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



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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



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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...

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



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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



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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



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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



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Young, massive stars in the Triangulum Galaxy

Eastern Andes mountains and their smoky canyons are captured in this Image of the Day from the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a>. The smoke is coming from several <a href="https://www.earth.com/news/plant-and-pollinator-connections-become-stronger-after-wildfires/">wildfires</a> in the upper part of the Yungas forests, which appear dark green due to the wet and cloudy conditions. Also visible in the lower left part of the image is Lake Titicaca.<ins class="adsbygoogle" style="display: block; text-align: center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-2900029420000674" data-ad-slot="3505321548"></ins>

Eastern Andes Mountains

Have you ever laid awake in bed, glancing at your peacefully sleeping partner, and wondered why sleep seems to elude you despite your best efforts? It turns out this is a common experience for women. 



A recent study conducted by researchers at CU Boulder indicates that women tend to sleep less, wake up more frequently, and enjoy less restorative sleep than men.



<h2 class="wp-block-heading" id="h-bridging-gaps-in-sleep-research">Bridging gaps in sleep research</h2>



Interestingly, these latest insights shed new light on what might be responsible for variations between men and women's sleep patterns. The implications are quite broad and potentially game-changing for biomedical research, which has been primarily centric to the male <a href="https://www.earth.com/news/sleeping-more-on-weekends-can-reduce-heart-disease-risk/" target="_blank" rel="noreferrer noopener">sleep</a> pattern for many years.



“In humans, men and women exhibit distinct sleep patterns, often attributed to lifestyle factors and caregiving roles,” said senior author Rachel Rowe, assistant professor of integrative physiology. 



“Our results suggest that biological factors may play a more substantial role in driving these sleep differences than previously recognized.”



<h2 class="wp-block-heading" id="h-sleep-revolution-and-its-gender-gap">Sleep revolution and its gender gap</h2>



In recent years, sleep research has truly experienced a boom. Thousands of animal-based studies are now exploring how <a href="https://www.earth.com/news/world-sleep-day-2024-the-quest-for-a-well-rested-society/" target="_blank" rel="noreferrer noopener">sleep</a> deprivation can increase the risk of a host of health conditions - from diabetes and obesity to Alzheimer's and immune disorders.



Yet, an interesting aspect that might have gone unnoticed for a while is the potential skewness of these results due to a significant underrepresentation of females in these studies.



Study first author Grant Mannino graduated with degrees in psychology and neuroscience and was named outstanding undergraduate of the <a href="https://www.colorado.edu/asmagazine/2024/05/07/standout-grad-eyes-career-nexus-biomedical-preclinical-research" target="_blank" rel="noreferrer noopener">College of Arts and Sciences</a>.



“Essentially, we found that the most commonly used mouse strain in biomedical research has sex-specific sleep behavior and that a failure to properly account for these sex differences can easily lead to flawed interpretations of data,” said Mannino.



<h2 class="wp-block-heading" id="h-studying-sleep-patterns-in-mice">Studying sleep patterns in mice</h2>



In their non-invasive study, the research team utilized specially-created movement-sensitive cages to understand the <a href="https://www.earth.com/news/poor-sleep-habits-may-age-the-brain-faster/" target="_blank" rel="noreferrer noopener">sleep</a> patterns of 267 "C57BL/6J" mice. The results were fascinating.



Male mice slept approximately 670 minutes within a 24-hour period, around an hour longer than their female counterparts. This extra snoozing can be attributed to non-Rapid Eye Movement (NREM) sleep, a crucial restorative sleep phase when the body repairs itself.



Notably, mice are "polyphasic sleepers," taking short naps, waking for brief periods to check their surroundings, and then returning to their slumber. The research discovered that female mice have even smaller sleep durations with their sleep being more fragmented.



<h2 class="wp-block-heading" id="h-sleep-differences-in-men-and-women">Sleep differences in men and women</h2>



This sex-biased sleep occurrence isn't unique to mice. It has been observed in various species from fruit flies and rats to zebrafish and birds. This pattern might seem bewildering, but it makes perfect evolutionary sense.



“From a biological standpoint, it could be that females are designed to be more sensitive to their environment and be aroused when they need to be because they are typically the one who is caring for the young,” Rowe said. 



“If we slept as hard as males sleep, we would not move forward as a species, right?”



<h2 class="wp-block-heading" id="h-why-do-women-sleep-less">Why do women sleep less?</h2>



But what's the culprit behind these differences? 



It seems that stress hormones, such as cortisol, and sex hormones may be major influencers. Women often report worse sleep during their menstrual cycles when estrogen and progesterone levels are lowest.



There are hypotheses suggesting women may inherently require less sleep. However, Rowe poses an intriguing question: "Are we inducing undue stress on ourselves thinking we sleep inadequately because we compare ourselves to our male partners?"



<h2 class="wp-block-heading" id="h-calls-for-equitable-research">Calls for equitable research</h2>



The authors from <a href="https://www.colorado.edu" target="_blank" rel="noreferrer noopener">CU Boulder</a> fervently hope that their findings will prompt a greater focus on understanding the biological variances in sleep patterns between the sexes. More importantly, they also hope it leads to a reevaluation of research methodology.



In 2016, the National Institutes of Health required scientists to consider "sex as a biological variable" when applying for funding for animal studies. Although progress has been made, recent research indicates that a bias towards males still exists.



This bias can have serious implications. For instance, if female representation is low in clinical trials, drugs that are more effective for women may appear ineffective, or severe side effects might be overlooked.



Finally, the research team urges fellow scientists to consider equal representation of both sexes in their studies, analyze data separately for men and women, and reevaluate past research on sleep where female representation was insufficient.



“The most surprising finding here isn’t that male and female mice <a href="https://www.earth.com/news/your-brain-literally-changes-based-on-daily-activities-and-lifestyle/" target="_blank" rel="noreferrer noopener">sleep</a> differently. It’s that no one has thoroughly shown this until now,” said Rowe. “We should have known this long before 2024.”



The study is published in the journal <a href="https://www.nature.com/articles/s41598-024-70996-1" target="_blank" rel="noreferrer noopener">Scientific Reports</a>.



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Men and women sleep differently, and we finally know why

Have you ever laid awake in bed, glancing at your...

