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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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Young, massive stars in the Triangulum Galaxy

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

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



Image Credit: NASA Earth Observatory



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Fedchenko Glacier in the Pamir Mountains

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

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>



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



“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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NGC 5643: Secrets of a spiraling galactic powerhouse

Today's Image of the Day from NASA Earth Observatory features an astronaut view of Mount Nemrut, a volcano located in eastern Turkey near Lake Van.



Mount Nemrut is notable for its immense caldera, which was formed through a series of <a href="https://www.earth.com/news/volcanic-eruptions-play-an-overlooked-role-in-earths-climate/" target="_blank" rel="noreferrer noopener">eruptions</a>. The caldera, one of the largest in the world, now contains several lakes such as Lake Nemrut.&nbsp;



"The eastern half of the caldera is partially filled by solidified lava flows from past eruptions. Snow cover present at the time of this photo accentuates pressure ridges that formed as the lava was flowing and cooling," noted <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>.



"These pressure ridges vary in size, thickness, and orientation due to the varying viscosity and flow direction of the lavas during eruptions."



<h2 class="wp-block-heading" id="h-formation-of-lake-nemrut">Formation of Lake Nemrut</h2>



"Lake Nemrut (Nemrut Gölü) occupies the western half of the caldera, creating a rough crescent shape that partially submerges the old lava flows," said NASA.



"This freshwater lake, reaching up to 176 meters deep, is accompanied by a smaller lake at the upper-center of the caldera."



The lake was formed after the collapse of the Nemrut volcano's summit. This collapse created a massive crater, which gradually filled with water over time, forming 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">lake</a>.



<h2 class="wp-block-heading" id="h-unesco-world-heritage-site">UNESCO World Heritage Site </h2>



Mount Nemrut and its surroundings are part of a protected UNESCO World Heritage Site due to their ecological and geological significance.



The site is home to diverse wildlife, including various bird species that use the lake as a stopover during migration. The caldera also contains smaller lakes and wetlands, adding to the area's biodiversity.



Lake Nemrut is a popular destination for tourists, hikers, and nature enthusiasts, offering stunning views of the volcanic landscape.



Despite its popularity, the lake remains relatively remote and unspoiled, contributing to its appeal as a natural wonder.



<h2 class="wp-block-heading" id="h-mount-nemrut-has-shaped-the-landscape">Mount Nemrut has shaped the landscape</h2>



Geologically, Mount Nemrut is interesting because its <a href="https://www.earth.com/news/new-research-enhances-predictions-on-volcanic-eruptions/" target="_blank" rel="noreferrer noopener">eruptions</a> have played a key role in shaping the local landscape. 



Its last major eruption occurred around 1441 AD, which indicates that it's not currently active but is considered dormant.



The area around Nemrut is known for its geothermal activity, including hot springs and fumaroles, suggesting that there is still significant heat beneath the surface.



Over thousands of years, various civilizations have inhabited the region around Nemrut, leaving behind a wealth of archaeological sites.



<h2 class="wp-block-heading" id="h-tribute-to-a-king">Tribute to a king</h2>



The summit of Mount Nemrut is dominated by a vast funerary mound constructed by King Antiochus I Theos, who ruled the Kingdom of Commagene in the 1st century BCE. 



The site was intended to serve as his tomb sanctuary and a place to commemorate the king's vision of divine kingship and unity between Eastern and Western cultures.



The mound, made of loose crushed stones, measures about 50 meters (164 feet) in height and spans a diameter of 150 meters (492 feet), creating an imposing feature visible from afar.



Surrounding the mound are terraces on the eastern, western, and northern sides, each adorned with colossal statues and reliefs. The statues, ranging in height from 8 to 10 meters (26 to 33 feet), represent various deities, including Zeus, Apollo, Hercules, and the goddess Tyche, alongside King Antiochus himself. 



The heads of the statues, many of which have toppled over due to <a href="https://www.earth.com/news/new-map-shows-75-percent-of-the-u-s-at-risk-of-damaging-earthquakes/" target="_blank" rel="noreferrer noopener">earthquakes</a> and erosion, lie scattered around the site, creating an iconic and enigmatic scene.



<h2 class="wp-block-heading" id="h-spiritual-and-religious-practices">Spiritual and religious practices</h2>



In addition to the statues, inscriptions at Mount Nemrut provide valuable historical information about the kingdom, the king's lineage, and the religious practices of the time.



The site is not only a marvel of ancient engineering but also a spiritual and astronomical center. Scholars believe the terraces were aligned with celestial events, serving as an observatory for solstices and equinoxes.



In addition to its natural and historical significance, the Nemrut volcano has been the subject of scientific study, as researchers aim to understand more about <a href="https://www.earth.com/news/volcanic-eruptions-play-an-overlooked-role-in-earths-climate/" target="_blank" rel="noreferrer noopener">volcanic activity</a> in the region, the history of its eruptions, and the potential risks it may pose in the future.



Image Credit: NASA Earth Observatory



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Mount Nemrut: Ancient mysteries and natural marvels 

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 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  

Hurricane Patricia Passes Over Mexico. As it roared towards southwestern Mexico on October 23, 2015, the fast-forming and short-lived Hurricane Patricia began setting records. Early in the day it became the most powerful hurricane ever recorded in the Western Hemisphere, with maximum sustained winds speeds reaching 200 mph (321.8 km/h) according to the National Hurricane Center (NHC). The storm set another record as the minimum central pressure dropped to a record-low of 880 millibars (25.99 inches of mercury) at about 10 a.m. EDT that same day. Then, at 7:15 p.m. EDT that evening, Hurricane Patricia became the strongest landfalling Pacific hurricane on record.

The Moderate Resolution Imaging Spectroradiometer (MODIS) aboard <a href="https://en.wikipedia.org/wiki/NASA">NASA’s</a> Aqua satellite captured this true-color image at 20:35 UTC (4:35 p.m. EDT) on October 23, just three hours before it made landfall. The center of circulation is just off the western coast of Mexico while the leading storm bands spread across the country and reach the waters of the Gulf of Mexico.

The first advisories on Patricia were issued on October 20, and it reached peak strength as a Category 5 hurricane, based on the Saffir-Simpson Hurricane Wind Scale, on October 23. Once slamming into Mexico, Patricia lost strength quickly, going from a strong Category 4 hurricane to a tropical depression within 24 hours on October 24. It then became a remnant low pressure area and combined with a low pressure area over Texas to create a torrential and flooding rain situation in Texas, Louisiana, and Mississippi. Up to 20 inches of rain were reported in Texas and up to 12 in inches fell in Mississippi and Louisiana.

Although life as a hurricane was brief, the remnants continue to bring rain across the southeast and southern plains of the United States. Rain from this system is due to reach the Washington, D.C. area on October 28.

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<a href="http://www.nasa.gov" target="_blank" rel="noopener noreferrer">NASA</a>

Hurricane Patricia Passes Over Mexico

Could the decades-long mystery of unusual star movements in Omega Centauri, the largest star cluster in the Milky Way, finally be solved?



