Today's Image of the Day from the European Space Agency features the spiral galaxy NGC 5643, which is located roughly 40 million light-years away in the constellation Lupus.&nbsp;



NGC 5643 belongs to the Hubble classification SBc, indicating that it is a barred spiral galaxy with loosely wound arms.&nbsp;



Its orientation, nearly face-on to Earth, provides astronomers with an exceptional view of its detailed spiral structure and central bar.



<h2 class="wp-block-heading" id="h-ngc-5643-a-grand-design-spiral-nbsp">NGC 5643: A grand design spiral&nbsp;</h2>



“NGC 5643 is what’s known as a grand design spiral, referring to how the galaxy’s two large, winding spiral arms are clear to see,” noted <a href="https://www.esa.int/ESA_Multimedia/Images">ESA</a>. “The spiral arms are defined by bright blue stars, lacy reddish-brown dust clouds and pink star-forming regions.”



“As fascinating as the galaxy appears at visible wavelengths, some of NGC 5643’s most interesting features are invisible to the human eye.”&nbsp;



<h2 class="wp-block-heading" id="h-intense-activity-in-ngc-5643">Intense activity in NGC 5643</h2>



This galaxy is notable for its Seyfert 2 nucleus, a type of active galactic nucleus (AGN). The intense activity in its core is powered by a supermassive <a href="https://www.earth.com/news/awakening-of-a-black-hole-witnessed-for-the-first-time/">black hole</a> that accretes surrounding material, emitting energy across a wide range of wavelengths.&nbsp;



“When a supermassive black hole ensnares gas from its surroundings, the gas collects in a disc that heats up to hundreds of thousands of degrees. The superheated gas shines brightly across the electromagnetic spectrum, but especially at X-ray wavelengths,” said ESA.



Observations have revealed jets and outflows of material emanating from the nucleus, likely driven by the black hole’s activity.&nbsp;



NGC 5643’s AGN has been studied extensively for its role in galactic evolution, particularly in how its energetic processes interact with the galaxy’s interstellar medium.



<h2 class="wp-block-heading" id="h-the-mystery-of-ngc-5643-x-1">The mystery of NGC 5643 X-1</h2>



ESA pointed out that NGC 5643’s active galactic nucleus isn’t the brightest source of X-rays in the galaxy. 



“Researchers using ESA’s XMM-Newton discovered an even brighter X-ray-emitting object, called NGC 5643 X-1, on the galaxy’s outskirts. What could be a more powerful source of X-rays than a <a href="https://www.earth.com/news/how-do-black-holes-become-supermassive/">supermassive black hole</a>?”&nbsp;



“Surprisingly, the answer appears to be a much smaller black hole! While the exact identity of NGC 5643 X-1 is not yet known, evidence points to a black hole that is about 30 times more massive than the Sun.”&nbsp;



“Locked in an orbital dance with a companion star, the black hole ensnares gas from its stellar companion, creating a superheated disc that outshines the galactic center,” said ESA.



<h2 class="wp-block-heading" id="h-star-formation-in-ngc-5643">Star formation in NGC 5643</h2>



NGC 5643 also exhibits prominent regions of <a href="https://www.earth.com/news/six-rogue-worlds-discovered-inside-a-young-star-forming-nebula/">star formation</a> within its spiral arms. These areas are rich in gas and dust - the raw materials for birthing new stars - and glow brightly in ultraviolet and infrared light.&nbsp;



Observations from the Hubble Space Telescope and the Very Large Telescope (VLT) have helped uncover the complex interplay between star formation and the galaxy's central activity.



<h2 class="wp-block-heading" id="h-extended-ionized-gas-regions-nbsp">Extended ionized gas regions&nbsp;</h2>



A defining feature of NGC 5643 is the presence of its extended ionized gas regions, which are shaped by the galaxy's AGN activity and star-forming regions.&nbsp;



These structures have been mapped through optical spectroscopy, revealing intricate patterns that help astronomers understand the physical conditions of the gas, such as density, temperature, and composition.



The galaxy also has a dust lane that crosses its nucleus, partially obscuring direct observations of the central region in visible light.&nbsp;



Overall, NGC 5643 offers a fascinating glimpse into the dynamics of barred <a href="https://www.earth.com/news/the-mesmerizing-beauty-of-spiral-galaxies/">spiral galaxies</a> with active nuclei, serving as a valuable resource for studying the interactions between supermassive black holes, star formation, and galactic evolution.



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



Lupus is a constellation located in the southern sky, its name meaning "wolf" in Latin. It has been known since antiquity and was cataloged by the Greek astronomer Ptolemy.&nbsp;



Once part of the larger constellation Centaurus, Lupus was later recognized as a distinct constellation. It is relatively faint but holds historical significance in mythology, often associated with a sacrificial wolf in ancient stories.



Lupus is bordered by other constellations like Scorpius, Centaurus, and Libra. Its stars do not form a particularly striking pattern, but it contains a variety of interesting astronomical features. Among them are numerous double stars, globular clusters, and other deep-sky objects, visible through telescopes.&nbsp;



For observers in the Southern Hemisphere, Lupus is best seen in the winter and spring months, while it appears closer to the horizon for those in northern latitudes.



This constellation also lies along the <a href="https://www.earth.com/news/stars-at-the-edge-of-our-milky-way-galaxy-travel-more-slowly/">Milky Way</a>, offering a rich field of stars and nebulae for stargazers. Despite its modest brightness, Lupus holds a special place in the science of astronomy.



Image Credit: NASA/ESA Hubble Space Telescope



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Secrets of a spiraling galactic powerhouse

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

Today's Image of the Day from NASA Earth Observatory features an astronaut view of the northeast coast of Somalia. This region, which borders the Indian Ocean, has a mix of sandy beaches and rugged terrain, including the Cal Madow mountain range.



<h2 class="wp-block-heading" id="h-a-closer-look-at-northeast-somalia">A closer look at Northeast Somalia </h2>



"The detailed image reveals a desert landscape etched by wind and water," said NASA. "Over time, streams have cut canyons into the earth. But streams in this region are ephemeral, making groundwater the main source of fresh water."&nbsp;



"The water table is shallow (wells are typically drilled less than 20 meters deep) and meets the surface toward the coast, creating springs."



According to <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>, bidirectional winds sculpted the tan, brown, and reddish sand into transverse <a href="https://www.earth.com/news/sand-dunes-hold-a-record-of-fire-history/" target="_blank" rel="noreferrer noopener">sand dunes</a> visible near the stream’s deltas. "The orientation of the sand dunes indicates that they were likely formed by summer winds blowing up the coast from the southwest."



<h2 class="wp-block-heading" id="h-economy-of-northeast-somalia">Economy of Northeast Somalia </h2>



The economy of northeast Somalia, specifically the autonomous region of Puntland, is primarily based on fishing, livestock, and trade. 



Puntland has a long coastline along the Gulf of Aden and the Indian Ocean, and the waters are home to various types of fish, including tuna, mackerel, and lobster. 



However, the fishing industry is underdeveloped and faces challenges such as illegal, unreported, and unregulated (IUU) <a href="https://www.earth.com/news/dark-fleets-hidden-industrial-fishing-activity-exposed/" target="_blank" rel="noreferrer noopener">fishing</a> by foreign vessels.



The arid landscape is well-suited for raising goats, sheep, camels, and cattle. <a href="https://www.earth.com/news/bacteria-in-livestock-are-major-drivers-of-antibiotic-resistance/" target="_blank" rel="noreferrer noopener">Livestock</a> is the main export, with animals being sold to markets in the Middle East.



The region is home to important port cities like Bosaso, which is a hub for trade and commerce. These ports are vital for both the local and national economy.



<h2 class="wp-block-heading" id="h-wildlife-of-northeast-somalia">Wildlife of Northeast Somalia </h2>



The region includes a mix of desert-adapted <a href="https://www.earth.com/news/even-desert-plants-are-not-immune-to-climate-stress/" target="_blank" rel="noreferrer noopener">species</a> and those that thrive in the more fertile areas near the coast and highlands. 



<h3 class="wp-block-heading" id="h-mammals">Mammals</h3>



Large mammals such as the Somali wild ass, a critically endangered species, and the gerenuk, a long-necked antelope, are among the most notable inhabitants. 



The Somali wild ass is particularly suited to the harsh desert environment, while the gerenuk can survive long periods without water by feeding on moisture-rich vegetation.



<h3 class="wp-block-heading" id="h-birds">Birds</h3>



Birdlife in Northeast Somalia is also abundant, with a variety of species adapted to different habitats ranging from coastal areas to dry savannahs. 



Raptors such as the Somali ostrich and various eagles can be spotted, along with <a href="https://www.earth.com/news/how-do-migratory-birds-navigate-with-such-accuracy/" target="_blank" rel="noreferrer noopener">migratory birds</a> that pass through the region during seasonal changes. 



<h3 class="wp-block-heading" id="h-marine-life-reptiles-and-insects">Marine life, reptiles, and insects</h3>



The coastal waters, especially along the Gulf of Aden, are home to dolphins, whales, and a variety of fish species.



The region's reptiles include various species of lizards, snakes, and tortoises, many of which are well-adapted to the arid conditions. Insects, particularly locusts and butterflies, play significant roles in the local ecosystem.



<h3 class="wp-block-heading" id="h-wildlife-conservation">Wildlife conservation </h3>



Despite its arid climate, Northeast Somalia's diverse ecosystems support a surprising range of wildlife, although many species face threats from habitat loss, overgrazing, and hunting. 



Conservation efforts are ongoing, but the region's political instability has often hampered effective wildlife management and protection.



<h2 class="wp-block-heading" id="h-culture-of-northeast-somalia">Culture of Northeast Somalia </h2>



Northeast Somalia's culture is a mosaic of tradition, religion, and external influences, reflecting the resilience and adaptability of its people.



The region's culture is deeply intertwined with Islam, which influences daily life, social norms, and celebrations. Poetry and storytelling are highly valued, with oral traditions serving as a key method for passing down history and values. 