Have you ever paused to admire a morning glory? Just as their name suggests, these flowers open at sunrise and often close by afternoon or evening.



Despite their fragile appearance, a recent study from the University of Michigan suggests that morning glory plants are quite resilient. The team discovered that these plants can withstand the effects of weed killers and display resistance to damage from herbivorous insects.



In particular, morning glory plants were found to resist glyphosate - the active component in the herbicide RoundUp.



<h2 class="wp-block-heading" id="h-plant-resistance-to-insect-damage">Plant resistance to insect damage</h2>



Interestingly, the researchers found that plants which are susceptible to glyphosate are also susceptible to damage from insects. This implies that glyphosate can disrupt the co-evolution of plants and their insect adversaries.



Study lead author&nbsp;Grace Zhang is a U-M doctoral student working with&nbsp;Regina Baucom, a professor in the Department of Ecology and Evolutionary Biology.



"When people think about herbicides and study them in <a href="https://www.earth.com/news/insects-boost-plant-evolution-in-surprising-ways/" target="_blank" rel="noreferrer noopener">plants</a>, they think about herbicide resistance," said Zhang. 



"Resistance is a big problem, tolerance is a big problem. But beyond that, we don't really have a great idea of how herbicides impact plant evolution in general, and also how it might impact how plants interact with other things in their environment."



<h2 class="wp-block-heading" id="h-more-insect-damage-on-plants-with-glyphosate">More insect damage on plants with glyphosate</h2>



The researchers set up the study with 1,600 morning glory plants in <a href="https://umich.edu" target="_blank" rel="noreferrer noopener">U-M</a>'s Matthaei Botanical Gardens. They sprayed half of the plants with glyphosate and recorded the <a href="https://www.earth.com/news/tiny-leaf-eating-insects-have-a-huge-impact-on-forests/" target="_blank" rel="noreferrer noopener">plants</a>' growth traits.



Noteworthy findings from the study included the fact that plants treated with glyphosate incurred more damage from insects compared to the non-treated (control) plants. However, plants resistant to glyphosate had less insect damage.



While conventional ecological theory would suggest a tradeoff between these two traits, Zhang said the team "saw the opposite."



The researchers also analyzed the fitness of the <a href="https://www.earth.com/news/dna-technology-will-accelerate-the-pace-of-plant-species-discovery/" target="_blank" rel="noreferrer noopener">plants</a>, i.e., their likelihood of producing seeds. They discovered a positive selection acting on glyphosate resistance: the more resistant the plants are to glyphosate, the fitter they are and the more likely to produce seeds.



<h2 class="wp-block-heading" id="h-plant-genes-and-insect-defenses">Plant genes and insect defenses</h2>



But, why are plants that are resistant to glyphosate also resistant to insect damage?



While Zhang and Baucom are yet to confirm, they hint at the role of the shikimate pathway - a metabolic process that glyphosate attacks, impacting the plant's herbivory defenses.



In contrast, the plants resistant to glyphosate seem to have multiple genes working together. These form detoxification pathways that can wade off glyphosate, thereby maintaining their insect defenses.



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



This study has profound implications for current agricultural practices and the management of herbicide application. Understanding the dual resistance to both glyphosate and herbivory challenges the conventional approach to pest and weed management. 



For farmers, this could mean re-evaluating the use of herbicides like glyphosate to mitigate potential unintended ecological repercussions. 



The development of crops that can naturally resist both herbicides and <a href="https://www.earth.com/news/how-does-the-milkweed-beetle-safely-feed-on-a-toxic-plant/" target="_blank" rel="noreferrer noopener">insect</a> predation could lead to more sustainable agricultural strategies, reducing the need for chemical inputs while preserving biodiversity in farmlands.



<h2 class="wp-block-heading" id="h-future-research-directions">Future research directions </h2>



The findings open the door to further exploration into the genetic underpinnings of plant resistance. Future research could investigate the exact genetic pathways involved in this dual resistance, potentially leading to breakthroughs in genetic engineering for crop improvement.



Another avenue of research could focus on the long-term evolutionary consequences of glyphosate use on plant-insect interactions. 



Scientists could harness these insights for developing crops that are better suited to withstand both chemical and biological stressors, ensuring food security in an ever-changing environment.



<h2 class="wp-block-heading" id="h-human-made-impacts-on-nature">Human-made impacts on nature</h2>



"Studies in the past usually look at the evolution of herbicide resistance in these plants or they'll look at how applying the herbicide directly to specific insects will affect them," Zhang said. 



"But they haven't really looked at this question from more of a community level: How does herbicide act as a disruptor on this community level?" 



"So that's what we really wanted to focus on: how does this new disruptive agent that is human-made impact a very natural, long standing relationship between plants and their insects?"



The study is published in the journal <a href="https://nph.onlinelibrary.wiley.com/doi/10.1111/nph.20238" target="_blank" rel="noreferrer noopener">New Phytologist</a>.



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Herbicides disrupt the co-evolution of plants and insects

Have you ever paused to admire a morning glory? Just...

The Chinese Mars rover Zhurong is adding an exciting twist to the story and history of water on Mars. 



After landing in southern Utopia Planitia on Mars in May 2021, the now-defunct Zhurong rover went to work exploring the Martian surface, and its latest findings might just change the way we think about the Red Planet.



Bo Wu and a team of researchers from <a href="https://www.polyu.edu.hk/en/" target="_blank" rel="noreferrer noopener">Hong Kong Polytechnic University</a> believe they've found compelling evidence of an ocean shoreline for a massive body of water that once covered Mars' northern lowlands.



<h2 class="wp-block-heading" id="h-what-is-the-zhurong-mars-rover">What is the Zhurong Mars rover?</h2>



The Zhurong rover is <a href="https://www.earth.com/news/china-plans-to-inhabit-a-space-station-on-the-moon-by-2030/" target="_blank" rel="noreferrer noopener">China's first foray</a> into Martian exploration, landing successfully on Mars in May 2021 as part of the <a href="https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2020-049A" target="_blank" rel="noreferrer noopener">Tianwen-1</a> mission. 



Weighing around 240 kilograms (530 lbs) -- about the size of a small car -- Zhurong is packed with scientific instruments, including navigation and topography cameras, a multispectral camera for analyzing surface materials, and a ground-penetrating radar that can probe up to 100 meters beneath the surface. 



