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...

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

Today's Image of the Day from the European Space Agency features the colors of fall across the continent of Europe. 



“This compilation of images, captured by the Copernicus Sentinel-2 mission, showcases the characteristic hues of autumn in different European countries,” noted <a href="https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-2/Earth_from_Space_Autumn_foliage_across_Europe" target="_blank" rel="noreferrer noopener">ESA</a>.



“Autumn foliage is one of nature's most stunning displays, turning deciduous forests into landscapes painted with vibrant colors. As temperatures cool and daylight shortens, deciduous trees cease producing chlorophyll so that leaves turn yellow, orange and red – the colors of autumn.”



<h2 class="wp-block-heading" id="h-colors-of-fall-in-europe-nbsp">Colors of fall in Europe&nbsp;</h2>



The colors of <a href="https://www.earth.com/news/fall-will-be-unusually-warm-across-most-us-states/" target="_blank" rel="noreferrer noopener">fall</a> vary across regions due to the diversity of tree species and the climate.



<h3 class="wp-block-heading" id="h-northern-europe">Northern Europe</h3>



In countries like Norway, Sweden, and Finland, vibrant yellows and golds dominate, especially in forests of birch and aspen. Deep red hues come from the native rowan and some types of maple.



<h3 class="wp-block-heading" id="h-western-and-central-europe">Western and Central Europe</h3>



The landscapes of France, Germany, and Switzerland showcase golden and copper tones. Beech, oak, and chestnut trees create waves of yellow and bronze, while occasional maples provide shades of bright red.



<h3 class="wp-block-heading" id="h-eastern-europe">Eastern Europe</h3>



Countries like Poland, Ukraine, and Hungary experience a full mix of autumn colors, with maple and <a href="https://www.earth.com/news/should-we-cut-down-all-oak-trees-isoprene-emissions-air-pollution-climate-change/" target="_blank" rel="noreferrer noopener">oak forests</a> turning red and orange. The Carpathian Mountains are especially vibrant during this season.



<h3 class="wp-block-heading" id="h-southern-europe">Southern Europe</h3>



In Mediterranean areas like Italy, Spain, and Greece, fall colors are more subtle but still beautiful. Although many <a href="https://www.earth.com/news/trees-struggling-to-breathe-store-co2-hotter-climate/" target="_blank" rel="noreferrer noopener">trees</a> are evergreen, higher elevations display patches of golden-yellow and rusty tones from poplars, chestnuts, and maples.



The European fall color season typically peaks in October, depending on altitude and latitude. The dramatic landscapes of Europe - mountains, lakes, and historic villages - further enhance the stunning display of autumn colors across the continent.



<h2 class="wp-block-heading" id="h-why-do-the-leaves-change-colors">Why do the leaves change colors?</h2>



Leaves change color in the fall due to changes in daylight, temperature, and the chemical processes within the leaves.&nbsp;



During spring and summer, leaves are green because they contain chlorophyll, a pigment that allows them to absorb sunlight and produce food through photosynthesis.&nbsp;



However, as the days get shorter and temperatures drop in the fall, trees begin preparing for winter by slowing down their food production.



<h3 class="wp-block-heading" id="h-decrease-in-chlorophyll">Decrease in chlorophyll</h3>



With less sunlight, trees stop producing chlorophyll, which is highly sensitive to light and temperature. As chlorophyll breaks down, the green color fades, revealing other pigments in the leaves.



<h3 class="wp-block-heading" id="h-other-pigments-emerge-nbsp">Other pigments emerge&nbsp;</h3>



There are always other pigments in the leaves, but they’re hidden by the green chlorophyll during the growing season. In fall, these pigments become visible.



Carotenoids produce yellow and orange hues, which we see in trees like birch, beech, and aspen.



Anthocyanins are pigments that create reds, purples, and deep oranges. They form in the fall when sugars get trapped in the leaves. Trees like maple and sumac are known for their red and purple leaves.



Tannins produce brown colors and are especially visible in oaks.



<h3 class="wp-block-heading" id="h-weather-and-climate-influence">Weather and climate influence</h3>



Temperature, sunlight, and soil moisture also affect the intensity and duration of fall colors.&nbsp;



Sunny days and cool nights help produce more vibrant reds and purples. Wet or cloudy weather, on the other hand, can lead to more muted colors.



Ultimately, the color change is a part of the tree’s preparation for winter dormancy. By shedding <a href="https://www.earth.com/news/secrets-of-aging-discovered-in-plant-leaves/">leaves</a>, trees conserve water and energy, improving their chances of surviving the winter months.



<h2 class="wp-block-heading" id="h-how-do-the-fall-colors-affect-us">How do the fall colors affect us?</h2>



Fall colors can have a significant impact on us emotionally, mentally, and even physically. They provide us with a sense of warmth, nostalgia, and comfort.&nbsp;



<h3 class="wp-block-heading" id="h-emotional-uplift-nbsp">Emotional uplift&nbsp;</h3>



The vibrant colors of fall can evoke positive emotions and improve our mood. Studies show that exposure to natural landscapes with diverse colors can reduce stress, enhance feelings of happiness, and promote a sense of well-being.