Located in the constellation Centaurus, Omega Centauri is a massive cluster containing nearly ten million stars. Astronomers have long puzzled over the unexpected high velocities of stars near its center. 



The debate centers on whether these movements are caused by an “<a href="https://www.earth.com/news/intermediate-mass-black-holes-survive-and-thrive-in-giant-star-clusters/" target="_blank" rel="noreferrer noopener">intermediate-mass black hole</a>” (IMBH), weighing around 100,000 times the mass of the Sun, or a cluster of smaller “stellar-mass” black holes, each just a few times the Sun's mass.



<h2 class="wp-block-heading" id="h-a-cluster-or-a-singular-giant">A cluster or a singular giant?</h2>



Astronomers have theorized that Omega Centauri’s center might host a cluster of black holes, naturally forming through stellar evolution. 



However, experts also speculated that most of these black holes would have been ejected over time due to gravitational interactions with other stars, which made the presence of a single intermediate-mass black hole more plausible.



The case for an IMBH gained further strength when new evidence suggested that certain fast-moving stars near the cluster's center could only achieve such speeds through interactions with a massive <a href="https://www.earth.com/news/high-speed-stars-reveal-hidden-black-hole-in-omega-centauri/" target="_blank" rel="noreferrer noopener">black hole</a>.



<h2 class="wp-block-heading" id="h-formation-of-supermassive-black-holes">Formation of supermassive black holes</h2>



IMBHs are particularly intriguing to astronomers as they might represent a missing link between stellar-mass black holes and supermassive black holes.&nbsp;



Stellar-mass black holes form when massive stars collapse, while supermassive black holes - millions to billions of times the Sun's mass - dominate the centers of large galaxies. 



Understanding how <a href="https://www.earth.com/news/how-do-black-holes-become-supermassive/" target="_blank" rel="noreferrer noopener">supermassive black holes</a> form - possibly starting as IMBHs - remains one of astronomy's greatest mysteries.



<h2 class="wp-block-heading" id="h-star-velocities-in-omega-centauri">Star velocities in Omega Centauri</h2>



In a fresh approach to this enigma, researchers from the <a href="https://www.surrey.ac.uk/">University of Surrey</a>, the <a href="https://www.iac.es/" target="_blank" rel="noreferrer noopener">Instituto de Astrofísica de Canarias</a> (IAC, Spain), and the Annecy-le-Vieux Laboratoire de Physique Théorique (France) examined the anomalous star velocities in Omega Centauri using a new type of data: pulsar accelerations.



<a href="https://www.earth.com/news/pulsars-are-helping-astronomers-pinpoint-dark-matter/" target="_blank" rel="noreferrer noopener">Pulsars</a> are remnants of dying stars, typically weighing up to twice the Sun’s mass but only about 20 kilometers in diameter. Spinning up to 700 times per second, they emit radio waves in a lighthouse-like pattern that sweeps past Earth.&nbsp;



Acting as natural, highly precise clocks, pulsars allow scientists to measure their accelerations and, in turn, the gravitational forces acting on them.



For the first time, the team combined pulsar acceleration measurements with data on star velocities. This innovative approach enabled them to probe the gravitational field at the cluster’s center and differentiate between the effects of an IMBH and a cluster of stellar-mass black holes.&nbsp;



The results leaned toward the latter explanation: a cluster of smaller black holes rather than a single IMBH.



<h2 class="wp-block-heading" id="h-the-hunt-for-intermediate-mass-black-holes">The hunt for intermediate-mass black holes </h2>



“The hunt for elusive intermediate-mass black holes continues. There could still be one at the center of Omega Centauri, but our work suggests that it must be less than about six thousand times the mass of the Sun and live alongside a cluster of stellar-mass black holes,” noted study co-author Justin Read, an astronomer at the University of Surrey. 



“There is, however, every chance of us finding one soon. More and more pulsar accelerations are coming, allowing us to peer into the centers of dense star clusters and hunt for black holes more precisely than ever before.”



<h2 class="wp-block-heading" id="h-significance-of-studying-omega-centauri">Significance of studying Omega Centauri </h2>



Study lead author Andrés Bañares Hernández, an astronomer at IAC, noted that we have long known about supermassive black holes at galaxy centers and smaller stellar-mass black holes within our own galaxy.&nbsp;



“However, the idea of intermediate-mass black holes, which could bridge the gap between these extremes, remains unproven,” said Hernández.



“By studying Omega Centauri - a remnant of a dwarf galaxy - we have been able to refine our methods and take a step forward in understanding whether such black holes exist and what role they might play in the evolution of star clusters and galaxies." 



"This work helps resolve a two-decade-long debate and opens new doors for future exploration.”



<h2 class="wp-block-heading" id="h-pulsars-a-key-to-further-discoveries">Pulsars: A key to further discoveries</h2>



The researchers also highlighted Omega Centauri as a prime environment for studying the formation and behavior of pulsars, given the cluster’s density and gravitational complexity.&nbsp;



The recent discovery of numerous pulsars within Omega Centauri has provided new opportunities to investigate their origins.



“The formation of pulsars is also an active field of study because a large number of them have recently been detected. Omega Centauri is an ideal environment to study models of their formation, which we have been able to do for the first time in our analysis," Hernández noted.



While the mystery of an IMBH in Omega Centauri remains unresolved, this study represents a significant step forward.&nbsp;



The new data and techniques for analyzing gravitational fields and pulsar accelerations could soon reveal whether intermediate-mass black holes exist and, if so, what role they play in the <a href="https://www.earth.com/news/webb-telescope-confirms-hubble-constant-our-understanding-of-universe-expansion-very-wrong/" target="_blank" rel="noreferrer noopener">universe</a>’s cosmic architecture.



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Mysterious star movement in Omega Centauri may finally be explained

Could the decades-long mystery of unusual star movements in Omega...

Humpback,Whale,Breaching.,Humpback,Whale,Jumping,Out,Of,The,Water.

Humpback whales have long impressed us with their incredible travel distances, often covering thousands of miles between feeding and breeding areas. 



Scientists recently recorded an adult male humpback whale making an unexpected journey from South America to Africa, traveling more than 8,106 miles (13,046 kilometers). 



This new finding suggests there is still much to learn about how whales spread across oceans, especially in the Southern Hemisphere.



“These animals are distinct individuals, and they’ll do surprising things. These oceans are very much connected spaces, and whales travel beyond borders," enthused Ted Cheeseman, a marine biologist at <a href="https://www.scu.edu.au/" target="_blank" rel="noreferrer noopener">Southern Cross University</a>.



<h2 class="wp-block-heading" id="h-record-breaking-journey">Record-breaking journey</h2>



A new study detailed this whale’s journey as the longest migration ever recorded for <a href="https://www.earth.com/news/ai-helps-humans-have-20-minute-conversation-with-humpback-whale-named-twain/" target="_blank" rel="noreferrer noopener">a single whale</a>. The trek also marked the first time researchers documented an adult male humpback traveling between the Pacific and Indian oceans. 



