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



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



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



<p>“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.</p>



<p>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;</p>



<p>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.</p>



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



<p>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.</p>



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



<p>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.</p>



<p>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.</p>



<p>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.</p>



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



<p>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;</p>



<p>“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.</p>



<p>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.</p>



<p>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.</p>



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



<p>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;</p>



<p>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.</p>



<p>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;</p>



<p>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.</p>



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



<p>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;</p>



<p>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.</p>



<p>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.</p>



<p>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;</p>



<p>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.</p>



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



<p>“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.</p>



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



<p>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;</p>



<p>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.</p>



<p>Image Credit: NASA, ESA, CSA, STScI</p>



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The ice giant Uranus in stunning detail

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

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



<p>“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.” </p>



<p>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.”</p>



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



<p>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.</p>



<p>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;</p>



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



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



<p>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.</p>



<p>“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.</p>



<p>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.</p>



<p>“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.</p>



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



<p>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;</p>



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



<p>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.</p>



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



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



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



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



<p>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.</p>



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



<p>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.</p>



<p>Tropical cyclones typically lack fronts, whereas extratropical cyclones are defined by them.</p>



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



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



<p>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.</p>



<p>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.”</p>



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



<p>Image Credit: NASA Earth Observatory</p>



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Bomb cyclone rapidly intensified in the Pacific Northwest

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

<p>Today's <strong>Image of the Day</strong> 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;</p>



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



<p>"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>.</p>



<p>"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."</p>



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



<p>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;</p>



<p>"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."</p>



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



<p>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.</p>



<p>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.</p>



<p>"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."</p>



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



<p>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.</p>



<p>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>.</p>



<p>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.</p>



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



<p>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.</p>



<p>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.</p>



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



<p>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.</p>



<p>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. </p>



<p>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.</p>



<p>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. </p>



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



<p>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. </p>



<p>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.</p>



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



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Spiral galaxy NGC 1559 is a loner in outer space

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

<p>Today's <strong>Image of the Day</strong> 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;</p>



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



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



<p>“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>.</p>



<p>“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.”</p>



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



<p>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.</p>



<p>“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.”</p>



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



<p>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;</p>



<p>“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;</p>



<p>“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.”</p>



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



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



<p>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. </p>



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



<p>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;</p>



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



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



<p>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;</p>



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



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



<p>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.</p>



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



<p>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;</p>



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



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



<p>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;</p>



<p>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.</p>



<p>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.</p>



<p>Image Credit<strong>:</strong> ESA/Hubble &amp; NASA, J. Lee</p>



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NGC 1792: A galactic powerhouse 

<p>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;</p>



<p>“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.”</p>



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



<p>“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.</p>



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



<p>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.</p>



<p>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;</p>



<p>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;</p>



<p>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;</p>



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



<p>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.</p>



<p>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.</p>



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



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



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



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



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



<p>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;</p>



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



<p><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.</p>



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



<p>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;</p>



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



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



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



<p>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;</p>



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



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



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



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



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



<p>Image Credit: NASA Earth Observatory</p>



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Fedchenko Glacier in the Pamir Mountains

<p>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.</p>



<p>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.</p>



<p>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.</p>



<p>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.</p>



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



<p>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.</p>



<p>"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.</p>



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



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



<p>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.</p>



<p>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.</p>



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



<p>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.</p>



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



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



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



<p>"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.</p>



<p>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.</p>



<p>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.</p>



<p>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.</p>



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



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



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



<p>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.</p>



<p>"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.</p>



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



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



<p>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. </p>



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



<p>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.</p>



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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...

<p>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;</p>



<p>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. </p>



<p>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.</p>



<p>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;</p>



<p>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.</p>



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



<p>“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;</p>



<p>“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.”</p>



<p>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;</p>



<p>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.</p>



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



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



<p>“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.</p>



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



<p>“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.</p>



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



<p>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). </p>



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



<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"><em>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</em></figcaption></figure>



<p>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.</p>



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



<p>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.</p>



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



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



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



<p>“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;</p>



<p>“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.</p>



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



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



<p>“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.</p>



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



<p>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.</p>



<p>Image Credit: University of Hertfordshire</p>



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

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

<p>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.</p>



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



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



<p>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. </p>



<p>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. </p>



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



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



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



<p>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.</p>



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



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



<p>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.</p>



<p>Rodents explore their environment using their whiskers, visual scans, and incessant sniffing. </p>



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



<p>Could it be that these two actions are interconnected?</p>



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



<p>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.</p>



<p>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.</p>



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



<p>"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."</p>



<p>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.</p>



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



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



<p>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.</p>



<p>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.</p>



<p>"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."</p>



<p>Their contributions to biological research could widen if this intriguing hypothesis holds true.</p>



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



<p>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. </p>



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



<p>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.</p>



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



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



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



<p>The journey ahead requires an open mind and a commitment to innovation. </p>



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



<p>Understanding this process could inform the development of new technologies. </p>



<p>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.</p>



<p>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"><em>Neuroscience &amp; Biobehavioral Reviews</em>.</a></p>



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

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

<p></p>
<div id="58e3ebce955a315103d39bd1" class="vdb_player vdb_58e3ebce955a315103d39bd158d96b98cd4fed198a0d2a49" data-placeholder="//img.vidible.tv/prod/2021-02/07/601f811ffe070f323f38c532/601f8148f7a4f6000134c0ad_1920x1080_FES_v1.jpg?w=1600&amp;h=900&amp;q=60"><script src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" type="text/javascript"></script></div>
<p><br />
<span style="font-weight: 400;">How land subsidence contributes to sea level rise Today&#8217;s </span><b>Video of the Day </b><span style="font-weight: 400;">from </span><a href="https://www.nasa.gov/goddard"><span style="font-weight: 400;">NASA Goddard</span></a><span style="font-weight: 400;"> describes how land subsidence alters the shape of ocean basins and contributes to sea level rise. </span></p>
<p><span style="font-weight: 400;">During the last ice age about 20,000 years ago, the northeastern region of the United States, <a href="https://www.earth.com/image/mistastin-lake-in-labrador-canada/">Canada,</a> and other regions were weighed down by ice sheets. When the ice melted and its weight was lifted, the land surface slowly rebounded. </span></p>
<p><span style="font-weight: 400;">The resulting land movement, as well as subsidence related to human activities, play a significant role in sea level rise. For example, the Mississippi River Delta is essentially drowning as sinking ground is combined with higher sea levels, according to NASA. Also in substances can occur in various ways during an earthquake. Broad areas of land can subside drastically during an earthquake because of offset along fault lines. Land subsidence can also occur as a result of settling and compacting of unconsiderate sediment from the shaking of an earthquake. The blunder occur, absolute subsidence may occur in the hanging wall of normal faults. As the cumulative moisture deficit is reversed, which can last up to 25 years, the surface level around the tree will rise and expand laterally.</span></p>
<p><span style="font-weight: 400;">V</span><i><span style="font-weight: 400;">ideo Credit: NASA Goddard </span></i></p>
<p><span style="font-weight: 400;">&#8211;</span><span style="font-weight: 400;">&#8212;</span></p>
<p><i><span style="font-weight: 400;">By </span></i><a href="http://csexton@earth.com"><i><span style="font-weight: 400;">Chrissy Sexton</span></i></a><i><span style="font-weight: 400;">, </span></i><a href="https://www.earth.com/staff/"><i><span style="font-weight: 400;">Earth.com</span></i></a><i><span style="font-weight: 400;"> Staff Writer</span></i></p>