Nature’s changing colors have a calming effect on our minds, providing mental clarity and relaxation. The natural beauty of fall landscapes can encourage mindfulness, allowing us to be present and appreciate our surroundings, which is beneficial for mental health and focus.



<h3 class="wp-block-heading" id="h-connection-to-nature">Connection to nature</h3>



Autumn’s beauty encourages people to go outside, whether it’s hiking through colorful forests, driving along scenic routes, or simply taking a walk in the park.&nbsp;



This connection with <a href="https://www.earth.com/news/nature-walking-quantifiably-improves-brain-health-and-functioning/" target="_blank" rel="noreferrer noopener">nature</a> has benefits for physical health, improving immunity and reducing blood pressure, and it also strengthens our environmental appreciation.



<h3 class="wp-block-heading" id="h-seasonal-reflection-nbsp">Seasonal reflection&nbsp;</h3>



The cycle of fall reminds us of change, letting go, and renewal. For many, fall is a time for introspection and resetting goals, as the season symbolizes transformation and the approach of a new chapter in life.



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Fall colors transform Europe's landscape 

Today's Image of the Day from the European Space Agency features Mount Fuji, Japan’s highest peak, where snow has finally returned after a record-breaking absence.



The Japan Meteorological Agency officially confirmed the presence of snow on Mount Fuji's peak on Thursday. The previous day, the snow could not yet be confirmed due to clouds obstructing the view of the summit.



“The Copernicus Sentinel-2 mission captured this image of Mount Fuji's iconic snowcap on November 7, a day after snow was first spotted by the Japan Mereological Agency’s Shizuoka branch,” noted <a href="https://search.app?link=https%3A%2F%2Fwww.esa.int%2FESA_Multimedia%2FImages&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">ESA</a>.



<h2 class="wp-block-heading" id="h-mount-fuji-with-no-snow">Mount Fuji with no snow</h2>



This year, Mount Fuji set a new <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fmount-fujis-snow-is-missing-for-first-time-in-130-years%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">record</a> for the latest date without snowfall since records began in 1894. By the end of October, the iconic peak remained bare, surpassing the previous records of October 26, held in 2016 and 1955. 



The snow delay is attributed to record-breaking high temperatures in Japan throughout the summer and early fall.&nbsp;



The heat was influenced by factors such as El Niño, unusually warm <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fpacific-ocean-temperatures-highest-in-650-years-greatly-harming-coral-reefs%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">sea surface temperatures</a>, and shifts in the jet stream - all of which contributed to sustained warmth and hindered the usual cooling needed for snowfall​​​​​​.



<h2 class="wp-block-heading" id="h-broader-climate-concerns">Broader climate concerns</h2>



This unusual absence of snow on Mount Fuji has raised concerns about broader impacts of climate change. Snow on Mount Fuji contributes to regional freshwater supplies, suggesting potential downstream effects on water availability if these trends continue.&nbsp;



Scientists are closely studying these seasonal shifts to understand their long-term environmental implications​​​​.



<h2 class="wp-block-heading" id="h-cultural-significance-of-mount-fuji-s-snow">Cultural significance of Mount Fuji's snow</h2>



Snow on Mount Fuji holds deep cultural significance for Japan, symbolizing purity, beauty, and spiritual presence. In Japanese art and literature, the snow-capped Mount Fuji is celebrated as a representation of the changing seasons, serenity, and natural perfection. 



For centuries, it has inspired countless artists, including Edo-period woodblock masters like Hokusai, whose famous series Thirty-Six Views of Mount Fuji highlights the mountain's snowy peak as a central theme.



The snow on Mount Fuji also holds spiritual significance. Many Japanese people view the mountain as sacred and associate its snow-covered peak with divine purity and tranquility. 



Shinto and Buddhist pilgrims have historically considered Fuji’s summit a place of spiritual connection, and its snowy cap enhances this reverence by emphasizing the mountain’s sublime, almost otherworldly beauty​​​​.



Mount Fuji and its snow cap have become a national symbol of resilience and identity, even influencing aspects of Japanese aesthetics. The snow represents harmony with nature and the cyclical beauty of life, which are core themes in Japanese cultural philosophy.



<h2 class="wp-block-heading" id="h-seasons-are-changing-with-the-climate">Seasons are changing with the climate</h2>



<a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fextreme-ocean-heating-signals-alarm-for-a-3c-warmer-world%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">Climate change</a> is shifting the timing and length of seasons worldwide. Rising global temperatures have led to significant changes in seasonal patterns, affecting when plants bloom, animals migrate, and weather patterns stabilize.



<h3 class="wp-block-heading" id="h-temperature-shifts">Temperature shifts</h3>



Warmer global temperatures have contributed to longer and more intense <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fsummers-seasons-warm-faster-than-winters-earths-climate-history%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">summers</a>. For instance, spring arrives earlier in many parts of the world, with evidence showing that plants are budding and blooming sooner than they did several decades ago​​.&nbsp;



This extended warmth shortens winter and affects the typical cycles that ecosystems depend on.



