with its unique traditions and ways of life, shaped by the harsh but majestic environment.



Image Credit: NASA Earth Observatory



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Fedchenko Glacier in the Pamir Mountains

Today's Image of the Day from the European Space Agency features the spiral galaxy IC 5332, which is located over 29 million light-years away from Earth.



The galaxy spans approximately 66,000 light-years in diameter. This makes it notably smaller than our <a href="https://www.earth.com/news/large-amount-of-dark-matter-may-be-missing-from-the-milky-way/" target="_blank" rel="noreferrer noopener">Milky Way</a>, which is just over 100,000 light-years in diameter. 



<h2 class="wp-block-heading" id="h-unprecedented-look-at-ic-5332">Unprecedented look at IC 5332</h2>



In a stunning photo release by NASA and ESA in 2022, the spiral galaxy IC 5332 was presented in an unprecedented level of detail. The images were captured by the <a href="https://www.earth.com/news/james-webb-captures-incredible-new-image-of-uranus/" target="_blank" rel="noreferrer noopener">James Webb Space Telescope</a>.



This feat was made possible through the use of the Mid-InfraRed Instrument (MIRI), which captures images in the mid-infrared spectrum.



<h2 class="wp-block-heading" id="h-unique-perspective-from-earth">Unique perspective from Earth</h2>



One of the most striking features of IC 5332, as revealed by these observations, is its almost perfect face-on orientation relative to Earth.&nbsp;



This unique perspective allows astronomers to clearly observe and admire the symmetrical arrangement of its spiral arms.



<h2 class="wp-block-heading" id="h-webb-unveils-ic-5332-in-new-light">Webb unveils IC 5332 in new light</h2>



The clarity of these images represents a significant advancement over previous observations made by the Hubble Space Telescope, which imaged IC 5332 in ultraviolet and visible light.&nbsp;



While Hubble’s images revealed the galaxy’s symmetrical spiral arms, James Webb’s MIRI has unveiled these structures as a complex web of gas that emits infrared light at various temperatures.



<h2 class="wp-block-heading" id="h-the-miri-instrument-on-james-webb-nbsp">The MIRI instrument on James Webb&nbsp;</h2>



Capturing this range of infrared light is no simple task. It requires highly specialized instruments that must be maintained at extremely cold temperatures.&nbsp;



The MIRI instrument on the James Webb Space Telescope is specifically designed for this purpose and performs exceptionally well. Its capabilities allow astronomers to see aspects of <a href="https://www.earth.com/news/james-webb-captures-galaxies-that-are-too-old-to-exist/" target="_blank" rel="noreferrer noopener">galaxies</a> that are otherwise hidden in other wavelengths.



The detailed images provided by MIRI offer more than just a visual spectacle; they provide valuable data about the composition and temperature of the gases that make up the spiral arms of IC 5332. 



This can help scientists understand the processes of star formation within the galaxy and how these processes compare to those in our own <a href="https://www.earth.com/news/stars-at-the-edge-of-our-milky-way-galaxy-travel-more-slowly/" target="_blank" rel="noreferrer noopener">Milky Way</a>.



<h2 class="wp-block-heading" id="h-webb-finds-hidden-features-of-the-universe-nbsp">Webb finds hidden features of the universe&nbsp;</h2>



The images of IC 5332 served as a critical test of the James Webb Space Telescope’s capabilities in observing the universe in infrared light. 



As astronomers continue to explore with Webb’s full suite of instruments, many more hidden features of the universe will be revealed.



The information provided by the <a href="https://www.earth.com/news/webb-telescope-discovers-second-most-distant-galaxy-in-pandoras-cluster/" target="_blank" rel="noreferrer noopener">James Webb Space Telescope</a> not only expands our understanding of the cosmos but also enhances our appreciation for the complex and beautiful structures that exist in our universe.&nbsp;



<h2 class="wp-block-heading" id="h-spiral-galaxies-like-ic-5332">Spiral galaxies like IC 5332</h2>



Spiral galaxies are some of the most visually striking objects in the universe, characterized by their rotating arms that extend from a central nucleus, giving them a distinct spiral appearance.&nbsp;



These galaxies are primarily made up of a flat, rotating disk containing stars, gas, and dust, and a central concentration of stars known as the bulge. These are often surrounded by a much fainter halo of stars, many of which reside in globular clusters.



Spiral galaxies differ from other galaxy types, such as elliptical and irregular galaxies, in their structure and content. 



The spiral arms are sites of ongoing star formation and are brighter than the rest of the disk because of the young, hot stars that are typically found there. The arms appear distinct because of their density waves, which compress the gas and dust, leading to star formation.



The rotation of the spiral arms also contributes to the galaxy's flat shape due to the centrifugal forces acting on the disk. The central bulge can vary in size and often contains older, red stars.&nbsp;



<h2 class="wp-block-heading" id="h-barred-spiral-galaxies-nbsp">Barred spiral galaxies&nbsp;</h2>



Some spiral galaxies have a bar-shaped structure that extends from the central bulge, making them barred spirals. This bar affects the motion of stars and gas within the galaxy and can influence star formation activity.



Spiral galaxies are an important focus of study because they contain a significant amount of visible matter and play a crucial role in understanding the formation and evolution of galaxies.&nbsp;



Their distinct features also make them particularly useful for studying the laws of physics under extreme conditions, such as high densities and velocities.



Image Credit: <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>/Webb, NASA &amp; CSA, J. Lee and the PHANGS-JWST and PHANGS-HST Teams



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Spiral galaxy IC 5332: A complex web of gas and light

Today's Image of the Day from the European Space Agency features the star-forming region NGC 604, which is located 2.73 million light-years away from Earth in the Triangulum Galaxy (M33). The image was captured by the James Webb Space Telescope.



By studying regions like NGC 604, astronomers can gain insights into the complex interactions between stars and the interstellar medium, as well as the conditions that lead to the birth of stars. This, in turn, helps in understanding the evolution of <a href="https://www.earth.com/news/galaxies-like-our-own-milky-way-are-not-unique/" target="_blank" rel="noreferrer noopener">galaxies</a> and the universe as a whole.



<h2 class="wp-block-heading" id="h-massive-stars-of-ngc-604">Massive stars of NGC 604</h2>



"Sheltered among NGC 604’s dusty envelopes of gas are more than 200 of the hottest, most massive kinds of stars, all in the early stages of their lives," said <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



"These types of stars are known as B-types and O-types, the latter of which can be more than 100 times the mass of our own Sun. It’s quite rare to find this concentration of them in the nearby universe. In fact, there’s no similar region within our own Milky Way galaxy."



According to ESA, this concentration of massive stars, combined with its relatively close distance, means NGC 604 gives astronomers an opportunity to study these objects at a fascinating time early in their life.



<h2 class="wp-block-heading" id="h-gigantic-region-of-ionized-hydrogen">Gigantic region of ionized hydrogen</h2>



NGC 604 is one of the largest known regions of ionized hydrogen, also known as an H II region. This nebula is significantly larger than the Orion Nebula, which is one of the most well-known H II regions in our own <a href="https://www.earth.com/news/large-amount-of-dark-matter-may-be-missing-from-the-milky-way/" target="_blank" rel="noreferrer noopener">Milky Way galaxy</a>.&nbsp;



NGC 604 spans about 1,500 light-years across, making it one of the largest H II regions in the Local Group of galaxies. This group includes the Milky Way, the Andromeda Galaxy, and about 54 other smaller galaxies. 



<h2 class="wp-block-heading" id="h-ngc-604-starburst-phenomenon">NGC 604 starburst phenomenon </h2>



Within NGC 604, there are hundreds of young, hot, massive <a href="https://www.earth.com/news/stars-at-the-edge-of-our-milky-way-galaxy-travel-more-slowly/" target="_blank" rel="noreferrer noopener">stars</a>. These stars have ionized the surrounding gas, causing it to glow and creating the nebula. The region is a prime example of a starburst phenomenon, where stars form at a much higher rate than in typical galactic conditions.



“The bright orange streaks in this image signify the presence of carbon-based molecules known as polycyclic aromatic hydrocarbons, or PAHs," explained ESA.