The whale was first spotted off the coast of Colombia in 2013 and seen again near that area a few years later. But in 2022, it turned up near Zanzibar, off the coast of East Africa. 



Researchers noted that the typical migration route can exceed 4,971 miles (8,000 kilometers) one way, and this whale’s path was close to twice that distance, according to the study published in the journal Royal Society Open Science.



<h2 class="wp-block-heading" id="h-humpback-whale-travel-behavior">Humpback whale travel behavior</h2>



Scientists say this unexpected movement sheds light on how adaptable humpbacks can be. They say that global data are needed to better <a href="https://www.earth.com/news/how-a-warming-climate-will-change-the-humpback-whales-diet/" target="_blank" rel="noreferrer noopener">understand whale behavior</a>. 



Such large-scale research could show how whales respond to environmental changes and whether factors like shifting ocean temperatures or reduced food availability push them to seek new territories. 



The whale’s travel between distinct breeding grounds highlights that humpbacks, while often returning to the same places, are not completely predictable. 



“Our dogmatic thinking is that (whales) always go to the place where they came from,” said Ari Friedlaender, professor of ocean sciences at the <a href="https://www.ucsc.edu/" target="_blank" rel="noreferrer noopener">University of California, Santa Cruz</a>, who was not involved in the study. 



“But there has to be some movement where you get some (animal) explorers that decide, for whatever reason, to follow a different path," Friedlaender told CNN.



<h2 class="wp-block-heading" id="h-tracking-a-unique-individual">Tracking a unique individual</h2>



Humpbacks exist in <a href="https://www.earth.com/news/humpback-whales-have-moved-their-singing-rituals-away-from-shorelines/" target="_blank" rel="noreferrer noopener">oceans all over the world</a> and are known for covering huge distances. This whale’s journey stands out because it involved switching between two separate breeding areas. 



Males often travel widely when competing for mates, and scientists note that these movements may depend on shifting conditions. 



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/12/humpback-whale_record-migration_sightings-map_credit-Meynecke_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/12/humpback-whale_record-migration_sightings-map_credit-Meynecke_1s.webp" alt="The sighting locations of the male humpback whale between the breeding grounds G and C. Squares represent primary feeding grounds of the Southern Hemisphere humpback whale breeding stocks (BS) G, A, B and C, with the latter split into C1 southern (C1S) and C1 northern (C1N) extents, C2, C3 and C4. Semicircles represent their respective core breeding grounds. Credit: Seyboth E, Meynecke JO, de Bie J, Roychoudhury A, Findlay K." class="wp-image-1953566"/></a><figcaption class="wp-element-caption">The sighting locations of the male humpback whale between the breeding grounds G and C. Squares represent primary feeding grounds of the Southern Hemisphere humpback whale breeding stocks (BS) G, A, B and C, with the latter split into C1 southern (C1S) and C1 northern (C1N) extents, C2, C3 and C4. Semicircles represent their respective core breeding grounds. Credit: Seyboth E, Meynecke JO, de Bie J, Roychoudhury A, Findlay K. </figcaption></figure>



They tracked the whale using a platform called <a href="https://happywhale.com/home" target="_blank" rel="noreferrer noopener">Happy Whale</a>, which Cheeseman cofounded. It lets citizen scientists, researchers, and whale watchers share their whale photos, helping experts identify whales by the unique underside of their tails. 



“When (whales) dive, they lift their tails, and anyone taking a picture of their tail can record the identity of the animal,” Cheeseman said.



<h2 class="wp-block-heading" id="h-changing-patterns-in-a-changing-world">Changing patterns in a changing world</h2>



Humpbacks generally show strong loyalty to their breeding sites, though occasional shifts happen. 



Researchers do not fully understand why whales change their breeding locations, but they see that males and females can both move between different spots. 



Scientists think that environmental conditions, competition, and mate availability may influence these changes. Instead of repeating their old routes, some whales may strike out in new directions. 



Cheeseman explained that the whale in this study may have left Colombia due to competition with other males for mates or because of food scarcity, noting that these conditions might push whales to <a href="https://www.earth.com/news/humpback-whales-perform-full-body-scrubs-on-their-return-south/" target="_blank" rel="noreferrer noopener">explore new waters</a>.



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



In the 20th century, whaling in the Indian Ocean killed nearly 95% to 99% of the humpback population there, according to Cheeseman. 



That leaves many questions unanswered about their current habits. Researchers say that understanding <a href="https://www.earth.com/news/add-humpback-whales-to-list-of-animals-that-build-and-use-tools/" target="_blank" rel="noreferrer noopener">modern humpback behavior</a> is like observing a classroom full of youngsters without many older individuals around. 



“We’re looking at their behavior like going into a kindergarten classroom,” Cheeseman said. “There’s maybe one adult, someone who’s middle-aged and a whole bunch of children.” 



These shifting demographics mean whales are making new cultural patterns, and unexpected movements could shape how these creatures interact with each other.



<h2 class="wp-block-heading" id="h-documenting-humpback-whale-travel">Documenting humpback whale travel</h2>



Since the 1970s, whale watchers and scientists have used tail photography to identify individuals. Platforms like Happy Whale now let many people submit images, broadening the amount of information available. 



Cheeseman noted that the database currently includes around 109,000 individual whales. The increased collaboration encourages more inclusive <a href="https://www.earth.com/news/humpback-whales-fail-to-respond-to-vessel-noise/" target="_blank" rel="noreferrer noopener">research projects worldwide</a>. 



“(Happy Whale) is going to bring more opportunity for sharing and networking to make our global research partnerships more inclusive,” Friedlaender said.



<h2 class="wp-block-heading" id="h-uncertain-futures-and-new-connections">Uncertain futures and new connections</h2>



This whale’s travel outside its usual breeding pattern raises questions about acceptance in its new location. Changes in travel routes may mean whales encounter different populations. 



As these movements occur, whales could begin mixing genes and behaviors, influencing how future generations migrate and <a href="https://www.earth.com/news/humpback-whales-felt-less-stressed-during-the-pandemic/" target="_blank" rel="noreferrer noopener">choose their homes</a>. 



Cheeseman said that new sightings will provide more clues. “With every photograph we receive we’re looking for every whale we know,” Cheeseman said.



<h2 class="wp-block-heading" id="h-humpback-whale-travel-creates-communities">Humpback whale travel creates communities</h2>



The Indian Ocean now holds younger populations of humpbacks trying to find their way. Some may follow old patterns, while others search for new possibilities. 



In addition, shifts in migration might change social bonds and behaviors.



“These different paths can connect populations that we otherwise would never think would be in touch with each other to share information and genes that make these populations into more of a global community," Friedlaender concluded.



No one can say when or where this whale will appear next, but future sightings and photographs may deepen our understanding. The world’s oceans hold many secrets about how humpbacks live, move, and interact. 