<h3 class="wp-block-heading" id="h-impact-on-ecosystems">Impact on ecosystems</h3>



The shift in seasons can disrupt ecosystems that have evolved to rely on consistent seasonal changes.&nbsp;



For example, migratory <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fbirds-produce-fewer-offspring-as-spring-arrives-earlier-across-our-warming-world%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">birds</a> often time their movements based on day length and food availability. If the seasons shift and food sources appear or disappear earlier than usual, these birds may struggle to adapt. 



Similarly, in agricultural systems, unpredictable frost dates and changing rainy seasons can reduce crop yields and impact food security​​​​.



<h3 class="wp-block-heading" id="h-water-cycles-and-weather-patterns">Water cycles and weather patterns</h3>



Seasonal shifts also affect water availability. Warmer winters with less snow impact water supplies, especially in regions dependent on snowpack for spring and summer water flow. This can lead to drier conditions and exacerbate droughts, as seen in many parts of North America and Asia​​.



Ultimately, the seasonal shifts driven by climate change have far-reaching effects on natural ecosystems, agriculture, and human infrastructure - making climate adaptation an urgent priority.



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Snow returns to Mount Fuji after record absence 

Different markings in species of butterfly fish are used to aid in identification.

Therefore Butterflyfish mostly range from 12 to 22 cm  in length. The<a href="http://www.earth.com/earthpedia-articles/endangered-species/"> largest species</a>,  lined butterflyfish and the saddle butterflyfish, grow to 30 cm.

Therefore the common name references the brightly colored and strikingly patterned bodies of many species, bearing shades of black, white, blue, red, orange, and yellow.

Although species are dull in color. Many have eyespots on their flanks and dark bands across their eyes, not unlike the patterns seen on butterfly wings.

Also the deep, laterally narrow bodies are easily noticed through the profusion of reef life. The conspicuous coloration of butterflyfish may be intended for interspecies communication.

Butterflyfish have uninterrupted dorsal fins with tail fins that may be rounded or truncated, but are never forked.


<a href="http://oceanexplorer.noaa.gov/explorations/02sab/welcome.html" target="_blank" rel="noopener">Exploring Underwater Oases: July 27 - September 1, 2002</a>

Different markings in species of butterfly fish

Antarctic ice often holds secrets waiting to be discovered, and sometimes an unexpected event can reveal them.



This was exactly the case when an autonomous Seaglider, charmingly named Marlin and launched by the <a href="https://www.uea.ac.uk/about/school-of-environmental-sciences" target="_blank" rel="noreferrer noopener">University of East Anglia's School of Environmental Sciences</a>, became unintentionally trapped beneath the vast expanse of the Ross Ice Shelf.



<h2 class="wp-block-heading" id="h-unplanned-path-led-to-unseen-depths">Unplanned path led to unseen depths</h2>



In December 2022, Marlin was launched out over the Ross Sea, programmed to venture north towards open waters, collecting significant data for climate studies on the way.



Contrary to the plan, Marlin ended up embarking on an unscheduled expedition under the <a href="https://www.earth.com/news/mysterious-force-moves-ross-ice-shelf-antarctica-every-day/" target="_blank" rel="noreferrer noopener">Ross Ice Shelf</a>, after being dragged there by a southward-flowing <a href="https://www.earth.com/news/antarctic-circumpolar-current-speed-increasing-rising-sea-levels/" target="_blank" rel="noreferrer noopener">current</a>.



The little voyager was under the ice for four days, during which it conducted 79 deep dives into the cavity beneath the ice shelf and collected water measurements up to 200 meters beneath the surface.



<h2 class="wp-block-heading" id="h-a-surge-of-somewhat-warm-water">A surge of somewhat warm water</h2>



During its unintended sojourn, the sensors onboard Marlin detected a layer of relatively warmer water, about 50 meters thick, that had made its way into the shelf cavity from the open sea. 



The temperature of this water intrusion ranged from -1.9°C to a marginally warmer -1.7°C under the ice.



Its warmth was capable of <a href="https://www.earth.com/news/antarctic-ice-shelves-are-fracturing-from-meltwater-weight/" target="_blank" rel="noreferrer noopener">melting the ice shelf's base</a>, unlike the freezing-point waters that it probably replaced.



<h2 class="wp-block-heading" id="h-long-term-view-on-antarctic-ice-melting">Long-term view on Antarctic ice melting</h2>



The surprise insights from Marlin's stuck-under-the-ice saga led the researchers to re-examine all available measurements from the past four decades. 



The result? Heat transported into the cavity has undoubtedly increased over the past 45 years, largely due to the effects of <a href="https://www.earth.com/news/antarctic-fish-are-increasingly-threatened-by-climate-change/" target="_blank" rel="noreferrer noopener">climate change</a> that has warmed the Ross Sea.