These tools allow Zhurong to capture detailed images, study the composition of rocks and soil, and investigate the planet's subsurface structures.



What sets Zhurong apart is its ability to study Mars both above and below ground. The ground-penetrating radar is particularly exciting because it helps scientists search for signs of water ice and understand the geological layers hidden <a href="https://www.earth.com/news/does-life-exist-below-the-icy-surface-of-mars/" target="_blank" rel="noreferrer noopener">beneath the surface.</a> 



The rover also carries instruments to examine <a href="https://www.earth.com/news/the-internal-structure-of-mars-core-is-finally-revealed/" target="_blank" rel="noreferrer noopener">Mars' magnetic field</a> and atmospheric conditions, contributing valuable data to our understanding of the planet's climate and potential for habitability.



<h2 class="wp-block-heading" id="h-zhurong-sees-water-related-features-on-mars">Zhurong sees water-related features on Mars</h2>



For years, scientists have pondered the possibility of a vast ocean on Mars, especially during the Hesperian period about 3.7 billion years ago. Concrete proof, however, has been hard to come by. 



Using a mix of Zhurong's onboard cameras and ground-penetrating radar, plus remote sensing data from orbiting satellites, the team identified several intriguing water-related features around the rover's landing area.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/11/Zhurong-mars-rover_china_landing-site_ocean-shore_Sci-Reports_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/11/Zhurong-mars-rover_china_landing-site_ocean-shore_Sci-Reports_1s.webp" alt="The Zhurong landing site (red cross) shown on the geologic map by Tanaka et al. Regions of different colors indicate different geologic units. The red box shows the study area, covering an area of ~ 1800 km × 800 km. The thick black line is the Deuteronilus contact indicating a possible shoreline across the region. The background map is a shaded relief of the MOLA topography." class="wp-image-1951081"/></a><figcaption class="wp-element-caption">The Zhurong landing site (red cross) shown on the geologic map by Tanaka et al. Regions of different colors indicate different geologic units. The red box shows the study area, covering an area of ~ 1800 km × 800 km. The thick black line is the Deuteronilus contact indicating a possible shoreline across the region. The background map is a shaded relief of the MOLA topography.</figcaption></figure>



Since touching down, Zhurong has traveled about 1.2 miles, studying the geology of its surroundings in search of signs of water or ice. 



The features spotted include crater-like pitted cones, troughs, sediment channels, and <a href="https://www.earth.com/news/water-frost-detected-on-mars-enormous-volcanoes/" target="_blank" rel="noreferrer noopener">mud volcano formations</a>. If that sounds like the remnants of a beachfront, you're onto something. 



According to Bo Wu and his colleagues, these formations are consistent with what you'd expect to find in a nearshore zone, suggesting this area was once a coastline.



<h2 class="wp-block-heading" id="h-dating-the-martian-ocean">Dating the Martian ocean</h2>



Based on the composition of surface deposits, the team estimates that the ocean likely existed around 3.68 billion years ago. 



"The water was heavily silted, forming the layering structure of the deposits," study co-author Sergey Krasilnikov of the Hong Kong Polytechnic University told Reuters. 



This silt-laden water would have created distinct sedimentary layers, much like those found in ancient seabeds on Earth.



Interestingly, the researchers propose that after forming, the ocean froze over for about 10,000 to 100,000 years -- a mere <a href="https://www.earth.com/news/when-was-mars-habitable-much-more-recently-than-we-thought/" target="_blank" rel="noreferrer noopener">blink in geological terms</a>. 



This freezing period etched out the coastline features observed today before the ocean eventually dried up roughly 260 million years later. Imagine a vast frozen ocean, sitting quietly on Mars, waiting for its turn to disappear.



<h2 class="wp-block-heading" id="h-not-everyone-agrees">Not everyone agrees</h2>



However, not everyone is jumping on the bandwagon. 



Benjamin Cardenas of <a href="https://www.psu.edu/" target="_blank" rel="noreferrer noopener">Pennsylvania State University</a> points out that erosion over billions of years would likely have erased such delicate features. It's a fair concern -- Mars isn't exactly a place where things stay preserved forever. 



Wu acknowledges this skepticism but suggests that asteroid impacts might have resurfaced portions of the shoreline, making them detectable today.



<h2 class="wp-block-heading" id="h-implications-for-martian-life">Implications for Martian life</h2>



So, what does all this mean in the grand scheme of things? Well, the presence of an ancient ocean has profound implications for <a href="https://www.earth.com/news/meteorite-that-struck-mars-reveals-when-the-planet-had-liquid-water/" target="_blank" rel="noreferrer noopener">our understanding of Mars</a>. 



Water is a key ingredient for life as we know it. If Mars had oceans, could it have also hosted life? It's a tantalizing thought that keeps scientists up at night.



NASA's Insight Lander 



Adding another layer to the mystery, <a href="https://science.nasa.gov/mission/insight/" target="_blank" rel="noreferrer noopener">NASA's Insight lander</a> found that a significant amount of water had seeped into Mars's crust. 



"At least we have identified a place that should, in principle, be able to sustain life," Michael Manga of the <a href="https://www.universityofcalifornia.edu/" target="_blank" rel="noreferrer noopener">University of California</a>, one of the study authors, said in a previous statement. 



This underground water could have provided a stable environment for <a href="https://www.earth.com/news/insights-alien-life-mars-water-sulfur-discovered-gained-studying-extreme-life-earth/" target="_blank" rel="noreferrer noopener">life to develop</a>.



<h2 class="wp-block-heading" id="h-what-s-next-for-zhurong-and-mars-water">What's next for Zhurong and Mars water?</h2>



But here's the kicker: to get definitive answers, we need to bring Martian samples back to Earth for detailed analysis. 



China's Tianwen 3 Mars sample return mission aims to do just that by 2031, potentially beating NASA's own sample return mission to the punch. 



If all goes according to plan, we'll have pieces of Mars right here on Earth in less than a decade.



As we await these missions, Zhurong continues to send valuable data, inching us closer to understanding the Red Planet's watery past. 



Could Mars have been teeming with life billions of years ago? It's the million-dollar question. Only time -- and more research -- will tell.