As more data come to light, researchers and regular folks can pool their knowledge, helping piece together how whales adapt to changing waters and shifting relationships.



The full study was published in the journal <a href="https://royalsocietypublishing.org/doi/10.1098/rsos.241361" target="_blank" rel="noreferrer noopener">Royal Society Open Science</a>.



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Humpback whale travels farther than any mammal ever recorded

Humpback whales have long impressed us with their incredible travel...

Have you ever wondered how our brain stores memories? For two decades, it has been acknowledged that electrical waves in our brains during deep sleep have a crucial role in memory formation. However, the details of this process have remained a mystery. 



Following an extensive study, a team of researchers from <a href="https://www.charite.de/en/" target="_blank" rel="noreferrer noopener">Charité - Universitätsmedizin Berlin</a> has proposed a compelling explanation.



<h2 class="wp-block-heading" id="h-deep-sleep-and-memory-formation">Deep sleep and memory formation </h2>



How do memories become permanent? Most experts agree that while we are immersed in the land of dreams, our brains have a quick recap of the day's happenings. Here's how it works.



The short-term memory info in the hippocampus is transferred to the long-term memory in the neocortex. 



The unsung heroes of this operation are "slow waves." These are slow, synchronous oscillations of electrical voltage in the cortex that occur during our deepest sleep phase.



"We’ve known for many years that these slow waves contribute to the formation of memory. When slow-wave sleep is artificially augmented from outside, memory improves," explained Professor Jörg Geiger.



But there's been a lingering question - what exactly is happening inside our heads when this process occurs?



<h2 class="wp-block-heading" id="h-slow-waves-and-brain-connectivity">Slow waves and brain connectivity </h2>



"Synaptic mechanisms that contribute to human <a href="https://www.earth.com/news/how-does-our-brain-form-long-term-memories/" target="_blank" rel="noreferrer noopener">memory consolidation</a> remain largely unexplored. Consolidation critically relies on sleep," noted the researchers.



"During slow wave sleep, neurons exhibit characteristic membrane potential oscillations known as UP and DOWN states. Coupling of memory reactivation to these slow oscillations promotes consolidation, though the underlying mechanisms remain elusive."



To put it simply, these slow electrical waves influence the strength of synaptic connections between the neurons in the neocortex, and thus their receptivity.



<h2 class="wp-block-heading" id="h-mysterious-mechanisms-of-memory-formation">Mysterious mechanisms of memory formation </h2>



With the use of unique, intact human brain tissue, the team has been able to uncover some of the processes that are linked to memory formation during <a href="https://www.earth.com/news/deep-sleep-improves-memory-formation-and-recall/" target="_blank" rel="noreferrer noopener">deep sleep</a>.



The study was focused on tissue samples from 45 patients who had undergone treatment for epilepsy or a <a href="https://www.earth.com/news/how-antidepressants-could-help-treat-brain-tumors/" target="_blank" rel="noreferrer noopener">brain tumor</a> at Charité, the Evangelisches Klinikum Bethel (EvKB) hospital, or the University Medical Center Hamburg-Eppendorf (UKE).



The experts managed to simulate the voltage fluctuations of slow waves during deep sleep in this tissue, then gauged the response of the nerve cells.



<h2 class="wp-block-heading" id="h-the-timing-of-long-term-memory-storage">The timing of long-term memory storage</h2>



The researchers discovered that synaptic connections between neurons in the neocortex peak at a very specific moment during the voltage fluctuations. They found that the synapses function most efficiently right after the voltage swings from low to high.



"During that brief time window, the cortex can be thought of as having been placed in a state of elevated readiness. If the brain plays back a memory at exactly this time, it is transferred to long-term memory especially effectively,” explained Franz Xaver Mittermaier, lead author of the study.



Worldwide, research groups are exploring ways to use electrical impulses or auditory signals to influence slow waves during sleep. Current stimulation approaches are optimized through the trial-and-error method, which is time-consuming and laborious.



This new understanding of the "perfect timing" could aid in devising methods to boost memory formation more efficiently.



<h2 class="wp-block-heading" id="h-enhancing-memory-through-sleep">Enhancing memory through sleep</h2>



The insights from this study open the door to new applications for memory enhancement. By understanding the exact timing when synaptic connections are most effective, researchers can refine techniques to influence slow-wave activity.



This could revolutionize treatments for memory-related conditions, such as <a href="https://www.earth.com/news/how-why-some-brains-resist-alzheimers-disease-symptoms/" target="_blank" rel="noreferrer noopener">Alzheimer’s disease</a> or age-related cognitive decline.



Beyond clinical applications, optimizing memory during sleep could benefit learning and performance, offering new possibilities for education and skill acquisition.



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



The findings of this research extend beyond memory formation and cognitive impairment. By deepening our understanding of how the brain operates during <a href="https://www.earth.com/news/sleep-is-essential-for-memory-formation/" target="_blank" rel="noreferrer noopener">sleep</a>, scientists can explore innovative applications in various fields.



For instance, optimizing sleep-related brain activity could aid in treating sleep disorders or managing stress-related conditions. 



Additionally, this knowledge might inspire advances in technology, such as brain-computer interfaces designed to enhance cognitive performance. The findings may even lead to memory retention training programs that are tailored to individual sleep patterns.



Ultimately, the potential to harness the power of deep sleep could transform how we approach mental health and neurological well-being.



The full study was published in the journal <a href="https://www.nature.com/articles/s41467-024-53901-2" target="_blank" rel="noreferrer noopener">Nature Communications</a>.



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Experts pinpoint the exact timing of memory formation during sleep

Have you ever wondered how our brain stores memories? For...

Deep meditative states are often described as “pure consciousness experiences,” where individuals feel alert but do not perceive anything other than “awareness itself.” These states of meditation are frequently characterized as "timeless," with no sense of past, future, or any other temporal features. 



Yet, a paradox emerges: if one is consciously aware and alert, wouldn’t one also be aware of the passage of time? Can these profound meditative states genuinely be devoid of any temporal dimension?



<h2 class="wp-block-heading" id="h-understanding-timeless-meditation">Understanding timeless meditation</h2>



In an article published in <a href="https://dx.doi.org/10.1093/pq/pqae081" target="_blank" rel="noreferrer noopener">The Philosophical Quarterly</a>, Professor Akiko Frischhut from <a href="https://www.sophia.ac.jp/eng/" target="_blank" rel="noreferrer noopener">Sophia University</a> in Japan examines this intriguing contradiction.



“My paper aims to give a coherent conceptualization of deep meditative states, focusing in particular on phenomenal temporality during meditation,” she explained. 



“The central question is whether it is possible to have an experience that is completely timeless, without any temporal feature whatsoever.”



Thomas Metzinger, a prominent philosopher, has argued that first-person accounts of deep meditation from diverse cultures and eras consistently describe these states in strikingly similar terms. 



A common theme is that such states of meditation feel both “completely timeless” and “continuously ongoing.”