"While the temperature increase - four thousandths of a degree a year - might not seem all that much, it could lead to around 20 to 80 cm of additional ice loss per year over the 45 years we look at," explained Dr. Peter Sheehan, the lead author of the study.



"We found the waters of the intrusion were warm enough to melt the underside of the ice shelf, unlike the freezing-point waters they likely displaced."&nbsp;



"What's new here is that we can track the warm water pretty much from the open water of the Ross Sea at the ice front, back into the cavity. We have not seen one of these intrusions happening directly before."



<h2 class="wp-block-heading" id="h-the-role-of-winds-and-the-rising-concern">The role of winds and the rising concern</h2>



The research further suggested that certain wind patterns could drive warm surface water under the Ross Ice Shelf, leading to a southward flow in the surface ocean and directly into the ice shelf cavity.



These wind-driven, ocean-surface flows, known as Ekman currents, carry heat, effectively increasing the melting rate of the overlying ice.



"It appears reasonable to expect that the magnitude of the Ekman heat flux, and of the melting that it drives, will increase yet further as climate change drives continued <a href="https://www.earth.com/news/ocean-warming-is-subtly-changing-the-tides/" target="_blank" rel="noreferrer noopener">ocean warming</a>. This trend is a concern in itself," said study co-author Professor Karen Heywood.



"The influence of surface-water intrusions, alongside the trends and variability in the Ekman dynamics that can drive these, must be incorporated into climate models, not least given continued uncertainty in the response of Antarctic land-based ice to climate change."



This is particularly relevant as oceans absorb and redistribute a significant proportion of the Earth's heat. This means that changes in this system could have significant impacts on global weather, sea levels, and temperature trends.



<h2 class="wp-block-heading" id="h-continuous-voyage-into-antarctic-ice-dynamics">Continuous voyage into Antarctic ice dynamics</h2>



This is the first time such a comprehensive, multi-decadal data set has been used to study this process. 



Earlier knowledge about surface-water intrusions came from studying hydrography in open water using observations from tagged seals, ship data, and ice moorings deployed inside a cavity.



As we prepare for the future, the chance encounter of Marlin with the Ross Ice Shelf highlights the importance of integrating the influence of surface-water intrusions and Ekman dynamics into climate models.



It also serves as a reminder of our enduring quest to understand the ever-changing dynamics of our precious blue planet.



The study is published in the journal <a href="https://www.science.org/doi/10.1126/sciadv.ado6429" target="_blank" rel="noreferrer noopener">Science Advances</a>.



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



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‘Lost’ seaglider reveals new details about the fate of Antarctic ice

Antarctic ice often holds secrets waiting to be discovered, and...

It appears that kids are not necessarily the champions of learning new skills, contrary to what we've always assumed. In fact, a recent study suggests that young adults outpace children in learning new skills - but there's a catch, they also tend to forget these skills faster.



Children are often seen as superlearners, picking up everything from new languages to cartwheeling or grooving to TikTok dances. 



After all, science has often declared the pre-puberty phase as a "golden age for motor skills learning." But now, a study from the University of Copenhagen calls for a reevaluation.



<h2 class="wp-block-heading" id="h-age-related-differences-in-motor-skill-learning">Age-related differences in motor skill learning </h2>



Our understanding of <a href="https://www.earth.com/news/when-it-comes-to-practice-and-learning-variety-is-key/" target="_blank" rel="noreferrer noopener">learning proficiencies</a> across different age groups has mostly been groundless. 



"There's no actual physiological basis for this so-called golden age," said Jesper Lundbye-Jensen, an associate professor at the <a href="https://www.ku.dk/en" target="_blank" rel="noreferrer noopener">University of Copenhagen</a>'s Department of Nutrition, Exercise, and Sports.



His curiosity prompted him to go deeper into understanding how age-related differences in our central nervous system affect motor skill learning.



In a fascinating study featured in the journal Developmental Science, Professor Lundbye-Jensen's team tested the motor learning skills of 132 participants from four different age groups (8-10, 12-14, 16-18, and 20-30 years).



In a lab setup, the participants were tasked to move a cursor on a computer screen using quick and precise finger movements. Their performance was measured at three stages - baseline, during the training session, and 24 hours later post-training.



<h2 class="wp-block-heading" id="h-learning-curve-across-ages">Learning curve across ages</h2>



Surprisingly, participants who were 16-18 years old and 20-30 years old showed significantly more improvement than the 8-10 year-old group.



Study lead author Mikkel Malling Beck is a former PhD student at the University of Copenhagen who now works as a researcher at the Danish Research Centre for Magnetic Resonance at <a href="https://www.hvidovrehospital.dk" target="_blank" rel="noreferrer noopener">Hvidovre Hospital</a>.



“So, it appears that both teenagers and younger adults are better equipped to quickly acquire <a href="https://www.earth.com/news/young-adult-depression-linked-to-worse-memory-skills/" target="_blank" rel="noreferrer noopener">new skills</a> compared to children, who showed smaller and slower improvements. At least when it comes to short-term learning and motor skills which this study investigated," noted Malling Beck.