"As you travel further from the immediate cavities of dust where the star is forming, the deeper red signifies molecular hydrogen. This cooler gas is a prime environment for star formation. Ionized hydrogen from ultraviolet radiation appears as a white and blue ghostly glow."



<h2 class="wp-block-heading" id="h-more-about-star-formation">More about star formation </h2>



Star formation is crucial for the evolution of galaxies and the synthesis of heavy elements. In the cores of stars, elements heavier than helium are created.



The elements are spread throughout the <a href="https://www.earth.com/news/ancient-stars-shakti-shiva-shaped-milky-way-galaxy/" target="_blank" rel="noreferrer noopener">galaxy</a> when stars reach the end of their lives and expel their material - either gently through winds or violently via supernova explosions. This enriching process allows for the formation of new stars and planets, and ultimately, the potential for life.



<h3 class="wp-block-heading">Cloud collapse</h3>



The process begins when part of a molecular cloud becomes unstable and starts to collapse under its own gravity. This can be triggered by events like shock waves from nearby <a href="https://www.earth.com/news/supernova-explosions-could-damage-distant-planets/" target="_blank" rel="noreferrer noopener">supernovae</a>, galactic collisions, or the influence of other massive stars.



<h3 class="wp-block-heading">Formation of a protostar</h3>



As the cloud collapses, it fragments into smaller clumps. Each clump will eventually form one or more stars. 



The material within these clumps continues to fall inward, heating up as it does so, eventually forming a warm core called a protostar. At this stage, the protostar is not yet hot enough for nuclear fusion (the process that powers stars) to occur.



<h3 class="wp-block-heading">Accretion disk</h3>



Around the protostar, material from the surrounding cloud continues to fall inward, forming a rotating disk. This material slowly accretes onto the protostar, increasing its mass.



<h3 class="wp-block-heading">Nuclear fusion begins</h3>



Once the core of the protostar reaches a high enough temperature and pressure, hydrogen atoms begin to fuse into helium, releasing energy in the process. This marks the transition from a protostar to a main sequence star, like our sun.



<h3 class="wp-block-heading">Main sequence and beyond</h3>



The star will spend the majority of its life in the main sequence stage, where it balances the gravitational forces trying to collapse it and the outward pressure from nuclear fusion. 



Eventually, the star will exhaust its hydrogen fuel. Its subsequent evolution will depend on its initial mass, leading to various end stages such as red giants, supernovae, neutron stars, or black holes.



Image Credit: NASA/ESA/CSA James Webb Space Telescope



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Young, massive stars in the Triangulum Galaxy

Today's Image of the Day from NASA Earth Observatory features the Ruki River in the Democratic Republic of the Congo (DRC). It is a tributary of the Congo River, one of the largest rivers in the world by discharge and depth.&nbsp;



The Ruki River, previously known as the Busira, merges with the Momboyo River near the town of Basankusu to become the Lulonga River, which eventually flows into the Congo River at the town of Lisala.



<h2 class="wp-block-heading" id="h-dark-waters-of-the-ruki-river">Dark waters of the Ruki River</h2>



"If the appearance of the muddy Amazon River evokes a coffee cut with cream, the Ruki River, coursing gently through the Congo Basin, is like a dark tea," said <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>.



"On its slow path through mostly untouched lowland rainforest in the Democratic Republic of Congo (DRC), the water leaches organic material from vegetation, prompting some researchers to think it is one of the darkest blackwater rivers on Earth."



According to NASA, scientists are finding that the dissolved material in this distinctive water offers clues about the carbon cycle of tropical forests.



<h2 class="wp-block-heading" id="h-organic-compounds-in-the-ruki-river">Organic compounds in the Ruki River</h2>



In a recent study, researchers measured the chemical <a href="https://www.earth.com/news/warmer-rivers-keep-antimicrobial-resistant-genes-at-bay/" target="_blank" rel="noreferrer noopener">composition</a> and flow of the Ruki for the first time.&nbsp;



"The study reported that, as the water color suggests, the Ruki is rich in dissolved organic carbon compounds," said NASA.



"It contains four times as much organic carbon as the Congo River and 1.5 times as much as the Rio Negro, the world’s largest blackwater river and a major tributary of the Amazon."



Due to this heavy carbon load, the researchers concluded that tropical forests like those around the Ruki might not accumulate quite as much carbon as we once thought.



<h2 class="wp-block-heading" id="h-significance-of-the-river">Significance of the river </h2>



The river is vital for the livelihoods of local communities. <a href="https://www.earth.com/news/fishing-communities-cooperate-to-survive-climate-change/" target="_blank" rel="noreferrer noopener">Fishing</a> is a crucial activity, with many people depending on it for sustenance and income. The river also supports agriculture along its banks, where communities grow crops.



In many parts of the DRC, <a href="https://www.earth.com/news/rivers-are-warming-up-and-losing-oxygen-faster-than-oceans/" target="_blank" rel="noreferrer noopener">rivers</a> like the Ruki are crucial transportation corridors due to the challenging and often nonexistent road infrastructure. 



The river enables the movement of people and goods, facilitating trade and access to markets, health care, and education.



<h2 class="wp-block-heading" id="h-wildlife-of-the-ruki-river">Wildlife of the Ruki River </h2>



The region around the Ruki River is home to diverse wildlife. It is part of the Congo Basin, the second-largest tropical rainforest area in the world, which is a critical habitat for endangered species.



Among the most notable species are elephants and <a href="https://www.earth.com/news/study-mean-chimpanzees-fare-better-in-life-than-nice-ones/" target="_blank" rel="noreferrer noopener">chimpanzees</a>, whose populations thrive in the surrounding forests. Other primates such as bonobos also live in this region, making it a critical area for primate conservation.



The river itself is home to various species of fish that are crucial to local livelihoods. Hippopotamuses and crocodiles are often found in the water.



Birds like kingfishers, herons, and egrets frequent the riverbanks - making it a haven for birdwatchers.



The Ruki River also supports several species of reptiles and amphibians - some of which are unique to the region.



<h2 class="wp-block-heading" id="h-managing-the-river-s-resources">Managing the river's resources </h2>



The region faces several challenges, including <a href="https://www.earth.com/news/global-deforestation-directly-linked-to-atmospheric-mercury-emissions/" target="_blank" rel="noreferrer noopener">deforestation</a>, overfishing, and environmental degradation, which threaten its ecological balance and the livelihoods of people who depend on it. 



Efforts to manage and conserve the river's resources are vital for sustainable development.



Understanding and protecting the Ruki River and its surroundings are crucial for the DRC's environmental sustainability, economic development, and the well-being of its communities.



<h2 class="wp-block-heading" id="h-landscapes-of-the-drc">Landscapes of the DRC</h2>



The Democratic Republic of Congo (DRC) boasts some of the most diverse and breathtaking landscapes in Africa, reflecting its vast size and ecological richness. Dominated by the Congo Basin, the country is a haven for biodiversity.



Beyond its rainforests, the DRC's landscapes shift dramatically. In the east, the terrain rises into rugged mountains, including the Virunga and Rwenzori ranges, where snow-capped peaks like Mount Stanley pierce the sky. 



This region is also marked by active volcanoes such as Mount Nyiragongo, which harbors one of the world’s largest lava lakes, creating a dramatic and otherworldly spectacle.



To the south and west, the country transitions to expansive savannas with rolling grasslands and scattered trees. These areas contrast sharply with the lushness of the forests, providing vital habitats for species like lions and antelope. 



Rivers like the Ruki are a dominant feature, with the mighty Congo River coursing through the heart of the country. Its tributaries shape the lives of millions.



The image was captured by the OLI (Operational Land Imager) on Landsat 8.



Image Credit: NASA Earth Observatory&nbsp;



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Ruki River in the Democratic Republic of the Congo

The MODIS instrument, short for Moderate Resolution Imaging Spectroradiometer, is a key instrument aboard the Terra and Aqua satellites. MODIS is playing a vital role in the development of Earth ecosystem models, able to predict global changes, which then assist policy makers in making informed decisions about the protection of the global environment.