Somalis from this region are known for their hospitality, with the concept of "sooryo" emphasizing the importance of welcoming guests.



Family ties and clan affiliations play a significant role in the social structure, dictating everything from marriage to conflict resolution. 



The people of Northeast Somalia have a strong sense of identity and pride, which is often expressed through traditional dances, music, and clothing. Despite modern influences, there is a conscious effort to preserve traditional customs, especially in rural areas.



The photograph was captured on August 9, 2023 as the International Space Station orbited over the Horn of Africa.



Image Credit: NASA Earth Observatory&nbsp;



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Northeast Somalia: A landscape shaped by wind and water

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

Today's Image of the Day from the European Southern Observatory (ESO) features the Dark Wolf Nebula, located around 5,300 light-years from Earth in the constellation Scorpius.



According to ESO, this image of the dark <a href="https://www.earth.com/news/scientists-reveal-the-ring-nebula-as-it-has-never-been-seen-before/" target="_blank" rel="noreferrer noopener">nebula</a> creates the illusion of a wolf-like silhouette against a colorful cosmic backdrop.&nbsp;



“This image takes up an area in the sky equivalent to four full Moons, but is actually part of an even larger nebula called Gum 55. If you look closely, the wolf could even be a werewolf, its hands ready to grab unsuspecting bystanders,” noted <a href="https://www.eso.org/public/" target="_blank" rel="noreferrer noopener">ESO</a>.



<h2 class="wp-block-heading" id="h-observing-dark-nebulae">Observing dark nebulae </h2>



Dark nebulae are dense regions in space filled with gas and dust that absorb visible light, making them appear as dark patches against brighter backgrounds.&nbsp;



Unlike emission or reflection nebulae, dark nebulae do not glow on their own. Instead, they obstruct and obscure the light from stars and other objects lying behind them.&nbsp;



This characteristic makes them challenging to observe using visible-light telescopes, as they absorb and scatter light rather than reflecting or emitting it.&nbsp;



However, when viewed in infrared, where their obscuring effect is reduced, dark nebulae reveal intricate details about the <a href="https://www.earth.com/news/building-blocks-of-life-found-in-the-perseus-cloud/" target="_blank" rel="noreferrer noopener">molecular clouds</a> they contain.



According to ESO, astronomers study these clouds of frozen dust because they often contain new stars in the making.



<h2 class="wp-block-heading" id="h-dark-wolf-nebula-nbsp">Dark Wolf Nebula&nbsp;</h2>



The Dark Wolf Nebula is part of a larger complex known as the Lupus Molecular Cloud, one of several significant star-forming regions close to Earth.&nbsp;



Inside of dark nebulae, the conditions are prime for star formation. The dense gas and dust clump together under gravitational forces. As these clouds contract, they heat up, eventually igniting nuclear fusion and forming <a href="https://www.earth.com/news/new-molecule-detected-in-space-where-stars-are-born/" target="_blank" rel="noreferrer noopener">new stars</a>.



The Dark Wolf Nebula is known for revealing young, low-mass stars - or T Tauri stars - which are in the early stages of their evolution. These stars are still surrounded by disks of material that may eventually form new planets.



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



Scorpius is one of the most recognizable constellations in the sky. It resembles a scorpion with a long, curved tail and stinger.&nbsp;



Located in the southern sky, Scorpius is especially visible during the summer months in the Northern Hemisphere and during the winter months in the Southern Hemisphere. 



The constellation is often associated with the story of Orion in Greek mythology. According to legend, the scorpion was sent by the goddess Artemis to kill Orion, the great hunter, either as punishment for his arrogance or to protect her animals, depending on the version of the tale.&nbsp;



The gods later placed both <a href="https://www.earth.com/news/orion-nebula-destroys-an-oceans-worth-of-water-every-month/" target="_blank" rel="noreferrer noopener">Orion</a> and Scorpius in the sky, but in opposite parts of the heavens so they would never be seen together - as Scorpius rises in the east and Orion sets in the west.



Scorpius contains several notable stars and deep-sky objects. Its brightest star, Antares, is a red supergiant often referred to as the "heart of the scorpion" due to its reddish hue and central position. 



Antares is one of the largest visible stars in the sky and has a luminosity that is tens of thousands of times greater than that of our Sun. 



Scorpius is located close to the core of the Milky Way, making it a rich region for star clusters and nebulae. Among these are the Butterfly Cluster and the Ptolemy Cluster - both of which are visible to the naked eye under dark skies.



<h2 class="wp-block-heading" id="h-image-of-the-dark-wolf-nebula">Image of the Dark Wolf Nebula </h2>



“This image shows in spectacular detail how the dark wolf stands out against the glowing star-forming clouds behind it,” noted ESO.



“The colorful clouds are built up mostly of hydrogen gas and glow in reddish tones excited by the intense UV radiation from the newborn stars within them.”



The picture was created from images taken at different times. Each of the images has a filter that makes a different color of light visible.&nbsp;



Observations of the Dark Wolf Nebula provide astronomers with valuable information about the <a href="https://www.earth.com/news/massive-star-redefines-our-understanding-of-stellar-evolution/" target="_blank" rel="noreferrer noopener">evolution of stars</a> and the environments in which they form.



The image was captured by the VLT Survey Telescope (VST) at ESO’s Paranal Observatory in Chile.



Image Credit: ESO/VPHAS+ team



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Dark Wolf Nebula in the constellation Scorpius

Today's Image of the Day from the European Southern Observatory...

Today's Image of the Day from the European Space Agency features Messier 82, a starburst galaxy located in the constellation Ursa Major. This galaxy is actively forming new stars at a rate ten times that of the Milky Way.



In a study using the <a href="https://webb.nasa.gov/" target="_blank" rel="noreferrer noopener">James Webb Space Telescope</a> (JWST), an international team of astronomers has taken an unprecedented look at Messier 82 (M82), revealing intricate details about its frenzied star formation.&nbsp;



<h2 class="wp-block-heading" id="h-the-power-of-nircam">The power of NIRCam</h2>



The study, led by Alberto Bolatto, utilized Webb’s Near-Infrared Camera (NIRCam) to penetrate the thick dust and gas covering the galaxy's core, a region critical to understanding <a href="https://www.earth.com/news/baby-stars-release-sneezes-of-gas-and-dust-as-they-develop/" target="_blank" rel="noreferrer noopener">star formation</a>.&nbsp;



"M82 has garnered a variety of observations over the years because it can be considered as the prototypical starburst galaxy," noted Bolatto. “With Webb’s size and resolution, we can look at this star-forming galaxy and see all of this beautiful new detail.”



Webb's NIRCam has proven crucial for observing areas like M82’s center, where layers of dust typically obscure the view in other wavelengths. The camera's ability to capture infrared light allows it to reveal the galaxy's core and its dynamic processes.&nbsp;



<h2 class="wp-block-heading" id="h-messier-82-image">Messier 82 image </h2>



“This image shows the power of Webb. Every single white dot in this image is either a star or a star cluster. We can start to distinguish all of these tiny point sources, which enables us to acquire an accurate count of all the star clusters in this galaxy,” noted study co-author Rebecca Levy from the University of Arizona.



One of the NIRCam's innovative features is its mode that prevents bright sources from overwhelming the detector, which was particularly useful in studying the intensely active center of Messier 82.&nbsp;



In the image, dark brown tendrils of dust weave through the galaxy's glowing white core, interspersed with small green specks that represent concentrated areas of iron from <a href="https://www.earth.com/news/supernova-explosions-could-damage-distant-planets/" target="_blank" rel="noreferrer noopener">supernova</a> remnants. Red patches highlight regions where molecular hydrogen is illuminated by the radiation from nearby young stars.



<h2 class="wp-block-heading" id="h-insights-into-galactic-winds">Insights into galactic winds</h2>



The study also focused on understanding how <a href="https://www.earth.com/news/spin-of-a-new-black-hole-is-unlocking-galactic-mysteries/" target="_blank" rel="noreferrer noopener">galactic wind</a>, driven by the rapid rate of star formation and subsequent supernovae, influences M82’s environment. 



The NIRCam images showed clumpy streams of gas, appearing in red, which extend above and below the galaxy's plane, marking the path of this wind rushing out from the starburst's core.



A key revelation came from the NIRCam’s tracing of polycyclic aromatic hydrocarbons (PAHs), sooty chemical molecules that map out the structure of the galactic wind. To the surprise of researchers, the PAH emissions closely resembled the patterns of the hot, ionized gas, suggesting a more complex interaction within the wind than previously understood.&nbsp;



"It was unexpected to see the PAH emission resemble ionised gas," said Bolatto. "PAHs are not supposed to live very long when exposed to such a strong radiation field, so perhaps they are being replenished all the time. It challenges our theories and shows us that further investigation is required."



<h2 class="wp-block-heading" id="h-future-observations-of-messier-82">Future observations of Messier 82</h2>



The findings from Webb are just the beginning. The team plans to further analyze Messier 82 with additional data, including spectroscopic observations, to determine the ages of the <a href="https://www.earth.com/news/galaxy-collisions-hubble-spots-a-string-of-pearls-star-cluster/" target="_blank" rel="noreferrer noopener">star clusters</a> and the duration of each star formation phase within the starburst environment.&nbsp;



These observations will also assist in a broader understanding of similar processes in early <a href="https://www.earth.com/news/ceers-2112-ancient-galaxy-looks-strikingly-similar-to-ours/" target="_blank" rel="noreferrer noopener">galaxies</a>, which were common in the young universe.



<h2 class="wp-block-heading" id="h-broader-implications-of-the-study">Broader implications of the study</h2>



Study co-author Torsten Böker of the <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">European Space Agency</a> emphasized the broader implications of these findings.&nbsp;



“With these amazing Webb images, and our upcoming spectra, we can study how exactly the strong winds and shock fronts from young stars and supernovae can remove the very gas and dust from which new stars are forming,” explained Böker.&nbsp;



“A detailed understanding of this ‘feedback’ cycle is important for theories of how the early universe evolved, because compact starbursts such as the one in M82 were very common at high redshift.”



