Today's Image of the Day from the European Space Agency features the Eagle Nebula, also known as Messier 16, which is located about 7,000 light-years away in the constellation Serpens.



The Eagle Nebula is one of the most iconic star-forming regions in our galaxy. It’s a vast cloud of gas and dust stretching roughly 70 light-years across. 



<h2 class="wp-block-heading" id="h-pillars-of-creation-nbsp">Pillars of Creation&nbsp;</h2>



What makes it especially famous is a portion of the <a href="https://www.earth.com/news/six-rogue-worlds-discovered-inside-a-young-star-forming-nebula/">nebula</a> captured by the Hubble Space Telescope in 1995 - an area called the "Pillars of Creation."&nbsp;



Some of these towering columns of gas are several light-years tall. The towers resemble sculpted fingers reaching out into space. Inside these pillars, new <a href="https://www.earth.com/news/serpens-nebula-image-reveals-how-stars-are-born/">stars</a> are being born as gravity pulls material together into dense cores that eventually ignite nuclear fusion.



The Pillars of Creation are often cited as a poetic example of the cosmic cycle of birth and destruction - where new stars are born even as the surrounding material is slowly destroyed by radiation.



<h2 class="wp-block-heading" id="h-hubble-image-of-the-eagle-nebula-nbsp">Hubble image of the Eagle Nebula&nbsp;</h2>



“This towering structure of billowing gas and dark, obscuring dust might only be a small portion of the Eagle Nebula, but it is no less majestic in appearance for it,” said <a href="https://esahubble.org/images/heic2507a/">ESA</a>.



“The new Hubble image is part of ESA/Hubble’s 35th anniversary celebrations. The cosmic cloud shown here is made of cold hydrogen gas, like the rest of the Eagle Nebula. In such regions of space new stars are born among the collapsing clouds.”&nbsp;



The hot, energetic stars emit intense ultraviolet light and powerful stellar winds that erode and sculpt the surrounding gas. The result is the creation of fantastical structures - like the narrow pillar with a blossoming head featured in the new image.



<h2 class="wp-block-heading" id="h-light-and-shadow-in-the-eagle-nebula">Light and shadow in the Eagle Nebula</h2>



The thick material in the pillar blocks most light, appearing dark and heavy against the backdrop. However, its edges glow where light from the more distant nebula shines through.&nbsp;



The striking colors reflect the chemistry and physics at play: blues signal ionized oxygen, reds indicate glowing hydrogen, and orange shows where starlight has managed to pierce the dust.



<h2 class="wp-block-heading" id="h-a-structure-under-siege">A structure under siege</h2>



Just out of frame lie the very stars responsible for shaping this dramatic pillar. Their radiation and winds continue to batter the cloud, compressing the gas and potentially triggering the birth of even more stars within.



For now, the pillar holds firm, but this stability is temporary. Over time, the relentless energy from newly formed <a href="https://www.earth.com/news/fluffy-molecular-clouds-may-change-our-understanding-of-star-formation/">stars</a> will eventually erode the entire structure.



“While the starry pillar has withstood these forces well so far, cutting an impressive shape against the background, eventually it will be totally eroded by the multitude of new stars that form in the Eagle Nebula,” explained ESA.



<h2 class="wp-block-heading" id="h-life-cycle-of-the-milky-way">Life cycle of the Milky Way</h2>



The nebula’s location in the Sagittarius Arm - one of the Milky Way’s major spiral arms - places it in a zone bustling with similar star-forming regions. This highlights the role of the Eagle Nebula in shaping the structure and the future of our galaxy.



Studies of the Eagle Nebula have revealed that the region is rich in young, hot stars - some of which are only a few million years old. These stars are in various stages of development, providing a natural laboratory for astronomers to study stellar life cycles.&nbsp;



<h2 class="wp-block-heading" id="h-evolution-of-the-eagle-nebula-nbsp">Evolution of the Eagle Nebula&nbsp;</h2>



Within the Eagle Nebula, there is a variety of stellar processes occurring in close proximity. Some stars are still forming within dense clouds of gas, while others have already matured and begun to emit powerful ultraviolet radiation.&nbsp;



The ongoing interaction between <a href="https://www.earth.com/news/star-formation-reignited-in-the-galaxy-leo-p-after-billions-of-years/">young stars</a> and their environment drives the evolution of the nebula itself.&nbsp;



As newly formed stars heat and disperse the gas and dust around them, they trigger further waves of star formation - or in some cases, halt it altogether.&nbsp;



This feedback loop not only influences the pace of star birth in the Eagle Nebula but also contributes to the broader life cycle of matter within the <a href="https://www.earth.com/news/milky-way-collision-may-change-everything-we-know-about-our-galaxy/">Milky Way</a>, enriching the galaxy with heavier elements forged in stellar cores.



Image Credit: ESA/Hubble &amp; NASA, K. Noll



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Eagle Nebula: Carving light from darkness

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

Today's Image of the Day from the European Space Agency features a portion of the Rosette Nebula, captured by the Hubble Space Telescope.



The Rosette Nebula is a vast cloud of gas and dust located in the constellation Monoceros, also known as the Unicorn.



Shaped like a blooming rose in deep space, it lies about 5,200 light-years from Earth and spans roughly 100 light-years in diameter.&nbsp;



<h2 class="wp-block-heading" id="h-image-of-the-rosette-nebula">Image of the Rosette Nebula </h2>



“<a href="https://www.earth.com/news/35-years-of-hubble-the-telescope-that-changed-our-view-of-the-universe/" target="_blank" rel="noreferrer noopener">Hubble</a> zooms into a small portion of the nebula that is only four light-years across (the approximate distance between our Sun and the neighboring Alpha Centauri star system),” noted <a href="https://www.esa.int/ESA_Multimedia/Images" target="_blank" rel="noreferrer noopener">ESA</a>.



“Dark clouds of hydrogen gas laced with dust are silhouetted across the image. The clouds are being eroded and shaped by the seething radiation from the cluster of larger stars in the center of the nebula.”&nbsp;



“An embedded star seen at the tip of a dark cloud in the upper right portion of the image is launching jets of plasma that are crashing into the cold cloud around it. The resulting shock wave is causing a red glow. The colors come from the presence of hydrogen, oxygen, and nitrogen.”



