Today's Image of the Day from the European Space Agency features a brilliant stellar nursery located about 163,000 light-years away.



According to ESA, the image is one of the most photogenic examples of the many stellar nurseries observed by the NASA/ESA Hubble Space Telescope during its 30-year lifetime. 



“The portrait features the giant nebula NGC 2014 and its neighbor NGC 2020 which together form part of a vast star-forming region in the Large Magellanic Cloud, a satellite galaxy of the Milky Way,” noted <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



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



Stellar nurseries are regions in space where new stars are <a href="https://www.earth.com/news/baby-stars-release-sneezes-of-gas-and-dust-as-they-develop/" target="_blank" rel="noreferrer noopener">born</a> - often within vast clouds of gas and dust called molecular clouds.&nbsp;



These areas are fascinating because they are cradles of stellar evolution, where gravity causes clumps of gas to collapse, eventually forming protostars.&nbsp;



Over time, the protostars will heat up and start the nuclear fusion process that powers a star.



One of the most well-known stellar nurseries is the Orion Nebula, which is visible to the naked eye and located about 1,350 light-years from Earth.&nbsp;



<h2 class="wp-block-heading" id="h-dynamic-nature-of-a-stellar-nursery-nbsp">Dynamic nature of a stellar nursery&nbsp;</h2>



Within these nurseries, the balance between gravity and pressure determines the types of stars that form, from massive, luminous stars to smaller, cooler ones like our Sun.&nbsp;



The environment is incredibly dynamic, with powerful winds from young stars shaping the clouds and triggering the birth of even more stars.



These regions are often illuminated by the light from massive newborn stars - creating stunning, colorful displays. The light reveals the intricate structure of the dust and gas, sculpted by the energy of young stars.&nbsp;



<h2 class="wp-block-heading" id="h-significance-of-stellar-nurseries-nbsp">Significance of stellar nurseries&nbsp;</h2>



Stellar nurseries are essential for understanding the early stages of planetary formation, as protoplanetary disks (the material from which <a href="https://www.earth.com/news/planet-formation-new-insights-mechanics-physics/" target="_blank" rel="noreferrer noopener">planets form</a>) are often found around young stars in these regions.



Stellar nurseries play a crucial role in the ongoing evolution of <a href="https://www.earth.com/news/black-hole-is-starving-its-host-galaxy-of-star-forming-fuel/" target="_blank" rel="noreferrer noopener">galaxies</a>. They are responsible for the continuous birth of new stars that enrich the interstellar medium with heavier elements. This constant recycling of material is key to the development of future generations of stars and planets.&nbsp;



Furthermore, the study of these regions helps astronomers understand the fundamental processes that govern the life cycles of stars and the overall dynamics of the universe.



<h2 class="wp-block-heading" id="h-the-local-group">The Local Group</h2>



The Local Group is a collection of over 80 galaxies that includes the Milky Way, the Andromeda Galaxy, and the Triangulum Galaxy, along with numerous smaller dwarf galaxies. These galaxies are bound together by gravity and span a region roughly 10 million light-years across.&nbsp;



The <a href="https://www.earth.com/news/milky-ways-thin-disk-is-billions-of-years-older-than-we-thought/" target="_blank" rel="noreferrer noopener">Milky Way</a> and Andromeda are the dominant members, with their respective satellite galaxies orbiting them.&nbsp;



The Local Group is part of a larger structure known as the Virgo Supercluster, and its galaxies are moving toward the gravitational center of the Local Group, contributing to its dynamic nature.&nbsp;



<h2 class="wp-block-heading" id="h-large-magellanic-cloud">Large Magellanic Cloud</h2>



The Large Magellanic Cloud (LMC) is the fourth largest galaxy in the Local Group and can be seen with the naked eye from the Southern Hemisphere.&nbsp;



This irregular dwarf galaxy is home to the Tarantula Nebula, one of the most active star-forming regions in our cosmic neighborhood.&nbsp;



The Large Magellanic Cloud played a key role in astronomical history, particularly when the supernova SN 1987A was observed, providing valuable insights into stellar evolution.&nbsp;



The LMC's interaction with the Milky Way, along with its own companion, the Small Magellanic Cloud, is believed to influence its shape and star formation activity. Its proximity and unique properties make it a crucial object of study for understanding <a href="https://www.earth.com/news/massive-galactic-explosion-provides-clues-about-galaxy-evolution/" target="_blank" rel="noreferrer noopener">galaxy evolution</a>, star formation, and the dynamics of interacting galaxies.



Image Credit: NASA, ESA, and STScI



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Hubble captures a stunning stellar nursery

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

Today's Image of the Day from the European Space Agency features the Southern Ring Nebula, also known as NGC 3132.



The nebula is located about 2,000 light-years away from Earth in the constellation Vela. This remarkably detailed image was created using data from Webb’s Near-Infrared Camera (NIRCam).



The Southern Ring Nebula is one of the more famous examples of planetary nebulae. It is often studied for its beauty and valuable insights into the end stages of stellar evolution.



<h2 class="wp-block-heading" id="h-stars-power-the-southern-ring-nebula-nbsp">Stars power the Southern Ring Nebula&nbsp;</h2>



The <a href="https://www.earth.com/news/dragons-egg-nebula-is-a-truly-stunning-sight-to-behold/" target="_blank" rel="noreferrer noopener">nebula</a> is powered by two central stars in a binary system. The brighter star is actually a less massive companion. The fainter, dimmer star is the dying, hot central star that has shed its outer layers to form the nebula. 



The dimmer star is a white dwarf and is responsible for the ionization of the gas in the nebula, causing it to glow.



“The bright star at the center of NGC 3132, while prominent when viewed by NASA’s Webb Telescope in near-infrared light, plays a supporting role in sculpting the surrounding nebula," noted <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



"A second star, barely visible at lower left along one of the bright star’s diffraction spikes, is the nebula’s source. It has ejected at least eight layers of gas and dust over thousands of years.” 



“But the bright central star visible here has helped ‘stir’ the pot, changing the shape of this planetary nebula’s highly intricate rings by creating turbulence." 



ESA explained that the pair of stars are locked in a tight orbit, which leads the dimmer star to spray ejected material in a range of directions as they orbit one another, resulting in these jagged rings.



<h2 class="wp-block-heading" id="h-key-characteristics-of-the-southern-ring-nebula-nbsp">Key characteristics of the Southern Ring Nebula&nbsp;</h2>



The Southern Ring Nebula displays a complex structure with multiple layers of gas and dust. 



The outer shells of the nebula consist of hydrogen and other elements that were ejected from the dying star in previous stages of its <a href="https://www.earth.com/news/young-stellar-objects-observing-the-early-lives-of-stars/" target="_blank" rel="noreferrer noopener">evolution</a>. These layers are illuminated by ultraviolet radiation from the central white dwarf.



<h3 class="wp-block-heading" id="h-coloration">Coloration</h3>



The colors seen in the Southern Ring Nebula come from the different gases present. For example, hydrogen emits red light, while oxygen emits blue-green light. 



These colors help astronomers study the composition and dynamics of the nebula.



<h3 class="wp-block-heading" id="h-size-and-shape">Size and shape</h3>



The nebula spans about half a light-year in diameter. Its intricate, symmetrical structure provides valuable insights into the late stages of <a href="https://www.earth.com/news/star-collapse-black-hole-instead-of-supernova-vanish-from-sky/" target="_blank" rel="noreferrer noopener">stellar evolution</a>, especially the processes involved in the shedding of outer layers by dying stars.



<h2 class="wp-block-heading" id="h-spotlights-from-the-bright-star">Spotlights from the bright star</h2>



ESA noted that hundreds of straight, brightly-lit lines pierce through the rings of gas and dust. “These ‘spotlights’ emanate from the bright star and stream through holes in the nebula like sunlight through gaps in a cloud."



“But not all of the starlight can escape. The density of the central region, set off in teal, is reflected by how transparent or opaque it is. Areas that are a deeper teal indicate that the gas and dust are denser - and light is unable to break free.”



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



According to ESA, this is not only a crisp image of a planetary nebula - it also shows us objects in the vast distances of space behind it. The transparent red sections of the nebula are filled with distant <a href="https://www.earth.com/news/galaxies-have-hearts-and-lungs-that-help-them-live-longer/" target="_blank" rel="noreferrer noopener">galaxies</a>.



“Look for the bright angled line at the upper left. It is not starlight - it is a faraway galaxy seen edge-on. Distant spirals, of many shapes and colors, also dot the scene. Those that are farthest away - or very dusty - are small and red,” said ESA.



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



Vela is a southern constellation that represents the sails of a ship. It was once part of a larger constellation called Argo Navis, which depicted the ship of the mythological hero Jason and the Argonauts. 



In the 18th century, Argo Navis was divided into three separate constellations: Vela (the sails), Carina (the keel), and Puppis (the stern).