The full study was published in the journal <a href="https://www.nature.com/articles/s41598-024-75507-w" target="_blank" rel="noreferrer noopener">Scientific Reports</a>.



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China’s Mars Zhurong rover finds an ocean shoreline on the Red Planet

The Chinese Mars rover Zhurong is adding an exciting twist...

The magnetic North Pole, a vital navigational anchor for our planet, is far from stationary. Most of us remain blissfully unaware that it shifts constantly under the influence of dynamic forces beneath the Earth’s crust. 



However, recent movements have been more extreme than usual, making people take notice. Once steady, this silent sentinel has recently been speeding erratically toward Russia at an unprecedented pace.



Such rapid shifts could have dramatic consequences, disrupting modern navigation systems and, by extension, the way we navigate our daily lives.



<h2 class="wp-block-heading" id="h-what-exactly-is-the-magnetic-north-pole">What exactly is the magnetic North Pole?</h2>



First, let's make it clear what exactly we're talking about. The magnetic North Pole is the point on Earth where the <a href="https://www.earth.com/earthpedia-articles/earths-magnetic-field-origin-structure-and-impact-on-humanity/" target="_blank" rel="noreferrer noopener">planet’s magnetic field</a> points directly downward. This is the direction that your compass needle aligns with when you’re navigating outdoors. 



Unlike the geographic North Pole, which is fixed in the Arctic, the magnetic north pole is constantly on the move, drifting several kilometers each year due to changes in Earth’s molten core. 



This movement can sometimes throw off navigation systems, requiring updates to maps and compasses to stay accurate.



What makes the magnetic North Pole even more interesting is how it affects both technology and nature. 



For example, airplanes and ships rely on accurate magnetic readings for safe travel, while some animals use Earth’s magnetic field to migrate across vast distances. 



<h2 class="wp-block-heading" id="h-the-northern-odyssey-from-canada-to-siberia">The northern odyssey: From Canada to Siberia</h2>



Ever since we started tracking it, the magnetic North Pole has been on the move. However, its recent behavior is quite out of the ordinary. 



Once comfortably located in northern Canada, the pole kicked into high gear in the late 20th century, making its way across the <a href="https://www.earth.com/news/arctic-ocean-warming-four-times-faster-than-global-average/" target="_blank" rel="noreferrer noopener">Arctic Ocean</a> by the 1990s.



From there, the pace has increased progressively , peaking at an astonishing 55 kilometers per year during the 2010s.



Presently, it's hurtling at a slightly reduced but still impressive speed of 25 kilometers per year towards Siberia.



<h2 class="wp-block-heading" id="h-what-s-steering-the-magnetic-north-pole">What's steering the magnetic North Pole?</h2>



Intellectually stimulating debates have arisen among scientists trying to decipher the underlying cause of this unusual phenomenon.



Dr. William Brown, a renowned geomagnetic field analyst, identifies three possible culprits behind the magnetic North Pole's unusual behavior. 



First, changes in the flow of molten iron beneath the <a href="https://www.earth.com/news/earths-crust-is-dripping-under-turkey/" target="_blank" rel="noreferrer noopener">Earth’s crust</a> could be altering the magnetic field’s strength and direction, as the planet's outer core dynamics play a crucial role in generating the field in the first place.



Second, high-energy solar particles interacting with the <a href="https://www.earth.com/news/mysterious-solar-shockwave-has-cracked-earths-magnetosphere/" target="_blank" rel="noreferrer noopener">Earth’s magnetosphere</a>, such as during solar storms and winds, might be causing fluctuations in the magnetic field. 



Finally, the phenomenon may be linked to the Earth's history of magnetic pole reversals, which have occurred nearly 200 times over the past 100 million years. The most recent of these reversals occurred approximately 800,000 years ago.



<h2 class="wp-block-heading" id="h-navigating-without-a-north-star">Navigating without a North Star</h2>



The potential chaos that the moving magnetic pole can cause is not abstract or confined to scholarly concern. 



Our technology is deeply intertwined with magnetic orientations, and any abrupt changes can cause significant turmoil. 



Devices like smartphones, cars, and military equipment rely on the World Magnetic Model (WMM), which is designed by the British Geological Survey and NOAA. 



This model tracks the pole’s movements and ensures accurate <a href="https://www.earth.com/news/earths-magnetic-field-is-shifting-and-putting-navigation-at-risk/" target="_blank" rel="noreferrer noopener">navigation</a>. If the pole's movement outpaces updates to the WMM, our devices could miscalculate locations and throw our wayfinding abilities into disarray.



<h2 class="wp-block-heading" id="h-preparing-for-the-polar-paradox">Preparing for the polar paradox</h2>



Mitigating the potential risks of such a change involves a three-pronged approach: frequent updates to the WMM, expanding research to continue monitoring the <a href="https://www.earth.com/news/earths-inner-core-rotation-has-begun-moving-backwards/" target="_blank" rel="noreferrer noopener">Earth’s core</a> dynamics, and raising public awareness. 



Through these efforts, industries that rely heavily on magnetic field-based navigation are being prepped for any potential upcoming disruptions.



<h2 class="wp-block-heading" id="h-gearing-up-for-a-world-upside-down">Gearing up for a world upside down?</h2>



While the pole's movement is no longer as rapid, it remains a crucial area of research.



Scientists from <a href="https://www.noaa.gov/" target="_blank" rel="noreferrer noopener">NOAA</a> and other organizations are keeping a close eye on its shifting trajectory, ensuring our technological world is prepared for any seismic shifts in Earth's magnetic nature. 



In the face of a potential world where the poles flip, these insights and precautionary measures could prove indispensable.



So, the magnetic North Pole's flight towards Russia isn't just an intriguing natural occurrence. Its implications for our global navigation systems and technologies could be profound and far-reaching. 