<h2 class="wp-block-heading" id="h-distinct-appearance-of-rosette">Distinct appearance of Rosette</h2>



Stellar winds and ultraviolet light are gradually carving out a cavity in the nebula’s center while simultaneously triggering new waves of <a href="https://www.earth.com/news/fluffy-molecular-clouds-may-change-our-understanding-of-star-formation/" target="_blank" rel="noreferrer noopener">star formation</a> along its dense edges.&nbsp;



The Rosette Nebula is often studied to understand the life cycle of stars and the complex interactions between radiation and interstellar material. 



Its intricate structure and visual appeal have made it a favorite target for both professional astronomers and astrophotographers.



<h2 class="wp-block-heading" id="h-nebulae-that-are-similar-to-rosette">Nebulae that are similar to Rosette</h2>



Compared to other famous nebulae, the Rosette Nebula stands out for its symmetry and floral appearance, which give it a distinct, iconic look. It's often compared to the Orion Nebula, which is much closer to Earth at about 1,300 light-years away and far brighter in the night sky. 



The <a href="https://www.earth.com/news/orion-nebula-destroys-an-oceans-worth-of-water-every-month/" target="_blank" rel="noreferrer noopener">Orion Nebula</a> is a bustling stellar nursery visible even to the naked eye, while the Rosette requires a telescope and is more diffuse and fainter despite being larger in actual size.



The Eagle Nebula, home to the famous "Pillars of Creation," shares a similar process of star formation and sculpting by radiation, but the Eagle has more dramatic, finger-like structures.&nbsp;



<h2 class="wp-block-heading" id="h-stellar-feedback-and-cosmic-evolution">Stellar feedback and cosmic evolution</h2>



The Lagoon Nebula and the Trifid Nebula, both in the constellation Sagittarius, also resemble the Rosette in that they are active star-forming regions, but they lie in a denser part of the <a href="https://www.earth.com/news/astronomers-found-something-strange-at-core-of-milky-way-galaxy-webb-meerkat/" target="_blank" rel="noreferrer noopener">Milky Way</a> and are often surrounded by a rich starfield.



What makes the Rosette Nebula particularly interesting scientifically is the clear interaction between its central star cluster and the surrounding gas, offering a textbook example of how massive stars influence their environment. 



It may not be as visually iconic as the Orion or as dynamic as the Eagle, but it's a beautiful and instructive example of stellar feedback and cosmic evolution.



<h2 class="wp-block-heading" id="h-history-of-the-rosette-nebula">History of the Rosette Nebula </h2>



The history of the Rosette Nebula, like many deep-sky objects, is a blend of observational discovery and increasing scientific understanding over time. 



Although it was likely spotted by earlier astronomers, its first documented observation was in the late 17th century by John Flamsteed, the first Astronomer Royal of England.&nbsp;



However, the <a href="https://www.earth.com/news/six-rogue-worlds-discovered-inside-a-young-star-forming-nebula/" target="_blank" rel="noreferrer noopener">nebula</a> itself was not fully recognized as a distinct object until the advent of astrophotography and improved telescopes in the 19th and 20th centuries.



<h2 class="wp-block-heading" id="h-star-clusters-of-the-enormous-cloud">Star clusters of the enormous cloud</h2>



The central star cluster, NGC 2244, was cataloged separately by William Herschel in the 18th century. Over time, astronomers realized that this cluster was embedded in a much larger, complex nebular structure.&nbsp;



As telescope technology advanced, astronomers identified several parts of the Rosette Nebula and gave them separate designations, including NGC 2237, NGC 2238, NGC 2239, and NGC 2246 - essentially referring to different regions of the same enormous cloud.



Observations from space-based telescopes like Chandra (X-rays) and Spitzer (infrared) helped map the energetic processes inside the nebula, revealing how radiation and stellar winds from NGC 2244 are triggering the birth of new stars in its surrounding regions.



Image Credit: ESA



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Rosette Nebula: A flower blooming in deep space

Today's Image of the Day from the European Space Agency features UGC 5460, a spiral galaxy that is located about 60 million light-years away in the constellation Ursa Major.&nbsp;



“This image combines four different wavelengths of light to reveal UGC 5460’s central bar of stars, winding spiral arms and bright blue star clusters. Also captured in the upper left-hand corner of this image is a far closer object: a star just 577 light-years away in our own galaxy,” said <a href="https://www.esa.int/ESA_Multimedia/Images" target="_blank" rel="noreferrer noopener">ESA</a>.



“UGC 5460 has hosted two recent supernovae named SN 2011ht and SN 2015as. It’s because of these two stellar explosions that Hubble targeted this galaxy, collecting data for three observing programmes that aim to study various kinds of supernovae.”&nbsp;



<h2 class="wp-block-heading" id="h-a-core-collapse-supernova-nbsp">A core-collapse supernova&nbsp;</h2>



SN 2015as is an example of a core-collapse supernova. This type of <a href="https://www.earth.com/news/supernova-explosions-could-damage-distant-planets/" target="_blank" rel="noreferrer noopener">supernova</a> occurs when the core of a massive star - typically with more than 8 times the mass of the sun - can no longer support its own gravity after exhausting its nuclear fuel. 



This causes the core to collapse under its own weight, leading to an extremely violent explosion. The collapse triggers the release of an enormous amount of energy, expelling the outer layers of the star into space.



In the aftermath of the explosion, a dense <a href="https://www.earth.com/news/shockingly-bright-carbon-monoxide-detected-in-supernova-remnant/" target="_blank" rel="noreferrer noopener">remnant</a> is created. This is often a neutron star or black hole, depending on the mass of the original star. Core-collapse supernovae are some of the most powerful events in the universe.



According to ESA, Hubble observations of SN 2015as will help researchers understand what happens when the expanding shockwave of a <a href="https://www.earth.com/news/supernova-dandelion-year-1181-leaves-behind-zombie-star-defying-death/" target="_blank" rel="noreferrer noopener">supernova</a> collides with the gas that surrounds the exploded star.



<h2 class="wp-block-heading" id="h-rare-stars-with-large-eruptions-nbsp">Rare stars with large eruptions&nbsp;</h2>



“SN 2011ht might have been a core-collapse supernova as well, but it could also be an impostor called a luminous blue variable. Luminous blue variables are rare stars that experience eruptions so large that they can mimic supernovae,” noted ESA.