Vela is notable for containing several interesting astronomical features. One of its most prominent stars is Gamma Velorum, also known as Suhail or Regor, which is a bright, massive star system consisting of multiple stars.&nbsp;



The constellation also hosts the Vela Supernova Remnant, the remains of a <a href="https://www.earth.com/news/supernova-explosions-could-damage-distant-planets/" target="_blank" rel="noreferrer noopener">supernova</a> explosion that occurred about 11,000 years ago. 



This remnant is associated with the Vela Pulsar, a neutron star that formed during the supernova explosion, which is one of the brightest pulsars in the sky.



Vela is best observed in the Southern Hemisphere, where it can be seen in the summer months. Its position along the Milky Way makes it a popular region for both amateur and professional astronomers to explore.



Image Credit: NASA, ESA, CSA, STScI



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Southern Ring Nebula in the constellation Vela 

Today's Image of the Day from the European Space Agency features NGC 6744 - a large, barred spiral galaxy located approximately 30 million light-years away in the constellation Pavo.&nbsp;



The galaxy is often considered a close analog to the <a href="https://www.earth.com/news/uma3-u1-faintest-star-system-found-orbiting-milky-way-galaxy/" target="_blank" rel="noreferrer noopener">Milky Way</a> due to its similar structure and size, spanning about 175,000 light-years across.&nbsp;



<h2 class="wp-block-heading" id="h-euclid-space-mission-nbsp">Euclid space mission&nbsp;</h2>



The image was captured by the <a href="https://www.esa.int/Science_Exploration/Space_Science/Euclid" target="_blank" rel="noreferrer noopener">Euclid</a> space telescope. NGC 6744 stands out as a prime example of the galaxies currently forming the majority of stars in the nearby universe, making it an ideal subject for study with the Euclid mission.&nbsp;



Euclid’s extensive field-of-view allows it to capture the entire galaxy, showcasing not only its large-scale spiral structure but also revealing intricate details on smaller scales across various wavelengths. These details include feather-like dust lanes, known as “spurs,” emerging from the spiral arms.



<h2 class="wp-block-heading" id="h-star-formation-in-ngc-6744">Star formation in NGC 6744</h2>



Euclid's observations enable scientists to count individual stars within NGC 6744, trace the distribution of stars and dust throughout the galaxy, and map the dust associated with the gas that fuels the development of new stars. 



<a href="https://www.earth.com/news/baby-stars-release-sneezes-of-gas-and-dust-as-they-develop/" target="_blank" rel="noreferrer noopener">Star formation</a> is a key process in the growth of galaxies, making these studies crucial for understanding galaxy evolution.



Researchers are utilizing Euclid’s data to explore the relationship between dust, gas, and star formation; to map the distribution of different stellar populations and identify regions of active star formation; and to investigate the underlying physics of spiral galaxy structures.&nbsp;



Spiral arms play a significant role in star formation by compressing gas, yet the precise mechanisms behind this process are still unclear. The presence of “spurs” along NGC 6744’s spiral arms offers valuable insights into the dynamics of star formation within these structures.



<h2 class="wp-block-heading" id="h-discovering-new-dwarf-galaxies-nbsp">Discovering new dwarf galaxies&nbsp;</h2>



Additionally, Euclid's dataset will help scientists identify clusters of old stars (globular clusters) and discover new dwarf galaxies around NGC 6744. Remarkably, Euclid has already identified a new dwarf satellite galaxy of NGC 6744 - a surprising discovery given that the galaxy has been studied extensively.



With Euclid’s detailed observations, scientists are gaining a deeper understanding of the processes shaping galaxies, providing essential clues to the evolution and appearance of the <a href="https://www.earth.com/news/universes-expansion-rate-hubble-tension-puzzles-astronomers/" target="_blank" rel="noreferrer noopener">universe</a>.



<h2 class="wp-block-heading" id="h-more-about-ngc-6744">More about NGC 6744</h2>



NGC 6744's disk is rich in star-forming regions and contains numerous young, bright blue stars. The galaxy's nucleus is slightly elongated and has a bar structure, which influences the motion of the stars and gas within it.&nbsp;



The spiral arms of NGC 6744 are well-defined and extend outward, wrapping around the central bar. Additionally, NGC 6744 has a smaller companion galaxy, NGC 6744A, which is interacting with it, adding to the complexity and interest of this distant system.&nbsp;



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



<a href="https://www.earth.com/news/the-mesmerizing-beauty-of-spiral-galaxies/" target="_blank" rel="noreferrer noopener">Spiral galaxies</a> are one of the most common types of galaxies in the universe, characterized by their distinct, spiral-shaped structure.&nbsp;



The galaxies typically consist of a flat, rotating disk containing stars, gas, and dust, along with a central concentration of stars known as the bulge. This bulge is often surrounded by a halo of older stars.&nbsp;



The spiral arms, which extend from the central bulge, are regions of active star formation and are rich in young, hot stars, giving them a bright, bluish appearance.&nbsp;



These arms are also sites where interstellar gas and dust are concentrated, leading to the formation of new stars.&nbsp;



Spiral galaxies are classified into different types based on the tightness of their spirals and the size of their central bulge, with classifications ranging from tightly wound arms in Sa galaxies to more loosely wound arms in Sc galaxies. The <a href="https://www.earth.com/news/large-amount-of-dark-matter-may-be-missing-from-the-milky-way/" target="_blank" rel="noreferrer noopener">Milky Way</a>, our home galaxy, is a prime example of a spiral galaxy.



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



Pavo, which means "peacock" in Latin, is a constellation in the southern sky. It was named by the Dutch astronomer Petrus Plancius in the late 16th century, based on observations made during the Dutch explorations of the southern hemisphere. 



Pavo is one of the 12 constellations created by Plancius from the records of explorers Pieter Dirkszoon Keyser and Frederick de Houtman. 



The constellation is known for its distinctive shape, resembling a peacock with a long, curved tail. Pavo is not visible from most of the northern hemisphere, but it can be seen from the southern hemisphere, particularly during the winter months.



The constellation contains several interesting celestial objects, including the star Peacock, also known as Alpha Pavonis, which is the brightest star in the constellation. This star is a blue-white subgiant located about 179 light-years from Earth.



Image Credit: <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>/Euclid/Euclid Consortium/NASA&nbsp;



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Spiral galaxy NGC 6744 in the constellation Pavo

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>. 



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. 



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. 



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>. 



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  

Today's Image of the Day from the European Space Agency features the galaxy I Zwicky 18, which was captured in remarkable detail by the James Webb Space Telescope.



I Zwicky 18 is a blue compact dwarf <a href="https://www.earth.com/news/newly-discovered-stars-milky-way-are-old-as-universe/" target="_blank" rel="noreferrer noopener">galaxy</a> located approximately 59 million light-years away in the constellation Ursa Major.&nbsp;



<h2 class="wp-block-heading" id="h-star-formation-in-i-zwicky-18">Star formation in I Zwicky 18</h2>



The galaxy is notable for its relatively young appearance and the fact that it contains very few heavy elements. These characteristics indicate that it has experienced little <a href="https://www.earth.com/news/baby-stars-release-sneezes-of-gas-and-dust-as-they-develop/" target="_blank" rel="noreferrer noopener">star formation</a> compared to other galaxies of similar age.



“The galaxy was first identified by Swiss astronomer Fritz Zwicky in the 1930’s and resides roughly 59 million light-years from Earth,” noted <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>. “This galaxy has gone through several sudden bursts of star formation.”&nbsp;



According to ESA, I Zwicky 18 is typical of the kinds of galaxies that inhabited the early universe and is much smaller than our <a href="https://www.earth.com/news/runaway-star-j1249-36-spotted-trying-to-escape-our-milky-way-galaxy/" target="_blank" rel="noreferrer noopener">Milky Way</a>.



<h2 class="wp-block-heading" id="h-webb-telescope-image-of-the-galaxy">Webb telescope image of the galaxy</h2>



“Two major starburst regions are embedded in the heart of the galaxy. The wispy brown filaments surrounding the central starburst region are bubbles of gas that have been heated by stellar winds and intense ultraviolet radiation unleashed by hot, young stars,” noted ESA.



“A companion galaxy resides nearby to the dwarf galaxy, which can be seen at the bottom of the wider-field image. The companion may be interacting with the dwarf galaxy and may have triggered that galaxy's recent star formation.”&nbsp;



ESA explained that the “orange blobs” surrounding the galaxy are the dim glow from ancient fully formed galaxies at much larger distances.



<h2 class="wp-block-heading" id="h-key-characteristics-of-i-zwicky-18">Key characteristics of I Zwicky 18</h2>



As previously mentioned, the galaxy has a very low abundance of elements heavier than hydrogen and helium, suggesting that it has not undergone significant stellar processing.



<h3 class="wp-block-heading" id="h-young-stellar-population-nbsp">Young stellar population&nbsp;</h3>



Despite its old age, I Zwicky 18 contains many young, hot stars. This suggests that it might have experienced a burst of <a href="https://www.earth.com/news/hubble-detects-awe-inspiring-newborn-star/" target="_blank" rel="noreferrer noopener">star formation</a> relatively recently in its history.