<h2 class="wp-block-heading" id="h-magnetic-north-pole-and-earth-s-future">Magnetic North Pole and Earth’s future</h2>



Rapid movement of the magnetic North Pole&nbsp;is&nbsp;not&nbsp;just&nbsp;an&nbsp;issue&nbsp;for&nbsp;technology&nbsp;and navigation but&nbsp;also&nbsp;offers&nbsp;insight&nbsp;into the inner workings&nbsp;of the Earth. The&nbsp;erratic&nbsp;behavior of the&nbsp;pole&nbsp;reflects&nbsp;what is happening in&nbsp;the dynamic processes&nbsp;deep within our&nbsp;outer core, where molten iron generates&nbsp;a&nbsp;<a href="https://www.earth.com/news/doughnut-shaped-region-discovered-in-earths-liquid-core-impacts-our-magnetic-field/" target="_blank" rel="noreferrer noopener">magnetic field</a>. By studying this phenomenon, scientists can gain a better understanding of Earth's geodynamo,&nbsp;which is&nbsp;the engine behind the magnetic field that shields us from harmful solar radiation. The&nbsp;shifting&nbsp;pole&nbsp;also&nbsp;raises questions over the possibility of a full magnetic reversal - a natural process&nbsp;in&nbsp;which&nbsp;the North and South magnetic poles swap places. While such reversals have happened thousands of times in&nbsp;the&nbsp;Earth's history, their effects&nbsp;cannot&nbsp;be predicted.



A reversal could temporarily weaken Earth's magnetic field,&nbsp;meaning that&nbsp;the planet would be exposed to&nbsp;more intense and damaging cosmic radiation,&nbsp;which would affect living organisms, ecosystems and infrastructure. Monitoring&nbsp;changes&nbsp;in&nbsp;this&nbsp;manner&nbsp;helps researchers&nbsp;keep&nbsp;an eye on&nbsp;the Earth's interior and also&nbsp;prepares&nbsp;humanity for potential future challenges.



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Magnetic North Pole is moving and changing faster than ever, surprising scientists

The magnetic North Pole, a vital navigational anchor for our...

The saber-toothed cat, an iconic predator from the Ice Age, continues to captivate scientists and enthusiasts alike with its mysterious legacy. 



Our planet, with its rich history etched into layers of time, acts as a vast library of ancient tales, with each era preserving the stories of remarkable creatures.



Among these is a stunning new chapter - scientists have uncovered a mummified baby saber-toothed cat in Siberia.



The discovery, which boasts an extraordinary level of preservation, offers a rare and intimate glimpse into the anatomy and lifestyle of this long-extinct <a href="https://www.earth.com/news/saber-toothed-predator-was-king-prior-to-the-great-dying/" target="_blank" rel="noreferrer noopener">predator</a>. The research also reveals secrets that have been frozen in time.



<h2 class="wp-block-heading" id="h-first-recorded-mummified-saber-toothed-cat">First recorded mummified saber-toothed cat</h2>



The Siberian Ice Age cub is the first recorded mummified saber-toothed cat - a discovery that is setting off waves of excitement among paleontologists worldwide.



It allows us a sneak-peek into the past, and a glimpse of what saber-toothed cats looked like.



The mummy offers precious insights into the cat's muscle structure and how it might have impacted its <a href="https://www.earth.com/news/smilodon-fatalis-young-saber-toothed-cats-had-double-fangs/" target="_blank" rel="noreferrer noopener">hunting methods</a>.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/11/sabertooth-kitten_frozen_fur_profile_credit-Prof-Alexey-V-Lopatin_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/11/sabertooth-kitten_frozen_fur_profile_credit-Prof-Alexey-V-Lopatin_1s.webp" alt="Images highlight the differences in external appearance of the heads of two 3-week-old cub specimens — the mummified Homotherium latidens (saber-toothed cat) at the top and Panthera leo (modern lion) below. courtesy Prof. Alexey V. Lopatin" class="wp-image-1951075"/></a><figcaption class="wp-element-caption">Images highlight the differences in external appearance of the heads of two 3-week-old cub specimens — the mummified Homotherium latidens (saber-toothed cat) at the top and Panthera leo (modern lion) below. courtesy Prof. Alexey V. Lopatin</figcaption></figure>



The mummy's face, forelimbs, torso, and part of its body were remarkably intact and generously covered with thick, soft fur that was between 0.8 and 1.2 inches (20 to 30 millimeters) in length.



Alexey V. Lopatin is a full member of the <a href="https://new.ras.ru/en/" target="_blank" rel="noreferrer noopener">Russian Academy of Sciences</a> in Moscow, director of the academy’s Borissiak Paleontological Institute, and the lead author of the study.



"It’s a fantastic feeling to see with your own eyes the life appearance of a long-extinct animal. Especially when it comes to such an interesting predator as the sabre-toothed cat," said Lopatin.



<h2 class="wp-block-heading" id="h-learning-about-an-extinct-species">Learning about an extinct species</h2>



The mummy is the first Asian record of the saber-toothed cat species Homotherium latidens.



Other Ice Age mummies, like woolly rhinos and <a href="https://www.earth.com/news/ancient-mammoths-survived-longer-than-initially-thought/" target="_blank" rel="noreferrer noopener">mammoths</a>, have been found fairly commonly in the Siberian region. However, mummified cats are an extraordinary rarity.



"Before this discovery, there were just two known cat mummies, both cubs of the cave lion Panthera spelaea from Yakutia’s Uyandina River basin. Now, we have added the Homotherium cub to this list", explained Lopatin.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/11/sabertooth-cub-skull_lion-skull_credit-Prof-Alexey-V-Lopatin_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/11/sabertooth-cub-skull_lion-skull_credit-Prof-Alexey-V-Lopatin_1s.webp" alt="The new mummy findings reveal that saber-toothed cubs differed dramatically from modern lion cubs of a similar age. The image above highlights differences in the skulls of the mummifed Homotherium latidens (A, B) and Panthera leo (C, D) at 3 weeks old. courtesy Prof. Alexey V. Lopatin" class="wp-image-1951071"/></a><figcaption class="wp-element-caption">The new mummy findings reveal that saber-toothed cubs differed dramatically from modern lion cubs of a similar age. The image above highlights differences in the skulls of the mummifed Homotherium latidens (A, B) and Panthera leo (C, D) at 3 weeks old. courtesy Prof. Alexey V. Lopatin</figcaption></figure>



The next steps in learning about this extinct <a href="https://www.earth.com/news/two-new-species-of-sabertooth-cat-discovered-in-south-africa/" target="_blank" rel="noreferrer noopener">species</a> involved the analysis of extracted DNA, and detailed examination of the cub's skeleton, muscles, and hair.