However, if something is described as “ongoing,” it implies the presence of duration, meaning that it cannot be entirely timeless. 



This contradiction forms the basis of Frischhut’s investigation. She argues that deep <a href="https://www.earth.com/news/mindfulness-meditation-is-a-powerful-weapon-against-chronic-pain/" target="_blank" rel="noreferrer noopener">meditative states</a> must inherently involve at least one minimal temporal quality: duration.



<h2 class="wp-block-heading" id="h-timeless-meditation-no-beginning-or-end">Timeless meditation: No beginning or end</h2>



To resolve this paradox, Frischhut introduces the “Extended Now Interpretation (ENI).” This concept identifies a critical ambiguity in the term “timeless.”&nbsp;



While some use the word to mean entirely devoid of any temporal features, others apply it to describe a state with an indeterminate duration that lacks specific temporal structures such as change, order, succession, beginning, or end.&nbsp;



Meditators may describe their experience as “timeless” because they perceive no temporal structure, even though they experience a sense of ongoing duration.



Frischhut’s argument suggests that deep meditative states occur within what can be described as an extended present. 



During these states, meditators perceive no change or progression of moments, yet they are immersed in an experience with duration. 



According to the ENI, “timelessness” refers not to the absence of <a href="https://www.earth.com/news/nature-experiences-alter-time-perception/" target="_blank" rel="noreferrer noopener">time</a> entirely but rather to the absence of any discernible temporal framework within the experienced duration.



<h2 class="wp-block-heading" id="h-alertness-in-deep-meditative-states">Alertness in deep meditative states</h2>



Frischhut delves deeper into the role of sustained <a href="https://www.earth.com/news/bright-light-instantly-enhances-brain-function-alertness/" target="_blank" rel="noreferrer noopener">alertness</a> in providing meditators with an implicit awareness of duration, even in the absence of explicit temporal markers.&nbsp;



This form of alertness, found in deep meditative states, can be thought of as a poised state of attention. Over time, meditators either maintain this alert state or slip into less attentive conditions.



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/12/meditation_awareness_time-perception_graphic_credit-Sophia-University_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/12/meditation_awareness_time-perception_graphic_credit-Sophia-University_1s.webp" alt="In this study, a researcher from Sophia University presents an in-depth analysis of how and why deep meditative states are often described as &quot;atemporal&quot; or &quot;timeless.&quot; Credit: Akiko Frischhut from Sophia University, Japan" class="wp-image-1953771"/></a><figcaption class="wp-element-caption">In this study, a researcher from Sophia University presents an in-depth analysis of how and why deep meditative states are often described as "atemporal" or "timeless." Credit: Akiko Frischhut from Sophia University, Japan</figcaption></figure>



The choice to remain alert -- or the potential to lose alertness -- provides a subtle sense of time’s passage, Frischhut argues. This awareness does not require meditators to consciously track successive moments. 



Instead, the very act of maintaining attention creates an awareness of duration, even without recognizing the progression of one moment to the next.



<h2 class="wp-block-heading" id="h-addressing-the-lack-of-memory">Addressing the lack of memory</h2>



A significant challenge to Frischhut’s argument lies in the fact that meditators often report an absence of memory during these deep states.&nbsp;



Without <a href="https://www.earth.com/news/sleep-is-essential-for-memory-formation/">memory</a>, how can one perceive any sense of time? To address this, Frischhut posits that the experience of alertness itself carries a unique phenomenological quality that distinguishes it from a lack of alertness.



She draws an analogy to hearing two consecutive knocks on a door: the second knock feels different because it follows the first. 



Similarly, even without conscious memory, the flow of alertness from one moment to the next provides meditators with an implicit awareness of duration. 



This seamless continuity of momentary alertness allows meditators to experience a sense of ongoing presence, even without actively recalling or recognizing previous moments.



<h2 class="wp-block-heading" id="h-this-is-cool-but-why-does-it-matter">This is cool, but why does it matter?</h2>



This analysis sheds new light on the nature of deep meditative states and helps clarify reports that have emerged consistently throughout human history.&nbsp;



Frischhut, whose academic focus includes unusual states of consciousness, hopes her findings will spark further discussion in this relatively underexplored area.



“In my opinion, non-ordinary states of <a href="https://www.earth.com/news/consciousness-may-stem-from-unseen-dimensions-beyond-our-reality/" target="_blank" rel="noreferrer noopener">consciousness</a> such as deep meditative states, dreams, and psychedelic states have not been sufficiently investigated in contemporary philosophy,” Frischhut said.



She emphasizes that exploring how time is perceived in these altered states could offer profound insights into human cognition and the workings of the mind.&nbsp;



By examining the subtle dynamics of phenomenal temporality, Frischhut’s work paves the way for a deeper understanding of how we experience time across both ordinary and extraordinary states of consciousness.



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No past, no future: Why deep meditation experiences feel 'timeless'

Deep meditative states are often described as “pure consciousness experiences,”...

Concerns about TikTok’s influence on youth are common, but a new study led by Emilie Owens provides a more nuanced view.&nbsp;



Published in the journal <a href="https://dx.doi.org/10.3366/ircl.2024.0562" target="_blank" rel="noreferrer noopener">International Research in Children's Literature</a>, the study explores how TikTok shapes teenagers' lives and behaviors, offering insights that challenge the platform’s negative reputation.



<h2 class="wp-block-heading" id="h-teenagers-and-their-phones">Teenagers and their phones</h2>



Owens, a doctoral student in media studies at the <a href="https://www.uio.no/english/" target="_blank" rel="noreferrer noopener">University of Oslo</a>, set out to better understand the relationship between teenagers and their phones. “My goal has been to get to know teenagers and their phones. I wanted to be in the room with them,” she explained.&nbsp;



Her curiosity was driven by the often critical attitudes adults hold toward TikTok.&nbsp;



While acknowledging its commercial downsides, Owens emphasizes the positive role the platform can play for teens. “<a href="https://www.earth.com/news/internet-addiction-impairs-brain-function-in-teenagers/" target="_blank" rel="noreferrer noopener">Teenagers</a> in my research say that TikTok makes them happy and provides comfort. They also see it as a social activity.”



<h2 class="wp-block-heading" id="h-exploring-teenagers-use-of-tiktok">Exploring teenagers’ use of TikTok</h2>



Over seven months, Owens conducted her study in an international high school in Oslo.&nbsp;



To capture authentic teenage behavior, she encouraged students to interact with TikTok as they normally would, occasionally assigning tasks such as finding or creating content.&nbsp;



By observing them in action, she gained a deeper understanding of their relationship with the platform.



Owens initially expected significant gender differences in TikTok use, but her findings painted a more complex picture.&nbsp;



While a small group of boys gravitated toward sarcastic, political, and controversial content, the majority of students - regardless of gender - focused on humorous memes, quirky videos, and educational material.