<h3 class="wp-block-heading" id="h-interstellar-medium-nbsp">Interstellar medium&nbsp;</h3>



The galaxy has a high density of gas, which is a prime ingredient for star formation. This gas is mostly in the form of hydrogen.



<h3 class="wp-block-heading" id="h-unusual-characteristics">Unusual characteristics</h3>



Its characteristics are more typical of primordial galaxies found in the early universe, making it a valuable object of study for understanding galaxy formation and evolution.



Ultimately, I Zwicky 18 provides insights into the conditions and processes that might have been prevalent in the early universe.



<h3 class="wp-block-heading" id="h-life-cycles-of-stars-and-dust">Life cycles of stars and dust</h3>



The image was captured as part of a Webb program to study the life cycle of dust in I Zw 18.&nbsp;



“Scientists are now building off of previous research with Hubble obtained at optical wavelengths, studying individual dusty stars in detail with Webb’s equivalent spatial resolution and sensitivity at infrared wavelengths.”&nbsp;



ESA noted that this galaxy is of particular interest as its content of elements heavier than helium is one of the lowest of all known <a href="https://www.earth.com/news/early-galaxy-formation-occurred-much-faster-than-we-thought/" target="_blank" rel="noreferrer noopener">galaxies</a> in the local universe.&nbsp;



“Such conditions are thought to be similar to those in some of the first star-forming galaxies at high redshift, so the Webb study of I Zw 18 should shed light on the life-cycle of stars and dust in the early universe.”



<h2 class="wp-block-heading" id="h-the-constellation-ursa-major">The constellation Ursa Major </h2>



Ursa Major, also known as the Great Bear, is one of the most prominent and easily recognizable constellations in the northern sky. 



Its name, "Ursa Major," means "Great Bear" in Latin, and it has been a significant part of various mythologies and star lore across cultures for thousands of years. 



One of the most famous asterisms within Ursa Major is the Big Dipper, a group of seven bright stars that form a shape resembling a ladle or dipper. The Big Dipper is often used as a navigation tool because it points to Polaris, the North Star, located in the nearby constellation Ursa Minor.



Ursa Major is best viewed in the northern hemisphere and is circumpolar, meaning it is visible year-round for much of the Northern Hemisphere. Its position changes with the seasons, rotating around Polaris, the North Star.



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



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Dwarf galaxy provides a window into the early universe

Today's Image of the Day from the European Space Agency features NGC 1333, a reflection nebula located in the Perseus molecular cloud about 960 light-years away from Earth. The photo is a mosaic of images captured by the James Webb Space Telescope.



<h2 class="wp-block-heading" id="h-the-power-of-webb-nbsp-nbsp">The power of Webb&nbsp;&nbsp;</h2>



“Webb’s superb sensitivity allows astronomers to investigate young objects with extremely low masses. Some of the faintest ‘stars’ in the picture are in fact newly born free-floating brown dwarfs with masses comparable to those of giant planets,” noted <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



The same cluster was featured as the 33rd anniversary image of the Hubble Space Telescope in April 2023.&nbsp;



According to ESA, Hubble’s image just scratched the surface of this region, because clouds of dust obscure much of the star formation process. 



"Observing with larger aperture and in the infrared part of the spectrum, Webb is capable of peering through the dusty veil to reveal newborn stars, brown dwarfs and planetary mass objects."



<h2 class="wp-block-heading" id="h-webb-s-view-of-ngc1333">Webb’s view of NGC1333</h2>



ESA noted that the center of the image presents a deep peek into the heart of the NGC1333 cloud.&nbsp;



“Across the image we see large patches of orange, which represent gas glowing in the infrared. These so-called Herbig-Haro objects form when ionized material ejected from young stars collides with the surrounding cloud. They are hallmarks of a very active site of star formation."



The disks of gas and dust that surround the <a href="https://www.earth.com/news/newly-discovered-stars-milky-way-are-old-as-universe/" target="_blank" rel="noreferrer noopener">stars</a> in this image may eventually produce planetary systems.&nbsp;



<h2 class="wp-block-heading" id="h-formation-of-the-sun">Formation of the Sun</h2>



“Similar to the young stars in this mosaic, our own Sun and planets formed inside a dusty molecular cloud, 4.6 billion years ago. Our Sun did not form in isolation but as part of a cluster, which was perhaps even more massive than NGC 1333,” explained ESA.



Over time, the stars in the Sun's birth cluster would have drifted apart due to gravitational interactions and the dispersion of gas in the region.



Astronomers have been studying certain clues, such as isotopic signatures in meteorites, that hint the Sun may have formed near massive stars. These stars likely produced supernovae, which could have influenced the early <a href="https://www.earth.com/news/mysterious-objects-spotted-in-the-outer-solar-system-beyond-pluto/" target="_blank" rel="noreferrer noopener">solar system</a> by injecting heavy elements like iron-60.



<h2 class="wp-block-heading" id="h-star-formation-in-ngc-1333">Star formation in NGC 1333</h2>



NGC 1333 is a vibrant example of a stellar nursery, where active <a href="https://www.earth.com/news/baby-stars-release-sneezes-of-gas-and-dust-as-they-develop/" target="_blank" rel="noreferrer noopener">star formation</a> is ongoing. It is known for its chaotic appearance, shaped by the interactions between newborn stars and the surrounding material.



Within NGC 1333, astronomers have observed a high level of turbulence, which makes the region dynamic and complex. 



These disturbances are caused by the outflows of young stars as they eject material into their surroundings, creating shock waves and influencing further star formation.&nbsp;



These outflows are often seen as jets, which are visible in multiple wavelengths of light, especially infrared, as the surrounding dust absorbs visible light.



<h2 class="wp-block-heading" id="h-significance-of-ngc-1333">Significance of NGC 1333</h2>



NGC 1333 is also an area of interest for studying the early stages of star and <a href="https://www.earth.com/news/planet-formation-new-insights-mechanics-physics/" target="_blank" rel="noreferrer noopener">planet formation</a>, as many of the stars within the cluster are in their infancy, still in the process of gathering material and developing protoplanetary disks.&nbsp;



In images, NGC 1333 is marked by bright patches of blue and red, representing reflection <a href="https://www.earth.com/news/six-rogue-worlds-discovered-inside-a-young-star-forming-nebula/" target="_blank" rel="noreferrer noopener">nebulae</a> and the ionized gas created by energetic young stars.&nbsp;



<h2 class="wp-block-heading" id="h-the-perseus-molecular-cloud-nbsp">The Perseus molecular cloud&nbsp;</h2>



The Perseus molecular cloud is a vast region of cold gas and dust located about 600 light-years away from Earth in the constellation <a href="https://www.earth.com/news/1500-billion-orphan-stars-discovered-in-the-perseus-galaxy-cluster/" target="_blank" rel="noreferrer noopener">Perseus</a>.&nbsp;



It is one of the most studied star-forming regions in our galaxy due to its relative proximity and the diversity of its young stellar objects. This cloud spans several hundred light-years and contains dense pockets of gas where new stars are actively forming.&nbsp;



These areas are often enshrouded in thick dust, which obscures them in visible light but allows astronomers to study them using infrared and radio wavelengths.



The Perseus molecular cloud is particularly interesting because of the chemistry taking place within it, including the formation of complex organic molecules that could be precursors to life.&nbsp;



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



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Stellar nursery shines in the Perseus cloud

San Francisco, California at Night Today’s Image of the Day comes thanks to the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> and features a look at the SF California area at night.

In the left of the photo is the city of SF itself, with <a href="https://www.earth.com/news/san-diego-greenest-cities/">San Jose</a> lighting up the sky just to the south.

The two light spots to the east are the cities of Stockton and Modesto. The darker areas on the far right side of the image are the <a href="https://www.earth.com/image/sierra-nevada-snowpack-intact/">Sierra Nevada mountains</a>. Therefore this city , officially the City and County of San Francisco, is a cultural, commercial, and financial center of Northern California. SF is the 16th most populous city in the United States, and the fourth most populous in California, with 881,549 residents as of 2019. It covers an area of about 46.89 square miles, mostly at the north end of the San Francisco Peninsula in the SF Bay Area, making it the second most densely populated large U.S. city, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. San Francisco is part of the 12th-largest metropolitan 

This image was captured by an astronaut on board the International Space Station. 

--

By <a href="mailto:rarnold@earth.com">Rory Arnold</a>, <a href="http://earth.com/staff">Earth.com</a> Staff Writer

Source: <a href="https://earthobservatory.nasa.gov/IOTD/view.php?id=82198">NASA Earth Observatory</a>
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San Francisco, California at Night

Have you ever looked back and felt like the years just vanished overnight? You're not the only one. Many of us notice that as we age, our perception of time changes. 



Days and years seem to speed by, leaving us wondering what changed. Is it just our busy lives, or is there something deeper happening in our brains?



Scientists are diving into this age-old mystery to uncover why time feels like it's racing against us. 