“Crucially, luminous blue variables emerge from these eruptions unscathed, while stars that go supernova do not. Hubble will search for a stellar survivor at SN 2011ht’s location, and the explosion’s identity may be revealed at last.”



<h2 class="wp-block-heading" id="h-what-is-a-spiral-galaxy">What is a spiral galaxy?</h2>



Spiral galaxies are some of the most recognizable and beautiful structures in the universe. They are known for their distinctive arms that spiral outward from a central bulge.&nbsp;



These galaxies are typically composed of stars, gas, dust, and dark matter. The arms are often sites of intense <a href="https://www.earth.com/news/fluffy-molecular-clouds-may-change-our-understanding-of-star-formation/" target="_blank" rel="noreferrer noopener">star formation</a>, where clouds of gas collapse to form new stars. 



In the center of a spiral galaxy lies a dense concentration of older stars and, often, a supermassive black hole.



<h2 class="wp-block-heading" id="h-structure-of-a-spiral-galaxy-nbsp">Structure of a spiral galaxy&nbsp;</h2>



The structure of a spiral galaxy is generally divided into three main components: the disk, the bulge, and the halo.&nbsp;



The disk is where the spiral arms are located and contains most of the galaxy's visible stars and interstellar medium.&nbsp;



The bulge is a tightly packed region of older stars at the core, and the halo consists of a sparse collection of stars and globular clusters that surround the galaxy.&nbsp;



Spiral galaxies can be classified into different types based on the tightness and number of their spiral arms, as well as the size of their central bulge.



<h2 class="wp-block-heading" id="h-the-milky-way-galaxy">The Milky Way galaxy</h2>



Our solar system is located within a large spiral galaxy known as the Milky Way. The name refers to its appearance as a dim, milky band of light stretching across the night sky.&nbsp;



The term "Milky Way" comes from ancient Greek mythology, where it was associated the goddess Hera's milk spilling into the sky. In Greek, it was called "Galaxias Kyklos," meaning "milky circle."&nbsp;



Spanning about 100,000 light-years in diameter, the Milky Way is composed of stars, gas, dust, and dark matter. The galaxy has a distinct disk shape with spiral arms that wind outward from a central bulge, which houses a supermassive <a href="https://www.earth.com/news/milky-ways-black-hole-unleashes-mysterious-flares/" target="_blank" rel="noreferrer noopener">black hole</a>. 



Our sun is located in one of the spiral arms - known as the Orion Arm - positioned roughly halfway from the center to the outer edge.&nbsp;



The Milky Way is part of a small group of galaxies called the Local Group, which includes the Andromeda Galaxy and several smaller galaxies.



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Hubble views a spiral galaxy with stellar explosions

Today's Image of the Day from NASA Earth Observatory features Lake Chad in central Africa. The photograph was taken by an astronaut aboard the International Space Station.



According to <a href="https://earthobservatory.nasa.gov/images/154407/lake-chads-water-wetlands-and-dunes" target="_blank" rel="noreferrer noopener">NASA</a>, Lake Chad once ranked among the largest natural lakes in the world. It was a critical resource for millions of people and animals, supporting agriculture and fishing across the region.&nbsp;



Lake Chad straddles the borders of Chad, Nigeria, Niger, and Cameroon. The shallow <a href="https://www.earth.com/news/lakes-are-warming-toward-the-point-of-no-return/" target="_blank" rel="noreferrer noopener">lake</a> is primarily fed by the Chari River, which brings water from the Central African Republic. 



The water levels are also influenced by seasonal rainfall. The rainfall patterns vary significantly across the basin but generally follow a wet-dry seasonal cycle.



<h2 class="wp-block-heading" id="h-environmental-decline-and-shrinkage-nbsp">Environmental decline and shrinkage&nbsp;</h2>



From the 1960s to the early 2000s, the lake lost more than 90 percent of its surface area. It transformed from a vast expanse of open water into a patchwork of wetlands, reed beds, and scattered pools.&nbsp;



This environmental decline has had severe consequences for local communities, leading to food and <a href="https://www.earth.com/news/global-water-security-relies-on-the-origins-of-rainfall/" target="_blank" rel="noreferrer noopener">water insecurity</a>, loss of livelihoods, and increasing competition over scarce resources.



“Ongoing droughts and the rising demand for fresh water have shrunk the lake to less than a tenth of the area it covered in the middle of the last century,” noted NASA.



“Although the lake has experienced dry and wet periods for thousands of years, there has been a significant decline in the amount of lake water available since the 1960s.”



<h2 class="wp-block-heading" id="h-conflict-culture-and-economy">Conflict, culture, and economy</h2>



Lake Chad is a geopolitical hotspot. The region has been affected by conflict, including the insurgency led by Boko Haram, which has displaced millions and further complicated efforts to manage and protect the lake’s fragile ecosystem.&nbsp;



Despite these challenges, regional governments and international organizations are working to restore and sustain the lake, including ambitious proposals to divert water from the Congo River basin.



Culturally and economically, Lake Chad remains vital. It is a hub for trade and social exchange among diverse ethnic groups and continues to provide fish and fertile land despite its reduced size.&nbsp;



The future of Lake Chad hinges on sustainable water management, <a href="https://www.earth.com/news/climate-extremes-alter-how-sunlight-travels-through-clear-lakes/" target="_blank" rel="noreferrer noopener">climate</a> resilience, and political cooperation across national boundaries.



<h2 class="wp-block-heading" id="h-evolution-of-lake-chad-nbsp">Evolution of Lake Chad&nbsp;</h2>



According to NASA, the evolution of Lake Chad has been documented by astronaut photography over the past 60 years.&nbsp;



“During the Apollo 7 mission in 1968, an astronaut acquired an oblique <a href="https://eol.jsc.nasa.gov/SearchPhotos/photo.pl?mission=AS07&amp;roll=8&amp;frame=1932" target="_blank" rel="noreferrer noopener">photograph</a> of the lake as one large body of water. In 1982, another <a href="https://eol.jsc.nasa.gov/SearchPhotos/photo.pl?mission=STS005&amp;roll=39&amp;frame=1022" target="_blank" rel="noreferrer noopener">photo</a> from the space shuttle mission STS-5 recorded receding water levels and encroaching sand dunes.”