Image Credit: ESA/Webb, NASA &amp; CSA



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Messier 82: Unlocking the mysteries of star formation

Today's Image of the Day from NASA Earth Observatory features a 9.5-mile section of Pangong Lake on the western end of the Tibetan Plateau. The image was captured by a crew member onboard the International Space Station.&nbsp;



“In this winter scene, a sheet of cracked ice tops part of the lake,” noted <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>. “On the left side, open water appears blue. Shallow water offshore of a delta, formed by a small, winding river, appears green."



"Parallel lines along the coastlines of bays are visible in the high-resolution version of this image. These lines indicate raised beaches, which formed in the past when lake levels were higher.”



NASA pointed out that several roads cut across the landscape, including one with switchbacks that ascends a steep slope. "These roads facilitate tourist travel from both India and China.”&nbsp;



<h2 class="wp-block-heading" id="h-migratory-birds-at-pangong-lake-nbsp">Migratory birds at Pangong Lake&nbsp;</h2>



Pangong Lake and its surroundings are home to numerous bird species, particularly <a href="https://www.earth.com/news/migratory-birds-burn-unexpected-amounts-of-protein/" target="_blank" rel="noreferrer noopener">migratory birds</a>. Visitors can spot various waterfowl and waders that are rarely seen elsewhere.



“During the summer, species such as bar-headed geese and Brahminy ducks attract bird watchers to the lake, which is a major breeding ground for migrating birds,” said NASA.



Pangong Lake is one of the few places in India where the endangered black-necked crane is found during its breeding season. 



Ruddy shelduck and brown-headed <a href="https://www.earth.com/news/gulls-are-shifting-their-habitats-to-urban-areas/" target="_blank" rel="noreferrer noopener">gulls</a> are also frequently spotted around the lake. The ruddy shelduck is known for its striking orange-brown body and creamy white head, while the brown-headed gulls are often seen flying or swimming in the lake.



<h2 class="wp-block-heading" id="h-features-of-pangong-lake">Features of Pangong Lake </h2>



Pangong Lake is a stunning high-altitude lake situated in the <a href="https://www.earth.com/news/temperatures-are-rising-unexpectedly-fast-on-the-tibetan-plateau/" target="_blank" rel="noreferrer noopener">Himalayas</a>, extending from India to the Tibetan Autonomous Region of China. It is renowned for its mesmerizing beauty and dramatic setting, with the lake lying at an elevation of about 4,350 meters.



One of the most distinctive features of Pangong Lake is its changing colors, ranging from shades of blue to green and even red, influenced by the sky's reflection and the lake's mineral content.



This saline water lake is approximately 134 kilometers long and 5 kilometers wide at its broadest point. Despite its considerable size, Pangong Lake is relatively shallow.&nbsp;



The lake gained additional popularity after being featured in several Indian films - most notably the Bollywood hit "3 Idiots." Its remote location requires a permit for visitors, especially due to its proximity to the Line of Actual Control between India and China.



Despite the geopolitical sensitivities surrounding its location, Pangong Lake remains a favorite among tourists for its unparalleled natural beauty and serene environment.



<h2 class="wp-block-heading" id="h-high-altitude-lakes">High-altitude lakes</h2>



High-altitude lakes are unique bodies of water found at elevations typically above 3,000 meters (about 10,000 feet) in mountain ranges like the <a href="https://www.earth.com/news/himalayan-glaciers-retreating-threat-is-much-worse-than-previously-believed/" target="_blank" rel="noreferrer noopener">Himalayas</a>, Andes, and Rockies. 



These lakes are formed either by glacial activity, where glaciers erode the earth to create depressions that fill with melted snow and rainwater, or when natural dams created by landslides or moraines trap water in valleys.



<h3 class="wp-block-heading" id="h-extreme-environments">Extreme environments</h3>



The conditions at high altitudes make these lakes distinct in several ways. The climate is typically colder and harsher, with significant temperature variations between day and night. 



This extreme environment affects both the physical characteristics of the <a href="https://www.earth.com/news/alarming-study-most-of-the-worlds-largest-lakes-are-quickly-losing-water/" target="_blank" rel="noreferrer noopener">lakes</a> and the types of ecosystems they support. For example, due to lower atmospheric pressure, the boiling point of water is reduced, which can affect the type of life that can survive in these regions.



<h3 class="wp-block-heading" id="h-critical-habitats">Critical habitats</h3>



Biologically, high-altitude lakes often have limited biodiversity because only certain types of plants and animals can tolerate the cold temperatures and lower oxygen levels in the water. 



Despite this, these lakes are crucial habitats for some unique species of fish, birds, and other wildlife. They also serve as important indicators of climate change, as variations in their water levels and temperatures can reflect environmental shifts.



<h3 class="wp-block-heading" id="h-significance-of-high-altitude-lakes">Significance of high-altitude lakes </h3>



Lakes at high altitudes are often clear and pristine, due to the low density of human populations in these areas and minimal industrial activity, making them significant for ecological studies and attractive for tourism. 



However, they are sensitive ecosystems, and increased tourist activity brings challenges like pollution and habitat disruption.



High-altitude lakes are not only beautiful and scientifically significant but also hold cultural importance for local communities, often considered sacred and associated with historical and spiritual significance.



Image Credit: NASA Earth Observatory&nbsp;



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Pangong Lake on the Tibetan Plateau

Today's Image of the Day from the European Space Agency features the Little Dumbbell Nebula, also known as Messier 76, located in the constellation Perseus 3,400 light-years away from Earth.



Astronomers captured this image of the Little Dumbbell Nebula to commemorate the 34th anniversary of the Hubble Space Telescope, a joint venture between NASA and the European Space Agency (<a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>).



The snapshot provides not only a breathtaking view, but also deep insights into the life cycle of <a href="https://www.earth.com/news/dark-stars-scientists-discover-a-new-type-of-star-powered-by-dark-matter/" target="_blank" rel="noreferrer noopener">stars</a> and the dynamic processes within nebulae.



<h2 class="wp-block-heading" id="h-understanding-messier-76">Understanding Messier 76</h2>



Messier 76 is categorized as a planetary nebula - a term which refers to its round, planet-like appearance when viewed through early, low-power telescopes. 



However, the term is somewhat misleading as planetary nebulae have no connection to actual <a href="https://www.earth.com/news/nasa-finds-17-exoplanets-that-have-oceans-and-possibly-alien-life/" target="_blank" rel="noreferrer noopener">planets</a>.&nbsp;



Instead, they represent an expansive shell of luminous gases expelled by a dying red giant star, which subsequently collapses into a dense, hot white dwarf. 



This transformation marks the late stages of stellar evolution for medium to low-mass stars.



<h2 class="wp-block-heading" id="h-structure-of-messier-76">Structure of Messier 76</h2>



The structure of Messier 76 is particularly notable. It includes a central ring, giving the appearance of a bar-like feature, with two distinct lobes emanating from either side. 



This formation is believed to be the result of materials ejected by the star during its red giant phase, possibly sculpted by interactions with a companion star.&nbsp;



Although this binary companion is not visible in current Hubble images, its presence is inferred from the thick disk of dust and gas aligned with its orbital plane. 



The phenomenon of the companion star potentially being absorbed by the primary star, a process akin to stellar cannibalism, is a captivating aspect of the nebula's history.



<h2 class="wp-block-heading" id="h-the-dynamic-environment-of-the-nebula">The dynamic environment of the nebula</h2>



At the core of the nebula, the primary star, now collapsing into a <a href="https://www.earth.com/news/white-dwarf-stars-may-be-billions-of-years-older-than-estimated/" target="_blank" rel="noreferrer noopener">white dwarf</a>, reaches extreme temperatures. This heat is estimated to be 120,000 degrees Celsius - about 24 times hotter than the surface of our Sun.&nbsp;



This intensely hot remnant is visible as a small, bright point at the center of the nebula. Directly below this, another star can be seen; however, it is merely aligned with the nebula by chance and is not a part of it.



<h2 class="wp-block-heading" id="h-powerful-glow-of-messier-76">Powerful glow of Messier 76</h2>



The dynamics within Messier 76 are driven by powerful forces. The central disk seems to constrict the material, creating two lobes of gas escaping along the rotational axis of the star, perpendicular to the disk.&nbsp;



The lobes are propelled outward by a potent stellar wind, moving at a staggering two million miles per hour. This rapid movement is sufficient to travel the distance from Earth to the <a href="https://www.earth.com/news/timeless-mystery-solved-scientists-uncover-what-is-inside-the-moons-core/" target="_blank" rel="noreferrer noopener">Moon</a> in just over seven minutes.&nbsp;



The collision of the fast-moving gas with older, slower-moving material ejected during the star’s red giant phase results in the stunning glowing effect seen in the nebula. 



The glow, ignited by the ultraviolet radiation from the white dwarf, is a spectacle of colors with red emanating from nitrogen and blue from oxygen.



<h2 class="wp-block-heading" id="h-a-cosmic-moment-in-time">A cosmic moment in time</h2>



Despite its current brilliance, the existence of the Little Dumbbell Nebula is fleeting on a cosmological scale. It is expected to last only about 15,000 years - a mere moment in the lifespan of the <a href="https://www.earth.com/news/dark-energy-is-ripping-the-universe-apart-but-we-arent-sure-how/" target="_blank" rel="noreferrer noopener">universe</a>.&nbsp;



This brief period highlights the transient nature of such cosmic phenomena, which, while short-lived, provide crucial insights into the mechanics of stellar evolution and the complex interactions within these celestial sculptures.



<h2 class="wp-block-heading" id="h-more-about-messier-76">More about Messier 76</h2>



Messier 76 was discovered by Pierre Méchain in 1780. It was later cataloged by Charles Messier, who included it in his famous list of nebulous objects.