<h2 class="wp-block-heading" id="h-human-perception-of-time">Human perception of time</h2>



From changes in how our <a href="https://www.earth.com/news/nature-experiences-alter-time-perception/" target="_blank" rel="noreferrer noopener">minds process information</a> to the routines that shape our daily lives, there's a lot going on behind the scenes.



Adrian Bejan, a researcher at <a href="https://www.duke.edu" target="_blank" rel="noreferrer noopener">Duke University</a> with decades of experience, offers a fascinating perspective on this phenomenon. 



He suggests that our perception of time changes due to physical alterations in our brains and bodies as we age.



But let's unpack this idea step by step. Why do some days feel longer or shorter than others? And why does time seem to fly by as we get older?



<h2 class="wp-block-heading" id="h-clock-time-vs-mind-time">"Clock time" vs. "mind time"</h2>



According to Bejan, there's a distinction between measurable clock time and the time <a href="https://www.earth.com/news/slow-motion-exercise-changes-our-perception-of-time/" target="_blank" rel="noreferrer noopener">perceived by our minds</a>. 



He explains, "The measurable ‘clock time’ is not the same as the time perceived by the human mind. The ‘mind time’ is a sequence of images, i.e., reflections of nature that are fed by stimuli from sensory organs."



In simpler terms, our brains process a series of mental images based on what we see, hear, and experience. 



When we're young, our brains receive and process these images more rapidly. As we age, this processing slows down due to <a href="https://www.earth.com/news/heart-rate-influences-our-perception-of-time/" target="_blank" rel="noreferrer noopener">physical changes</a> like the degradation of neural pathways.



<h2 class="wp-block-heading" id="h-why-some-days-feel-longer">Why some days feel longer</h2>



Have you noticed that days filled with new experiences or productivity seem longer? That's because your mind is processing more information and creating more mental images. 



When you're well-rested, your <a href="https://www.earth.com/news/our-brains-bend-time-to-adapt-to-lifes-rhythm/" target="_blank" rel="noreferrer noopener">brain operates</a> more efficiently, allowing you to take in more of the world around you.



Think about athletes who perform best when they're rested. "Lack of rest makes you miss plays, unable to anticipate, unable to see the ball before it arrives," Bejan notes. 



The same goes for students taking exams; a well-rested mind can work through problems more thoroughly, making the exam period feel longer.



<h2 class="wp-block-heading" id="h-perception-of-time-based-on-routine">Perception of time based on routine</h2>



Cindy Lustig, a psychology professor at the <a href="https://umich.edu/" target="_blank" rel="noreferrer noopener">University of Michigan</a>, offers another angle. She points out that as we age, our lives often become more routine. 



"When we are older, we tend to have lives that are more structured around routines, and fewer of the big landmark events that we use to demarcate different epochs of the ‘time of our lives,’" says Lustig.



With fewer new experiences, our brains lump similar days and weeks together. This can make time feel like it's passing more quickly because there are <a href="https://www.earth.com/news/children-and-adults-perceive-time-differently/" target="_blank" rel="noreferrer noopener">fewer memorable events</a> to distinguish one period from another.



<h2 class="wp-block-heading" id="h-social-media-s-impact-on-time-perception">Social media's impact on time perception</h2>



In today's digital age, excessive use of social media can also distort our <a href="https://www.earth.com/news/astrophysicist-says-hes-cracked-the-equation-for-time-travel/" target="_blank" rel="noreferrer noopener">sense of time</a>. When we dive into our favorite apps, we're met with an endless stream of posts, videos, and updates that continuously stimulate our senses. 



This constant engagement can make minutes turn into hours without us noticing. The design of these platforms often encourages prolonged usage through features like infinite scrolling and autoplay videos, which can trap us in a loop where we lose track of how much time has actually passed.



Moreover, excessive use of social media can lead to sleep deprivation, especially when we stay up late scrolling through our feeds. 



Lack of adequate sleep affects our <a href="https://www.earth.com/news/time-cells-in-the-brain-are-key-to-complex-learning/" target="_blank" rel="noreferrer noopener">cognitive functions</a>, making it harder for us to process information efficiently. This can further alter our perception of time, making days feel shorter and less memorable.



<h2 class="wp-block-heading" id="h-physical-changes-in-the-aging-brain">Physical changes in the aging brain</h2>



Bejan emphasizes that physical changes in our brains contribute significantly to this <a href="https://www.earth.com/news/meditation-reveals-common-altered-states-of-consciousness/" target="_blank" rel="noreferrer noopener">altered perception</a>. 



"The rate at which changes in mental images are perceived decreases with age because of several physical features that change with age: saccades frequency, body size, pathways degradation, etc.," he explains.



As our neural pathways degrade over time, our brains take longer to process new information. 



This slower processing speed means we're generating fewer mental images in the same amount of clock time, making time seem to pass faster.



<h2 class="wp-block-heading" id="h-friendly-debate-among-experts">Friendly debate among experts</h2>



While Bejan's theory is compelling, Lustig isn't entirely convinced it tells the whole story. 



She challenges some of his points, especially regarding physical changes like head size affecting perception. 



"He makes some argument about the length of the optic nerve related to head size, and I will let you judge whether an 80-year-old has a substantially larger head than a 25-year-old," Lustig remarks.



<h2 class="wp-block-heading" id="h-what-s-really-going-on-with-time">What's really going on with time?</h2>



The truth might be a blend of both perspectives. Our perception of time likely changes due to a combination of physical changes in our brains and the way we experience life as we age. 



With fewer novel experiences and a slower processing speed, time seems to accelerate.



But here's something to ponder: Can we slow down our perception of time by actively seeking new experiences and staying mentally engaged? It's worth considering.



Perhaps the <a href="https://www.earth.com/news/mindfulness-can-lead-to-altered-states-of-consciousness/" target="_blank" rel="noreferrer noopener">key lies in mindfulness</a> and breaking out of routines. By introducing variety into our lives and challenging our minds, we might recapture that youthful sense of time stretching out before us.



Have you tried picking up a new hobby or exploring a new place recently? How did it affect your perception of time?



<h2 class="wp-block-heading" id="h-time-perception-and-the-human-experience">Time, perception, and the human experience</h2>



To sum it all up, our sense that time speeds up as we age seems to stem from both physical changes in our brains and the routines we fall into over the years.



As we get older, our brains process new information more slowly due to the degradation of neural pathways.



This slower processing means we perceive fewer <a href="https://www.earth.com/news/how-do-dreams-influence-our-perceptions/" target="_blank" rel="noreferrer noopener">mental images</a> in the same amount of clock time, making days and years feel like they pass more quickly.



Meanwhile, as we get older, we tend to have more structured lives filled with routines and fewer novel experiences. 



This lack of new events makes it harder for our brains to distinguish one day from the next, contributing to the sensation that time is slipping away.



While scientists like Bejan and Lustig continue to explore this intriguing topic, one thing is clear: our perception of time is deeply personal and influenced by many factors.



By actively seeking new experiences and staying mentally engaged, we might just slow down our perception of time and make each moment count a little more.



The full study was published in the journal <a href="https://www.cambridge.org/core/journals/european-review/article/why-the-days-seem-shorter-as-we-get-older/2CB8EC9B0B30537230C7442B826E42F1" target="_blank" rel="noreferrer noopener">European Review</a>.



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Time flies by much faster as we get older, and now we know why

Have you ever looked back and felt like the years...

Turtles are fascinating reptiles known for their distinctive shells, which serve as both armor and protection. They've been around for over 200 million years, making them some of the oldest living creatures on Earth. 



You can find turtles in a variety of environments, from the depths of the ocean to freshwater ponds and even on land. Their ability to adapt to different habitats has allowed them to thrive across the globe, with hundreds of species showcasing a wide range of sizes, colors, and behaviors.



And where does this impressive ability to adapt come from? Apparently, it's their genome, which is proving to be very different from that of most other animals studied so far.



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



DNA molecules, with their long strands of nucleotides, carry extensive genetic data essential for life. How this genetic blueprint is stored in cells influences how it is read and used.&nbsp;



During cell division, DNA is tightly coiled around proteins, forming chromatin structures within chromosomes. 



After division, the chromosomes relax, and chromatin loosens, creating unique folding and looping patterns that determine which genes are activated or repressed. 



New research led by <a href="https://www.iastate.edu/" target="_blank" rel="noreferrer noopener">Iowa State University</a> offers insights into these processes, with implications for understanding evolution and potentially aiding biomedical research.



Study senior author Nicole Valenzuela is a professor of ecology, evolution, and organismal biology at Iowa State University.&nbsp;



“The three-dimensional structure of the chromatin when it’s folded matters for gene regulation. Where chromatin physically sits in the nucleus matters,” said Valenzuela.



“<a href="https://www.earth.com/news/how-do-animals-balance-their-sex-chromosomes/" target="_blank" rel="noreferrer noopener">Chromosome</a> folding remains a bit of a black box. We’ve learned a lot about it, but it’s still just the tip of the iceberg.”