“A <a href="https://eol.jsc.nasa.gov/SearchPhotos/photo.pl?mission=ISS042&amp;roll=E&amp;frame=244403" target="_blank" rel="noreferrer noopener">photo</a> taken in 2015 during space station Expedition 42 captured the lake’s remaining waters and wetlands in dark green, blue, and brown, contrasting with the sandy shades of the surrounding land.”&nbsp;



<h2 class="wp-block-heading" id="h-wildlife-of-lake-chad">Wildlife of Lake Chad</h2>



Lake Chad still supports wildlife, though species diversity and abundance have declined significantly due to ecosystem degradation



The lake and its surrounding wetlands are home to several species of fish, including tilapia, catfish, and Nile perch, which are important both ecologically and economically.&nbsp;



These fish support a major regional fishing industry, although overfishing and changes in water conditions have put pressure on fish populations.



Birds are another key component of the ecosystem. The lake serves as a crucial habitat and stopover point for <a href="https://www.earth.com/news/birds-may-be-using-quantum-physics-for-migration/" target="_blank" rel="noreferrer noopener">migratory birds</a> traveling along the African-Eurasian flyway. 



Species such as herons, storks, ducks, and geese can be found in the region, especially during the wet season when parts of the lake flood and create rich feeding grounds.



Mammals that depend on the surrounding floodplains and wetlands include hippos and various antelope species, yet their numbers have declined.&nbsp;



<h2 class="wp-block-heading" id="h-conservation-efforts-and-challenges">Conservation efforts and challenges</h2>



Reptiles like Nile crocodiles and turtles also inhabit the lake's waters and marshy areas. In the past, larger wildlife such as elephants and lions may have roamed the wider Lake Chad basin, but they are now mostly gone from the immediate lake area due to habitat loss and human activity.



Despite these challenges, Lake Chad remains an important, yet increasingly fragile, refuge for wildlife in a region where water and natural habitats are becoming more scarce.&nbsp;



Conservation efforts aim to balance the needs of people and <a href="https://www.earth.com/news/thousands-of-freshwater-species-are-threatened-with-extinction/" target="_blank" rel="noreferrer noopener">wildlife</a>, but the success of such efforts depends on managing the lake’s limited resources in the face of climate change, political instability, and population growth.



Image Credit: NASA Earth Observatory&nbsp;



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Lake Chad: A vanishing lifeline in Central Africa

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

Today's Image of the Day from the European Space Agency features NGC 5335 - a barred spiral galaxy located in the constellation Virgo. 



The photo was captured by the Hubble Space Telescope. According to <a href="https://www.esa.int/ESA_Multimedia/Images/2025/04/Barred_Spiral_Galaxy_NGC_5335" target="_blank" rel="noreferrer noopener">ESA</a>, thousands of distant galaxies are speckled throughout the image in a variety of colors.&nbsp;



Hubble is revealing how <a href="https://www.earth.com/news/hidden-galaxies-discovery-would-upend-current-understanding-of-universe/" target="_blank" rel="noreferrer noopener">galaxies</a> form, grow, and evolve over cosmic time by capturing detailed images of galaxies at various stages of development, from the nearby universe to billions of light-years away. 



Hubble images have shown us that galaxies collide and merge, that star formation varies across different types of galaxies, and that supermassive black holes often lie at their centers.



<h2 class="wp-block-heading" id="h-studying-ngc-5335">Studying NGC 5335</h2>



The galaxy NGC 5335 lies approximately 160 million light-years from Earth. It is classified as an SB(s)bc type galaxy, indicating a well-defined bar structure across its center with less distinct spiral arms. The galaxy was discovered by astronomer William Herschel on May 13, 1793.&nbsp;



Like many galaxies of its type, NGC 5335 features active <a href="https://www.earth.com/news/star-formation-reignited-in-the-galaxy-leo-p-after-billions-of-years/" target="_blank" rel="noreferrer noopener">star formation</a>, especially in its spiral arms, where interstellar gas and dust provide the raw material for new stars.&nbsp;



Observations in different wavelengths, including infrared and ultraviolet, help astronomers study its stellar population and the dynamics of its central bar.



<h2 class="wp-block-heading" id="h-hubble-s-view-of-the-spiral-galaxy-nbsp">Hubble’s view of the spiral galaxy&nbsp;</h2>



“NGC 5335 is categorized as a flocculent spiral galaxy with patchy streamers of star formation across its disk. There is a striking lack of well-defined spiral arms that are commonly found among galaxies, including our Milky Way,” noted ESA.



“A notable bar structure slices across the center of the galaxy. The bar channels gas inwards toward the galactic center, fueling star formation.”&nbsp;



“Such bars are dynamic in galaxies and may come and go over two-billion-year intervals. They appear in about 30 percent of observed galaxies, including our Milky Way.”



<h2 class="wp-block-heading" id="h-galactic-bar-in-the-milky-way-nbsp">Galactic bar in the Milky Way&nbsp;</h2>



The bar in the <a href="https://www.earth.com/news/astronomers-found-something-strange-at-core-of-milky-way-galaxy-webb-meerkat/" target="_blank" rel="noreferrer noopener">Milky Way</a> is a vast, elongated structure composed mostly of stars, stretching across the galaxy’s central region. It is a key feature of our galaxy’s architecture, spanning about 27,000 light-years and oriented at an angle relative to the galaxy’s spiral arms.&nbsp;



Astronomers believe the bar plays a crucial role in the dynamics and evolution of the Milky Way by funneling gas inward toward the galactic center. This can feed star formation and fuel the supermassive black hole at the core. 



The bar is thought to have formed from instabilities in the galactic disk and continues to influence the motion of stars and the overall gravitational balance of the galaxy.&nbsp;



Observations in infrared and radio wavelengths, which can pierce through the dust in the galactic plane, have helped scientists map the bar’s size, shape, and orientation.



<h2 class="wp-block-heading" id="h-the-constellation-virgo-nbsp">The constellation Virgo&nbsp;</h2>



Virgo is one of the most prominent and well-known constellations in the night sky, both astronomically and mythologically. It is the second-largest constellation by area and lies along the zodiac, making it one of the twelve constellations through which the <a href="https://www.earth.com/news/team-creates-video-showing-the-sun-in-gamma-rays-over-a-14-year-period/" target="_blank" rel="noreferrer noopener">Sun</a> appears to move during the year.&nbsp;



Virgo is most visible in the evening sky in the Northern Hemisphere during spring, particularly in April and May. Its name means “virgin” in Latin.