<h2 class="wp-block-heading" id="h-teenagers-learning-through-tiktok">Teenagers learning through TikTok</h2>



One surprising outcome of the study was how much teenagers claimed to learn from TikTok. A 16-year-old girl noted that TikTok often provided clear explanations of current events or academic topics.&nbsp;



“All of these controversies going on? There's always someone explaining it there. Or I have actually seen Russian ladies, like, describe math to me, and I understand it,” she said.&nbsp;



Similarly, a 17-year-old boy praised the platform’s short videos for getting “straight to the point without any explanation,” which he found particularly effective.



TikTok, Owens observed, often acts as a lens through which teenagers view the world. They use it in various contexts, from passing time while waiting for the bus to engaging socially by sharing videos with friends.&nbsp;



“In such cases, TikTok becomes a social focal point, a kind of lens through which they can see the world together,” Owens explained.&nbsp;



This shared experience can bridge cultural divides, particularly in international classrooms where students come from different backgrounds.



<h2 class="wp-block-heading" id="h-balancing-the-good-and-the-bad">Balancing the good and the bad</h2>



Despite TikTok’s positive aspects, teenagers are aware of its potential downsides. Some prefer YouTube, feeling it offers more substantial educational value. Others temporarily delete TikTok to focus on schoolwork.&nbsp;



One teenager mentioned the physical strain of prolonged use, noting that “after twelve hours, your eyes get sore.” While this may not be literal, it reflects the platform’s potential to consume significant amounts of time.



The content on TikTok also elicited mixed reactions. Teenagers recognized that the type of accounts they follow could influence their mood and motivation.&nbsp;



As one 16-year-old boy put it:&nbsp; “If you follow a certain type of people, it can be motivating. But if you follow a certain group, it can be very demotivating as well.”&nbsp;



The term “brain rot” was humorously used by the teens to describe the sillier, less meaningful content, though they didn’t take this label too seriously.



<h2 class="wp-block-heading" id="h-a-customized-digital-world">A customized digital world</h2>



Owens reflects on what it means for today’s teenagers to grow up with TikTok. The platform offers a highly customized experience, where users can easily move on to something else if they don’t like what they see.&nbsp;



“It certainly gives them a more customized world. They learn to expect things to be the way they want them,” Owens noted.&nbsp;



While the long-term implications remain unclear, she suggests this tailored digital environment could shape their expectations and interactions in significant ways.



<h2 class="wp-block-heading" id="h-complex-relationship-between-teenagers-and-tiktok-nbsp">Complex relationship between teenagers and TikTok&nbsp;</h2>



For parents, Owens points to the work of University of Oslo professor Elisabeth Staksrud, who emphasizes the importance of parental involvement in teenagers’ digital lives.&nbsp;



Owens echoes this advice: “It’s probably wise to be realistic. Young people use <a href="https://www.earth.com/news/spending-less-time-on-social-media-improves-your-mental-health/" target="_blank" rel="noreferrer noopener">social media</a> now, and it’s an important part of their lives. Approach it as you would any other issue in a teenager’s life. Ask them what’s happening and show that you care.”



Owens’ study reveals a nuanced relationship between teenagers and TikTok. While the platform poses challenges, it also offers opportunities for <a href="https://www.earth.com/news/secrets-of-learning-how-the-brain-stores-new-information/" target="_blank" rel="noreferrer noopener">learning</a>, social connection, and entertainment.&nbsp;



By understanding this balance, parents, educators, and researchers can better navigate the evolving digital landscape and support teenagers in making the most of their online experiences.



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Growing up in a digital world: TikTok makes teenagers happy

Concerns about TikTok’s influence on youth are common, but a...

Proper food intake is essential for pregnant humpback whales to complete their extraordinary annual migration between Hawaii and Alaska.&nbsp;



Researchers with the <a href="https://www.mmrphawaii.org/" target="_blank" rel="noreferrer noopener">Marine Mammal Research Program</a> (MMRP) at the <a href="https://www.himb.hawaii.edu/" target="_blank" rel="noreferrer noopener">Mānoa Hawaiʻi Institute of Marine Biology</a> (HIMB) have revealed the energetic demands and vulnerabilities of these migratory mothers-to-be.&nbsp;



The findings, published in <a href="https://dx.doi.org/10.1113/JP287304" target="_blank" rel="noreferrer noopener">The Journal of Physiology</a>, show that while the initial stages of pregnancy are relatively low in energy cost, the final trimester dramatically increases the mother’s energetic needs - just when she must fast and cover great distances without feeding.



<h2 class="wp-block-heading" id="h-humpback-whales-astonishing-migrations">Humpback whales’ astonishing migrations</h2>



<a href="https://www.earth.com/news/humpback-whales-felt-less-stressed-during-the-pandemic/" target="_blank" rel="noreferrer noopener">Humpback whales</a> feed in polar waters and then embark on <a href="https://www.earth.com/news/humpback-whale-travels-farther-than-any-mammal-ever-recorded/" target="_blank" rel="noreferrer noopener">migrations</a> reaching up to 5,000 kilometers to the tropical regions where they mate and give birth.&nbsp;



During pregnancy, which lasts about 10 months, these females must travel and fast, relying solely on the energy reserves built up in feeding grounds.&nbsp;



By examining a combination of recent and historical data, the researchers found a direct correlation between maternal size and fetal growth: larger mothers carry larger fetuses that grow at faster rates.



<h2 class="wp-block-heading" id="h-energy-demands-of-pregnant-whales">Energy demands of pregnant whales</h2>



These findings allowed the team to estimate the energy demands for different stages of pregnancy. The first two-thirds of the pregnancy required only minimal extra energy, accounting for just 0.01–1.08% of the mother’s energy expenditure.&nbsp;



The most significant strain came in the final 100 days, when energy needs soared to 98.2% of the pregnancy’s total metabolic cost.



“It was surprising to see how the peak of energy requirements coincided with the onset of fasting in pregnant females, ultimately highlighting how crucial those final 100 days of pregnancy are for this migratory species,” said lead author Martin van Aswegen, a PhD student at MMRP.



“Females that are late in the pregnancy are therefore particularly vulnerable to disruptions in energy balance, given periods of greatest energetic stress coincide with fasting and migration to sub-tropical breeding grounds.”&nbsp;



<h2 class="wp-block-heading" id="h-vulnerable-period-for-pregnant-whales">Vulnerable period for pregnant whales</h2>



According to van Aswegen, the study highlights a particularly vulnerable period for pregnant humpback whales.&nbsp;



“This is important, because once these whales leave their high-latitude feeding grounds, they have a finite amount of energy available to invest in their offspring over a 3–5 month fasting period, with energy requirements being even higher after calf birth.”



Humpback whales depend on abundant feeding during summer months in high-latitude regions to gather the energy reserves necessary for migration and <a href="https://www.earth.com/news/humpback-whale-reproduction-is-linked-to-krill-abundance/" target="_blank" rel="noreferrer noopener">reproduction</a>.&nbsp;



The new data highlights how critical it is for these whales to have access to sufficient prey before beginning their long journeys southward to deliver calves in warmer, predator-scarce waters.