Paleontologist Jack Tseng, an associate professor in the Integrative Biology Department at the <a href="https://www.berkeley.edu/" target="_blank" rel="noreferrer noopener">University of California, Berkeley</a>, who was not involved in the discovery, expressed his astonishment at the find.



"It’s rare to find bones of this lineage in the first place, let alone soft tissue associated with it," said Tseng.



Speaking to CNN, Tseng shared that he was at a loss for words when considering "the treasure trove of information that could come out of this singular discovery."



"I don’t know if other paleontologists’ minds are as blown as mine, but it’s like reality changes now that we’ve seen this."



<h2 class="wp-block-heading" id="h-clues-from-the-past">Clues from the past</h2>



Preserved in permafrost, the cub was discovered near the Badyarikha River in northeast Yakutia by local diggers in 2020. 



Radiocarbon dating estimates the cub to be at least 35,000 years old, making its lifetime coincide with the latter part of the Pleistocene epoch (roughly 2.6 million to 11,700 years ago).



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/11/sabertooth-cub-paw_lion-paw_credit-Prof-Alexey-V-Lopatin_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/11/sabertooth-cub-paw_lion-paw_credit-Prof-Alexey-V-Lopatin_1s.webp" alt="Pictured here are the forepaws of 3-week-old large cubs. A, B and C reveal views of the mummified Homotherium latidens specimen: A is a thumb claw; B a second digit claw; and С a plantar view. D shows the plantar view of the right forepaw of a Panthera leo specimen. courtesy Prof. Alexey V. Lopatin" class="wp-image-1951069"/></a><figcaption class="wp-element-caption">Pictured here are the forepaws of 3-week-old large cubs. A, B and C reveal views of the mummified Homotherium latidens specimen: A is a thumb claw; B a second digit claw; and С a plantar view. D shows the plantar view of the right forepaw of a Panthera leo specimen. courtesy Prof. Alexey V. Lopatin</figcaption></figure>



The preservation of the cub's forelimbs was exceptional, with claws and the fleshy pads or "beans" (as modern cat admirers like to call them) still intact. 



The cubs of this ancient and long-extinct species varied significantly from modern lion cubs. 



The saber-toothed cub seemed to have longer forelimbs, a bigger mouth opening, a more solid neck, darker coat, and smaller ears.



<h2 class="wp-block-heading" id="h-decoding-the-saber-toothed-cat-mystery">Decoding the saber-toothed cat mystery</h2>



The cub's forearms and paw resembled a bear's, which are known for their strength in collecting food.



This similarity suggests that adult Homotherium may have depended on their forearms, possibly using them to stabilize their prey.



Until now, 3D digital modeling of scanned <a href="https://www.earth.com/news/ugly-fossil-unveils-secrets-of-extinct-cats/" target="_blank" rel="noreferrer noopener">fossils</a> was used to hypothesize saber-toothed cat anatomy. However, nothing compares to witnessing these limbs "in the flesh." 



This find is not just about the Homotherium mummy; it offers a unique insight into the entire evolutionary history of the feline group.



The saber-toothed cat cub mummy is an invaluable find, adding another vivid glimpse into our planet's fascinating history. 



The research paper is published in the journal <a href="https://www.nature.com/articles/s41598-024-79546-1#citeas">Scientific Reports</a>.



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Mummified baby saber-toothed cat found with fur and toes intact

The saber-toothed cat, an iconic predator from the Ice Age,...

A prescription medication that has been available in the U.S. since 1992, which many people recognize for treating hair loss and enlarged prostate, seems to have another significant health benefit.



Recent research suggests that a drug called finasteride could lower cholesterol levels and reduce the risk of heart disease. That's a surprising twist for a drug that's been around for decades.



Curiosity led <a href="https://fshn.illinois.edu/directory/jaume6" target="_blank" rel="noreferrer noopener">Dr. Jaume Amengual</a>, an assistant professor in the Department of Food Science and Human Nutrition at the <a href="https://fshn.illinois.edu/" target="_blank" rel="noreferrer noopener">University of Illinois</a>, to explore this unexpected connection. 



After noticing something unusual in a national survey, he decided to dig deeper. 



"When we looked at the men taking finasteride in the survey, their <a href="https://www.earth.com/news/the-power-of-fish-oil-in-combating-high-cholesterol/" target="_blank" rel="noreferrer noopener">cholesterol levels</a> averaged 30 points lower than men not taking the drug. I thought we'd see the opposite pattern, so it was very interesting," Dr. Amengual enthused.



<h2 class="wp-block-heading" id="h-lowering-cholesterol-with-finasteride">Lowering cholesterol with finasteride?</h2>



The initial clue came from the <a href="https://www.cdc.gov/nchs/nhanes/index.htm" target="_blank" rel="noreferrer noopener">National Health and Nutrition Examination Survey</a> conducted between 2009 and 2016. 



This survey collects health information from thousands of Americans. In this data, men using finasteride as a <a href="https://www.earth.com/news/new-natural-cure-male-baldness-highly-effective-sugar-2-deoxy-d-ribose/" target="_blank" rel="noreferrer noopener">hair loss treatment</a> had significantly lower cholesterol levels compared to those who weren't on the medication. 



A 30-point difference is substantial and caught the researchers' attention. But observational studies have limitations. The sample size of men over 50 using finasteride was small. 



"This was not a clinical study in which you can control everything perfectly," Amengual noted. "It was more of an observation that led us to say, 'Okay, now we've seen this in people. Let's see what happens in mice.'"



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



To get a clearer picture, the team turned to laboratory mice. Doctoral student <a href="https://www.linkedin.com/in/donald-molina-ba3099197/?locale=es_ES" target="_blank" rel="noreferrer noopener">Donald Molina Chaves</a> conducted experiments on mice predisposed to <a href="https://www.earth.com/news/fathers-diets-impact-the-heart-health-of-their-daughters/" target="_blank" rel="noreferrer noopener">atherosclerosis</a> -- a condition where arteries narrow due to plaque buildup. 



The mice were fed different doses of finasteride along with a high-fat, high-cholesterol diet.