Heavy snow and cloud cover in the Alps are seen in this Image of the day&nbsp;from the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> and features a look at heavy snow and low clouds in the Alps. Wildlife such as ibex live in the higher peaks to elevations of 3,400 m (11,155 ft), and plants such as Edelweiss grow in rocky areas in lower elevations as well as in higher elevations.

Heavy snow and cloud cover in the Alps

Monitoring Earth Changes with MODIS

Aqua is a NASA scientific research satellite that studies precipitation, evaporation, and water cycles. Terra and Aura make up the Earth Observing System. It's the second component of the system.

A frozen Lake Erie in February Today’s Image of the Day comes from the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> and features a look at a frozen <a href="https://www.earth.com/image/icy-lake-erie/">Lake Erie</a>, which is currently 93.3 percent iced over. A frozen Lake Erie in February
This false-color image was created using data from the Moderate Resolution Imaging Spectroradiometer (MODIS) on board the Aqua satellite to differentiate between snow, ice, and clouds.
Lake Erie /ˈɪəri/ (French: Lac Érié) is the fourth-largest lake (by surface area) of the five Great Lakes in North America, and the eleventh-largest globally if measured in terms of surface area.It is the southernmost, shallowest, and smallest by volume of the Great Lakes and therefore also has the shortest average water residence time. At its deepest point Lake Erie is 210 feet (64 metres) deep. 
Situated on the International Boundary between Canada and the United States, Lake Erie&#8217;s northern shore is the Canadian province of Ontario, specifically the Ontario Peninsula, with the U.S. states of Michigan, Ohio, Pennsylvania, and New York on its western, southern, and eastern shores. These jurisdictions divide the surface area of the lake with water boundaries. 
The lake was named by the Erie people, a Native American people who lived along its southern shore. The tribal name &#8220;erie&#8221; is a shortened form of the Iroquoian word erielhonan, meaning long tail
&#8212;
By <a href="mailto:rarnold@earth.com">Rory Arnold</a>, <a href="https://www.earth.com/staff">Earth.com</a> Staff Writer
Image Credit: <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a>

A frozen Lake Erie in February

Aqua Earth Observing Satellite

This beautiful photo gallery contains 50 incredible images of Earth from Space. These images were taken by astronauts onboard the International Space Station, as well as by a multitude of NASA satellites orbiting the earth.

Today’s Image of the Day comes thanks to the <a href="https://earthobservatory.nasa.gov/IOTD/view.php?id=90654&amp;eocn=home&amp;eoci=iotd_readmore">NASA Earth Observatory</a> and features a look at Super Typhoon Noru in the Pacific Ocean just south of <a href="https://www.earth.com/news/first-blue-chrysanthemums-created/">Japan</a>.
This image was captured by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite on July 31, 2017. 
At the time the photo was taken, Typhoon Noru was located just 250 kilometers south of Iwo Jima. Maximum sustained winds hit 150 miles per hour.
The storm briefly became a category 5 on July 30, before being downgraded to a category 4 one day later.
&#8211;
By <a href="mailto:rarnold@earth.com">Rory Arnold</a>, <a href="https://www.earth.com/staff">Earth.com</a> Staff Writer
Source: <a href="https://earthobservatory.nasa.gov/IOTD/view.php?id=90654&amp;eocn=home&amp;eoci=iotd_readmore">NASA Earth Observatory</a>

Super Typhoon Noru in the Pacific Ocean

Incredible Images of Earth from Space

Photos from the International Space Station are found in this awesome Earth.com image gallery. Flat-earthers won't agree, but these incredible photos of the Earth were taken by astronauts onboard the International Space Station. The International Space Station is a modular space station in low Earth orbit.

Northern Italy from the space station is seen here in this Image of the Day from the <a href="http://www.esa.int/">European Space Agency</a> (ESA). The view includes the top half of the Italian Peninsula, along with <a href="https://www.earth.com/image/wildfires-burn-northern-corsica/">Corsica</a> and Sardinia off the coast. This image was captured by ESA astronaut Paolo Nespoli on his third and final mission to the Space Station.

Northern Italy from the Space Station

Photos from the International Space Station

Many of the world's glaciers formed during the last glacial maximum. These glaciers, remnants of the Ice Age, have persisted for thousands of years in high-altitude or polar regions.



However, there are big changes ahead. A recent study reveals that over half of the world's glaciers could disappear by the end of this century.



The research, conducted by scientists at <a href="https://ethz.ch/en.html" target="_blank" rel="noreferrer noopener">ETH Zurich</a> in Switzerland and <a href="https://www.vub.be/nl" target="_blank" rel="noreferrer noopener">Vrije Universiteit Brussel</a> in Belgium, suggests a chilling forecast for our planet's glaciers.



The scientists estimated potential <a href="https://www.earth.com/news/glacier-melt-in-alaska-is-accelerating-at-an-alarming-rate/" target="_blank" rel="noreferrer noopener">glacier loss</a> under various carbon emissions scenarios. They took into account all of our planet's glaciers - a whopping 200,000 in total.



<h2 class="wp-block-heading" id="h-glaciers-under-severe-threat">Glaciers under severe threat</h2>



The numbers from the study are daunting. Under a high emissions scenario, up to 54 percent of all glaciers could vanish. In the Alps, this number reaches an alarming 75 percent.



"Glaciers are crucial in many parts of the world, and as such, glacier changes directly impact our society and the natural environment," said study lead author and glaciologist Professor Harry Zekollari.



"Locally, glaciers can lead to natural hazards, they have an important touristic value, and they determine local water supply."



<h2 class="wp-block-heading" id="h-from-melting-glaciers-to-rising-sea-levels">From melting glaciers to rising sea levels</h2>



The melting of glaciers does not stop at the loss of an icy spectacle; the repercussions are far-reaching. One of the biggest concerns is the contribution of melting glaciers to <a href="https://www.earth.com/news/rising-sea-levels-threaten-groundwater-global-cities-underground-infrastructure/" target="_blank" rel="noreferrer noopener">rising sea levels</a>, which heighten the risk of floods in coastal towns and cities.



Moreover, glacier loss diminishes <a href="https://www.earth.com/news/satellites-reveal-a-sudden-drop-in-global-freshwater-levels/" target="_blank" rel="noreferrer noopener">freshwater</a> resources that millions of people depend on for drinking water.



"Water supply from glaciers (and how this supply changes) will impact biodiversity and water availability for industry, agriculture, and households," said Professor Zekollari.



The greenhouse effect only serves to worsen the crisis. As the Earth's <a href="https://www.earth.com/news/could-tree-planting-warm-earth-science-behind-albedo-effect/" target="_blank" rel="noreferrer noopener">albedo</a> - the ability to reflect sunlight - decreases, more energy from the sun is absorbed rather than reflected. This raises the risk of global warming, further aggravating climate change.



<h2 class="wp-block-heading" id="h-predicting-glacier-mass-loss">Predicting glacier mass loss</h2>



To estimate future glacier loss, the research team studied historical glacier masses, carbon emissions, and temperature data. 



Armed with this information and the aid of computer modeling, the experts were able to make predictions about future glacier mass loss.



"By modeling glacier evolution throughout the 21st century under various climate scenarios, we found stark differences in outcomes depending on future emission levels," noted Professor Zekollari.



Under low carbon emissions, glaciers could lose 25 to 29 percent of their mass by 2100. Under a high-emissions scenario, that figure could rise to between 46 and 54 percent.



The European Alps' glaciers are among the most vulnerable. These glaciers are predicted to lose more than 75 percent of their volume under high-emission scenarios.



However, <a href="https://www.earth.com/news/earth-polar-regions-changing-fundamental-alarming-ways/" target="_blank" rel="noreferrer noopener">polar regions</a> like Arctic Canada, Iceland, and Svalbard might retain a larger part of their glacier mass by century-end, albeit still facing significant loss.



<h2 class="wp-block-heading" id="h-uncertainties-in-glacier-evolution">Uncertainties in glacier evolution</h2>



Despite these painful revelations, the team acknowledges uncertainties in the projected glacier evolution, while stressing that the research specifically examined glaciers, not ice sheets.