<h2 class="wp-block-heading" id="h-declining-calf-production-raises-concerns">Declining calf production raises concerns</h2>



Recent observations have shown a worrying trend: there has been a 75.6% decline in the number of humpback whale mothers with calves off Hawaiʻi between 2013 and 2018.&nbsp;



In Southeast Alaska, a recent study documented that calf production between 2015 and 2019 was about six times lower than in pre-2015 years, while midsummer calf mortality increased tenfold from 2014 to 2019.&nbsp;



These declines coincided with significant, extended changes in the marine food web, leading to poor feeding conditions for humpback whales.



<h2 class="wp-block-heading" id="h-complex-lives-of-humpback-whales">Complex lives of humpback whales</h2>



“This research underpins future studies on humpback whale energy demands,” said Lars Bejder, co-author of the study and director of MMRP.&nbsp;



“Our drone-collected whale health database, developed in partnership with the <a href="https://www.alaskawhalefoundation.org/" target="_blank" rel="noreferrer noopener">Alaska Whale Foundation</a>, includes over 11,000 measurements from 8,500 individual North Pacific whales. Its extensive temporal and spatial scale offers invaluable insights into the effects of large-scale climatic events on this iconic sentinel species.”&nbsp;



Bejder noted that sustaining such long-term, wide-scale studies is crucial for understanding these impacts within the context of natural variability in whale health.”



“This research underscores the value of collaboration in tackling complex questions about the lives of humpback whales,” added Jens Currie, co-author and chief scientist at <a href="https://www.pacificwhale.org/" target="_blank" rel="noreferrer noopener">Pacific Whale Foundation</a>.&nbsp;



“Through large-scale collaborations, we're able to gain critical insights into the challenges migratory whales face during pregnancy to better inform conservation strategies. Together, we can address large-scale ecological challenges that no single institution could achieve alone.”



<h2 class="wp-block-heading" id="h-the-pressure-faced-by-pregnant-whales">The pressure faced by pregnant whales</h2>



By analyzing the whales’ energy use and nutritional demands, this study sheds light on key factors influencing whale reproductive success.&nbsp;



Understanding the energetic pressures faced by pregnant females can guide future <a href="https://www.earth.com/news/effective-conservation-efforts-key-to-saving-biodiversity/" target="_blank" rel="noreferrer noopener">conservation</a> efforts aimed at safeguarding feeding grounds and migration routes.&nbsp;



In a warming ocean where prey availability and distribution are changing, such science-based insights will prove essential for ensuring that humpback whales continue to complete their life cycle and thrive for generations to come.



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The hidden struggles of pregnant humpback whales

Proper food intake is essential for pregnant humpback whales to...

Dog owners often have strong opinions about what to feed their pets. From kibble to raw food, the options are diverse. But what actually influences these choices?



A new study from the Dog Aging Project (DAP) uncovers surprising trends, showing that an owner's age plays a bigger role than their income or education.



<h2 class="wp-block-heading" id="h-studying-how-aging-impacts-dogs">Studying how aging impacts dogs </h2>



The <a href="https://dogagingproject.org" target="_blank" rel="noreferrer noopener">Dog Aging Project</a>, a unique research effort at <a href="https://www.tamu.edu" target="_blank" rel="noreferrer noopener">Texas A&amp;M University</a>, focuses on understanding how aging impacts dogs. 



With over 50,000 dogs enrolled across the U.S., it’s a community-driven initiative that aims to promote healthier and longer lives for <a href="https://www.earth.com/news/dogs-healthcare-needs-change-as-they-enter-old-age/" target="_blank" rel="noreferrer noopener">our furry friends</a>. Not only does the research help dogs, but it also provides insights into human health and aging.



In their latest study, published in the&nbsp;Journal of the American Veterinary Medical Association, the researchers gathered data from more than 40,000 dog owners.



The team analyzed how factors like owner age, income, education, and living environment influence dietary decisions for dogs.



<h2 class="wp-block-heading" id="h-dog-owners-and-pet-food">Dog owners and pet food </h2>



The study revealed that who you are as an owner plays a huge role in what you feed your <a href="https://www.earth.com/news/chernobyl-dogs-are-rapidly-evolving-in-strange-ways-due-to-nuclear-radiation-exposure/" target="_blank" rel="noreferrer noopener">dog</a>.



“We found that owner demographics play a much more important role in the selection of dog diets than previously thought,” explained Dr. Katie Tolbert, a veterinary nutritionist and associate professor at Texas A&amp;M.



For instance, older dog owners are more likely to opt for canned or home-cooked diets. At first glance, you might think this has to do with the dog’s age. But Dr. Tolbert pointed out that it’s more about the owner’s age and their beliefs about what’s healthiest.



“Without considering the owner, we might assume that this choice is a result of dog age,” said Dr. Tolbert.



“But now we have data suggesting that it might be that older dogs are more likely to have older owners, and they are making decisions based on what they believe are healthier choices for their dog that have nothing to do with the dog’s age.”



<h2 class="wp-block-heading" id="h-impact-of-dog-owner-s-lifestyle">Impact of dog owner's lifestyle</h2>



The study also uncovered how a dog’s lifestyle and location influence diet choices. Active and working dogs in rural areas are often fed home-prepared raw or cooked diets, while urban and less active dogs are more likely to eat canned or commercial raw food.



“Although the majority of dogs are fed a kibble diet, regardless of <a href="https://www.earth.com/news/dogs-can-use-soundboards-to-express-their-needs/" target="_blank" rel="noreferrer noopener">dog</a> size or geographic location, we found that highly active dogs, working dogs, and those living in rural environments were more likely to be fed home-prepared raw or cooked diets when fed something other than kibble,” noted Dr. Tolbert.



“In contrast, sedentary dogs and dogs living in urban areas were more likely to be fed canned, commercial raw, or home-cooked diets when fed something other than kibble.”



The findings emphasize the importance of considering both the dog’s traits and the owner’s lifestyle when analyzing dietary decisions.



“The point of this study was to show that we need to consider information about both the dog and their owner when assessing why a dog is fed a particular diet,” said Dr. Tolbert. “This will make sure that we continue to support canine health with the most accurate information possible.”



<h2 class="wp-block-heading" id="h-how-dog-owners-choose-pet-food">How dog owners choose pet food</h2>



This research provides valuable insights for veterinarians and <a href="https://www.earth.com/news/dogs-can-feel-our-emotions-through-our-heart-rate/" target="_blank" rel="noreferrer noopener">pet</a> food companies to better understand how owners decide what to feed their dogs. 



By looking at both the dog and the owner, experts can offer more tailored recommendations to keep dogs healthy and happy.



The Dog Aging Project continues to welcome new participants from across the United States. They’re inviting dogs of all breeds, ages, and health conditions to join this remarkable effort.



By studying canine aging, they hope to improve the lives of dogs and their humans alike.