Virgo is traditionally associated with various fertility and agriculture goddesses across different cultures, including the Greek goddess Demeter and her daughter Persephone, as well as the Roman goddess Ceres.&nbsp;



In some myths, Virgo represents Astraea, the virgin goddess of justice who fled to the heavens during the corruption of mankind.



<h2 class="wp-block-heading" id="h-astronomical-significance-of-virgo">Astronomical significance of Virgo</h2>



Astronomically, Virgo is situated between Leo to the west and Libra to the east. One of its most notable stars is Spica, the brightest star in Virgo and one of the brightest in the night sky.&nbsp;



Spica is a blue-white giant, located approximately 250 light-years from <a href="https://www.earth.com/news/was-early-earth-a-purple-planet-scientists-say-its-possible/" target="_blank" rel="noreferrer noopener">Earth</a>. It has been important for navigation and agriculture for centuries, marking planting and harvest times in ancient calendars.



Virgo is also of great interest to astronomers because it hosts the Virgo Cluster, a massive cluster of galaxies about 65 million light-years away.&nbsp;



This cluster contains more than 1,000 galaxies, and it's part of the larger Virgo Supercluster, which also includes our own Local Group of galaxies. This makes Virgo a key area for studying large-scale structures in the universe.



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Barred spiral galaxy glows in the constellation Virgo

Flour,Chickpeas,In,Spoonful,,Chick-peas,In,A,Sack,And,Fresh

For decades, studies on mice, monkeys, and even roundworms have pointed to calorie restriction as a ticket to longevity. Trouble is, perpetual hunger does not rank high on most bucket lists, and adherence to such strict diets tends to plummet once real life barges in with birthdays and barbecues.



By the time researchers at the <a href="https://www.wisc.edu/" target="_blank" rel="noreferrer noopener">University of Wisconsin</a> put calorie-cutting under the microscope, they noticed a pattern: eating less helped animals live longer, but the menu’s makeup mattered just as much. 



That discovery widened the spotlight to proteins, the nutrients stitched together from 20 common <a href="https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/amino-acids" target="_blank" rel="noreferrer noopener">amino acids</a>. Nine of those are “essential,” meaning the body cannot manufacture them.



Early work hinted that dialing down total protein might mirror the benefits of calorie restriction without the gnawing hunger. 



Mice fed modest protein saw improved <a href="https://www.earth.com/news/drinking-this-amount-of-water-per-day-helps-control-blood-sugar-levels-in-people-with-diabetes/">blood sugar</a> control and trimmer waistlines, yet blanket reductions risked muscle loss, especially in older animals. Something more surgical was needed.



<h2 class="wp-block-heading" id="h-protein-quality-over-quantity">Protein quality over quantity</h2>



Metabolism researcher <a href="https://www.medicine.wisc.edu/directory/lamming_dudley" target="_blank" rel="noreferrer noopener">Dudley Lamming</a> stepped into that gap with a question few had asked: what if the magic hides in specific amino acids rather than protein as a whole? 



“We like to say a calorie is not just a calorie,” he says. “Different components of your diet have value and impact beyond their function as a calorie, and we’ve been digging in on one component that many people may be eating too much of.”



His team homed in on the branched-chain amino acids - <a href="https://www.earth.com/news/eating-too-much-protein-greatly-increases-heart-disease-risk/">leucine</a>, isoleucine, and <a href="https://www.earth.com/news/plants-use-dna-duplication-to-increase-their-resilience/">valine</a> - popular in sports supplements for their muscle-building buzz. Instead of treating them as a block, the researchers isolated each one. Isoleucine quickly took center stage.



<h2 class="wp-block-heading" id="h-cutting-back-on-isoleucine">Cutting back on isoleucine</h2>



When mice at the equivalent of 30 human years were fed chow that cut isoleucine by about two-thirds, their bodies shed fat quickly. 



“Very quickly, we saw the mice on the reduced-isoleucine diet lose adiposity - their bodies got leaner, they lost fat,” says Lamming. 



<a href="https://www.earth.com/news/spicy-foods-can-slow-down-eating-and-cut-calorie-intake/">Calorie intake</a> actually climbed; the animals nibbled more in an apparent effort to find the missing amino acid, yet their metabolisms revved high enough to keep weight off.



Over time, male mice lived about 33 percent longer, and females about 7 percent. 



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/06/isoleucine_amino-acid_diet-restriction_lifespan-increase_credit-Cell-Metabolism_1m.jpg"><img src="https://www.earth.com/wp-content/uploads/2025/06/isoleucine_amino-acid_diet-restriction_lifespan-increase_credit-Cell-Metabolism_1s.webp" alt="This graphic illustration shows the impact that reduced isoleucine diet had on mice longevity. Credit: Cell Metabolism" class="wp-image-1975852"/></a><figcaption class="wp-element-caption">This graphic illustration shows the impact that reduced isoleucine diet had on mice longevity. Click image to enlarge. Credit: Cell Metabolism</figcaption></figure>



That extra runway arrived with smoother blood sugar curves, sturdier muscles, and fewer signs of frailty across 26 health checks - from grip strength to coat condition. 



Cancer, the usual culprit in an aging mouse colony, struck less often in males on the low-isoleucine diet, and prostate enlargement eased.



<h2 class="wp-block-heading" id="h-how-isoleucine-shapes-lifespan">How isoleucine shapes lifespan</h2>



Most roads in the aging field eventually intersect with <a href="https://www.nature.com/articles/s41392-023-01608-z" target="_blank" rel="noreferrer noopener">mTOR</a>, a cellular sensor finely tuned to amino acid levels. 



Drop isoleucine, and mTOR quiets down, dialing back growth signals that drive both tumor formation and the wear-and-tear of aging. 



The diet also boosts a hormone that helps the body cope with cold and is being studied as a potential diabetes therapy. 



The interplay of these pathways - not yet fully mapped - likely explains why trimming one nutrient outperforms broader protein cuts in middle-aged mice.



“Previous research has shown lifespan increase with low-calorie and low-protein or low-amino-acid diets starting in very young mice,” Lamming explains.