Ice sheets, the gargantuan masses of glacial ice found on Greenland and Antarctica, carry about 99 percent of Earth's freshwater.



While these ice sheets hold greater mass and react on longer timescales, their contribution to sea-level rise is about the same (or even slightly less) than from the 200,000 glaciers under study.



"For us it is indeed the crucial that all numbers by us and other researchers are combined to get the full sea-level rise picture," concluded Professor Zekollari.



The fragility of our world's glaciers highlights the pressing need for proactive climate action. 



<h2 class="wp-block-heading" id="h-preserving-glaciers-a-collective-responsibility">Preserving glaciers: A collective responsibility</h2>



The fate of the world's glaciers is not set in stone. By reducing carbon emissions and implementing sustainable environmental policies, it is possible to slow their decline. 



Efforts like transitioning to renewable energy, protecting vulnerable ecosystems, and raising global awareness about the importance of glaciers can help mitigate their loss. 



Every action we take today helps protect glaciers for future generations, ensuring the preservation of freshwater resources, biodiversity, and the delicate balance of our climate.



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.earth.com/author/eralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Over half of the world’s glaciers are on pace to disappear by 2100

Many of the world's glaciers formed during the last glacial...

A galaxy racing through space at an astonishing speed of two million mph (3.2 million km/h) has created a dramatic collision, observed in unprecedented detail by one of Earth’s most advanced telescopes.&nbsp;



The event occurred in <a href="https://www.earth.com/image/stephans-quintet-in-unprecedented-detail/" target="_blank" rel="noreferrer noopener">Stephan’s Quintet</a>, a well-known group of five interacting galaxies first discovered nearly 150 years ago. 



The collision unleashed a powerful shockwave described as being akin to a “sonic boom from a jet fighter,” showcasing one of the Universe's most striking phenomena.



The galaxy responsible, NGC 7318b, passed through Stephan’s Quintet, triggering the reactivation of a chaotic field of debris left behind by previous <a href="https://www.earth.com/news/galaxy-collisions-hubble-spots-a-string-of-pearls-star-cluster/" target="_blank" rel="noreferrer noopener">galactic collisions</a>.&nbsp;



This rare event was captured by the William Herschel Telescope Enhanced Area Velocity Explorer (WEAVE), a state-of-the-art spectrograph located in La Palma, Spain.



<h2 class="wp-block-heading" id="h-stephan-s-quintet-a-galactic-crossroad">Stephan’s Quintet: A galactic crossroad</h2>



“Since its discovery in 1877, Stephan’s Quintet has captivated astronomers because it represents a galactic crossroad where past collisions between galaxies have left behind a complex field of debris,” explained lead author Marina Arnaudova, an astronomer at the <a href="https://www.herts.ac.uk/" target="_blank" rel="noreferrer noopener">University of Hertfordshire</a>.&nbsp;



“Dynamical activity in this galaxy group has now been reawakened by a galaxy smashing through it at an incredible speed of over two million mph, leading to an immensely powerful shock, much like a sonic boom from a jet fighter.”



This new insight into Stephan’s Quintet was achieved using WEAVE’s Large Integral Field Unit (LIFU), part of a €20-million (£16.7-million) next-generation science facility.&nbsp;



WEAVE’s capabilities allow astronomers to explore the composition and behavior of stars and gasses within galaxies, offering unprecedented detail about the dynamics of galactic interactions.



<h2 class="wp-block-heading" id="h-the-dual-nature-of-the-shockwave">The dual nature of the shockwave</h2>



One of the study’s most significant findings was the dual nature of the shockwave produced by the collision.&nbsp;



“As the shock moves through pockets of cold gas, it travels at hypersonic speeds - several times the speed of sound in the intergalactic medium of Stephan’s Quintet - powerful enough to rip apart electrons from atoms, leaving behind a glowing trail of charged gas, as seen with WEAVE,” Arnaudova said.



However, the shock behaves differently when it interacts with surrounding hot gas.&nbsp;



“Instead of causing significant disruption, the weak shock compresses the hot gas, resulting in <a href="https://www.earth.com/news/earths-radio-waves-recorded-from-the-moon-for-the-first-time/" target="_blank" rel="noreferrer noopener">radio waves</a> that are picked up by radio telescopes like the Low Frequency Array (LOFAR),” explained Soumyadeep Das, a PhD student at the University of Hertfordshire.



<h2 class="wp-block-heading" id="h-advanced-instruments-unlock-new-insights">Advanced instruments unlock new insights</h2>



The detailed observations combined data from WEAVE with those from other cutting-edge instruments, including LOFAR, the Very Large Array (VLA), and the James Webb Space Telescope (JWST). 



WEAVE, which is attached to the William Herschel Telescope, analyzes light from stars and gas through spectroscopy. 



<figure class="wp-block-image aligncenter size-full is-resized"><a href="https://www.earth.com/wp-content/uploads/2024/11/galaxy-collision_Stephans-Quintet_2-million-mph_UHertfordshire_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/11/galaxy-collision_Stephans-Quintet_2-million-mph_UHertfordshire_1s.webp" alt="WEAVE data overlaid on a James Webb Space Telescope image of Stephan's Quintet, with green contours showing radio data from the Low Frequency Array (LOFAR) radio telescope. The orange and blue colors follow the brightness of Hydrogen-alpha obtained with the WEAVE LIFU, which trace where the intergalactic gas is ionized. Credit: University of Hertfordshire" class="wp-image-1951174" style="width:300px;height:auto"/></a><figcaption class="wp-element-caption">WEAVE data overlaid on a James Webb Space Telescope image of Stephan's Quintet, with green contours showing radio data from the Low Frequency Array (LOFAR) radio telescope. The orange and blue colors follow the brightness of Hydrogen-alpha obtained with the WEAVE LIFU, which trace where the intergalactic gas is ionized. Credit: University of Hertfordshire</figcaption></figure>



This process reveals a “bar code” of colors that uncovers the elements present in <a href="https://www.earth.com/news/white-dwarf-stars-may-be-billions-of-years-older-than-estimated/" target="_blank" rel="noreferrer noopener">stars</a>, providing crucial information about galactic composition and behavior.



This advanced spectrograph was developed through an international partnership involving France, Italy, Spain, the Netherlands, and the UK. 



Its primary mission is to provide groundbreaking insights into the formation of the Milky Way and other galaxies, as well as the evolution of the Universe.



<h2 class="wp-block-heading" id="h-a-glimpse-into-galactic-evolution">A glimpse into galactic evolution</h2>



Stephan’s Quintet offers a unique laboratory for understanding the violent interactions between galaxies.&nbsp;



Professor Gavin Dalton is the WEAVE principal investigator at RAL Space and the University of Oxford.



“The shock and the unfolding collision that we see in Stephan’s Quintet provide a remarkable perspective on what may be happening in the formation and evolution of the barely resolved faint galaxies that we see at the limits of our current capabilities,” said Dalton.&nbsp;



“It’s really neat work that Marina has put together with this large team, but this first WEAVE science paper also represents just a taste of what is to come over the next five years now that WEAVE is becoming fully operational,” added Daniel Smith of the University of Hertfordshire.



<h2 class="wp-block-heading" id="h-a-promising-future-for-galactic-research">A promising future for galactic research</h2>



The findings mark an exciting beginning for WEAVE’s role in astronomy.&nbsp;



“I’m excited to see that the data gathered at the WEAVE first light already provide a high-impact result, and I’m sure this is just an early example of the types of discoveries that will be made possible with WEAVE on the William Herschel Telescope in the coming years,” said Marc Balcells, director of the Isaac Newton Group of Telescopes.



By capturing the details of this dramatic galactic collision, WEAVE has demonstrated its potential to revolutionize our understanding of the cosmos.&nbsp;



With its ability to analyze light from stars and gasses with unprecedented speed and accuracy, the spectrograph is set to uncover more insights into <a href="https://www.earth.com/news/early-galaxy-formation-occurred-much-faster-than-we-thought/" target="_blank" rel="noreferrer noopener">galaxy formation</a>, evolution, and the chaotic interactions shaping the Universe.