The nebula's faintness and small size require a good telescope to be observed effectively, with larger telescopes able to reveal more of its fine details and structure.



Studying Messier 76 helps astronomers understand the life cycle of stars and the processes that occur during the late stages of stellar evolution. 



The materials expelled by planetary nebulae like Messier 76 eventually contribute to the interstellar medium, from which new stars and planetary systems may form.



Image Credit: ESA Space Agency&nbsp;



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Secrets of the Little Dumbbell Nebula  

Crater Lake&nbsp;(Klamath:&nbsp;Giiwas) is a&nbsp;crater lake&nbsp;in south-central&nbsp;Oregon&nbsp;in the western United States. It is the main feature of&nbsp;Crater Lake National Park&nbsp;and is famous for its deep blue color and water clarity. The lake partly fills a nearly 2,148-foot-deep (655&nbsp;m) caldera that was formed around 7,700 (± 150) years ago&nbsp;by the collapse of the volcano&nbsp;Mount Mazama. There are no rivers flowing into or out of the lake; the evaporation is compensated for by rain and snowfall at a rate such that the total amount of water is replaced every 250 years. With a depth of 1,949 feet (594&nbsp;m),&nbsp;the lake is the&nbsp;deepest&nbsp;in the United States. In the world, it ranks ninth for maximum depth, and third for mean (average) depth. Crater Lake features two small islands.&nbsp;Wizard Island, located near the western shore of the lake, is a&nbsp;cinder cone&nbsp;approximately 316 acres (128 ha) in size.&nbsp;Phantom Ship, a natural rock pillar, is located near the southern shore.



The park has two developed campgrounds,&nbsp;Mazama Campground&nbsp;and&nbsp;Lost Creek Campground. They are open only in the summer. Mazama Campground has 214 sites for tents and RVs. Lost Creek Campground has 16 sites for tents only.&nbsp; Sleeping overnight in the park is allowed only for hotel guests, campground campers, and backpackers who obtain a&nbsp;backcountry permit. Camping in the park’s pullouts, picnic areas, and parking lots is prohibited.

Crater Lake National Park, Oregon

People have wondered for centuries how dogs branched off from wild wolves. Some suspect that humans selectively bred the friendliest wolves, while others argue that canines chose to linger near people for steady snacks.



Modern science is analyzing this question by looking at genetic and archaeological records. Recent findings from a statistical study hint that ancient <a href="https://www.earth.com/news/reintroducing-wolves-could-help-scotland-fight-climate-change/" target="_blank" rel="noreferrer noopener">wolves</a> might have shaped their own domestication if they stayed in human territory, where leftovers gave them a reliable food supply.



Alex Capaldi, a mathematician and statistician from <a href="https://www.jmu.edu/index.shtml" target="_blank" rel="noreferrer noopener">James Madison University</a> in Virginia, is one of the researchers behind this modeling effort.



“When females were selecting mates, they also had to select males that had a similar tameness to themselves,” said Capaldi.



<h2 class="wp-block-heading" id="h-appetite-of-early-dogs">Appetite of early dogs</h2>



This concept of self-domestication revolves around the idea that some wolves drifted toward settlements for discarded scraps. 



By sticking close to humans, these <a href="https://www.earth.com/news/world-wildlife-day-2025-a-global-call-to-protect-nature/" target="_blank" rel="noreferrer noopener">animals</a> cut down on the dangers of hunting and gained an edge in survival.



Scientists have observed a similar dynamic in <a href="https://www.science.org/doi/10.1126/science.1095335" target="_blank" rel="noreferrer noopener">early feline domestication</a>, where wild cats gravitated toward places with abundant rodents. 



Over time, that arrangement led to a mutual benefit: farmers got pest control and the felines got predictable meals.



<h2 class="wp-block-heading" id="h-how-wolves-became-dogs">How wolves became dogs</h2>



The research team used an <a href="https://www.publichealth.columbia.edu/research/population-health-methods/agent-based-modeling" target="_blank" rel="noreferrer noopener">agent-based model</a>, a method that simulates each wolf or dog as an individual with unique traits and behaviors. 



By crunching survival odds, mating preferences, and competition over resources, the simulation maps out how certain wolves might have morphed into early dogs.



The experts tested different scenarios, including whether <a href="https://www.earth.com/news/wolves-are-rebuilding-forests-and-restoring-ecosystem-balance-in-yellowstone/" target="_blank" rel="noreferrer noopener">wolves</a> that remained near humans would thrive if they also picked mates with similar temperaments.



After many simulated years, the model showed that mild-mannered wolves could become a separate group if there was enough leftover food available.



<h2 class="wp-block-heading" id="h-unraveling-the-timeline">Unraveling the timeline</h2>



Scholars generally agree that dogs emerged from gray wolves between roughly 30,000 and 15,000 years ago, though the exact timing is still debated. 



The second major phase of domestication, starting about 15,000 years ago, likely involved humans deliberately breeding canines for tasks like hunting or herding.



The earlier phase remains more puzzling because there is less evidence that prehistoric people intentionally bred wolves. 



Instead, some scientists suspect that a portion of the wolf population shifted toward a calmer demeanor all on its own.



<h2 class="wp-block-heading" id="h-a-deeper-connection-with-humans">A deeper connection with humans</h2>



This new <a href="https://royalsocietypublishing.org/doi/10.1098/rspb.2024.2646" target="_blank" rel="noreferrer noopener">model</a> offers a potential explanation for how dogs might have emerged without human oversight in the distant past. 



It also suggests that creatures capable of forming alliances with humans could gain unique evolutionary advantages.



Most domestic dog breeds we know today were refined by artificial selection. Yet the original taming process may have been more self-directed, planting the seeds for our enduring relationship.



Experts point out that dogs did more than share our campsites. Historical evidence shows they guarded settlements, aided in hunting, and accompanied people across new lands, shaping the course of human expansion.



Working side by side, dogs and humans built a mutual trust that has carried forward into the modern age. 



The consistent presence of these animals in archaeological sites highlights how both species adapted to each other’s quirks and needs.



<h2 class="wp-block-heading" id="h-the-future-of-human-animal-interactions">The future of human-animal interactions</h2>



Researchers are now exploring how mate choice, resource availability, and social tolerance might influence the future of <a href="https://www.earth.com/news/ethiopian-wolves-feed-on-nectar-and-pollinate-flowers/" target="_blank" rel="noreferrer noopener">animal</a>-human interactions. 



They hope that understanding dog domestication could reveal patterns relevant to other species that live near us.



By analyzing different variables, scientists can see if similar self-domestication pathways occur when wildlife takes advantage of human-generated resources. These investigations might explain how certain species adapt to urban settings and find alternative ways to survive.



<h2 class="wp-block-heading" id="h-doubts-about-wolf-to-dog-evolution">Doubts about wolf-to-dog evolution</h2>



Some skeptics say humans might not have produced enough leftovers for wolves or would have killed them off. Yet this model argues that even modest scraps could still support a very small, tamer wolf group.



Critics also question whether wolves would choose docile mates without direct human help. The simulation suggests that tamer traits might sometimes spread if those wolves thrived near people.



The research team plans to refine these simulations by including climate shifts and disease. Spatial data could reveal how some wolf groups became isolated and evolved gentler traits. 



Computer modeling is giving us new ways to think about how dogs may have emerged from wolves without human breeding.&nbsp;



The study is published in <a href="https://royalsocietypublishing.org/doi/10.1098/rspb.2024.2646" target="_blank" rel="noreferrer noopener">Proceedings of the Royal Society B</a>.



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From wolves to man's best friend: Did domestication begin without human help?

People have wondered for centuries how dogs branched off from...

Megalodon,Attacks,Humpback,Whale,3d,Illustration,-,A,Megalodon,Shark

The megalodon has fascinated people for generations. Massive teeth and scattered skeletal remains once led to depictions of a stocky predator, but new research suggests the megalodon was longer and more streamlined than the than the classic great white shark-like appearance that many of us imagined.



Phillip Sternes, who completed his doctorate at the <a href="https://www.ucr.edu" target="_blank" rel="noreferrer noopener">University of California Riverside</a> and now works in shark conservation, has helped to reveal a fresher perspective on the megalodon.



He and an international team examined vertebrae and compared them with more than one hundred modern and ancient shark species to learn more about the extinct predator’s form and potential swimming style.



<h2 class="wp-block-heading" id="h-long-lean-and-built-for-travel">Long, lean, and built for travel</h2>



Taking a new approach, the team measured the megalodon’s body in segments rather than relying on tooth size. 



This helped the researchers estimate the head, trunk, and tail in a more balanced way, giving us a shark that might stretch about 80 feet from nose to tail.



The experts found that megladons may have weighed around 94 tons, matching a large whale’s bulk in many respects. 



Yet, the weight was arranged along a longer torso, allowing the <a href="https://www.earth.com/news/sharks-may-benefit-from-rising-temperatures-but-not-from-rising-co2/" target="_blank" rel="noreferrer noopener">shark</a> to move with less drag than a shorter, wider shape would cause.



<h2 class="wp-block-heading" id="h-new-insights-into-megladon-shape">New insights into megladon shape</h2>



The researchers describe a body more akin to a lemon shark’s proportions. 



The study suggests that megalodon had a slimmer trunk and a smoother taper that could have been practical for traveling over long stretches of ocean without burning through too much energy.



“This study provides the most robust analysis yet of megalodon’s body size and shape,” said Sternes. This means prior images of a round midsection need updating.



“You lead with your head when you swim because it’s more efficient than leading with your stomach,” said Tim Higham, a UC Riverside biologist involved in the project.