<h2 class="wp-block-heading" id="h-mature-cognitive-functioning">Mature cognitive functioning</h2>



What could account for adults learning faster? The research team proposes a few theories. 



For example, adults may derive more from task instructions due to advanced cognitive development and an increased ability to process information.



Or, it's possible that the fully developed nervous system in adults forms a better structure for learning. After all, years of education and learning experiences might render adults as more efficient learners.



<h2 class="wp-block-heading" id="h-role-of-sleep-in-learning">Role of sleep in learning</h2>



The study reveals an interesting dynamic when it comes to retaining what's been learned – children seem to have the upper hand. 



"While the youngest participants actually improve overnight, adults lose some of their <a href="https://www.earth.com/news/toddlers-learn-faster-after-witnessing-impossible-events/" target="_blank" rel="noreferrer noopener">ability to perform</a>," noted Malling Beck.



Could it be that sleep enhances children's learning and memory more? Or, it might be that older individuals - who typically sleep less and have more activities competing for their attention - have less focused memory-consolidation processes.



"Memory-consolidation processes in the nervous system continue for hours after the training ends," noted Professor Lundbye-Jensen.



“When a math class ends, the brain keeps working on what was taught, and in doing so, reinforces memory. Sleep is known to aid consolidation."



"But engaging in other activities in the hours after - especially those that involve learning - can interfere with memory processes and the consolidation of what was just learned."



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



These findings invite educators and policymakers to reevaluate current educational strategies. Traditional views emphasize the early years as a cornerstone for developing essential skills. 



However, this study suggests that educational systems could benefit from <a href="https://www.earth.com/news/memory-isnt-only-stored-in-our-brains-other-cells-can-remember-too/" target="_blank" rel="noreferrer noopener">tailored approaches</a> that leverage the heightened learning capacities of older children and young adults.



Harnessing the potential of cognitive maturity could lead to innovative curricula that align more strategically with the optimal learning windows presented across different ages.



This may include more advanced cognitive tasks for older groups or diversifying skills training throughout adolescence to take full advantage of their learning peaks.



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



The study not only challenges preconceived notions about learning abilities across age groups but also sparks a broader conversation about lifelong <a href="https://www.earth.com/news/sleep-is-essential-for-memory-formation/" target="_blank" rel="noreferrer noopener">learning and adaptability</a>.



Moving forward, research could focus on how cognitive and neurological development continues to influence learning processes beyond early adulthood. 



Furthermore, understanding individual differences in learning speeds and retention could lead to personalized educational tools and techniques. 



Future studies might uncover how environment, lifestyle, and even technology play roles in shaping our learning trajectories well into adulthood. With ongoing research, the promise of more inclusive and effective learning models becomes increasingly attainable.



<h2 class="wp-block-heading" id="h-better-learner-kids-or-adults">Better learner: Kids or adults?</h2>



While the overall learning outcome doesn't show drastic variations across age groups, the learning process itself - influenced by the maturity of the central nervous system - does differ.



“For anyone aiming to improve their skills, it's crucial to structure training so that each individual gets the most out of their time," noted Professor Lundbye-Jensen.



This understanding of age-related differences could well inspire changes in teaching and training methods in fields like sports, music, and even rehabilitation practices.



So, who's truly the better learner - children or adults? Well, it appears both have their unique strengths and weaknesses. Essentially, learning isn't a one-size-fits-all model. Perhaps it's time to reassess our learning strategies based on individual requirements and <a href="https://www.earth.com/news/can-ai-systems-learn-like-the-human-brain/" target="_blank" rel="noreferrer noopener">capabilities</a>.



The study is published in the journal <a href="https://onlinelibrary.wiley.com/doi/10.1111/desc.13536" target="_blank" rel="noreferrer noopener">Developmental Science</a>.



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Adults learn skills faster than children, but there's a catch

It appears that kids are not necessarily the champions of...

Incredibly, trees have their own savvy ways of handling destructive winds during storms and cyclones. But, how do they do it? 



This was the driving question behind a recent study conducted by an international team of researchers from Japan, Germany, and France. The experts explored the fascinating swaying behaviors of Cryptomeria japonica, also known as the Japanese Cedar.



<h2 class="wp-block-heading" id="h-forests-and-wind-stress">Forests and wind stress</h2>



Let's face it - <a href="https://www.earth.com/news/trees-are-relocating-in-a-race-against-global-warming/" target="_blank" rel="noreferrer noopener">extreme weather conditions</a>, which include tropical and extratropical cyclones and tornadoes, are no less than calamities. 



They damage our forests, leading to environmental and financial losses. Fallen trees can disrupt entire ecosystems, and cleaning up the mess is not exactly cheap.



In addition, with climate change on the rise, we can expect increasingly severe storms in the future. With this in mind, it is important that we understand how forests respond to wind stress.