Image Credit: University of Hertfordshire



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Galaxies colliding at 2 million miles per hour observed in unprecedented detail

A galaxy racing through space at an astonishing speed of...

Scientists have been scratching their heads about the purpose of the ultrasonic vocalizations (USVs) made by rodents since these sounds were first discovered in the 1950s.



A widely accepted theory suggests a role in social communication, and paints a picture of rodents using these sounds to attract mates.



<h2 class="wp-block-heading" id="h-rodents-and-ultrasonic-vocalizations">Rodents and ultrasonic vocalizations</h2>



Dr. Eduardo Mercado III, a professor of psychology at the University of Buffalo <a href="https://arts-sciences.buffalo.edu" target="_blank" rel="noreferrer noopener">College of Arts and Sciences</a>, proposes a fresh perspective on rodents' USVs. 



According to Dr. Mercado, when rodents make these <a href="https://www.earth.com/news/ultrasound-waves-can-enhance-mindfulness-and-brain-health/" target="_blank" rel="noreferrer noopener">sounds</a>, the aim isn't romance, but something else entirely. 



"This phenomenon has never been observed before, or I believe even suspected, in any animal," said Dr. Mercado. 



"They're creating new pathways of information by manipulating their environment and controlling the molecular interactions of particles around them."



This radical idea could carry broad implications, possibly leading to innovative treatments for psychological disorders and advancements in technology.



One might even imagine these clever rodents as having Jedi skills, as Mercado humorously suggests. It is almost as if they practice a form of "magic," manipulating their environment to their advantage.



<h2 class="wp-block-heading" id="h-a-discovery-inspired-by-whale-songs">A discovery inspired by whale songs</h2>



Dr. Mercado's background in the study of humpback whale songs led to his revolutionary hypothesis.



While attending a meeting on ultrasonic vocalizations, he recognized certain inconsistencies in rodent behavior that didn't quite align with the prevalent thought on the purpose of USVs.



Rodents explore their environment using their whiskers, visual scans, and incessant sniffing. 



Interestingly, Dr. Mercado found that studies which monitored sniffing alongside vocalizations showed that rodents would immediately sniff the air after producing each USV.



Could it be that these two actions are interconnected?



<h2 class="wp-block-heading" id="h-how-rats-might-use-ultrasonic-sounds">How rats might use ultrasonic sounds</h2>



Vibroacoustics, a field concerned with <a href="https://www.earth.com/news/zapping-the-brain-with-ultrasound-waves-may-cure-drug-addiction/" target="_blank" rel="noreferrer noopener">ultrasonic</a> vibrations, uses sound to manipulate particle clusters.



Drawing parallels, Dr. Mercado suggests that rodents might be using their ultrasonic vocalizations to create odor clusters in the air, thereby enhancing their ability to detect airborne chemicals, such as pheromones.



"That could be a coincidence, or it might suggest the two are functionally related," said Dr. Mercado. 



"I knew that techniques for using ultrasound to manipulate particles are used in the field of vibroacoustics and thought immediately that might also work for animals."



In rodents, this manipulation would make it easier for individuals to detect and identify others within their social sphere - distinguishing friends from strangers and competitors with better precision.



This implies that by vocalizing through ultrasonic sounds, rats are helping themselves to smell odors in their environment.



<h2 class="wp-block-heading" id="h-implications-for-human-health">Implications for human health</h2>



Rodent vocalizations have helped in the study of human disorders related to <a href="https://www.earth.com/news/how-ermine-moths-effortlessly-produce-ultrasonic-warning-sounds/" target="_blank" rel="noreferrer noopener">communication</a>, emotional processing, and social behavior.



The understanding of conditions such as anxiety, depression, schizophrenia, Parkinson's disease, and autism has advanced due to the results from studies of rodent vocalizations.



"Rodents are at the forefront of biological research," said study co-author Jessica Zhou, a student researcher at <a href="https://www.harvard.edu" target="_blank" rel="noreferrer noopener">Harvard University</a>. "Rodents, especially rats and mice, are the unsung heroes of the scientific world."



Their contributions to biological research could widen if this intriguing hypothesis holds true.



<h2 class="wp-block-heading" id="h-evolution-of-complex-cognitive-processes">Evolution of complex cognitive processes </h2>



An interesting evolutionary perspective illustrates how the sense of smell, used for exploration, has driven the evolution of more complex cognitive processes, including attention and memory. 



A deeper understanding of this system might provide insights into the evolution of these crucial cognitive functions.



While the potential uses of rodent <a href="https://www.earth.com/news/ultrasound-helps-save-sea-turtles-from-fishing-nets/" target="_blank" rel="noreferrer noopener">USVs</a> in scientific research is significant, several challenges must be addressed to harness their benefits fully.



Rigorous experimental designs are necessary to test Dr. Mercado’s hypothesis empirically across various rodent species and environmental conditions.



Moreover, advancements in acoustic technology could enhance our ability to capture and analyze these ultrasonic frequencies with greater precision. 



<h2 class="wp-block-heading" id="h-rats-sounds-and-new-innovations">Rats, sounds, and new innovations</h2>



The journey ahead requires an open mind and a commitment to innovation. 



The next few years could prove pivotal in confirming whether rodents truly manipulate their chemical environments or if another unknown factor is at play.



Understanding this process could inform the development of new technologies. 



Drawing a parallel to how understanding vision in nocturnal animals led to the development of night-vision goggles, the authors propose that recognizing the reasons for rodents' intriguing use of sound might pave the way for sonic-manipulation technologies involving nanoparticles.



The study is published in the journal <a href="https://www.sciencedirect.com/science/article/abs/pii/S0149763424003774?via%3Dihub" target="_blank" rel="noreferrer noopener">Neuroscience &amp; Biobehavioral Reviews.</a>



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.earth.com/author/eralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Rats have a "magical" ability to move matter using soundwaves

Scientists have been scratching their heads about the purpose of...

History is filled with mysterious artifacts, and the Aztec death whistle is an intriguing example.



Imagine a musical instrument with the sound of a terrifying, blood-curdling scream. This unusual whistle had a place in the fascinating world of the Aztec civilization during the pre-Columbian era in Mesoamerica.



This rich cultural context presents a labyrinth of mythology that is steeped in fearsome deities and chilling rituals – many of which may have employed this eerie instrument to good effect.



The death whistle's skull-shaped design is believed to symbolize Mictlantecuhtli, the fearsome Lord of the Aztec Underworld. 



The instrument's chilling sound may have served as a sorrowful fanfare preceding human sacrifices, at a time when the victims were being prepared for their mythical descent into Mictlan, the gloomy realm of the afterlife.



<h2 class="wp-block-heading" id="h-unique-mechanics-of-the-aztec-death-whistle">Unique mechanics of the Aztec death whistle</h2>



Of course, such startling audial experiences pique the curiosity of scientists. 



So it's no surprise that a team of researchers ventured into the history-laden world of <a href="https://www.earth.com/news/aztecs-kept-accurate-time-using-the-sun-and-the-mountains/" target="_blank" rel="noreferrer noopener">Aztec</a> musical instruments, keen to unravel the secrets of the death whistle's unique sonic properties. 



The research was conducted at the <a href="https://www.uzh.ch/en.html" target="_blank" rel="noreferrer noopener">University of Zurich</a>, and was led by Sascha Frühholz, professor of cognitive and affective neuroscience.



The researchers embarked on their exploration using 3D digital reconstructions of original Aztec death whistles, sourced from the Ethnological Museum in Berlin.



What they discovered was a wholly peculiar internal construction that featured two opposing sound chambers able to create physical air turbulence as the source of the screeching sound.



“The whistles have a very unique construction, and we don’t know of any comparable musical instrument from other pre-Columbian cultures or from other historical and contemporary context,” noted Frühholz.



<h2 class="wp-block-heading" id="h-the-emotive-impact-of-the-death-whistle">The emotive impact of the death whistle</h2>



Undeniably, the chilling whistle of <a href="https://www.earth.com/news/third-state-of-existence-beyond-life-and-death-confirmed-by-scientists/" target="_blank" rel="noreferrer noopener">death</a> is one of a kind. But what makes it so terrifying? 