“We started with mice that were already getting older. It’s interesting and encouraging to think a dietary change could still make such a big difference in lifespan and what we call ‘healthspan,’ even when it started closer to mid-life.”



<h2 class="wp-block-heading" id="h-isoleucine-and-human-health">Isoleucine and human health</h2>



Humans need isoleucine for everything from <a href="https://www.earth.com/news/tibetan-women-have-quickly-evolved-to-thrive-in-low-oxygen-and-high-altitudes/">hemoglobin production</a> to immune defense, so eliminating it is off the table. 



The wrinkle is that many Western diets supply far more than the daily requirement, thanks to eggs, cheese, soy isolates, chicken, and beef featuring heavily on menus. 



Surveys from Wisconsin echo national data: people with higher body-mass indexes often report higher isoleucine intake.



“We can’t just switch everyone to a low-isoleucine diet,” Lamming continued. “But narrowing these benefits down to a single amino acid gets us closer to understanding the biological processes and maybe potential interventions for humans, like an isoleucine-blocking drug.”



The team’s nutritional modeling suggests that choosing more fruits, vegetables, and modest portions of animal protein can shave isoleucine totals without complicated meal plans.



<h2 class="wp-block-heading" id="h-human-trials-come-next">Human trials come next</h2>



Because the study relied on a genetically diverse strain of mice - much closer to human variety than lab inbreds - confidence is higher that the findings translate. 



Yet controlled human trials are still required. Researchers are now exploring whether temporary isoleucine dips, similar to the popular five-day <a href="https://www.earth.com/news/alternate-day-fasting-might-be-worth-trying-for-weight-loss/">fasting-mimicking diet</a>, can trigger the same metabolic perks without long-term restriction.



“It could be that by choosing healthier foods and healthier eating in general, we might be able to lower isoleucine enough to make a difference,” Lamming surmised.



While clinicians wait for definitive guidance, nutritionists already recommend leaning on <a href="https://www.earth.com/news/mixed-cover-crops-may-be-the-future-of-sustainable-farming/">legumes, whole grains, and vegetables</a>, which naturally carry less isoleucine than dairy or red meat. That shift dovetails with broader public-health advice to curb chronic disease risk.



<h2 class="wp-block-heading" id="h-eat-right-feel-good-live-longer">Eat right, feel good, live longer</h2>



To sum it all up, living longer has always hinged on a balance between what bodies need and what wears them out. 



The latest evidence suggests that tipping the scales away from a single amino acid might buy extra years without sacrificing satisfaction at the table. 



Turning lab findings into dinner-plate habits won’t happen overnight, but the path is far clearer now than when the conversation started with simply “eat less.”



These full studies were published in the journals <a href="https://www.cell.com/cell-metabolism/fulltext/S1550-4131(23)00374-1" target="_blank" rel="noreferrer noopener">Cell Metabolism</a> and <a href="https://www.nature.com/articles/s43587-024-00744-7" target="_blank" rel="noreferrer noopener">Nature Aging</a>.



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Removing this one thing from your diet could dramatically increase lifespan

For decades, studies on mice, monkeys, and even roundworms have...

In a fascinating new study, scientists documented 34 attempts by wild killer whales to give food to humans. These rare cases spanned four oceans and 20 years. Some happened near boats, others in open water or even from the shore. 



The events highlight the <a href="https://www.earth.com/news/killer-whales-use-kelp-to-massage-and-groom-each-other/">orcas</a>’ possible interest in humans and raise important questions about whale intelligence, communication, and social behavior.



“Orcas often share food with each other - it’s a prosocial activity and a way that they build relationships with each other,” said study lead author Jared Towers, of <a href="https://baycetology.org" target="_blank" rel="noreferrer noopener">Bay Cetology</a> in British Columbia, Canada. “That they also share with humans may show their interest in relating to us as well.”



<h2 class="wp-block-heading" id="h-social-lives-of-killer-whales">Social lives of killer whales</h2>



Orcas live some of the most complex social lives in the animal kingdom. They stick together in tight-knit family groups called pods, usually led by an older matriarch. 



These family units aren’t just casual gatherings - they’re lifelong bonds. Calves stay with their mothers for life, swimming, hunting, and <a href="https://www.earth.com/news/photographer-captures-killer-whales-wearing-fish-hats/">playing together</a>. 



In some regions, pods form larger communities or clans that share unique vocal dialects, kind of like cultural accents passed down through generations. This tight social structure helps them coordinate during hunts and <a href="https://www.earth.com/news/killer-whales-use-kelp-to-massage-and-groom-each-other/">protect each other</a> from threats.



But it’s not all business. Orcas socialize for the joy of it too. They engage in what clearly looks like play - tossing kelp, breaching dramatically, or nudging one another during underwater games. 



They form friendships beyond their pods and even flirt, showing preferences and personalities. These interactions suggest that orcas have emotional lives and a sense of identity.



<h2 class="wp-block-heading" id="h-what-orcas-gave-humans">What orcas gave humans</h2>



The 34 incidents involved six distinct populations of killer <a href="https://www.earth.com/news/ai-helps-humans-have-20-minute-conversation-with-humpback-whale-named-twain/">whales</a>. They offered humans a total of 18 species: six fish, five mammals, three invertebrates, two birds, one reptile, and even one piece of seaweed.



In 97 percent of these cases, the orcas waited for a human response. Some hovered for several minutes. 



On several occasions, they tried again when the humans ignored or returned the offering. In two especially curious cases, whales retrieved birds after humans returned them, only to offer them again.



This behavior could be a form of interspecies curiosity, communication, or even social learning. As the authors suggest, these events might represent "generalized altruism" - an advanced trait observed in only a few social animals.



<h2 class="wp-block-heading" id="h-exploration-more-than-play">Exploration more than play</h2>



Though play was observed in 38 percent of the interactions, the researchers argue most cases were not playful. The age of the whales varied widely, and many offered whole, fresh prey. 



In over 75 percent of ignored cases, the whales later used the prey for themselves or their group. This suggests the offerings had purpose and value, not just entertainment.



Curiosity-driven behavior, distinct from play, seemed a stronger motivator. As the study explains, animals often explore to reduce uncertainty. 



Offering food to humans might help orcas learn how we respond, just as they would with unfamiliar members of their own <a href="https://www.earth.com/news/whales-blow-bubble-smoke-rings-near-humans-to-communicate/">species</a>.