<h2 class="wp-block-heading" id="h-relationships-of-dogs-and-their-owners">Relationships of dogs and their owners</h2>



The bond between dogs and their owners goes far beyond food choices. <a href="https://www.earth.com/news/this-simple-technique-instantly-reduces-heat-stress-in-dogs/" target="_blank" rel="noreferrer noopener">Dogs</a> often mirror their owners’ lifestyles and emotional states, creating a unique dynamic that impacts both parties. 



Studies have shown that dogs can sense human emotions, respond to stress, and even adopt similar activity levels to their owners. This close relationship makes it imperative to understand both a dog’s needs and also how the owner’s habits and beliefs shape their pet’s overall well-being.



For example, owners who value fitness may encourage their dogs to stay active, leading to healthier lifestyles for both. On the other hand, sedentary owners might unintentionally promote less activity in their pets. 



This interplay highlights how deeply interconnected the lives of <a href="https://www.earth.com/news/friends-family-members-and-guardians-dogs-are-more-than-just-pets/" target="_blank" rel="noreferrer noopener">dogs</a> and owners are, and emphasizes the need for holistic approaches to pet care that consider the human-canine bond.



The study is published in the&nbsp;<a href="https://avmajournals.avma.org/view/journals/javma/262/12/javma.24.05.0358.xml" target="_blank" rel="noreferrer noopener">Journal of the American Veterinary Medical Association</a>. 



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Dog owners' ages and beliefs influence their pet food choices

Dog owners often have strong opinions about what to feed...

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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

[sendtonews key="0ynNMYkMKa-2340414-12187" 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.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



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



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



Video/ Image Credit: American Chemical Society&nbsp;



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



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Flu viruses are more flexible than expected

[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



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Detecting mercury contamination with the tap of a finger

[sendtonews key="LvS8v8bp9z-2564889-12187" 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 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...

On October 22, 2015, NASA’s Terra satellite passed over Chile, allowing the Moderate Resolution Imaging Spectroradiometer (<a href="https://en.wikipedia.org/wiki/Moderate_Resolution_Imaging_Spectroradiometer">MODIS</a>) flying on board to capture a striking true-color image of the region.
Near the center of the image, sitting in a tan desert basin and bordered by mountains, sits one of Chile’s most notable features – the large salt flats of Chile known as the Salar de Atacama. The Salar (a Spanish word meaning “salt flat” lies in the southern half of the Atacama Desert. Receiving less than 1 mm (0.04 inch) of rain annually, it is considered to be one of the driest places on <a href="https://www.earth.com/news/humans-earths-magnetic-fields/">Earth</a>.
The Salar de Atacama appears white from space due to its high reflectivity. When viewed in person, however, the surface appears generally flat, desiccated, and rough. The color ranges from a dull white to grey-brown. Although it appears dry, mineral-rich brines (water with a high percentage of dissolved salts) lie just below the surface. Where the liquid brine breaks through to the surface, flocks of bright pink flamingos often can be seen foraging for food.
The Salar de Atacama is the third largest salt flat in the world. It covers approximately 1,200 sq. mi (3,000 sq. km), and is about 62 mi (100 km) long and 50 mi (80 km) wide. Lying close to the large mountain town of San Pedro de Atacama, the salt flats are a popular destination for tourists with various interests, including photography, hiking, and bird watching. Thanks to very dark skies with low light pollution, sky watching is excellent in this area.
Perhaps the greatest claim to fame for the Salar de Atacama, however, is the rich lithium deposits found in the brine. It is estimated the waters contain more than one-quarter of the world’s lithium reserve base. Due to the high lithium concentration in the brine, along with other factors, it is relatively inexpensive to extract and lithium production is an important industry in this region.

Salar de Atacama - The Salt Flats Of Chile

Hole Punch Clouds Over the Southeast. In elementary school, students learn that water freezes at 0 degrees Celsius (32 degrees Fahrenheit). That is true most of the time, but there are exceptions to the rule. For instance, water with very few impurities (such as dust or pollution particles, fungal spores, and bacteria) can be chilled to much cooler temperatures and still remain liquid—a process known as <a href="http://www.sciencedaily.com/articles/s/supercooling.htm">supercooling.</a>

Supercooling may sound exotic, but it occurs pretty routinely in Earth’s atmosphere. <a href="http://www.weatheronline.co.uk/reports/wxfacts/Altocumulus.htm">Altocumulus clouds,</a> a common type of mid-altitude cloud, are mostly composed of water droplets supercooled to a temperature of about -15 degrees C. Altocumulus clouds with supercooled tops cover about 8 percent of Earth’s surface at any given time.

Supercooled water droplets play a key role in the formation of <a href="http://earthobservatory.nasa.gov/IOTD/view.php?id=7362">hole-punch</a> and canal clouds, the distinctive clouds shown in this satellite image. Hole-punch clouds, which are also called fallstreak clouds, usually appear as circular gaps in decks of altocumulus clouds; canal clouds look similar but the gaps are longer and thinner. The natural-color image shows hole-punch and canal clouds over Mississippi and Louisiana, as observed on December 29, 2015, by the <a href="http://modis.gsfc.nasa.gov/about/">Moderate Resolution Imaging Spectroradiometer</a> (MODIS) on NASA’s Terra satellite.

Both types of cloud form when aircraft fly through cloud decks rich with supercooled water droplets and produce <a href="http://www.boldmethod.com/learn-to-fly/weather/contrails/">aerodynamic contrails.</a> Air expands and cools as it moves around the wings and past the propeller, a process known as <a href="http://apollo.lsc.vsc.edu/classes/met130/notes/chapter6/adiab_cool.html">adiabatic cooling.</a> Air temperatures over jet wings often cool by as much as 20 degrees Celsius, pushing supercooled water droplets to the point of freezing.

As ice crystals form, they absorb nearby water droplets. Ice crystals are relatively heavy, so they tend to sink. This triggers tiny bursts of snow or rain that leave gaps in the cloud cover. Whether a cloud formation becomes a hole-punch or canal depends on the thickness of the cloud layer, the air temperature, and the degree of horizontal <a href="http://glossary.ametsoc.org/wiki/Wind_shear">wind shear.</a> Both descending and ascending aircraft—including jets and propeller planes—can trigger hole-punch and canal clouds.

Read <a href="https://www.washingtonpost.com/news/capital-weather-gang/wp/2015/12/29/photos-striking-fallstreak-clouds-punch-holes-through-southern-skies/">this post</a> from the Capital Weather Gang at The Washington Post to see photographs of hole-punch clouds taken from the ground.

Credit: NASA <a href="http://rapidfire.sci.gsfc.nasa.gov/cgi-bin/imagery/single.cgi?image=Louisiana.A2015363.1615.1km.jpg">image</a> by Jeff Schmaltz, <a href="http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=84873&amp;eocn=home&amp;eoci=nh">LANCE/EOSDIS Rapid Response.</a> Caption by Adam Voiland.

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