<h2 class="wp-block-heading" id="h-role-of-chromatin-in-gene-regulation">Role of chromatin in gene regulation</h2>



In the post-division interphase stage of the cell cycle, the chromatin’s shape and location impact gene expression by bringing distant <a href="https://www.earth.com/news/plants-use-dna-duplication-to-increase-their-resilience/" target="_blank" rel="noreferrer noopener">DNA</a> regions into close contact.&nbsp;



For example, enhancers (DNA segments that promote gene expression) and gene promoters (regions that initiate transcription) can interact more readily in open, accessible regions of chromatin.&nbsp;



On the other hand, DNA in tightly packed chromatin regions remains less active. 



Through analyzing these contact points, researchers have developed models to map chromatin configurations across various species, such as humans, mice, birds, and more recently, <a href="https://www.earth.com/news/turtles-with-unique-features-are-most-likely-to-go-extinct/" target="_blank" rel="noreferrer noopener">turtles</a>.



<h2 class="wp-block-heading" id="h-unique-discovery-in-turtle-genomes">Unique discovery in turtle genomes</h2>



In a recent paper published in the journal <a href="http://dx.doi.org/10.1101/gr.279443.124" target="_blank" rel="noreferrer noopener">Genome Research</a>, Valenzuela’s team described the chromatin arrangement in the genomes of two turtle species, the spiny softshell and northern giant musk turtles, uncovering a structure previously unobserved in other organisms.&nbsp;



Chromosomes have two essential elements: the centromere, a constriction point, and telomeres, which cap each chromosome end. In humans, chromosomes occupy separate regions in the nucleus.&nbsp;



However, in some animals, like marsupials, centromeres cluster, while in birds, telomeres come together.&nbsp;



Turtles, interestingly, are the first species where both telomeres and centromeres align near each other, suggesting a unique chromatin arrangement.



“It’s possible this is the ancestral condition of amniotes, from which mammals, birds, and reptiles evolved in different patterns,” Valenzuela noted.&nbsp;



“The turtles may be showing us what existed at the beginning, shedding light on the evolution of vertebrate <a href="https://www.earth.com/news/genome-mapping-completed-for-dozens-of-common-animals/" target="_blank" rel="noreferrer noopener">genomes</a>.”



<h2 class="wp-block-heading" id="h-turtle-genomes-and-biomedical-science">Turtle genomes and biomedical science</h2>



Uncovering the chromatin structure in turtles and how it adapts to environmental changes could be valuable for biomedical science.&nbsp;



For example, some turtle species can survive weeks without oxygen, which could have implications for treating <a href="https://www.earth.com/news/could-blood-type-determine-your-stroke-risk/" target="_blank" rel="noreferrer noopener">strokes</a>. 



Similarly, understanding how certain turtles withstand extreme cold might inform techniques for cryogenic preservation of human tissues.



“We want to understand more about why different lineages are different in some aspects and why they’re the same in others, what parts we share and what parts differ,” Valenzuela explained.&nbsp;



“If we can reconstruct the evolutionary history of the changes that have taken place, we will be able to tell much more about how the differences in the packaging of the DNA and the folding of chromosomes might be affecting the traits we’re interested in, how genes are regulated, and how vertebrate genomes evolve.”



Additionally, understanding turtles’ chromatin structure could aid conservation efforts, offering insights into how environmental changes impact their biology and potential adaptations.



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



Valenzuela’s lab plans to extend their research to study more turtle species, adding to the current work on spiny softshell and northern giant musk turtles. 



Her team has already gathered data on four additional species, aiming to see if similar chromatin structures appear in genomes across different turtle lineages. 



The researchers are also interested in comparing turtle chromatin organization to that of other reptiles, such as <a href="https://www.earth.com/news/climate-and-ecology-shaped-250-million-years-of-crocodile-evolution/" target="_blank" rel="noreferrer noopener">crocodiles</a>, lizards, and snakes, to explore whether they share structural patterns.



To gain deeper insights, the team will study liver organoids - lab-grown tissue mimics they have developed for three turtle species. 



These organoids offer a simplified view of liver tissue, allowing the researchers to observe how chromatin folding might influence cellular function. 



Future work will include advanced mapping techniques that provide high-resolution chromatin data, helping to clarify how 3-D chromatin structures change over time and under various environmental conditions.



“To really do genotype-to-phenotype mapping, we have to get to this level of complexity,” Valenzuela concluded.



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Turtles have genomes unlike any other animal studied so far

Turtles are fascinating reptiles known for their distinctive shells, which...

Two years of severe drought in the State of Amazonas is having a devastating impact on one of the Amazon's noteworthy achievements - the sustainable economy based on catching the gargantuan pirarucu fish. This sustainability is now facing a dangerous headwind.



Almost 6,000 people residing by the rivers in Amazonas State, Brazil, are legally permitted to fish for this mammoth creature.



Regrettably, they have witnessed a dramatic decrease in pirarucu catches, combined with escalating costs. This has led to a widespread call for governmental support, and the urgent need to devise a strategy to adapt to the demands of our changing climate.



In the previous year, the catch reached only 70% of the 100,443 fish quota sanctioned by the government.



As we are in the height of the current year's season (which runs from June to November) many communities are yet to commence their <a href="https://www.earth.com/news/sustainable-fishing-must-be-redefined-to-halt-ocean-destruction/" target="_blank" rel="noreferrer noopener">fishing</a> due to the prevailing conditions. The outlook for this year's catch is far from optimistic.



<h2 class="wp-block-heading" id="h-the-tale-of-the-pirarucu">The tale of the pirarucu</h2>



Commencing in the Mamiraua region 25 years ago, managed fishing of the pirarucu has seen significant expansion. 



The successful management of the resource saved the Amazon's largest fish from becoming extinct and is now a vital source of income for locals in 10 sustainable conservation units and eight Indigenous territories. These areas boast negligible deforestation rates.



The giant pirarucu fish, that can weigh up to 200 kilograms (440 pounds), were historically resistant to climate changes, including <a href="https://www.earth.com/news/the-amazon-rainforest-and-the-looming-threat-of-drought/" target="_blank" rel="noreferrer noopener">droughts</a>.



However, today's low water levels have left Amazon fishers stranded, unable to transport their catch from isolated lakes to major rivers and cities.



In several areas, water levels decreased so rapidly that the transport connection was severed before the <a href="https://www.earth.com/news/early-summer-fishing-shrinks-atlantic-salmon-size-over-time/" target="_blank" rel="noreferrer noopener">fishing season</a> even started.



<h2 class="wp-block-heading" id="h-amazon-fishers-feel-the-impact">Amazon fishers feel the impact</h2>



In the São Raimundo community in the Medio Jurua region, fishing is commencing with a two-month delay, reflecting the current widespread situation. 



To mitigate the impact, Coletivo Pirarucu, an organization representing 2,500 families living by the river, along with Indigenous families, has called for an extension of the fishing season until the end of January.



Even major rivers are not spared. As a result, navigation has been difficult, resulting in escalating costs and uncertainty amongst fishers.



The journey to transport fish from Carauari, a principal pirarucu producer, to the largest city of the <a href="https://www.earth.com/news/smallest-pollution-particles-affect-rainfall-in-the-amazon/" target="_blank" rel="noreferrer noopener">Amazon</a>, Manaus, usually takes up to four days. However, during the drought's peak, this journey extended to ten days, and the transport cost doubled.



According to researcher Adalberto Luis Val from the <a href="https://www.gov.br/inpa/pt-br" target="_blank" rel="noreferrer noopener">National Institute for Amazonian Research</a>, even the robust pirarucu is not immune to climate change. 



“No fish can regulate body temperature. Then there's water scarcity. As its level drops, you start to get a high amount of suspended material, leading to sludge build-up. It sticks to the gill area, blocking the processes that occur there," explained Val.



<h2 class="wp-block-heading" id="h-seeking-support-for-amazon-fishers">Seeking support for Amazon fishers</h2>



Coletivo Pirarucu is advocating for fishermen to receive compensation for the losses brought on by climate change.



They issued an open letter last week, expressing their concerns and calling for the development of “climate change adaptation and mitigation strategies.”



At a higher level, James Bessa, a federal official responsible for pirarucu management, confirmed that Ibama, Brazil's environmental body, is collaborating with other public bodies and local fishing associations to minimize the impact of <a href="https://www.earth.com/news/droughts-and-extreme-weather-events-are-escalating/" target="_blank" rel="noreferrer noopener">extreme weather events</a>.



Lastly, Adevaldo Dias, a riverine leader and president over the Chico Mendes Memorial, has made a plea for climate justice. 



“The Indigenous and riverine peoples have minimal impact on the environment. We know that conserving the forest benefits both us and those outside it. And when extreme climate events occur, they are the most vulnerable," said Dias.



<h2 class="wp-block-heading" id="h-the-uncertain-future-of-the-fishing-trade">The uncertain future of the fishing trade</h2>



The ongoing droughts have raised pressing questions about the sustainability of the pirarucu fishing trade and the resilience of the communities that depend on it. 



Experts fear that without swift and effective intervention, the balance achieved through decades of conservation efforts could unravel.