<h2 class="wp-block-heading" id="h-deep-social-intelligence-at-work">Deep social intelligence at work</h2>



Some whales returned the same item to humans multiple times. Others acted in pairs or small groups. 



Most of the 34 events involved a single whale separating from a larger group. This suggests the act was not for show. Rather, it might reflect the whale's individual decision to interact.



Interestingly, killer <a href="https://www.earth.com/news/how-dolphin-brains-evolved-to-see-underwater-by-using-sound-echolocation/">whales</a> have also been documented cooperating with human fishers in places like Australia and Russia. The authors noted that this history could influence modern interactions, especially as human activity increases near their habitats.



<h2 class="wp-block-heading" id="h-whales-may-view-humans-as-companions">Whales may view humans as companions</h2>



Killer whales rank second only to humans in brain-to-body ratio. They also show advanced emotional and social behavior. 



These traits support complex social learning, reciprocal behavior, and possibly even empathy.



“Offering items to humans could simultaneously include opportunities for killer whales to practice learned cultural behavior, explore or play and in so doing learn about, manipulate or develop relationships with us,” the researchers wrote.



<h2 class="wp-block-heading" id="h-humans-should-not-approach-whales">Humans should not approach whales</h2>



Despite the remarkable nature of these encounters, the researchers urge caution. Orcas can show complex and sometimes unpredictable behavior. 



While no wild killer whale has killed a person, some interactions have been intense. They warn against seeking out such encounters or encouraging the behavior without proper permissions.



Most of these whales belonged to populations that hunt near the surface and share prey frequently. 



No deep-water, fish-only populations were involved. This suggests that cooperative surface hunting may lead to more frequent and visible interspecies interactions.



<h2 class="wp-block-heading" id="h-complex-minds-of-whales-and-humans">Complex minds of whales and humans</h2>



The findings challenge our assumptions about human-animal relationships. If orcas are experimenting with ways to relate to us, it means they recognize us not as threats, but as potential social partners.



These whales are not just predators. They are thinkers, observers, and maybe, in some way, explorers of culture, curiosity, memory, learning, and emotion. 



Their actions suggest complex minds in both whales and humans, capable of choice, empathy, and communication.



The study is published in the <a href="https://psycnet.apa.org/fulltext/2026-29805-001.html" target="_blank" rel="noreferrer noopener">Journal of Comparative Psychology</a>. 



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Killer whales are attempting to bond with humans, according to many observations

In a fascinating new study, scientists documented 34 attempts by...

Underwater volcanoes, in the area that is now South Africa, vented roughly 20,500 gigatons of carbon dioxide into the ocean-atmosphere system roughly 183 million years ago, crippling the oxygen cycle. 



Human activity between 1850 and 2019 has already pumped out about 2,390 gigatons of the gas. That’s 12 percent of the Jurassic total in less than two centuries.



<a href="https://www.gps.caltech.edu/people/francois-tissot" target="_blank" rel="noreferrer noopener">Professor François Tissot</a> of the California Institute of Technology studies what came next for the Jurassic seas and what it might tell us about the fate of today’s oceans.



<h2 class="wp-block-heading" id="h-sudden-loss-of-ocean-oxygen">Sudden loss of ocean oxygen</h2>



Bands of limestone from southern Italy record the <a href="https://www.sciencedirect.com/science/article/abs/pii/S0012825223003252" target="_blank" rel="noreferrer noopener">Toarcian Oceanic Anoxic Event</a> (T-OAE), a span when oxygen vanished from vast tracts of seawater and many marine species disappeared. 



During the event, only 6 to 8 percent of the seafloor lay under dead, oxygen-starved water. Yet that area was 28 to 38 times larger than today’s anoxic patches. 



“You can see lots of fossils within ocean sediments before the T‑OAE, and then suddenly they disappear,” said Tissot.



The <a href="https://www.sciencedirect.com/science/article/abs/pii/S0009254116305393" target="_blank" rel="noreferrer noopener">Karoo‑Ferrar</a> large igneous province triggered the event by pouring out vast amounts of carbon. It heated the planet, slowed ocean mixing, and altered chemistry enough to pull oxygen from the water.



The anoxic spell lasted roughly 300,000 to 500,000 years, eventually easing as volcanic pulses waned and natural feedbacks rebalanced carbon and <a href="https://www.earth.com/news/earths-oxygen-supply-may-have-been-kick-started-by-volcanoes/">oxygen cycles</a>.



<h2 class="wp-block-heading" id="h-carbon-disrupted-ocean-life">Carbon disrupted ocean life</h2>



Surging greenhouse gases warmed surface waters, strengthened stratification, and blocked the downward draw of fresh <a href="https://www.earth.com/news/dark-oxygen-discovery-deep-ocean-rocks-upends-centuries-of-scientific-beliefs/">oxygen</a>. 



Warmer water also holds less dissolved gas, so every degree of heating squeezed oxygen concentrations further.



Nutrient runoff from newly exposed volcanic ash likely spurred <a href="https://www.earth.com/news/green-algae-in-lake-erie-may-be-hiding-toxic-deadly-compounds/">algal blooms</a>. When that organic matter sank and decayed, it consumed even more oxygen in deeper layers.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/07/limestone-quarry_ancient-seabed_T-OAE-Map_credit-Tissot_1m.jpg"><img src="https://www.earth.com/wp-content/uploads/2025/07/limestone-quarry_ancient-seabed_T-OAE-Map_credit-Tissot_1s.webp" alt="Map of localities in which the T-OAE was previously recognized, along with our study site. Local anoxia refers to sites where redox proxy data reveal locally dysoxic to anoxic conditions. The site of the MSS is shown by the star in the Inset. KFCA-LIP: Karoo–Ferrar–Chon Aike Large Igneous Province. Credit: Tissot" class="wp-image-1976065"/></a><figcaption class="wp-element-caption">Map of localities in which the T-OAE was previously recognized, along with our study site. Local anoxia refers to sites where redox proxy data reveal locally dysoxic to anoxic conditions. The site of the MSS is shown by the star in the Inset. KFCA-LIP: Karoo–Ferrar–Chon Aike Large Igneous Province. Click image to enlarge. Credit: Tissot</figcaption></figure>



The result was anoxia, a chemically reduced state that favors the precipitation of once‑soluble uranium isotopes into sediments, leaving a measurable fingerprint for modern geochemists.