In other words, a <a href="https://bpb-us-e1.wpmucdn.com/sites.harvard.edu/dist/6/58/files/2022/03/Lauder.2015.pdf" target="_blank" rel="noreferrer noopener">long, cylindrical shape</a> can help reduce water resistance, similar to well-built swimmers.&nbsp;



“The physics of swimming limit how stocky or stretched out a massive predator can be,” said Higham, adding that physical limits steer the evolution of large swimmers.&nbsp;



<h2 class="wp-block-heading" id="h-megalodon-balanced-speed-and-endurance">Megalodon balanced speed and endurance</h2>



Many big ocean <a href="https://www.earth.com/news/shark-fishing-is-making-coral-reefs-collapse-in-an-unexpected-way/" target="_blank" rel="noreferrer noopener">predators</a> use bursts of speed to hunt, then settle into an easier pace the rest of the time. 



The megalodon’s shape would fit this pattern, giving it a middle-range cruising speed but still enough power for a quick strike.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/03/megaladon_much-different-appearance_revised-depiction_credit-UCR_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2025/03/megaladon_much-different-appearance_revised-depiction_credit-UCR_1s.webp" alt="Adult human depicted for size comparison. (Kenshu Shimada/DePaul University)" class="wp-image-1962484"/></a><figcaption class="wp-element-caption">Adult human depicted for size comparison. (Kenshu Shimada/DePaul University)</figcaption></figure>



Sharks like the great white are swift over <a href="https://academic.oup.com/icb/article-abstract/55/1/6/618209?redirectedFrom=PDF" target="_blank" rel="noreferrer noopener">short bursts</a>, yet they aren’t known for long-distance economy in the same way as certain larger whales. 



A more elongated megalodon likely balanced moderate speed with a steady swimming style that was efficient over wide areas.



<h2 class="wp-block-heading" id="h-birth-size-and-hunting">Birth size and hunting</h2>



“It is entirely possible that megalodon pups were already taking down marine mammals shortly after being born,” said Sternes. The study also explored how big baby megalodons might have been upon entering the ocean.



If so, these pups would be imposing from day one, perhaps around 13 feet long. That’s roughly the size of an average adult great white shark, giving young megalodons an immediate advantage against smaller prey.



<h2 class="wp-block-heading" id="h-megladon-s-similarity-to-lemon-sharks">Megladon's similarity to lemon sharks</h2>



Modern lemon sharks are <a href="https://pubmed.ncbi.nlm.nih.gov/22497412/" target="_blank" rel="noreferrer noopener">built</a> to glide gently through water while still mustering enough speed for an ambush. 



The research group recognized parallels in the vertebral patterns of megalodon and lemon sharks, raising the possibility that the extinct giant combined large-whale heft with a body style known for efficient travel.



Their analysis ruled out the typical notion that megalodon resembled an overblown great white. Instead, the skeletal measurements support a sleeker overall profile, challenging long-held views of a barrel-chested sea monster.



<h2 class="wp-block-heading" id="h-speed-and-shark-evolution">Speed and shark evolution</h2>



In giant fish, <a href="https://www.taylorfrancis.com/books/edit/10.1201/b11867/biology-sharks-relatives-jeffrey-carrier-john-musick-michael-heithaus" target="_blank" rel="noreferrer noopener">shape</a> can matter more than size when it comes to swimming economics. A thick girth can generate drag, but a straighter trunk lets water pass more smoothly.



Whale sharks and basking sharks also show that immense size does not always mean <a href="https://onlinelibrary.wiley.com/doi/10.1111/brv.12839" target="_blank" rel="noreferrer noopener">clumsy movement</a>. Researchers point to megalodon’s design as an example of similar engineering, though on an even grander scale.



Gigantic sharks appear rarely in the fossil record, implying that certain conditions must align for them to thrive. A well-proportioned body may have been key to megalodon’s success in patrolling vast habitats for prey.



Yet, eventual climate shifts and possible competition from other fierce hunters like early great whites likely added pressures. Over time, those combined forces might have spelled the end for megalodon.



<h2 class="wp-block-heading" id="h-megalodon-s-design-and-ocean-evolution">Megalodon’s design and ocean evolution</h2>



The new understanding of megalodon speaks to broader ocean dynamics. <a href="https://www.earth.com/news/unprovoked-shark-attacks-dropped-to-record-low-in-2024/" target="_blank" rel="noreferrer noopener">Large animals</a> often follow recurring patterns in body outlines, whether they’re sharks or whales.



While speed and stamina vary, they’re still shaped by the same drag-reducing principles. That shared design echoes through millions of years of vertebrate history.



The study is published in <a href="https://palaeo-electronica.org/content/2025/5450-biology-of-otodus-megalodon" target="_blank" rel="noreferrer noopener">Palaeontologia Electronica</a>.



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Megalodon looked much different than how humans have imagined

The megalodon has fascinated people for generations. Massive teeth and...

It is easy to think of our solar neighborhood as a tight little cluster of planets, but the reality is far more expansive. Beyond Neptune, a crowd of frozen bits and pieces lingers in the Kuiper Belt, yet that is only the start of our Sun’s extended family. 



Farther out - about 9.3 trillion miles away - sits the Oort Cloud, which some refer to as the outermost boundary of the Solar System. 



This region is believed to hold <a href="https://www.earth.com/news/eris-and-makemake-icy-dwarf-planets-in-our-own-solar-system-may-support-life/" target="_blank" rel="noreferrer noopener">countless icy objects</a> that still feel the Sun’s pull, no matter how faint. Many have viewed this area as a scattered collection, with most of its bodies quietly resting in near isolation. 



However, according to a recent study, there is a surprising spiral pattern in the inner Oort Cloud that runs much deeper than a random sprinkling of frozen debris.



<h2 class="wp-block-heading" id="h-understanding-the-oort-cloud-the-basics">Understanding the Oort Cloud - the basics</h2>



The Oort Cloud is usually divided into two zones. The outer part stretches in a spherical shell and starts at around 10,000 astronomical units from the Sun.



The inner Oort Cloud begins closer in - roughly 1,000 astronomical units out - and forms what was once considered a disc-shaped region.



Scientists have long believed that the outer shell experiences more disruptions from passing stars, while the inner zone is held together by the Sun’s gravity. 



Some of the comets that swing through the inner <a href="https://www.earth.com/news/our-solar-systems-journey-through-the-milky-way-may-have-altered-earths-climate/" target="_blank" rel="noreferrer noopener">Solar System</a>, including long-period comets, can be traced to these distant reaches.



Its outer boundary marks a sort of transition point where the Sun’s Hill sphere merges with <a href="https://www.earth.com/news/two-enormous-fermi-bubbles-discovered-towering-above-and-below-our-milky-way-galaxy/" target="_blank" rel="noreferrer noopener">the Milky Way</a>’s gravitational influence. Astronomical models show that the outer Oort Cloud is only loosely connected to the Sun. 



Meanwhile, this weaker binding is precisely why small tugs from passing stars, and even the galactic tide, can change the direction of these icy residents. Some comets then slip free, heading inward to light up our skies.



<h2 class="wp-block-heading" id="h-looking-beyond-the-heliosphere">Looking beyond the heliosphere</h2>



Efforts to see deep into this region face an obvious hurdle: these objects are far, faint, and spread across enormous distances. 



No spacecraft to date has gone anywhere near the middle of this domain, though a few probes have passed into interstellar space. 



Despite the limited observations, researchers note that the outer Oort Cloud may supply short-period comets, while the inner region tends to stay stable because it is less exposed to disturbance from wandering stars.



<h2 class="wp-block-heading" id="h-spiral-pattern-in-the-oort-cloud">Spiral pattern in the Oort Cloud</h2>



A fresh round of modeling from a team of astronomers, led by <a href="https://www.boulder.swri.edu/~davidn/" target="_blank" rel="noreferrer noopener">David Nesvorný</a> of the Southwest Research Institute (<a href="https://www.swri.org/" target="_blank" rel="noreferrer noopener">SWRI</a>) in the US., sheds new light on this hidden zone.



The work included simulations spanning 4.6 billion years, starting from the Solar System’s formative days. 



These tests factored in the Sun’s gravitational pull, influences from <a href="https://www.earth.com/news/our-solar-systems-journey-through-the-milky-way-may-have-altered-earths-climate/" target="_blank" rel="noreferrer noopener">the Milky Way</a>, and the complex dance of the comets themselves.



“As the galactic tide acts to decouple bodies from the scattered disk it creates a spiral structure in physical space that is roughly 15,000 astronomical units in length,” writes Nesvorný. “The spiral is long-lived and persists in the inner Oort Cloud to the present time.”



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/03/oort-cloud_solar-system_diagram_NASA_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2025/03/oort-cloud_solar-system_diagram_NASA_1s.webp" alt="Scientists think the Oort Cloud is a giant spherical shell surrounding the Sun, planets and Kuiper Belt Objects. It's like a big, thick bubble around our solar system, made of icy, comet-like objects. Credit: NASA" class="wp-image-1961969"/></a><figcaption class="wp-element-caption">Scientists think the Oort Cloud is a giant spherical shell surrounding the Sun, planets and Kuiper Belt Objects. It's like a big, thick bubble around our solar system, made of icy, comet-like objects. Credit: NASA</figcaption></figure>



The spiral pattern is about 15,000 astronomical units wide, or around 1.4 trillion miles from one end to the other. It also appears to have a tilt of roughly 30 degrees relative to the usual plane of <a href="https://www.earth.com/news/interstellar-tunnel-found-that-connects-our-solar-system-to-other-stars/" target="_blank" rel="noreferrer noopener">our Solar System</a>. 



That tilt and the elongated swirl may trace back to the galaxy’s own gravitational pulling, which could have twisted and shaped the inner Oort Cloud soon after the Solar System’s birth.



<h2 class="wp-block-heading" id="h-surprising-spiral-formation">Surprising spiral formation</h2>



The simulations suggest that, early in the Solar System’s history, <a href="https://www.earth.com/news/streaming-instability-hypothesis-altjira-system-kuiper-belt-hubble-three-body-system/" target="_blank" rel="noreferrer noopener">bits of icy debris</a> were scattered and then gradually coaxed into a spiral alignment in the Oort Cloud by galactic forces. 