To answer this, the Swiss research team gathered sound recordings of people blowing original Aztec death whistles, and compared them to those blowing handmade replicas.



When played back, listeners described the sounds as extremely chilling and frightening.



<div class="wp-block-sendtonews-playerselector">[sendtonews key="LrUGbnrmsd-4049652-12187" type="single"]</div>



According to the research analysis, the Aztec death whistle seems to mimic other deterring and fearsome sounds, both acoustically and affectively.



Intriguingly, human listeners perceived the whistle's sound to be partly organic and natural, like a human voice or scream. 



“This is consistent with the tradition of many <a href="https://www.earth.com/news/humans-started-cumulative-culture-around-600000-years-ago/" target="_blank" rel="noreferrer noopener">ancient cultures</a> to capture natural sounds in musical instruments, and could explain the ritual dimension of the death whistle sound for mimicking mythological entities,” said Frühholz.



<h2 class="wp-block-heading" id="h-psychological-responses-to-the-death-whistle">Psychological responses to the death whistle</h2>



Digging deeper into the human reaction to the mysterious instrument, brain recordings were made while listeners were exposed to the whistle's sounds.



The results showed significant response in the regions belonging to the affective neural system, highlighting the eerie and sinister nature of the sound.



Moreover, the team observed brain activity in regions that associate sounds with symbolic meaning, suggesting that the death whistle combines both affective influence and complex mental processes of sound symbolism.



<h2 class="wp-block-heading" id="h-linking-modern-minds-to-ancient-aztec-audiences">Linking modern minds to ancient Aztec audiences</h2>



The power of music to stir emotions has been recognized across cultures and eras. 



Similarly, the Aztec communities may have utilized the death whistle's symbolic and unnerving properties during their <a href="https://www.earth.com/news/stone-age-humans-from-magdalenian-culture-practiced-cannibalism-as-part-of-funeral-rituals/" target="_blank" rel="noreferrer noopener">ritual</a> ceremonies. 



They may have capitalized on the fear and awe inspired by the whistle to sway the audience's emotional state.



“Unfortunately, we could not perform our psychological and neuroscientific experiments with humans from ancient Aztec cultures. But the basic mechanisms of affective response to scary sounds are common to humans from all historical contexts,” said Frühholz.



<h2 class="wp-block-heading" id="h-using-sounds-to-evoke-emotions">Using sounds to evoke emotions</h2>



The Aztec death whistle offers a fascinating glimpse into how ancient cultures harnessed sound to evoke emotions and communicate profound ideas. Its chilling resonance reminds us of the universal power of sound to influence human psychology.



Modern studies on the death whistle's acoustic properties highlight its ability to mimic organic sounds, such as screams, which are universally recognized as distress signals.



This unique feature has opened doors for contemporary researchers to explore parallels between ancient instruments and the science of <a href="https://www.earth.com/news/sounds-can-change-the-way-we-see-things/" target="_blank" rel="noreferrer noopener">sound perception</a>. 



For instance, understanding how the whistle triggers fear and awe in listeners provides insight into how humans react to auditory cues in both natural and artificial environments. 



These findings have applications in fields ranging from neuroscience to sound design, demonstrating the enduring relevance of this ancient artifact.



The Aztec death whistle’s haunting legacy not only sheds light on the creativity of the Aztec civilization but also challenges us to consider the cultural significance of sound in shaping human experience across history.



The study is published in the journal <a href="https://www.nature.com/articles/s44271-024-00157-7" target="_blank" rel="noreferrer noopener">Communications Psychology</a>.



Image Credit: Sascha Frühholz



Video Credit: University of Zurich 



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.earth.com/author/eralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Secrets of the Aztec death whistle's terrifying sound

History is filled with mysterious artifacts, and the Aztec death...

Coal ash is the chalky leftovers from a fuel that's been our mainstay for centuries. Now, it's something of a hot issue, considering that it's been accumulating across the nation for decades. 



A new study, led by researchers from The University of Texas at Austin, unearthed a hidden treasure in these mounds of ash – a large supply of rare-earth elements that could significantly beef up the national supply and reduce the need for new mining operations.



<h2 class="wp-block-heading" id="h-from-trash-to-treasure">From trash to treasure</h2>



“This really exemplifies the ‘trash to treasure’ mantra,” said co-lead author Bridget Scanlon, a research professor at UT’s Bureau of Economic Geology at the Jackson School of Geosciences. 



“We’re basically trying to close the cycle and use waste and recover <a href="https://www.earth.com/news/global-co2-emissions-rise-as-nations-tackle-fossil-fuel-dependence/" target="_blank" rel="noreferrer noopener">resources</a> in the waste, while at the same time reducing environmental impacts.”



Rare-earth elements, a group of 17 pivotal chemical soldiers, are the backbone of our modern tech-dependent world. These unseen heroes also play a critical part in our energy transition towards lower carbon fuels, as they are used in solar panels, batteries, magnets and a host of other energy technologies.



<h2 class="wp-block-heading" id="h-rare-earth-dilemma">Rare-earth dilemma</h2>



The United States is heavily dependent on imports - about 75% - for these strategic elements, and most of it is from China. It's a risky situation, given the convoluted labyrinth of global supply chains and rising geopolitical tensions.



But UT Austin's trailblazing study provides a ray of hope. A whopping 11 million tons of <a href="https://www.earth.com/news/crucial-rare-earth-elements-discovered-coal-mines-united-states/" target="_blank" rel="noreferrer noopener">rare-earth elements</a> could be up for grabs in easily accessible coal ash piles; this represents nearly eight times the amount currently hoarded in U.S. domestic reserves.



This study, the first to take stock of our national coal ash resources, estimates that $8.4 billion worth of these elements could be unearthed from this accessible coal ash treasure.



Moreover, the U.S. Department of Energy is keen to apply this new methodology to conduct its own assessment of national coal ash resources.



<h2 class="wp-block-heading" id="h-building-value-from-coal-ash">Building value from coal ash</h2>



Though the levels of rare earth elements in coal ash are low compared to traditional geological sources, the sheer volume of readily available coal ash makes it a promising <a href="https://www.earth.com/news/natural-gas-isnt-as-clean-as-we-think/" target="_blank" rel="noreferrer noopener">resource</a>. 



“There’s huge volumes of this stuff all over the country. And the upfront process of extracting the (mineral host) is already taken care of for us,” said co-author Davin Bagdonas, a research scientist at the University of Wyoming.



The scientists discovered that from 1985 to 2021, nearly 70% of coal ash produced, amounting to 1,873 million tons, could potentially be recovered.



This ash is largely stored in landfills, ponds, and offsite storage areas. The rest has been sold off and put to use by other industries, such as in cement production and road construction.



<h2 class="wp-block-heading" id="h-coal-ash-origin-affects-the-content">Coal ash origin affects the content</h2>



The coal ash's place of origin impacts the concentration of rare-earth elements it contains, and the quantity that can be extracted.



Ashes from Appalachian Basin coal contain the highest amounts of rare-earth elements (an average of 431 milligrams per kilogram), but only about 30% of it can be extracted.



On the other hand, coal from the Powder River Basin has a lower average rare-earth content (264 milligrams per kilogram), but nearly 70% of it can be extracted.



<h2 class="wp-block-heading" id="h-implementing-the-strategy">Implementing the strategy</h2>



Chris Young, the Chief Strategy Officer at Element USA, a company that extracts critical <a href="https://www.earth.com/news/plant-based-jet-fuel-could-revolutionize-aviation/" target="_blank" rel="noreferrer noopener">minerals</a> from waste, sees this new research as further proof of coal ash's potential. 



“The idea of getting rare-earth elements out of tailings (mining by-products) just makes a lot of sense. It’s a common-sense approach,” he said. “The challenge is to convert that common-sense approach to an economic approach.”



The study's promising results have sparked a surge in industry interest. Element USA is moving its analytical lab and pilot equipment to Austin to leverage the mineral expertise at <a href="https://www.utexas.edu" target="_blank" rel="noreferrer noopener">The University of Texas</a> and provide students with hands-on experience in critical mineral research and careers.