The challenges faced by riverine and Indigenous communities extend beyond immediate economic hardship; they highlight a deeper vulnerability tied to the changing climate.



Efforts to protect the pirarucu and ensure that its harvest remains a cornerstone of the Amazon's sustainable economy are at a crossroads.



If the current trend continues, the once-thriving pirarucu trade may face further obstacles, impacting food security, local livelihoods, and conservation outcomes.



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Amazon drought: Fishers in crisis as their biggest catch disappears

Two years of severe drought in the State of Amazonas...

The holiday season, filled with festive gatherings and delicious food, can be challenging for anyone committed to a healthy lifestyle.&nbsp;



A new national survey by <a href="https://www.orlandohealth.com/" target="_blank" rel="noreferrer noopener">Orlando Health</a> finds that nearly 40% of Americans worry about overeating during the <a href="https://www.earth.com/news/more-people-die-from-heart-attacks-during-the-holidays/" target="_blank" rel="noreferrer noopener">holidays</a>. However, experts reassure that a few holiday treats are not a cause for guilt or concern over weight gain long-term health impacts.



“Holidays come around once a year, and indulging in a few traditional foods and favorite recipes that may have a little extra sugar or fat is not going to affect your health or derail your healthy habits,” said Sara Riehm, a registered dietitian at Orlando Health.&nbsp;



Riehm notes that, for many, the anxiety about holiday <a href="https://www.earth.com/news/eating-nuts-every-day-does-not-cause-weight-gain-but-it-does-improve-health/" target="_blank" rel="noreferrer noopener">weight gain</a> far outweighs actual weight gain during this time.



<h2 class="wp-block-heading" id="h-healthy-holiday-habits">Healthy holiday habits</h2>



The survey also revealed some common yet counterproductive tactics people use to avoid overindulgence.&nbsp;



One in four respondents, for instance, skip meals before a holiday event in an attempt to “save” calories. Riehm warns against this strategy, as it often leads to overconsumption once hunger takes over.



“It’s a lot easier to make healthier decisions when we're not hungry. Having a light meal with protein and fiber before a party helps you feel fuller and make mindful choices about what you’re eating,” Riehm advised.



She suggests balancing a serving of a favorite holiday treat with nutritious options like <a href="https://www.earth.com/news/how-fruits-and-vegetables-improve-heart-health/" target="_blank" rel="noreferrer noopener">vegetables</a> or a fruit salad to ensure a balanced plate.



<h2 class="wp-block-heading" id="h-debunking-the-detox-myth">Debunking the “detox” myth</h2>



Another common response to holiday indulgence is the urge to “detox” or “cleanse” afterward. The survey showed that a third of people feel the need to detox post-holidays, believing it will offset any negative effects of holiday treats.&nbsp;



However, Riehm explains that these detox measures are not only ineffective but could also pose health risks.



“We can't really detox the body from the so-called ‘toxins’ that we're getting from our food,” she said. “Our liver and kidneys are already designed to remove toxins from the body without the need for juices or supplements.”&nbsp;



She further cautions that detox methods often involve extreme calorie restrictions, potentially leading to dangerous drops in blood sugar and disturbing <a href="https://www.earth.com/news/new-tool-detects-changes-in-gut-health-to-help-prevent-disease/" target="_blank" rel="noreferrer noopener">gut health</a>.



<h2 class="wp-block-heading" id="h-healthy-goals-in-the-holiday-season">Healthy goals in the holiday season </h2>



Rather than resorting to drastic measures, Riehm recommends seeking guidance from a registered dietitian to help manage a balanced and sustainable plan through the holiday season and beyond.



“With so much information, misguided advice, and pseudoscience out there, registered dietitians are going to be your number one source for evidence-based nutrition information,” she said.&nbsp;



According to Riehm, dietitians, unlike self-designated nutritionists, are licensed to provide medical nutrition therapy, making them a reliable resource for developing lasting, health-centered strategies.



<h2 class="wp-block-heading" id="h-making-informed-choices">Making informed choices </h2>



For Joshua Walker, a participant in a six-week lifestyle program at the Orlando Health Center for Health Improvement, working with Riehm revealed surprising insights into his <a href="https://www.earth.com/news/a-healthy-diet-can-reduce-brain-aging/" target="_blank" rel="noreferrer noopener">diet</a>. 



Walker, who carefully manages his diet and exercise, discovered that foods he once considered healthy were elevating his blood sugar.



“I was eating tons of carbs and fruit, and that turns into sugar inside the body,” Walker explained.&nbsp;



Through minor adjustments guided by Riehm, he stabilized his blood sugar and feels confident that he can navigate the holidays without compromising his health goals.&nbsp;



Walker now enjoys the flexibility to indulge without fear: “If Grandma made an apple pie that I’m just looking at and it’s speaking my name, I’ll go ahead and eat a slice.”



<h2 class="wp-block-heading" id="h-consistency-over-perfection">Consistency over perfection</h2>



Riehm emphasizes that sustainable health is built on consistency and flexibility rather than strict avoidance.&nbsp;



“No diet or healthy habit is going to be successful in the long term without a little bit of flexibility,” she said.&nbsp;



Rather than fixating on each meal, Riehm advocates a balanced approach: “The same way that one healthy meal is not going to make a huge difference in your health outcomes, having one unhealthy meal is also not going to make a huge difference.”



Ultimately, the key to maintaining a healthy weight over the holidays is to enjoy traditional foods in moderation and make informed, mindful choices without guilt. 



Embracing this balanced perspective allows holiday celebrations to be a joyful experience rather than a source of stress.



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Worried about holiday weight gain? Here's what the experts say

The holiday season, filled with festive gatherings and delicious food,...

Researchers recently revealed a stunning new species of sea slug glowing in the ocean's darkest depths. Known as the "mystery mollusk" or&nbsp;Bathydevius caudactylus, this nudibranch inhabits the ocean's midnight zone, one of Earth's least-explored realms.



This discovery is more than just a new name on a species list - it's an illuminating dive into our planet's vast, hidden ecosystems.



<h2 class="wp-block-heading" id="h-mystery-mollusk-in-the-midnight-zone">Mystery mollusk in the midnight zone</h2>



The "mystery mollusk," Bathydevius caudactylus as the scientists officially named it, inhabits the <a href="https://www.earth.com/news/highly-unusual-bacteria-discovered-in-deep-sea-corals/" target="_blank" rel="noreferrer noopener">ocean's deep abyss</a>, also known as the midnight zone.



But this isn't just about a new species - it's about an exciting lifeline into understanding our planet's largest habitat in more depth.



Monterey Bay Aquarium Research Institute (<a href="https://www.mbari.org" target="_blank" rel="noreferrer noopener">MBARI</a>) Senior Scientist Bruce Robison steered this explorative venture.



“Thanks to MBARI’s advanced underwater technology, we were able to prepare the most comprehensive description of a deep-sea animal ever made," noted Robison.



"We've invested more than 20 years in understanding the natural history of this fascinating species of nudibranch. Our discovery is a new piece of the puzzle that can help better understand the largest habitat on Earth."



<h2 class="wp-block-heading" id="h-identifying-the-mystery-mollusk">Identifying the mystery mollusk</h2>



This unusual sea creature was first spotted in the year 2000, during an expedition using the institute's remotely operated vehicle (ROV) named Tiburon. It was found gliding through the waters offshore of Monterey Bay at a depth of 2,614 meters (8,576 feet).



Confusion arose when the team initially struggled to identify this creature due to its anomalous appearance - a voluminous hood, a flat tail fringed with numerous, finger-like projections, and a set of colorful internal organs.



But after years of research and countless ROV sightings, the <a href="https://www.earth.com/news/sea-pigs-unicumbers-strange-stunning-creatures-discovered-abyssal-plains-ccz/" target="_blank" rel="noreferrer noopener">mystery</a> was solved - this strange creature is, in fact, a nudibranch or sea slug.



<div class="wp-block-sendtonews-playerselector">[sendtonews key="rLItWTv9qr-4019991-12187" type="single"]</div>



<h2 class="wp-block-heading" id="h-a-nudibranch-unlike-any-other">A nudibranch unlike any other</h2>



The mystery mollusk isn't your ordinary nudibranch. It's the first of its kind known to dwell in the immense open waters of the bathypelagic zone, a region 1,000 to 4,000 meters (3,300 to 13,100 feet) below the ocean surface.



Also, the sightings of this fascinating creature span the Pacific coast of North America, from Oregon to as far south as Southern California. Plus, similar creatures spotted by NOAA researchers in the Mariana Trench hint at the mollusk's potentially widespread existence.



<h2 class="wp-block-heading" id="h-survival-techniques-of-the-sea-slug">Survival techniques of the sea slug</h2>



Surviving in such harsh environments is no easy feat. How does the mystery mollusk manage? Interestingly, it has evolved unique survival strategies.



For instance, unlike most sea slugs that feed by rasping prey off the <a href="https://www.earth.com/news/ocean-life-100-new-sea-creatures-found-in-chile/" target="_blank" rel="noreferrer noopener">seafloor</a>, it uses its cavernous hood to trap crustaceans, much like a Venus flytrap plant would do.