Although random passes by neighboring stars can yank certain comets out of their orbits, the main spiral appears to endure. 



This means that a hidden pattern might be circling at the far edge of our Sun’s direct domain.



Researchers revisited earlier simulations to see if they had missed hints of this structure. They found that the same spiral formation popped up even when they ran tests under slightly different assumptions. 



This recurring clue led them to propose a lasting swirl in the inner Oort Cloud that does not break down easily.



<h2 class="wp-block-heading" id="h-why-does-any-of-this-matter">Why does any of this matter?</h2>



The idea of a giant spiral twisting beyond the planetary region may spark questions about direct observations. The models suggest that seeing it in action, as a whole, is nearly impossible with current technology. 



The objects out there reflect too little light, and their motions unfold over such a long timeframe that it is not practical to watch them shift. 



Still, the pattern aligns with what has been learned about the faint comets that occasionally travel inward.



There is a sense that these findings might offer a peek into how the Sun’s outer family has evolved since the very beginning. 



A stable spiral implies that the interplay between our star and the <a href="https://www.earth.com/news/milky-ways-black-hole-unleashes-mysterious-flares/" target="_blank" rel="noreferrer noopener">Milky Way</a> is more delicate than once assumed. 



Some comets will always break away from that remote territory, but enough remain to preserve this structure for eons to come.



The full study was published on the preprint server <a href="https://arxiv.org/abs/2502.11252" target="_blank" rel="noreferrer noopener">arXiv</a>.



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Spiral structure discovered at the edge of our solar system can't be explained

It is easy to think of our solar neighborhood as...

For many years, paleontologists believed that the fossilization process completely eradicated any original organic molecules in ancient remains.&nbsp;



Now, scientists at the University of Liverpool have discovered that some Mesozoic fossils still preserve vestiges of their original organic compounds. 



The findings shed light on how proteins like collagen may survive for millions of years within dinosaur bones.



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



The research was focused on a well-preserved hip bone from an Edmontosaurus - a duck-billed <a href="https://www.earth.com/news/where-did-dinosaurs-come-from-missing-fossils-hold-the-secret/">dinosaur</a> excavated from the Hell Creek Formation in South Dakota. 



The fossil, weighing roughly 50 pounds (23 kilograms), is part of the University of Liverpool’s collections.&nbsp;



The researchers used advanced mass spectrometry and protein sequencing to detect and analyze signs of bone collagen in the sample. 



The results contradict the long-held assumption that any organic material found in fossils must be modern contamination.



“This research shows beyond doubt that organic biomolecules, such as proteins like collagen, appear to be present in some fossils,” said Professor Steve Taylor, chair of the Mass Spectrometry Research Group at the <a href="https://www.liverpool.ac.uk/" target="_blank" rel="noreferrer noopener">University of Liverpool</a>.



“Our results have far-reaching implications. Firstly, it refutes the hypothesis that any organics found in fossils must result from contamination.”&nbsp;



These <a href="https://www.earth.com/news/how-dinosaur-collagen-survived-the-test-of-time/" target="_blank" rel="noreferrer noopener">collagen</a> remnants offer a rare glimpse into dinosaur biology, opening up new questions about what biochemical information might still be gleaned from well-preserved fossils.



<h2 class="wp-block-heading" id="h-understanding-collagen-the-basics">Understanding collagen - the basics</h2>



Collagen is the glue that holds animal bones together - literally. It’s the most abundant protein in bones, giving them structure, flexibility, and strength. 



Without collagen, bones would be brittle and more likely to snap under pressure. This protein forms a tight mesh within the bone, creating a balance between rigidity and resilience. 



When you cook bones - like in bone broth - that collagen breaks down into gelatin, which gives the broth that rich, silky texture. 



That’s also why bone-in meats tend to be juicier and more tender when slow-cooked; the collagen melts into the meat, making it extra flavorful.



<h2 class="wp-block-heading" id="h-ancient-molecules-survive-fossilization-nbsp">Ancient molecules survive fossilization&nbsp;</h2>



Collagen is the primary structural protein in the bones of living organisms. After millions of years, one would expect it to be replaced by minerals or otherwise degraded.&nbsp;



However, the study demonstrates that not only can collagen molecules survive fossilization but they can also remain detectable if the <a href="https://www.earth.com/news/fossils-capture-a-turning-point-in-the-evolution-of-life/" target="_blank" rel="noreferrer noopener">fossil</a> is of exceptional quality.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/02/dinosaur-fossil_collagen-discovery_credit-ULiverpool_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2025/02/dinosaur-fossil_collagen-discovery_credit-ULiverpool_1s.webp" alt="Edmontosaurus sp. sacrum (UOL GEO.1) from Harding County, SD, Hell Creek formation, main fragment shown. Credit: University of Liverpool" class="wp-image-1958814"/></a><figcaption class="wp-element-caption">Edmontosaurus sp. sacrum (UOL GEO.1) from Harding County, SD, Hell Creek formation, main fragment shown. Credit: University of Liverpool</figcaption></figure>



The team’s analyses involved a combination of protein sequencing, tandem mass spectrometry, and imaging techniques to characterize the Edmontosaurus bone.&nbsp;



These methods allowed the experts to pinpoint markers of collagen and confirm that the protein fragments were indeed vestiges from the ancient organism.



<h2 class="wp-block-heading" id="h-hidden-record-of-dinosaur-physiology-nbsp">Hidden record of dinosaur physiology&nbsp;</h2>



The discovery suggests the value of re-examining historical fossil collections for similarly overlooked molecular structures. 



Fossils previously dismissed as fully mineralized may still contain pockets of original organic material, offering a wealth of new insights.



Taylor emphasized the potential of cross-polarized light microscopy images that have been archived for decades.&nbsp;



“These images may reveal intact patches of bone collagen, potentially offering a ready-made trove of fossil candidates for further protein analysis,” said Taylor.&nbsp;



The potential to reanalyze these images with modern techniques could reveal a hidden record of dinosaur physiology, including growth rates and metabolic traits.&nbsp;



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



This breakthrough has major implications for paleontology and molecular biology. With access to ancient proteins, scientists can refine dinosaur phylogenies by comparing molecular signatures.&nbsp;



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/02/dinosaur-fossil_collagen-discovery_credit-ULiverpool_2m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2025/02/dinosaur-fossil_collagen-discovery_credit-ULiverpool_2s.webp" alt="Edmontosaurus sp. sacrum (UOL GEO.1) from Harding County, SD, Hell Creek formation, main fragment shown. Credit: University of Liverpool" class="wp-image-1958816"/></a><figcaption class="wp-element-caption">Edmontosaurus sp. sacrum (UOL GEO.1) from Harding County, SD, Hell Creek formation, main fragment shown. Credit: University of Liverpool</figcaption></figure>



Furthermore, experts could uncover the biochemical pathways that enabled the preservation of organic compounds over millions of years.



“The findings inform the intriguing mystery of how these proteins have managed to persist in fossils for so long,” said Taylor.&nbsp;



<h2 class="wp-block-heading" id="h-confirming-the-presence-of-dinosaur-collagen-nbsp">Confirming the presence of dinosaur collagen&nbsp;</h2>



For the investigation, researchers from multiple institutions specialized in different analytic methods.&nbsp;



The Mass Spectrometry Research Group performed in-depth protein sequencing, while other collaborators contributed to high-resolution imaging, additional data verification, and advanced mass spectrometry.&nbsp;



These collective efforts reinforced the conclusion that the collagen was not a result of contamination, but an ancient molecular relic.



In addition, the successful detection of collagen alpha-1 fragments - one of the most fundamental protein forms in bone - came from the Center for Proteome Research at the University of Liverpool.&nbsp;



Experts at <a href="https://www.ucla.edu/" target="_blank" rel="noreferrer noopener">UCLA</a> contributed tandem mass spectrometry capabilities to detect and quantify markers that definitively establish the presence of ancient collagen.



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



Even though the study resolves a long-standing debate about the possibility of finding original organic molecules in dinosaur fossils, it also opens new avenues for research.&nbsp;



By pinpointing the conditions under which these molecular remnants can remain stable, scientists might be able to target specific specimens or geological settings where surviving biomolecules are most likely to be found.



There is growing interest in how such data can illuminate dinosaur evolutionary pathways and relationships.&nbsp;



If collagen or other proteins can be consistently identified across a variety of specimens, it may become possible to conduct molecular-level comparisons between species.



Ultimately, these findings prompt reexamination of museum and field collections worldwide, suggesting that the deeper secrets of <a href="https://www.earth.com/news/timeline-of-lifes-evolution-extended-by-nearly-1-5-billion-years/" target="_blank" rel="noreferrer noopener">ancient life</a> - once deemed lost - may still lie hidden within the fossil record.&nbsp;



The study is published in the journal <a href="https://pubs.acs.org/doi/10.1021/acs.analchem.4c03115#" target="_blank" rel="noreferrer noopener">Analytical Chemistry</a>.



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Discovery of organic molecules in 66-million-year-old dinosaur bones rocks paleontology

For many years, paleontologists believed that the fossilization process completely...

Researchers in Sweden have reported control over a new kind of magnetism with the potential to boost electronic performance. 



Their work shows that this new class of magnetism, called altermagnetism, can increase memory device operation speeds by up to a thousand times.



Scientists say it stands apart from the two widely known forms of magnetic order and may open doors to faster, more efficient technologies.



Scientists from the University of Nottingham's <a href="https://www.nottingham.ac.uk/physics/" target="_blank" rel="noreferrer noopener">School of Physics and Astronomy</a> have confirmed this third category in microscopic devices, and their findings have been published in Nature. Professor Peter Wadley from the same institution led the research.



<h2 class="wp-block-heading" id="h-understanding-altermagnetism-the-basics">Understanding altermagnetism - the basics</h2>



Materials that exhibit altermagnetism contain <a href="https://www.earth.com/news/strong-magnetic-fields-leave-marks-on-nuclear-matter/" target="_blank" rel="noreferrer noopener">magnetic building blocks</a> that point antiparallel to one another, yet their crystal structure is rotated slightly relative to these neighboring units. 