<h2 class="wp-block-heading" id="h-how-trees-react-to-wind">How trees react to wind</h2>



This is not the first time scientists have examined the resilience of trees. However, previous studies have not given us a clear understanding of how trees react to wind across different forest configurations and weather conditions.



Recognizing this knowledge gap, the team embarked on a mission to unravel the mysteries of tree movements and wind resistance.



The research team was led by Professor Kana Kamimura, an expert in the School of Science and Technology at <a href="https://www.shinshu-u.ac.jp/english/" target="_blank" rel="noreferrer noopener">Shinshu University</a>, Japan.



Other team members included Kazuki Nanko, Asako Matsumoto, and Saneyoshi Ueno from the <a href="https://www.ffpri.affrc.go.jp/ffpri/en/index.html" target="_blank" rel="noreferrer noopener">Forestry and Forest Products Research Institute</a> in Japan, and Barry Gardiner from the <a href="https://uni-freiburg.de/en/" target="_blank" rel="noreferrer noopener">University of Freiburg</a> in Germany and the Institut Européen de la Forêt Cultivée- <a href="https://www.plantedforests.org/fr/" target="_blank" rel="noreferrer noopener">IEFC</a>, France.



<h2 class="wp-block-heading" id="h-trees-in-various-wind-conditions">Trees in various wind conditions</h2>



"Several techniques have been developed to predict wind damage. However, they largely depend on empirical data and parameters, and overlook how wind damage occurs," noted Professor Kamimura.



"Our research aims to shed light on how winds directly impact trees and how trees reduce the stress from winds to survive."



For the investigation, the researchers monitored the behavior of trees during various wind conditions.



Their laboratory was the great outdoors, where they set up two Cryptomeria japonica plots in November 2017 in Kasumigaura City, Japan. 



The experts paid special attention to how these trees managed to dodge strong winds, gathering data over two years, including during multiple typhoons.



<h2 class="wp-block-heading" id="h-trees-secret-defense-strategy">Trees' secret defense strategy</h2>



The results of the study were remarkable. The researchers found that cedar trees have two distinct <a href="https://www.earth.com/news/can-trees-protect-their-genetic-diversity-for-millions-of-years/" target="_blank" rel="noreferrer noopener">survival modes</a>, depending on wind speed.



With lighter winds, the trees swayed at around 2-2.3 cycles per second, with their branches absorbing much of the wind energy. But when the winds got rough, the resilient trees switched to a slower swaying pattern, moving together as one unit.



<h2 class="wp-block-heading" id="h-wind-speed-vs-tree-density">Wind speed vs. tree density</h2>



The transition between the two swaying modes was found to depend on the wind speed and also on the forest density. 



The densely populated P-100 plot made the shift at wind speeds between 1.79 and 7.44 meters per second. On the other hand, the transition happened at slightly lower wind speeds in the less dense P-50 plot.



<h2 class="wp-block-heading" id="h-case-of-typhoon-trami">Case of typhoon Trami</h2>



Typhoon Trami, in 2018, offered the team a real-world scenario to test their theories. They found that the thinned P-50 plot, despite its 48% resistance, suffered significant damage. 



“The 52% difference between actual and expected resistance values was likely due to the roots weakening because of strong winds, even before the winds became more severe," noted Professor Kamimura.



"This root fatigue occurred because the trees moved more due to less support from nearby trees and more wind penetrating the plot." 



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



The insights drawn from this study are indeed valuable. They have revealed the crucial balance between thinning practices and wind resistance in <a href="https://www.earth.com/news/more-than-one-third-of-the-worlds-trees-face-extinction/" target="_blank" rel="noreferrer noopener">forest management</a>. 



Thinning, although helpful in promoting tree growth, can make forests more vulnerable to storms, especially soon after the thinning process.



"With more frequent storms in a changing climate, forest management practices must adapt to maintain resilience," concluded Professor Kamimura.



So, as we face a future with more storms, let's stand together, just like our trees, ready to sway but not break in the face of adversity. 



The study is published in the journal <a href="https://www.sciencedirect.com/science/article/abs/pii/S0378112724005358?via%3Dihub" target="_blank" rel="noreferrer noopener">Forest Ecology and Management</a>.



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Trees cleverly adapt to withstand storms and high winds

Incredibly, trees have their own savvy ways of handling destructive...

Sleep experts advise against screen time in bed, cautioning that light from phones and electronic devices can interfere with our natural sleep patterns.&nbsp;



This is one example of how science is becoming more attuned to the wide-ranging health impacts linked to circadian rhythms and our daily sleep-wake cycles.