Scientists use those isotopes, preserved in carbonate grains, to reconstruct ocean redox conditions long after the water is gone.



<h2 class="wp-block-heading" id="h-tracing-ancient-ocean-oxygen-change">Tracing ancient ocean oxygen change</h2>



Tissot’s team combined 30 limestone samples with a <a href="https://www.publichealth.columbia.edu/news/what-bayesian-modeling" target="_blank" rel="noreferrer noopener">Bayesian model</a> built by <a href="https://www.gmu.edu/" target="_blank" rel="noreferrer noopener">George Mason University</a> researcher <a href="https://www.researchgate.net/scientific-contributions/Michael-A-Kipp-2118354679" target="_blank" rel="noreferrer noopener">Michael Kipp</a> to convert uranium data into the size of past anoxic zones. 



The model showed oxygen loss peaking just after the first volcanic pulse, then gradually recovering as emissions slowed.



Because uranium mixes uniformly in seawater, its isotopic shift offers a global view rather than a local snapshot, sidestepping problems that plague black shale studies in restricted basins. 



Independent work on molybdenum and thallium isotopes points to the same magnitude of <a href="https://www.earth.com/news/jurassic-extinction-may-hold-clues-about-our-oceans-future/">Jurassic</a> deoxygenation, reinforcing confidence in the carbonate method. Multiple tracers show how fast oceans can suffocate when carbon overwhelms natural buffers.



<h2 class="wp-block-heading" id="h-rock-preserved-ocean-memory">Rock preserved ocean memory</h2>



The limestones sampled from Mercato San Severino in Italy belong to a 5,000-foot-thick sequence of shallow-water carbonates. These were laid down on the southern edge of the ancient <a href="https://www.sciencedirect.com/science/article/pii/S0012825223002830" target="_blank" rel="noreferrer noopener">Tethys Ocean</a>. 



These deposits are ideal for capturing uranium isotope signals because they formed under well-oxygenated conditions and remained chemically stable over time.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/07/limestone-quarry_ancient-seabed_Mercato-San-Severino_credit-Tissot_1m.jpg"><img src="https://www.earth.com/wp-content/uploads/2025/07/limestone-quarry_ancient-seabed_Mercato-San-Severino_credit-Tissot_1s.webp" alt="A quarry illustrating bands of stratified limestone from the ancient seafloor in what is now Mercato San Severino in Italy. Credit: F. Tissot" class="wp-image-1976063"/></a><figcaption class="wp-element-caption">A quarry illustrating bands of stratified limestone from the ancient seafloor in what is now Mercato San Severino in Italy. Click image to enlarge. Credit: F. Tissot</figcaption></figure>



Geochemical screening confirmed the rocks remained largely unaltered after burial. Isotope ratios, trace elements, and sediment structure all supported the conclusion that these limestones faithfully recorded seawater chemistry from the time of deposition.



<h2 class="wp-block-heading" id="h-today-s-waters-mirror-the-past">Today's waters mirror the past</h2>



Modern measurements show that only about 0.2 percent of the seafloor is overlain by permanently anoxic water, mostly in marginal seas like the Black Sea. 



Yet the global inventory of dissolved oxygen has already fallen by roughly 2 percent since 1960. “Oxygen concentrations in both the open ocean and coastal waters have been declining since at least the middle of the 20th century,” said marine ecologist <a href="https://serc.si.edu/staff/denise-breitburg/breitburgd9302003?sort_bef_combine=field_pub_date_value%20ASC&amp;page=3" target="_blank" rel="noreferrer noopener">Denise Breitburg</a>.



A 2024 <a href="https://www.nature.com/articles/s41467-024-52197-6">study</a> warned that deoxygenation will accelerate this century as warming and stratification intensify. If emissions rise, mid-depth zones could lose 20 percent of oxygen by 2100, exceeding many species’ physiological limits.



Dead zones already plague more than 400 estuaries worldwide, harming fisheries and coastal economies and hinting at larger changes offshore.



<h2 class="wp-block-heading" id="h-action-needed-before-oceans-suffocate">Action needed before oceans suffocate </h2>



Past events show that once widespread anoxia takes hold, recovery can take tens of thousands of years even after carbon input stops. 



Unlike volcanic outbursts, human emissions are continuous and tightly linked to energy and food systems, making a quick cutoff challenging. 



Cutting fossil fuel use, protecting carbon‑storing ecosystems, and curbing nutrient runoff can slow oxygen loss before feedback amplifies the trend.



Satellites, autonomous floats, and seafloor sensors now track oxygen in near real time. This gives policymakers a chance to act before thresholds comparable to the <a href="https://www.earth.com/news/jurassic-rocks-reveal-new-details-about-earths-climate-system/">Jurassic</a> pulse are crossed.



Tissot’s limestone cores remind us that the ocean’s memory is long and its tolerance finite.



The study is published in <a href="https://www.pnas.org/doi/10.1073/pnas.2406032121" target="_blank" rel="noreferrer noopener">Proceedings of the National Academy of Sciences</a>.



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What happened in the ocean millions of years ago could happen again today

Underwater volcanoes, in the area that is now South Africa,...

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 The science of aging Today&#8217;s Video of the Day from the <a href="https://www.salk.edu/">Salk Institute</a> investigates how we age, why we age, and how aging affects our cognitive function. 
Aging is one of the biggest risk factors for the most prevalent diseases, including diabetes, obesity, and heart disease. In numerous diseases, age itself is the major risk factor. Cancer, Alzheimer’s, heart disease and many other afflictions become profoundly more likely the older we get. Aside from extending our life spans, scientists want to know how we can also extend our health during advanced age.
The Salk scientists want to understand how cells and tissues change over the course of a lifetime. 
By comparing the biological aging rate of individuals with the same chronological age, the researchers hope to identify the mechanisms which allow some people to maintain health throughout life while others are not able to do so. While one important area of study in the field of aging involves studying telomeres in dividing cells, the body is full of cells that seldom replicate, such as those in the brain, heart, bones and pancreas. These long-lived cells have different pathways of aging, and must protect their DNA from damage and threats. 
Video Credit: Salk Institute 
&#8211;&#8212;
By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

The science of aging

News coming your way