"Mice that were given a high dose of finasteride showed lower <a href="https://www.earth.com/news/certain-gut-bacteria-lower-cholesterol-and-the-risk-of-heart-disease/" target="_blank" rel="noreferrer noopener">cholesterol levels</a> within the plasma as well as in the arteries," Molina Chaves said. "There were also fewer lipids and inflammatory markers in the liver." 



These findings suggested that finasteride doesn't just lower cholesterol in the blood but might also <a href="https://www.earth.com/news/lifestyle-choices-in-young-adulthood-impact-cognitive-ability-in-midlife/" target="_blank" rel="noreferrer noopener">reduce inflammation</a> and plaque formation in arteries.



While the highest dose had significant effects, it's not a dose humans would take. 



"It's an incredibly high level of the drug. But we use mice as a model, and they are extremely resistant to things that would kill any of us," Amengual explained. "So it is not that wild when you think about it that way." 



The results in mice provide a direction for future human studies.



<h2 class="wp-block-heading" id="h-finasteride-testosterone-and-heart-disease">Finasteride, testosterone, and heart disease</h2>



So why would a hair loss drug affect <a href="https://www.earth.com/news/new-study-eating-eggs-is-not-bad-for-your-health-despite-years-of-warnings/" target="_blank" rel="noreferrer noopener">cholesterol levels</a>? It comes down to hormones. 



Finasteride works by blocking a protein that activates testosterone, specifically reducing levels of <a href="https://www.earth.com/news/men-with-low-testosterone-have-a-higher-risk-of-mortality/" target="_blank" rel="noreferrer noopener">dihydrotestosterone (DHT)</a>. DHT is linked to hair loss, prostate enlargement, and, as it turns out, possibly heart disease.



"I was reading about this medication one day, and I started to notice that there were not many long-term studies of the implications of the drug," Amengual said. 



"Initially, it was just my own curiosity, based on the fact that hormone levels are known to have an effect on atherosclerosis, hair loss, and prostate issues. So, we decided to dig into it."



Testosterone and its derivatives can influence the development of atherosclerosis. By altering these hormone levels, finasteride might indirectly impact cholesterol metabolism and inflammation, leading to improved <a href="https://www.earth.com/news/social-expectations-of-men-are-bad-for-their-heart-health/" target="_blank" rel="noreferrer noopener">heart health</a>.



<h2 class="wp-block-heading" id="h-more-surprises-from-finasteride">More surprises from finasteride</h2>



Interestingly, these findings might benefit more than just men dealing with hair loss or prostate issues. 



Transgender individuals undergoing hormone therapy often face a higher risk of heart disease due to hormonal changes. 



Finasteride is sometimes prescribed during gender transitions to manage hair loss triggered by hormone treatments.



"Over the past decade, doctors have started prescribing this drug for individuals transitioning either from male to female or female to male. In both cases, the hormonal changes can trigger hair loss," Amengual said. 



"The interesting thing is that transgender people are also at a higher risk of <a href="https://www.earth.com/news/depression-and-cardiovascular-diseases-are-genetically-linked/" target="_blank" rel="noreferrer noopener">cardiovascular diseases</a>. So this drug could have a potential beneficial effect to prevent cardiovascular disease not only in cis men, but also in transgender individuals."



This opens up the possibility that finasteride could serve a dual purpose for transgender patients, helping with hair loss while also reducing heart disease risk.



<h2 class="wp-block-heading" id="h-what-s-the-catch-understanding-finasteride-risks">What's the catch? Understanding finasteride risks</h2>



Of course, no medication is without risks. Finasteride can cause side effects, and it's important to consider them. 



Some users experience <a href="https://www.earth.com/news/men-exhibit-better-sexual-health-eating-a-plant-based-vegan-diet/" target="_blank" rel="noreferrer noopener">sexual side effects</a> like decreased libido, erectile dysfunction, and reduced ejaculate volume. These effects happen because finasteride reduces DHT, which plays a role in sexual function.



There have also been reports of psychological effects such as depression, anxiety, and mood changes. While not everyone experiences these, they're important to monitor. 



Physical side effects can include breast tenderness or enlargement, rashes, and swelling in the hands or feet. Rarely, finasteride can affect liver enzymes, so regular medical check-ups are recommended.



A small percentage of users report persistent side effects even after stopping the medication, a condition referred to as Post-Finasteride Syndrome (PFS). 



Symptoms can include ongoing sexual dysfunction and psychological issues. Research is ongoing to understand and address these concerns.



<h2 class="wp-block-heading" id="h-what-the-future-holds-for-finasteride">What the future holds for finasteride</h2>



These discoveries suggest that finasteride could have a role in heart health beyond its current uses. More research is needed, though. 



Clinical trials involving people would help determine if the cholesterol-lowering effects seen in mice also occur in humans at practical doses.



"This was not a clinical study in which you can control everything perfectly," Amengual emphasized. "It was more of an observation that led us to say, 'Okay, now we've seen this in people. Let's see what happens in mice.'"



If future studies confirm these benefits, finasteride could become part of a strategy to prevent <a href="https://www.earth.com/news/artificial-sweetener-erythritol-sugar-substitute-linked-to-blood-clots-heart-disease/" target="_blank" rel="noreferrer noopener">heart disease</a>, especially in populations at higher risk.



<h2 class="wp-block-heading" id="h-a-new-hope-proceed-with-eyes-wide-open">A new hope? Proceed with eyes wide open</h2>



Finasteride has been around for a while, helping many with hair loss and prostate issues. Now, it might have a new role to play in promoting heart health. 



This could be significant not just for men but also for the transgender community and others at risk of cardiovascular disease.



As with any medical treatment, it's crucial to consult healthcare providers before making changes. Finasteride's potential benefits must be balanced with its risks. But this research opens up exciting possibilities.



The full study was published in the&nbsp;<a href="https://www.jlr.org/article/S0022-2275(24)00012-9/fulltext" target="_blank" rel="noreferrer noopener">Journal of Lipid Research</a>.



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Old drug now called a "magic pill" because it regrows hair and improves heart health

A prescription medication that has been available in the U.S....