"Altermagnets consist of magnetic moments that point antiparallel to their neighbors," Professor Wadley explains.



"However, each part of the crystal hosting these tiny moments is rotated with respect to its adjacent block. This is like <a href="https://www.sciencedirect.com/topics/physics-and-astronomy/antiferromagnetism#:~:text=Antiferromagnetism%20refers%20to%20the%20phenomenon,variation%20in%20susceptibility%20with%20temperature." target="_blank" rel="noreferrer noopener">antiferromagnetism</a> with a twist. But this subtle difference has huge ramifications."



<h2 class="wp-block-heading" id="h-bridging-magnetic-properties">Bridging magnetic properties</h2>



Altermagnets combine the favorable properties of ferromagnets and antiferromagnets in one material. 



Conventional magnets, such as iron, nickel, and cobalt, rely on aligned spins to deliver the familiar push-and-pull force of everyday magnets. 



In contrast, typical antiferromagnets cancel these forces, producing effects that are less noticeable from a distance. 



This new type links those features in a configuration that appears inactive from afar yet exhibits unique characteristics on a <a href="https://www.earth.com/news/transmitting-quantum-information-using-electron-spin/" target="_blank" rel="noreferrer noopener">nanoscopic scale</a>.



<h2 class="wp-block-heading" id="h-altermagnetism-and-synchrotrons">Altermagnetism and synchrotrons</h2>



A specialized synchrotron experiment at the <a href="https://www.maxiv.lu.se/" target="_blank" rel="noreferrer noopener">MAX IV</a> international facility in Sweden helped confirm these properties. The facility produces X-rays by accelerating electrons to near-light speeds. 



An ultra-thin wafer of manganese telluride was bathed in X-rays of different polarizations to reveal patterns reflecting previously unobserved magnetic activity. 



"Our experimental work has provided a bridge between theoretical concepts and real-life realization, which hopefully illuminates a path to developing altermagnetic materials for practical applications," explained Senior Research Fellow Oliver Amin, who led the experiment.



<h2 class="wp-block-heading" id="h-capturing-nanoscale-magnetic-patterns">Capturing nanoscale magnetic patterns</h2>



The synchrotron facility - a circular structure sometimes described as a giant metal doughnut - can generate high-intensity X-rays. 



Scientists used a specialized microscope to detect electrons emitted from the material's surface under X-ray illumination. 



This process created images of magnetism with nanoscale resolution. The direct view of altermagnetic features revealed a distinctive twist in the arrangement of magnetic moments.



<h2 class="wp-block-heading" id="h-revolutionizing-memory-technology">Revolutionizing memory technology</h2>



Industry experts note that magnetic materials represent a large and important part of current memory technology. 



Many <a href="https://www.earth.com/news/new-memory-crystal-data-storage-will-preserve-information-for-billions-of-years/" target="_blank" rel="noreferrer noopener">data-storage systems</a> rely on ferromagnets, which constitute an enormous global business and are also a significant source of energy consumption. 



Swapping conventional materials for altermagnets could significantly reduce reliance on heavy elements while cutting carbon emissions. 



The researchers believe this approach might allow speeds up to a thousand times faster than those of some existing microelectronic components.



Ph.D. student Alfred Dal Din has participated in experiments to explore how altermagnets can be applied in modern technology. 



"To be among the first to observe the effects and properties of this promising new class of magnetic materials during my Ph.D. has been an immensely rewarding and challenging privilege," Din enthused.



The group hopes that these findings will encourage broader investigations into how altermagnets operate under different conditions.



<h2 class="wp-block-heading" id="h-altermagnetism-and-large-scale-fields">Altermagnetism and large-scale fields</h2>



Engineers are already considering how to harness these special effects. Many existing designs rely on ferromagnets for long-term data storage because they offer a strong, consistent magnetic signal. 



Materials with a hidden magnetism that emerges on the nanoscale could be used in faster electronic switching or more <a href="https://www.earth.com/news/new-quantum-device-uses-crystal-layers-to-generate-entangled-photons/" target="_blank" rel="noreferrer noopener">compact memory</a> devices. 



Altermagnetism allows for the creation of structures that cancel large-scale fields while retaining a usable internal order.



<h2 class="wp-block-heading" id="h-environmental-and-economic-benefits">Environmental and economic benefits</h2>



This discovery may have implications for a wide range of products. In microelectronics, every extra bit of speed helps reduce lag and energy usage. 



Altermagnets show promise as a new platform for addressing the twin challenges of efficiency and performance. 



Because these materials can be grown in thin films, it becomes easier to integrate them into existing device architectures. 



They do not require the same rare resources used by many strong ferromagnets - a factor that could help lower costs and lessen the overall environmental impact of tech manufacturing.



The next phase of this work involves refining the methods used to control altermagnetism. Some experts note that many discoveries in magnetism take years to become standard in electronics. 



Whether altermagnets soon make their way into everyday devices or not, the findings highlight the importance of exploring new paths in physics to address modern challenges.



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Image -- Mapping an altermagnetic vortex pair in MnTe. The six colors, with arrows overlayed, show the direction of the altermagnetic ordering within the material. The size of the region shown is 1μm2. Credit: Oliver Amin, <a href="https://www.nottingham.ac.uk/" target="_blank" rel="noreferrer noopener">University of Nottingham</a>



The full study was published in the journal <a href="https://www.nature.com/articles/s41586-024-08234-x" target="_blank" rel="noreferrer noopener">Nature</a>.



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Physicists confirm the existence of a third form of magnetism

Researchers in Sweden have reported control over a new kind...

A new report reveals that more than one-third of all U.S. bird species stand in high or moderate conservation danger. Additionally, there are 112 “tipping point” species that have seen half or more of their populations vanish in the past 50 years.



The tipping point groups identified in the report include 42 red-alert species such as Allen’s Hummingbird, Tricolored Blackbird, and Saltmarsh Sparrow. These species are facing a high risk of <a href="https://www.earth.com/news/hundreds-of-bird-species-face-extinction-risks-in-the-neotropics/" target="_blank" rel="noreferrer noopener">extinction</a> unless swift interventions are made.



“Birds tell us that we have a full-on emergency across all habitats,” said Marshall Johnson, chief conservation officer at the <a href="https://www.audubon.org/" target="_blank" rel="noreferrer noopener">National Audubon Society</a>.



<h2 class="wp-block-heading" id="h-state-of-the-birds-report-nbsp">State of the Birds report&nbsp;</h2>



The 2025 U.S. State of the Birds report was unveiled at the 90th annual North American Wildlife and Natural Resources Conference in Louisville, Kentucky.&nbsp;



Compiled by a coalition of top science and conservation organizations, the report documents sustained widespread losses in American bird populations across mainland and marine habitats, highlighting 229 species requiring urgent conservation measures.&nbsp;



The findings follow on from the influential 2019 study that found the loss of three billion birds in North America over five decades.



<h2 class="wp-block-heading" id="h-significance-of-america-s-birds">Significance of America's birds</h2>



In defending birds, the report emphasizes not just the ecological arguments but also the financial rewards for local economies. 



Nearly 100 million Americans take part in bird-related activities, from casual backyard birding to dedicated expeditions. 



The total economic output connected to bird watching activities is $279 billion, while birding related activities support 1.4 million jobs, the experts argued, referencing the latest <a href="https://www.fws.gov/program/national-survey-fishing-hunting-and-wildlife-associated-recreation-fhwar" target="_blank" rel="noreferrer noopener">National Survey of Fishing, Hunting, and Wildlife-Associated Recreation</a> data.



The study emphasizes that birds are also central to <a href="https://www.earth.com/news/millions-of-americans-have-lost-years-of-time-to-poor-mental-health/" target="_blank" rel="noreferrer noopener">mental health</a> benefits. By citing existing research, the authors explain that daily or weekly encounters with birds and nature help relieve stress and diminish symptoms of anxiety and depression - an added incentive to strengthen conservation programs.



<h2 class="wp-block-heading" id="h-disturbing-trends-in-bird-habitats">Disturbing trends in bird habitats</h2>



In analyzing bird populations across America, the authors warn that nearly every type of ecosystem is witnessing declines. Even ducks, which had been a bright spot in past reports, are trending downward in more recent tallies.



“The rapid declines in birds signal the intensifying stressors that wildlife and people alike are experiencing around the world because of habitat loss, environmental degradation, and extreme weather events,” noted Amanda Rodewald, faculty director of the <a href="https://www.birds.cornell.edu/home/" target="_blank" rel="noreferrer noopener">Cornell Lab of Ornithology</a>’s Center for Avian Population Studies.&nbsp;



“When we see declines like those outlined in the report, we need to remember that if conditions are not healthy for birds, they’re unlikely to be healthy for us.”



<h2 class="wp-block-heading" id="h-cause-for-both-alarm-and-hope">Cause for both alarm and hope</h2>



“There is no doubt that the 2025 State of the Birds report is cause for alarm, but it is also cause for hope. Public interest in birds and the economic benefits from birding are at unprecedented levels, as is the information available about the status of each and every one of our bird species,” said Jeff Walters, conservation committee co-chair at the <a href="https://americanornithology.org/" target="_blank" rel="noreferrer noopener">American Ornithological Society</a>.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2025/03/bird-populations_united-states_rapid-decline_graph_credit-Cornell_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2025/03/bird-populations_united-states_rapid-decline_graph_credit-Cornell_1s.webp" alt="Long-term population trends for America's birds. Credit: State of the Birds long-term population trends, the Cornell Lab of Ornithology." class="wp-image-1962322"/></a><figcaption class="wp-element-caption">Long-term population trends for America's birds. Credit: State of the Birds long-term population trends, the Cornell Lab of Ornithology.</figcaption></figure>



Strategies for reversing these declines emerge throughout the document. The authors highlight conservation success stories and methods that have proven effective for waterfowl, waterbirds, and other avian groups, indicating that more robust action could yield results on a larger scale.