Moreover, to avoid predators, it has a clear body that blends with the surrounding waters and can emit a bright bioluminescence to deter and distract hungry predators. 



“When we first filmed it glowing with the ROV, everyone in the control room let out a loud ‘Oooooh!’ at the same time. We were all enchanted by the sight,” said MBARI senior scientist Steven Haddock.



“Only recently have cameras become capable of filming bioluminescence in high-resolution and in full color. MBARI is one of the only places in the world where we have taken this new technology into the deep ocean, allowing us to study the luminous behavior of deep-sea animals in their natural habitat.”



<h2 class="wp-block-heading" id="h-nudibranch-family-tree-expands">Nudibranch family tree expands</h2>



Beyond its captivating appearance and survival tactics, what really stood out during the research was the mollusc's genetic uniqueness. 



Detailed examination of specific gene sequences emphasized that the mystery mollusk is distinct enough from other known nudibranchs to merit the creation of a new family, Bathydeviidae.



"What is exciting to me about the mystery mollusk is that it exemplifies how much we are learning as we spend more time in the deep sea, particularly below 2,000 meters," said Haddock.



"For there to be a relatively large, unique, and glowing animal that is in a previously unknown family really underscores the importance of using new technology to catalog this vast environment. The more we learn about deep-sea communities, the better we will be at ocean decision-making and stewardship.”



<h2 class="wp-block-heading" id="h-wealth-of-deep-sea-discoveries">Wealth of deep-sea discoveries</h2>



This discovery is just one exciting piece in the puzzle of <a href="https://www.earth.com/news/new-species-of-deep-sea-squid-discovered-that-broods-giant-eggs/" target="_blank" rel="noreferrer noopener">deep-sea exploration</a>. MBARI's state-of-the-art technology has unveiled over 250 previously unknown deep-sea species to date, encouraging us to plunge deeper into these fascinating, otherworldly realms.



“Deep-sea animals capture the imagination. These are our neighbors that share our blue planet. Each new discovery is an opportunity to raise awareness about the deep sea and inspire the public to protect the amazing animals and environments found deep beneath the surface,” said Robison.



Indeed, each new discovery brings us one step closer to fully understanding and protecting our fascinating blue planet. And with this latest revelation of the mystery mollusk, we get to marvel at another fascinating dweller of the deep.



The study is published in the journal <a href="https://www.sciencedirect.com/science/article/pii/S0967063724001845?via%3Dihub" target="_blank" rel="noreferrer noopener">Deep Sea Research</a>.



Image/ Video Credit: MBARI



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Mystery mollusk: Glowing sea slug found in the deep sea

Researchers recently revealed a stunning new species of sea slug...

The 2024 United Nations Global Nitrous Oxide Assessment, unveiled at COP29 in Baku, Azerbaijan, highlights the accelerating impact of nitrous oxide (N₂O) emissions on climate change and the ozone layer. 



Conducted by the <a href="https://www.unep.org/" target="_blank" rel="noreferrer noopener">United Nations Environment Program</a> (UNEP) and the Food and Agriculture Organization (FAO), the report raises serious concerns about the rapid rise in <a href="https://www.earth.com/news/nitrous-oxide-emissions-have-increased-at-an-unprecedented-rate/" target="_blank" rel="noreferrer noopener">N₂O emissions</a>, emphasizing that immediate action is required to mitigate its severe environmental and health consequences.



<h2 class="wp-block-heading" id="h-more-potent-than-carbon-dioxide">More potent than carbon dioxide</h2>



Nitrous oxide, a greenhouse gas approximately 270 times more potent than <a href="https://www.earth.com/news/how-carbon-dioxide-travels-in-the-atmosphere/" target="_blank" rel="noreferrer noopener">carbon dioxide</a> in warming the planet, currently accounts for around 10% of net global warming since the start of the industrial era. 



While it’s predominantly released through agricultural practices like synthetic fertilizer and manure use, it’s also emitted by the chemical industry, making it the third most impactful greenhouse gas and the top ozone-depleting substance still entering the atmosphere.



<h2 class="wp-block-heading" id="h-n₂o-emissions-jeopardize-climate-goals">N₂O emissions jeopardize climate goals</h2>



The report underscores that rising N₂O emissions jeopardize the ability to limit <a href="https://www.earth.com/news/earths-volcanic-past-reveals-the-shocking-reality-of-global-warming/" target="_blank" rel="noreferrer noopener">global warming</a> to 1.5°C, warning that failure to reduce emissions could derail efforts to achieve the Paris Agreement’s climate targets. 



Without urgent action on rising N₂O emissions, there is no viable pathway to limiting global warming to 1.5°C, the report states, advocating for reductions that could lower emissions by over 40% from current levels.



The potential health impacts of unchecked N₂O emissions are equally alarming. Continued emissions could raise global UV exposure, leading to increased skin cancers and cataracts.&nbsp;



Proactively addressing N₂O would also support the <a href="https://www.earth.com/news/antarctic-ozone-hole-may-fully-recover-by-2066/" target="_blank" rel="noreferrer noopener">ozone layer</a>’s recovery, which protects human health by reducing exposure to harmful ultraviolet radiation.



“Addressing nitrous oxide emissions is essential for ensuring sustainable, inclusive, and resilient agriculture that simultaneously helps countries achieve their climate and food security goals,” said Kaveh Zahedi, Director of FAO’s Office of Climate Change, Biodiversity, and Environment.



<h2 class="wp-block-heading" id="h-reducing-n₂o-could-prevent-millions-of-deaths">Reducing N₂O could prevent millions of deaths</h2>



In addition to its climate impact, reducing N₂O emissions would provide substantial public health benefits. The report estimates that simultaneously reducing N₂O, nitrogen oxides, and ammonia emissions could prevent up to 20 million premature deaths globally by 2050, largely due to improved air quality.&nbsp;



By transforming agricultural practices and reducing excessive nitrogen use, societies could also improve water and soil quality, which are essential for <a href="https://www.earth.com/news/groundwater-plays-critical-role-ecosystem-health/" target="_blank" rel="noreferrer noopener">ecosystem health</a>.



“A sustainable nitrogen management approach not only reduces nitrous oxide emissions but also prevents the release of other harmful nitrogen compounds,” explained A.R. Ravishankara, Co-Chair of the Assessment and atmospheric scientist at <a href="https://www.colostate.edu/" target="_blank" rel="noreferrer noopener">Colorado State University</a>. 



“This could improve air and water quality, protect ecosystems, and safeguard human health, all while maintaining food security.”



<h2 class="wp-block-heading" id="h-pathways-to-reduce-emissions-nbsp">Pathways to reduce emissions&nbsp;</h2>



The UN assessment outlines a series of cross-sectoral strategies to cut N₂O emissions significantly, including optimizing nitrogen use in agriculture and adopting cleaner practices in the chemical industry.



“Abating N₂O emissions could avoid up to 235 billion tons of CO₂-equivalent emissions by 2100 - this is equivalent to six years' worth of current global carbon dioxide emissions from fossil fuels,” said David Kanter, Co-Chair of the Assessment and associate professor at <a href="https://www.nyu.edu/" target="_blank" rel="noreferrer noopener">New York University</a>.



To achieve these reductions, the report advocates for a holistic approach to nitrogen management. By reducing nitrogen application and employing targeted fertilizer practices, the agricultural sector could decrease N₂O emissions while maintaining productivity.&nbsp;



This would not only help to stabilize the climate but also reduce <a href="https://www.earth.com/news/excess-nutrients-are-creating-ocean-dead-zones/" target="_blank" rel="noreferrer noopener">nutrient</a> runoff that negatively impacts aquatic and terrestrial ecosystems.



<h2 class="wp-block-heading" id="h-securing-the-ozone-layer">Securing the ozone layer</h2>



The report emphasizes that reducing N₂O emissions would aid the recovery of the ozone layer, which has been a focus of global environmental protection since the Montreal Protocol’s inception.&nbsp;



“The ozone layer is crucial for all life on Earth,” said Megumi Seki, Executive Secretary of the Montreal Protocol Ozone Secretariat.&nbsp;



“For decades, parties to the Montreal Protocol have worked hard to safeguard it. This UN assessment highlights the need for continued vigilance, commitment, and action for the ozone layer to recover.”



<h2 class="wp-block-heading" id="h-relatively-forgotten-super-pollutant-nbsp">Relatively forgotten super pollutant&nbsp;</h2>



Martina Otto, head of the Secretariat of the UNEP Climate and Clean Air Coalition, stresses that immediate action could yield wide-ranging benefits across climate, air quality, and health.&nbsp;



“This assessment sounds the alarm on a relatively forgotten super pollutant that contributes greatly to climate change and air pollution,” said Otto. “By using the abatement tools highlighted in the assessment that are already available to us, we can yield multiple benefits across climate, clean air, and health.”