Phosphorus, a crucial nutrient for soil fertility and life sustainability, is increasingly vanishing from U.S. farmland, washing into rivers and streams at alarming rates.&nbsp;



A new study led by researchers at the <a href="https://www.psu.edu/" target="_blank" rel="noreferrer noopener">Pennsylvania State University</a> reveals that despite efforts to curb phosphorus loss, agricultural runoff has continued to rise over the past four decades, posing significant threats to <a href="https://www.earth.com/news/vaccinating-plants-could-boost-global-food-security/" target="_blank" rel="noreferrer noopener">food security</a> and water quality.



<h2 class="wp-block-heading" id="h-soil-nutrient-and-phosphorus-loss">Soil nutrient and phosphorus loss</h2>



Phosphorus is indispensable for life, playing a key role in DNA formation and cellular energy transfer.&nbsp;



However, unlike nitrogen, it is a non-renewable resource with limited geological reserves. Once it is lost from soil and enters <a href="https://www.earth.com/news/humans-impacts-on-waterways-contribute-to-the-climate-crisis/" target="_blank" rel="noreferrer noopener">waterways</a>, it cannot naturally replenish in agricultural lands.



“This is a problem for many reasons,” said Li Li, professor of civil and environmental engineering at Penn State and corresponding author of the study.&nbsp;



“When it’s lost from farmland, it can reduce crop yields, potentially leading to higher food prices. Then, when phosphorus enters our waterways, it can cause harmful algal blooms that can make water unsafe for swimming and fishing - and can even reduce oxygen levels in water and kill fish and other aquatic life.”



Li also highlighted the economic impact of phosphorus depletion: “It makes it more expensive to treat drinking water, which means higher water bills for all of us.”



<h2 class="wp-block-heading" id="h-rising-phosphorus-levels-in-rivers">Rising phosphorus levels in rivers</h2>



Analyzing data from 430 U.S. <a href="https://www.earth.com/news/global-warming-is-disrupting-the-seasonal-flow-of-rivers/" target="_blank" rel="noreferrer noopener">rivers</a> spanning 1980 to 2019, the research team used a deep learning model to uncover troubling trends. 



While phosphorus levels have declined in 60% of the studied rivers, overall phosphorus flowing into waterways has increased.



“Agricultural areas are the biggest contributors to the problem, with phosphorus levels increasing in most rivers near agricultural areas, even as they decline in rivers near urban areas,” Li explained.&nbsp;



“This suggests that efforts to control phosphorus pollution from sources like agricultural runoff are not as effective as we thought.”



By contrast, targeted efforts to reduce phosphorus pollution from urban wastewater treatment plants appear to be succeeding.&nbsp;



<h2 class="wp-block-heading" id="h-soil-nutrient-loss-is-beyond-local-control">Soil nutrient loss is beyond local control </h2>



However, the researchers warn that the broader problem is worsening due to factors beyond local control, particularly the increased frequency of extreme weather events linked to climate change.



“This means that even though we’re doing a better job at limiting phosphorus pollution from urban areas, the problem is getting worse overall, due to factors largely beyond the control of just one region,” Li said.



<h2 class="wp-block-heading" id="h-the-role-of-climate-change">The role of climate change</h2>



<a href="https://www.earth.com/news/droughts-and-extreme-weather-events-are-escalating/" target="_blank" rel="noreferrer noopener">Extreme weather events</a>, such as heavier rainfall and flooding, have amplified phosphorus runoff into waterways. As storms grow wetter and more frequent due to climate change, the volume of water flowing through rivers increases, pulling more phosphorus from the soil.



“We’ve seen from recent weather events that water quantity, the amount of water that storms and waterways carry, can lead to dangerous flooding and mudslides,” Li said.&nbsp;



“What we wanted to understand is what happens to the land when these storms pull the subsurface of the soil into rivers and streams. What we found is an alarming loss of this finite element that lets soil sustain life.”



<h2 class="wp-block-heading" id="h-innovative-solutions-are-needed">Innovative solutions are needed</h2>



To combat this escalating issue, the researchers emphasize the need for innovation and changes in agricultural practices. One promising development is a technology invented at Penn State by alumnus Hunter Swisher.



Swisher, founder and CEO of <a href="https://www.phospholutions.com/" target="_blank" rel="noreferrer noopener">Phospholutions</a>, has developed a fertilizer designed to improve phosphorus efficiency in soil. “We are advocating for more innovation, more creativity and more urgency,” Li said.



The company’s product has shown remarkable results, reducing phosphorus runoff potential by 78% compared to conventional fertilizers.&nbsp;



Phospholutions is now expanding its technology across the Americas, Europe, and India, aiming to address phosphorus pollution on a global scale.



<h2 class="wp-block-heading" id="h-a-ddressing-soil-nutrient-loss">Addressing soil nutrient loss</h2>



The study highlights the urgent need for comprehensive strategies to address phosphorus loss.&nbsp;



With climate change exacerbating the problem, researchers call for a combination of advanced technologies and sustainable farming practices to mitigate the impacts on both <a href="https://www.earth.com/news/climate-and-agriculture-are-locked-in-a-destructive-feedback-loop/" target="_blank" rel="noreferrer noopener">agriculture</a> and aquatic ecosystems.



“The connection between water and land is essential, and that balance is growing increasingly fragile,” Li concluded.



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Soil nutrient loss due to heavy rainfall threatens agriculture 

Phosphorus, a crucial nutrient for soil fertility and life sustainability,...

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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



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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

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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;



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



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Flu viruses are more flexible than expected

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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;



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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

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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;



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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

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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;



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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

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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



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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

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The Cotahuasi Canyon in Peru is seen here in today’s Image of the Day from the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> . The Cotahuasi Canyon is one of the deepest in the world, measuring 1.5 to 2.2 miles deep, and formed over the course of millions of years as rivers and <a href="https://www.earth.com/news/melting-glaciers-ocean-floor/">glaciers</a> eroded the plateau. This image was captured by the Operational Land Imager (OLI) on board the Landsat 8 satellite.

The Cotahuasi Canyon in Peru

Melting tropical glaciers in Indonesia are seen here in today’s Image of the Day comes from the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> and features a look at melting tropical glaciers in New Guinea, part of the Papua province of <a href="https://www.earth.com/news/reconstruction-tsunami-social-divide/">Indonesia</a>. This image was captured by the Operational Land Imager (OLI) on board the Landsat 8 satellite.