<h2 class="wp-block-heading" id="h-effective-conservation-approaches">Effective conservation approaches</h2>



“Many bird populations are struggling. But a proven blueprint for success is science-based planning and collaborative investment in <a href="https://www.earth.com/news/habitat-and-evolution-shape-the-unique-sounds-of-birds/" target="_blank" rel="noreferrer noopener">habitat</a> conservation,” said Steve Adair, Ducks Unlimited chief scientist.



Beyond this, practical measures - like private lands programs, ranching partnerships, forest renewal projects, coastal restoration efforts, and seabird translocation - have all shown promise in reviving bird populations under stress.&nbsp;



Adair cited the strong cooperation among hunters, landowners, agencies, and corporations as having historically benefited waterfowl numbers, at least where suitable weather conditions apply.



“Decades of strategic and aggressive wetland habitat conservation from hunters, landowners, state and federal agencies, and corporations has boosted numerous waterfowl and waterbird species when weather conditions are favorable. We’ve shown it works. And we must do more,” Adair said.



<h2 class="wp-block-heading" id="h-protecting-america-s-bird-life">Protecting America's bird life</h2>



At the same time, the report makes clear that bird conservation has ripple effects for human communities and broader ecosystems.



“Fortunately, many of the actions that are good for birds are good for us. When we protect the habitats that birds rely upon, we also protect the ecosystem services that sustain us,” Rodewald said.



In other words, robust protections for wetlands, coasts, <a href="https://www.earth.com/news/every-bird-song-can-help-scientists-make-smarter-forest-decisions/" target="_blank" rel="noreferrer noopener">forests</a>, and other key habitats not only safeguard bird life, but also maintain carbon storage, preserve water quality, and buffer cities and towns against natural disasters.



<h2 class="wp-block-heading" id="h-looking-toward-effective-solutions">Looking toward effective solutions</h2>



Michael J. Parr, President of <a href="https://abcbirds.org/" target="_blank" rel="noreferrer noopener">American Bird Conservancy</a>, praised ongoing research but emphasized that more support is crucial:



“We have clear evidence that conservation works in halting declines,” said Parr. “What we now need more than ever are programs and funding that match the scale of the greatest challenges birds face today. The science is solid on how to reverse the damage done, but to succeed, these issues need to be taken seriously.”



Marshall Johnson of the National Audubon Society reinforced this need for prompt and inclusive measures. 



“Birds unite us across the hemisphere and across the political spectrum - there should be no hesitation as we move to protect them today and in the future,” he said.



Ultimately, the 2025 U.S. State of the Birds report highlights a stark warning but also underscores the possibility for saving countless bird species if deliberate policies and robust support meet the urgency of the crisis.&nbsp;



Humans stand to benefit economically and culturally from an environment where bird populations thrive, reminding all stakeholders of the vital connections between <a href="https://www.earth.com/news/new-era-in-wildlife-conservation-how-ai-will-help-protect-elephants/" target="_blank" rel="noreferrer noopener">wildlife conservation</a> and broader social well-being.



The report can be found <a href="https://www.stateofthebirds.org/2025/" target="_blank" rel="noreferrer noopener">here</a>.



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Scientists declare a "full-on emergency" to save US bird populations

A new report reveals that more than one-third of all...

Barnard’s Star has long been a focus of interest for people who study worlds beyond our solar system. It sits about six light-years from Earth and is known for its quick motion across our sky.



For years, astronomers have wondered whether it might harbor planets that could help us understand how planetary systems form.



Now, they seem to have gotten their wish. Recent observations suggest there may be four miniature planets orbiting Barnard’s Star.



Each is calculated to be just 20 to 30% the mass of Earth and completes one full trip around the star in only a few days.



These findings have caught many people’s attention because they point to greater precision in detecting smaller, more elusive planets.



“It’s a really exciting find - Barnard’s Star is our cosmic neighbor, and yet we know so little about it,” said Ritvik Basant, Ph.D. student at the <a href="https://www.uchicago.edu/en" target="_blank" rel="noreferrer noopener">University of Chicago</a> and first author on the study. “It’s signaling a breakthrough with the precision of these new instruments from previous generations.”



<h2 class="wp-block-heading" id="h-understanding-barnard-s-star-the-basics">Understanding Barnard’s Star - the basics</h2>



Barnard’s Star first came to light in 1916, thanks to astronomer E. E. Barnard at <a href="https://yerkesobservatory.org/" target="_blank" rel="noreferrer noopener">Yerkes Observatory</a>. Ever since, scientists have been keeping an eye on it.



They nicknamed it a “great white whale” because people have often claimed to see planets there, only to be disappointed later. This time, the work is featured in The Astrophysical Journal Letters, dated March 11.



Observers used to rely on less sensitive equipment, which sometimes produced conflicting signals. That is one reason the star became such a legend among planet hunters, who occasionally thought they had proof but eventually realized their results were inconclusive.



Experts point out that Barnard’s Star is the closest single-star system after the Sun. In contrast, the nearest star system overall, <a href="https://www.earth.com/news/new-telescopes-can-directly-detect-signs-of-alien-life-in-exoplanet-atmospheres/" target="_blank" rel="noreferrer noopener">Proxima Centauri</a>, has three stars in a gravitational dance.



The difference matters because multiple stars complicate how planets might form, so an M dwarf star with just one companion star suggests a different environment for potential worlds.



<h2 class="wp-block-heading" id="h-hunting-planets-with-maroon-x">Hunting planets with MAROON-X</h2>



Astronomers cannot directly see tiny planets close to bright stars. Instead, they track the gentle pull each planet exerts on its star. 



A specialized instrument called <a href="https://www.gemini.edu/instrumentation/maroon-x" target="_blank" rel="noreferrer noopener">MAROON-X</a>, installed on the Gemini Telescope in Hawaii, can detect faint wobbles in a star’s light signal. With this approach, the group detected three planets around Barnard’s Star. 



The fourth emerged when they combined their work with data from an earlier observation, taken by an instrument called ESPRESSO in Chile.



“We observed at different times of night on different days. They’re in Chile; we’re in Hawaii. Our teams didn’t coordinate with each other at all,” said Basant. “That gives us a lot of assurance that these aren’t phantoms in the data.”



<h2 class="wp-block-heading" id="h-barnard-s-star-s-planets">Barnard's Star's planets</h2>



Scientists suspect the new finds are small, rocky worlds, though exact compositions are hard to confirm. 



The angle from Earth means these planets do not appear to pass in front of their star, so the usual tests to identify rock or gas are out of reach. 



However, these orbits are probably far too close to the star for comfortable conditions.



“We worked on this data really intensely at the end of December, and I was thinking about it all the time," reflected Jacob Bean, a professor at the University of Chicago.



“It was like, suddenly we know something that no one else does about the universe. We just couldn’t wait to get this secret out," Bean added.



A sense of excitement fueled the entire project. 



“A lot of what we do can be incremental, and it’s sometimes hard to see the bigger picture,” Bean enthused. “But we found something that humanity will hopefully know forever. That sense of discovery is incredible.”



<h2 class="wp-block-heading" id="h-what-happens-next">What happens next?</h2>



Barnard’s Star’s four worlds rank among the tiniest bodies confirmed with such radial velocity tools. 



Many <a href="https://www.earth.com/news/exotic-worlds-tess-unveils-126-new-exoplanets/" target="_blank" rel="noreferrer noopener">rocky exoplanets</a> discovered so far tend to be larger than Earth, and patterns among them appear consistent across the galaxy. 



Astronomers want to see if smaller ones show diverse compositions that might hint at how they form. 



M dwarfs, which are abundant in the universe, are known to have intense magnetic activity, and that may affect how planets develop. 



<h2 class="wp-block-heading" id="h-why-barnard-s-star-s-planets-are-important">Why Barnard's Star's planets are important</h2>



Understanding these processes could unlock clues about which stars are most likely to host stable surfaces.



Some hope these insights will guide future searches for life, even though these particular worlds lie in scorching territory. 



Researchers will keep refining their techniques to look for planets in more temperate zones. Each fresh advance in instrumentation increases the odds of uncovering new surprises. 



Additional surveys may also shed light on whether tiny planets form more often around cooler stars, or if conditions for habitability vary in unexpected ways. 



With every improved telescope, the possibility of spotting something remarkable grows.



The full study was published in <a href="https://iopscience.iop.org/article/10.3847/2041-8213/adb8d5" target="_blank" rel="noreferrer noopener">The Astrophysical Journal Letters</a>.



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New cosmic neighbors: Four planets discovered just 6 light years away

Barnard’s Star has long been a focus of interest for...

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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



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

Flu viruses are more flexible than expected

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

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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

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

Big Bend National Park&nbsp;is an American&nbsp;national park&nbsp;located in&nbsp;West Texas, bordering Mexico. The park has national significance as the largest protected area of&nbsp;Chihuahuan Desert&nbsp;topography&nbsp;and&nbsp;ecology&nbsp;in the United States, and was named after a&nbsp;large bend&nbsp;in the&nbsp;Rio Grande/Río Bravo. &nbsp;The park protects more than 1,200 species of plants, more than 450 species of birds, 56 species of reptiles, and 75 species of mammals. Additional park activities include scenic drives, programs led by Big Bend park rangers, and stargazing.



There are&nbsp;four&nbsp;campgrounds in Big Bend National Park. The National Park Service (NPS) operates three developed frontcountry campgrounds that provide drinking water and restroom facilities. In addition, a full hookup RV camping area is operated by the park concessioner, Forever Resorts. Reservations are required for Big Bend National Park Campgrounds. Reservations can be made by visiting&nbsp;recreation.gov. For visitors with rugged vehicles, or the willingness to leave the road behind and backpack into the wild, Big Bend provides options for&nbsp;backcountry camping. A backcountry permit is required for all backcountry camping and river trips.

Crater Lake National Park, Oregon

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