<h2 class="wp-block-heading" id="h-artificial-light-and-honeybees">Artificial light and honeybees</h2>



Now, a team of researchers led by the <a href="https://ucsd.edu/" target="_blank" rel="noreferrer noopener">University of California, San Diego</a> (UC San Diego) has revealed that <a href="https://www.earth.com/news/artificial-light-pollution-disrupts-entire-ecological-networks/" target="_blank" rel="noreferrer noopener">artificial light</a> also disrupts the circadian rhythms of honeybees, posing a risk to their role as pollinators.&nbsp;



“Our research shows just how sensitive <a href="https://www.earth.com/news/honey-bees-face-a-multitude-of-complex-stressors-in-the-field/" target="_blank" rel="noreferrer noopener">honeybees</a> are to changes in their environment, particularly to something as seemingly benign as artificial light,” said lead author Ashley Kim, a PhD student in biology at UC San Diego.&nbsp;



“By disrupting their circadian rhythms, we see clear evidence of reduced sleep periods. This raises significant concerns, not only for bee health but also for the health of ecosystems that depend on them for pollination.”



<h2 class="wp-block-heading" id="h-night-light-and-sleep-disturbances">Night light and sleep disturbances </h2>



Honeybees are key pollinators for many wild plants and agricultural crops, essential for both ecosystem stability and global food security. These bees typically prefer nesting in dark spaces, though a little light enters from the hive entrance.&nbsp;



When bees are exposed to artificial light at night (ALAN), particularly in urban areas, their <a href="https://www.earth.com/news/australian-dragons-reveal-new-clues-about-the-mysteries-of-sleep/">sleep</a> is disturbed, and as temperatures rise, bees may be even more exposed to ALAN.&nbsp;



The growing popularity of urban beekeeping to support bees and their pollination services means more honeybees may be facing these artificial light challenges.



<h2 class="wp-block-heading" id="h-artificial-light-and-honeybee-behavior">Artificial light and honeybee behavior</h2>



Poor sleep from light exposure impairs bee behaviors crucial for hive health, including their complex communication system called the “<a href="https://www.earth.com/news/bees-perform-waggle-dance-to-share-the-location-of-food/" target="_blank" rel="noreferrer noopener">waggle dance</a>,” which helps bees share information about food sources.&nbsp;



To study this impact, UC San Diego researchers conducted experiments over several years, comparing bees sleeping in darkness with bees exposed to constant light. The results showed that bees in constant light had disrupted sleep, as Kim observed through 24-hour video recordings.



“Even without analyzing the data, you can tell that there was something going on…the bees that were under constant light slept less,” she said.&nbsp;



“The effects of light pollution on biological systems is fairly unknown and something people normally don’t think about, which is why it’s a rapidly evolving field.”



<h2 class="wp-block-heading" id="h-growing-threat-of-light-pollution">Growing threat of light pollution</h2>



“Understanding the factors that affect bee health, such as light pollution, is essential for developing strategies to protect pollinator populations,” said senior author James Nieh, a professor of biology at UC San Diego.&nbsp;



As artificial light now covers over a quarter of the Earth’s surface, the study highlights the urgent need to understand how these disruptions may be harming bees and other pollinators.&nbsp;



Continuous artificial light exposure caused honeybees to sleep less, and their hive-mates disturbed them more frequently compared to bees resting in the dark. In experimental cages, bees under constant light sought darker areas.



<h2 class="wp-block-heading" id="h-enlace-initiative-in-pollinator-research">ENLACE initiative in pollinator research</h2>



This research also highlights UC San Diego’s ENLACE program, which connects students from Latin America and the U.S. to research global challenges like <a href="https://www.earth.com/news/pollen-wars-plants-compete-for-space-on-pollinators/" target="_blank" rel="noreferrer noopener">pollinator</a> health.&nbsp;



Students who participated in the ENLACE initiative, such as Aura Velazquez and Belen Saavedra, contributed as co-authors on the study.&nbsp;



“This project exemplifies the impact of ENLACE, bringing diverse perspectives to address environmental challenges like pollinator health and environmental sustainability,” said Olivia Graeve, ENLACE director and UC San Diego professor.



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



UC San Diego’s Catalyst Fund recently awarded Nieh and study co-author Benjamin Smarr a grant to extend their research on circadian rhythms to broader environmental and human health issues.&nbsp;



Their project, “Harmonizing the Pulse of Life: Pioneering Circadian Insights for Human and Ecosystem Health at UC San Diego,” will explore the effects of circadian disruptions from bees to entire ecosystems.&nbsp;



“This program fosters interdisciplinary collaboration, bringing together experts in biology, data science, and medicine to address issues like light pollution and its impact on pollinator health,” said Nieh.&nbsp;



The Catalyst Grant reinforces UC San Diego’s commitment to sustainability and human well-being, offering innovative ways to mitigate light pollution’s effects on pollinators and beyond.



The study is published in the journal <a href="https://www.nature.com/srep/" target="_blank" rel="noreferrer noopener">Nature Scientific Reports</a>. A preprint can be found on <a href="https://www.biorxiv.org/content/10.1101/2023.07.03.547605v1" target="_blank" rel="noreferrer noopener">BioRxiv</a>.



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Artificial light disrupts honeybee sleep patterns

Sleep experts advise against screen time in bed, cautioning that...

The fossilized remains of a giant "terror bird," recently discovered in the sandy landscapes of South America's Tatacoa Desert, tells the story of a formidable predator from the Phorusrhacid family.