The funding for this research was raised by the U.S. Department of Energy's Office of Fossil Energy and Carbon Management, and the Jackson School of Geosciences.



The study's other co-authors include Robert Reedy, J. Richard Kyle, and Kristine Uhlman from the Bureau, James Hower from the <a href="https://www.uky.edu" target="_blank" rel="noreferrer noopener">University of Kentucky</a>, and independent consultant Dennis James.



The research is published in the <a href="https://link.springer.com/article/10.1007/s40789-024-00710-z">International Journal of Coal Science &amp; Technology</a>.



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.earth.com/author/eralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

U.S. coal ash holds tons of rare-earth elements worth $8.4 billion

Coal ash is the chalky leftovers from a fuel that's...

Sipping on a citrus soda, have you ever wondered why the flavor seemed to be evenly distributed? A secret ingredient played a big role.



However, after much consideration and several studies indicating potential health risks, this soda additive is nearing its end in the United States.



<h2 class="wp-block-heading" id="h-banning-the-soda-additive">Banning the soda additive </h2>



The Food and Drug Administration (<a href="https://www.fda.gov" target="_blank" rel="noreferrer noopener">FDA</a>), America's federal agency for regulating <a href="https://www.earth.com/news/electronic-tongue-could-revolutionize-food-safety/" target="_blank" rel="noreferrer noopener">food safety</a>, has recently taken a decisive step against this controversial soda ingredient called BVO, or brominated vegetable oil.



After revoking the registration of BVO, this modified vegetable oil is now officially banned across the country.



The decision came after clear evidence of toxicity emerged from recent studies, making the continued usage of BVO untenable.



James Jones, FDA deputy commissioner for humans foods, announced the significant proposal.



"The proposed action is an example of how the agency monitors emerging evidence and, as needed, conducts scientific research to investigate safety-related questions, and takes regulatory action when the science does not support the continued safe use of <a href="https://www.earth.com/news/hundreds-of-ingredients-in-u-s-foods-are-potentially-unsafe/" target="_blank" rel="noreferrer noopener">additives</a> in foods," noted Jones. 



<h2 class="wp-block-heading" id="h-questioning-the-safety-of-the-soda-additive">Questioning the safety of the soda additive</h2>



The story of BVO dates back to the 1930s. As an emulsifying agent, it was added to keep the citrus flavor from floating to the top of soda. 



Animal studies have suggested that the compound may slowly accumulate in our <a href="https://www.earth.com/news/eating-late-increases-hunger-and-changes-fat-tissues/" target="_blank" rel="noreferrer noopener">fat tissues</a>, preventing iodine from performing crucial functions within our thyroid gland. 



This led health authorities worldwide to question the emulsifier's safety.



In fact, BVO has already been scrapped from the ingredients list in several countries, including India, Japan, and European Union nations. 



Even the state of California bid it farewell in October 2022, with the ban expected to be active by 2027.



<h2 class="wp-block-heading" id="h-concerns-about-potential-toxicity">Concerns about potential toxicity </h2>



The FDA had its reservations. In the 1950s, it considered BVO a generally recognized as safe (GRAS) ingredient. 



This status was given to items that had either been adequately tested or to those in common use prior to 1958.



The perception changed in the next decade when concerns about potential toxicity arose, leading to a temporary limit on BVO usage, especially in citrus <a href="https://www.earth.com/news/elevated-levels-of-toxic-metals-detected-in-popular-drinks/" target="_blank" rel="noreferrer noopener">drinks</a>.



Getting hard data on the long-term risks was not an easy task, hence the delay. 



However, research in the UK during the 1970s found bromine building up in human tissues, and its high concentrations were linked to heart and behavioral issues in animals.



<h2 class="wp-block-heading" id="h-what-exactly-is-gras">What exactly is GRAS?</h2>



Generally Recognized as Safe, or GRAS, is a designation used by the U.S. FDA to indicate that a substance added to food is <a href="https://www.earth.com/news/toxic-chemicals-from-food-production-pass-into-the-human-body/" target="_blank" rel="noreferrer noopener">considered safe</a> by experts. 



Basically, if something is labeled as GRAS, it means that scientists and researchers agree it won’t harm you when used as intended in our food. 



This can include everyday ingredients like salt, <a href="https://www.earth.com/news/ultra-processed-foods-are-harmful-to-nearly-every-part-of-the-body/" target="_blank" rel="noreferrer noopener">certain preservatives</a>, and natural flavorings that have been used for years without any known issues. 



The GRAS status can be based on a long history of common use in food or on scientific evidence showing that the substance is safe.



Companies can declare their ingredients as GRAS either by <a href="https://www.earth.com/news/electronic-tongue-could-revolutionize-food-safety/" target="_blank" rel="noreferrer noopener">conducting their own research</a> or by relying on the collective knowledge of experts. They can also submit their GRAS determinations to the FDA for review, but it's not always required. 



This system helps streamline the process of getting safe additives into the food supply without the need for lengthy approval procedures for every single ingredient. 



Overall, GRAS plays a crucial role in ensuring that the additives in our food are safe to eat, giving consumers confidence in the products they choose.



<h2 class="wp-block-heading" id="h-soda-makers-move-on">Soda makers move on</h2>



After several studies, the FDA is finally convinced that BVO should be banned. Companies such as PepsiCo and Coca-Cola Co. have already started the process of phasing out this ingredient from their products over the last decade.



"Over the years many <a href="https://www.earth.com/news/children-are-consuming-more-sugary-drinks-than-ever/" target="_blank" rel="noreferrer noopener">beverage</a> makers reformulated their products to replace BVO with an alternative ingredient, and today, few beverages in the US contain BVO," said Jones. 



This decision could be the first of many. The FDA is currently reviewing regulations authorizing certain food additives, aiming to enhance the process and prohibit food coloring agents found to cause cancer in humans or animals.



The final decision on BVO's classification went through a comprehensive review process that has now come to an end. With alternatives already being used globally to keep citrus drinks tangy to the last drop, it appears the days of BVO are truly numbered.



<h2 class="wp-block-heading" id="h-the-future-of-soda-ingredients">The future of soda ingredients</h2>



With BVO officially banned, soda manufacturers are now turning to safer and more sustainable alternatives to maintain flavor consistency in citrus beverages. 



Common replacements include natural stabilizers such as ester gum and sucrose acetate isobutyrate (SAIB), which offer similar emulsifying properties without the associated health risks.



This shift reflects a broader trend in the beverage industry toward cleaner labels and transparency in ingredient sourcing. 



As consumers become more health-conscious, brands are under increasing pressure to minimize the use of synthetic additives and embrace natural formulations.



In addition, regulatory bodies are expected to intensify their scrutiny of food and beverage ingredients, encouraging innovation in the development of safe and effective stabilizers. 



These advancements could pave the way for a new era of beverages that prioritize both taste and health.



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.earth.com/author/eralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Controversial soda additive has been banned by the FDA

Sipping on a citrus soda, have you ever wondered why...

Astronomers have discovered a planet that is just 3 million years old - a baby in planetary terms. Named IRAS 04125+2902 b, it is the youngest planet discovered using conventional detection methodologies.



The planet was spotted by a team of scientists led by Madyson G. Barber, a graduate student at the <a href="https://search.app?link=https%3A%2F%2Fwww.unc.edu%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">University of North Carolina at Chapel Hill</a>.



To understand the location of the newborn planet, we must take a metaphorical journey 430 light-years away to the Taurus Molecular Cloud. This is an active stellar nursery housing hundreds of newborn stars, making it a prime target for astronomers. 



According to the researchers, the <a href="https://www.earth.com/news/thousands-of-worlds-do-not-fit-the-definition-of-a-planet/" target="_blank" rel="noreferrer noopener">young world</a> is still glowing from to the heat of its formation, as it continues to evolve.



<h2 class="wp-block-heading" id="h-young-planets-are-usually-hidden">Young planets are usually hidden</h2>



The Taurus Molecular Cloud provides important information about the formation and evolution of young stars. However, when it comes to the planets in this stellar nursery, it's like trying to read a closed book.