The assessment calls for urgent implementation of these strategies, emphasizing that coordinated action to reduce N₂O emissions could bring about significant improvements in global health and environmental stability.&nbsp;



With the tools and knowledge now available, governments, industries, and individuals can contribute to a cleaner, healthier planet, aligning efforts to meet critical climate, food security, and health goals.



The report can be found <a href="https://www.unep.org/resources/report/global-nitrous-oxide-assessment" target="_blank" rel="noreferrer noopener">here</a>.



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Nitrous oxide emissions are a growing threat to human and planetary health

The 2024 United Nations Global Nitrous Oxide Assessment, unveiled at...

An asteroid impact on Mars 11 million years ago sent fragments of the red planet hurtling through space. One of these pieces eventually crashed into Earth, making its way to Purdue University and becoming known as the Lafayette Meteorite.&nbsp;



This rare find has been instrumental in unlocking secrets of <a href="https://www.earth.com/news/manganese-discovery-ancient-mars-earth-like-water-lake-habitable/" target="_blank" rel="noreferrer noopener">Mars</a>’ watery past, with new research recently published in the journal <a href="http://dx.doi.org/10.7185/geochemlet.2443" target="_blank" rel="noreferrer noopener">Geochemical Perspective Letters</a> that provides insight into the timing and nature of Mars’ ancient water activity.



<h2 class="wp-block-heading" id="h-tracing-mars-watery-past">Tracing Mars’ watery past</h2>



Scientists have long known that the Lafayette Meteorite interacted with liquid water on Mars, but the exact timing of this event was uncertain.&nbsp;



Dr. Marissa Tremblay, an assistant professor at Purdue University’s <a href="https://www.eaps.purdue.edu/" target="_blank" rel="noreferrer noopener">Department of Earth, Atmospheric, and Planetary Sciences</a> (EAPS), led an international research team to determine the age of the water-altered minerals in the meteorite, pinpointing it to 742 million years ago.



“Dating these minerals can therefore tell us when there was liquid water at or near the surface of Mars in the planet's geologic past,” Tremblay explained.&nbsp;



The findings suggest that while liquid water wasn’t abundant on the surface at this time, it likely came from melting subsurface ice, or permafrost, caused by intermittent volcanic activity - a phenomenon still observed on Mars today.



<h2 class="wp-block-heading" id="h-preserving-a-moment-in-mars-geological-timeline">Preserving a moment in Mars’ geological timeline</h2>



The study not only identified when water interacted with the meteorite but also established that the dating was unaffected by events after the meteorite left Mars.&nbsp;



“The age could have been affected by the impact that ejected the Lafayette Meteorite from Mars, the heating it experienced during the 11 million years it was floating in space, or the heating when it fell to Earth,” Tremblay said.&nbsp;



However, the team confirmed that none of these factors altered the age, validating the timeline of <a href="https://www.earth.com/news/mars-lost-most-of-its-water-but-where-did-it-go/" target="_blank" rel="noreferrer noopener">water</a> interaction.



Study co-author and Purdue EAPS researcher Ryan Ickert applied heavy isotope analysis to further verify that previous data on the meteorite’s water-rock interaction had likely been skewed by other geological processes.&nbsp;&nbsp;



“This meteorite uniquely has evidence that it has reacted with water. The exact date of this was controversial, and our publication dates when water was present,” said Ickert.



<h2 class="wp-block-heading" id="h-mysterious-journey-of-the-meteorite">Mysterious journey of the meteorite </h2>



The Lafayette Meteorite’s journey to Purdue is something of a mystery. It was found in a university drawer in 1931, though how it got there remains unknown.&nbsp;



In previous research, Tremblay and her team used crop disease markers from organic contaminants found on the meteorite to narrow down when it might have fallen to Earth.



Once the meteorite was ejected from Mars, it endured constant cosmic ray bombardment in space, which produced certain isotopes, offering clues to its time of impact on Earth.&nbsp;



“Many meteoroids are produced by impacts on Mars and other planetary bodies, but only a handful will eventually fall to Earth,” Tremblay said.



<h2 class="wp-block-heading" id="h-planetary-time-capsules">Planetary time capsules</h2>



Meteorites like Lafayette serve as planetary time capsules, offering invaluable data on the geological and environmental history of their <a href="https://www.earth.com/news/most-meteorites-can-be-traced-to-three-asteroid-families/" target="_blank" rel="noreferrer noopener">home worlds</a>. With their dense structure, metallic content, and magnetic properties, meteorites are often distinguishable from Earth rocks.&nbsp;



“We can identify meteorites by studying what minerals are present in them, their mineral relationships, and by checking for a fusion crust formed during entry into Earth’s atmosphere,” Tremblay explained.&nbsp;



By analyzing these traits and their chemical signatures, scientists can often determine a meteorite’s planetary origin.



<h2 class="wp-block-heading" id="h-complex-history-of-meteorites">Complex history of meteorites</h2>



This research marks a significant milestone for the team, which included scientists from institutions across the globe, such as the Scottish Universities Environmental Research Center (SUERC), the University of St. Andrews, the University of Glasgow, the University of Bristol, and London’s <a href="https://www.nhm.ac.uk/" target="_blank" rel="noreferrer noopener">Natural History Museum</a>.&nbsp;



“Before moving to Purdue, Ryan and I were both based at SUERC, where the argon-argon isotopic analyses of the alteration minerals in Lafayette took place,” Tremblay said.&nbsp;



Their partners at SUERC and the Natural History Museum have long contributed to studying Lafayette’s complex history.



<h2 class="wp-block-heading" id="h-dating-minerals-in-meteorites">Dating minerals in meteorites</h2>



Dating the water-altered minerals in Lafayette, and others in its class of Martian meteorites called nakhlites, has been a central focus in planetary science, as they uniquely capture moments when liquid water was present on Mars.&nbsp;



Due to complex alterations over time, previous attempts to date these minerals were plagued with uncertainties.&nbsp;



However, the team has now developed a robust dating method that could be applied to other meteorites, enhancing our understanding of when water might have been present on Mars and other planetary bodies.



<h2 class="wp-block-heading" id="h-the-future-of-planetary-science">The future of planetary science</h2>



Thanks to the Stahura Undergraduate Meteorite Fund, Tremblay and Ickert’s research on the Lafayette Meteorite will continue, with the involvement of undergraduate students in Purdue EAPS.&nbsp;



This opportunity allows students to engage in real-world planetary science, helping to reveal the intricate histories of meteoritic samples.



Tremblay and her team’s work on the Lafayette Meteorite highlights its scientific significance, revealing a complex history that ties it to Mars’ geological past.&nbsp;



Their findings not only deepen our understanding of Mars but also set a precedent for future studies that might unveil even more about the red planet’s climate history, water activity, and potential for supporting <a href="https://www.earth.com/news/some-mars-rocks-contain-signs-of-life-scientists-call-to-bring-them-back-to-earth/" target="_blank" rel="noreferrer noopener">life</a>.



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Meteorite that struck Mars reveals when the planet had liquid water

An asteroid impact on Mars 11 million years ago sent...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



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

Nushagak Bay in southwest Alaska

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



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



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



Video/ Image Credit: American Chemical Society&nbsp;



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



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

Flu viruses are more flexible than expected

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

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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

Lake Trasimeno in Central Italy

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



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



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

Detecting mercury contamination with the tap of a finger

[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...

Today’s Image of the Day comes thanks to the <a href="http://www.esa.int/spaceinimages/Images/2017/07/Vesuvius_on_fire">European Space Agency (ESA)</a> and features a look at fires blazing on Mount Vesuvius.
The wildfires ignited following an extended period of high temperatures and significant drought in Italy. The smoke and ash caused some to wonder if the volcano was on the verge of eruption.
Mount Vesuvius is of course infamous for its 79 C.E. eruption that buried the city of <a href="https://www.earth.com/news/volcanoes-erupt-next/">Pompeii</a>. The volcano hasn’t erupted since 1944.
This image was captured by the Sentinel-2B satellite on July 12th, 2017.
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By <a href="mailto:rarnold@earth.com">Rory Arnold</a>, <a href="https://www.earth.com/staff">Earth.com</a> Staff Writer
Source: <a href="http://www.esa.int/spaceinimages/Images/2017/07/Vesuvius_on_fire">European Space Agency</a>

Mount Vesuvius on fire

Today’s Image of the Day comes thanks to the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> and features a look at sunset at the International Space Station.

The photo was taken by astronauts over the Indian Ocean and shows a unique view of the different layers of the Earth’s atmosphere. 

The orange and yellow layers represent the troposphere, which stretches from the Earth’s surface to 6 - 20 kilometers high. 

The pink and white layers represent the lower stratosphere, which stretches up to 50 kilometers above the Earth’s surface and usually contains very few <a href="https://www.earth.com/image/glowing-clouds-virginia-skies/">clouds</a>.

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By <a href="mailto:rarnold@earth.com">Rory Arnold</a>, <a href="http://earth.com/staff">Earth.com</a> Staff Writer

Source: <a href="https://earthobservatory.nasa.gov/IOTD/view.php?id=44267&amp;eocn=image&amp;eoci=related_image">NASA Earth Observatory</a>