Instruments like the Transiting Exoplanet Survey Satellite (<a href="https://exoplanets.nasa.gov/tess/" target="_blank" rel="noreferrer noopener">TESS</a>), which work on the transit method, depend on a clear line of sight to detect planets. 



These telescopes watch for the dip in starlight when a planet crosses the face of its host star. But when there are obstructive debris disks, potentially transiting planets remain hidden.



<h2 class="wp-block-heading" id="h-lucky-discovery-of-a-newborn-planet">Lucky discovery of a newborn planet</h2>



In a fortunate turn of events, the outer debris disk encircling the planet is warped, making the young world visible to TESS.



But why did this warp happen? The planet just may have moved closer to its star, causing it to diverge from the outer disk's orientation.



From Earth, we see an edge-on planet's orbit, while the outer disk appears face-on. But for this to happen, another (quite large) object would be needed in the system, and we haven't detected one yet.



<h2 class="wp-block-heading" id="h-stellar-companion-friend-or-foe">Stellar companion: Friend or foe?</h2>



The system's sun has a distant stellar companion, which could be causing the warping. However, the orbit of this companion aligns with the planet and its parent star.



Normally, this alignment should push the disk closer to the system, not away from it. So, this doesn't quite explain the warp.



Another possibility involves no companion star at all. Busy stellar nurseries like the Taurus Molecular Cloud can cause disk warping through "rains" of infalling material. Right now, it's unclear whether such warped or broken disks are common occurrences or not.



<h2 class="wp-block-heading" id="h-possibly-a-mini-neptune-or-super-earth">Possibly a mini-Neptune or super-Earth </h2>



By coupling TESS’s transit measurements with the wobble method, the scientists learned more about the newborn planet. This method detects changes in starlight due to the gravitational tug of the planet on its star.



The planet’s mass is about a third of Jupiter's, but it has a similar diameter. This implies a lower density and, likely, an enlarged atmosphere.



It could turn out to be a "mini-Neptune" or a rocky "<a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fsuper-earth-discovered-in-the-habitable-zone-of-its-star%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">super-Earth</a>'," which are both common in the Milky Way even though they are not found in our solar system.



<h2 class="wp-block-heading" id="h-implications-for-planetary-formation">Implications for planetary formation</h2>



The observation of IRAS 04125+2902 b offers invaluable insights into our understanding of planetary formation and migration. 



The unique circumstances surrounding this planet, particularly the potential disk warping and near-proximity transit observability, challenge existing theoretical models. 



Traditional views suggest that planet migration occurs gradually, influenced by the dynamics of the protoplanetary disk. However, the observed warp indicates that external forces or rapid inward migration could play more substantial roles than previously assumed.



This discovery prompts astronomers to re-evaluate how planets can universally evolve within various environmental conditions, pushing forward our comprehension of complex planetary systems.



<h2 class="wp-block-heading" id="h-future-observations-of-the-young-planet">Future observations of the young planet</h2>



The unusual characteristics of IRAS 04125+2902 b make it a top candidate for further investigation. Future missions equipped with advanced telescopic technology could help elucidate the dynamics of its environment and uncover the nature of any potential nearby objects affecting the disk's structure. 



For instance, next-generation telescopes with higher resolution could capture more detailed images, offering a clearer understanding of the disk’s orientation and any perturbing influences. 



Additionally, comparing IRAS 04125+2902 b with other young exoplanets in similar stellar nurseries could help experts determine whether such planet-disk interactions are extraordinary or prevalent in the cosmos.



Continued observation will be crucial in exploring these enigmatic circumstances and advancing our knowledge of early <a href="https://www.earth.com/news/most-of-earths-safe-planetary-boundaries-have-been-breached/" target="_blank" rel="noreferrer noopener">planetary evolution</a>.



The research is published in the journal <a href="https://search.app?link=https%3A%2F%2Fwww.nature.com%2Farticles%2Fs41586-024-08123-3&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">Nature</a>.



Image Credit: NASA/JPL-Caltech/R. Hurt, K. Miller (Caltech/IPAC)



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.earth.com/author/eralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

'Newborn' planet is still glowing from the heat of its formation

Astronomers have discovered a planet that is just 3 million...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="0ynNMYkMKa-2340414-12187" type="single"]</div>



Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



---



By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Nushagak Bay in southwest Alaska

[sendtonews key="0ynNMYkMKa-2340414-12187" type="single"] Today’s Video of the Day from the...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"]</div>



Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image Credit: American Chemical Society&nbsp;



---



By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Flu viruses are more flexible than expected

[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"] Today's Video of the Day from the...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="3upvlAaHgO-2256633-12187" type="single"]</div>



Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



---



By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Lake Trasimeno in Central Italy

[sendtonews key="3upvlAaHgO-2256633-12187" type="single"] Today’s Video of the Day from the...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"]</div>



Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



---



By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Detecting mercury contamination with the tap of a finger

[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"] Today's Video of the Day from the...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="iuA5mpp3jv-1641775-12187" type="single"]</div>



Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Kainji Lake, a reservoir on the Niger River.



In 1968, Kainji Lake was created by the construction of the Kainji Dam. The Niger River, the third longest in Africa, enters the lake in the north.&nbsp;



According to <a href="https://www.earth.com/news/rivers-in-the-american-west-are-a-lifesaving-resource-for-birds/">ESA</a>, the creation of the lake submerged Foge Island and the town of Bussa and permanently flooded other riverine settlements, leaving around 50,000 people displaced.&nbsp;



Large parts of Foge Island are temporarily exposed during low water tides, and the land is often used by migrating fishermen. Kainji Dam is a dam across the Niger River in Niger State of Central Nigeria. 



Wild mammals occur at relatively low densities due to illegal hunting. Lake Kainji has suffered a dramatic decline as a fishery due to the high numbers of artisanal and subsistence fisherfolk using the lake. It has been suggested that a period of closure, together with controlled fishing rights may help improve fish stocks.



Kainji Lake National Park is the oldest of its kind in Nigeria. The park contains three distinct areas: a part of the Kainji Lake, the Borgu Game Reserve to the west of the lake, and the Zugurma Game Reserve to the southeast. The park is home to around 65 mammal species, 350 bird species, and 30 species of reptiles and amphibians. 



Video/ Image Credit: European Space Agency&nbsp;



---



By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Kainji Lake in north central Nigeria

[sendtonews key="iuA5mpp3jv-1641775-12187" type="single"] Today’s Video of the Day from the...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="QGPzYnXEtN-1712599-12187" type="single"]</div>



Today’s Video of the Day from <a href="https://www.igb.illinois.edu/">Carl R. Woese Institute for Genomic Biology</a> reveals how scientists can modify common crops like soybean, rice, and wheat to protect them from heat stress.



“We need to double crop production by 2050 to feed a growing global population, and not only are we not on track to do that, but climate change is further complicating things,” said Amanda Cavanagh, a lecturer at the University of Essex. 



The study is part of Realizing Increased Photosynthetic Efficiency (RIPE), an international research project that aims to develop food crops that turn the sun’s energy into food more efficiently.



“Using an engineering approach we designed multiple alternative metabolic pathways to photorespiration. Testing them in the field showed increases in productivity which led Amanda to significantly move the project forward by showing our engineered plants can withstand pretty extreme temperature stress,” said study co-author and RIPE researcher Paul South.&nbsp;



“As the climate changes and temperature stresses increase the pressure on our global food supply, farmers will need every tool available including engineering approaches like the synthetic biology used here to maintain safe and productive harvests.”



The experts tested plants modified to have more efficient photorespiration to see if they were better adapted to warmer temperatures.&nbsp;



The team found that the engineered plants produced 26 percent more biomass than the wild-type plants exposed to the same temperatures, and had 15 percent less yield loss under the higher temperatures.



Video Credit: Amanda Nguyen/University of Illinois



---



By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Designing crops that can beat the heat

[sendtonews key="QGPzYnXEtN-1712599-12187" type="single"] Today’s Video of the Day from Carl...