A new study focuses on these giant, meat-eating predators, providing remarkable insights into the diverse wildlife that roamed the world in very ancient times.



<h2 class="wp-block-heading" id="h-what-are-phorusrhacid-s">What are Phorusrhacids?</h2>



Phorusrhacid birds, better known as "terror birds," were some of the most impressive predators to ever walk the Earth. These flightless birds lived in South America from about 60 million to 2 million years ago. 



Standing up to 10 feet tall, they had massive, hooked beaks and really strong legs built for running, Basically, they were the top predators of their time.



Terror birds dominated their environment by hunting small to medium-sized animals. They could sprint at high speeds to chase down prey, using their powerful beaks to deliver lethal strikes. 



Some scientists believe they might have even hunted in packs, although that's still up for debate. Their reign lasted for millions of years, filling the gap left by the dinosaurs' extinction.



<h2 class="wp-block-heading" id="h-leg-bone-of-an-ancient-phorusrhacid">Leg bone of an ancient Phorusrhacid</h2>



At the center of this fascinating narrative is a leg bone. This relic from the <a href="https://www.earth.com/news/fossil-site-in-australia-indicates-abundant-life-during-the-miocene/" target="_blank" rel="noreferrer noopener">Miocene</a> epoch, a period dating back around 12 million years, holds within it stories about the ancient birds of prey that roamed the continent.



Dr. Siobhán Cooke is an associate professor of functional anatomy and evolution at the <a href="https://www.jhu.edu/" target="_blank" rel="noreferrer noopener">Johns Hopkins University</a> School of Medicine. 



He noted that the size of the bone indicates that this terror bird may be the largest known member of the species identified to date, approximately 5 to 20 percent larger than known Phorusrhacids.



The bone's physical attributes provide an intriguing subplot. It contains deep pits peculiar to Phorusrhacids and potential teeth marks of a prehistoric caiman, Purussaurus.



The physical evidence seems to point to a fatal altercation with a <a href="https://www.earth.com/news/differences-in-the-mammalian-and-reptilian-brain-revealed/" target="_blank" rel="noreferrer noopener">reptilian</a> adversary. 



"We suspect that the terror bird would have died as a result of its injuries given the size of <a href="https://www.earth.com/news/ancient-remains-shed-new-light-on-crocodilian-evolution/" target="_blank" rel="noreferrer noopener">crocodilians</a> 12 million years ago," said Dr. Cooke.



<h2 class="wp-block-heading" id="h-distribution-of-phorusrhacid-terror-birds">Distribution of Phorusrhacid terror birds</h2>



The unearthed fossil, found as far north as Colombia, expands our understanding of the geography of terror birds, which have been primarily associated with Argentina and Uruguay.



The research hints at a diverse and thriving ecosystem, markedly different from the landscapes we see now.



This ancient environment, now a desert, was home to <a href="https://www.earth.com/news/primates-face-an-uncertain-future-due-to-climate-change/" target="_blank" rel="noreferrer noopener">primates</a>, hoofed mammals, gigantic ground sloths, glyptodonts (essentially, gigantic armadillos the size of cars), and terror birds.



The seriema, a modern long-legged bird native to South America, is considered a distant relative of Phorusrhacids.



"It’s a different kind of ecosystem than we see today or in other parts of the world during a period before South and North America were connected," noted Dr. Cooke.



<h2 class="wp-block-heading" id="h-studying-phorusrhacid-terror-birds">Studying Phorusrhacid terror birds</h2>



The discovery opens a window of possibility that additional fossils of terror birds may lie unidentified in museum archives.



"It’s possible there are fossils in existing collections that haven’t been recognized yet as terror birds because the bones are less diagnostic than the lower leg bone we found," said Dr. Cooke.



The fossil also prompts us to envision an environment now lost to time, populated by <a href="https://www.earth.com/news/elusive-bird-night-parrot-pezoporus-occidentalis-thought-to-be-long-extinct-rediscovered/" target="_blank" rel="noreferrer noopener">long-extinct</a> creatures that once dominated the fauna. 



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/11/terror-bird_Phorusrhacid_leg-bone_tibiotarsus_credit-Degrange_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/11/terror-bird_Phorusrhacid_leg-bone_tibiotarsus_credit-Degrange_1s.webp" alt="The end of a terror bird's left tibiotarsus, a lower leg bone in birds equivalent to that of a human tibia or shin bone, dates back to the Miocene epoch around 12 million years ago. Credit: Degrange et al." class="wp-image-1949728"/></a><figcaption class="wp-element-caption">The end of a terror bird's left tibiotarsus, a lower leg bone in birds equivalent to that of a human tibia or shin bone, dates back to the Miocene epoch around 12 million years ago. Credit: Degrange et al.</figcaption></figure>



"It would have been a fascinating place to walk around and see all of these now extinct animals," noted Dr. Cooke.



This remarkable find, the first of its kind from the site, is a tribute to the rich biodiversity that once adorned our planet. 



It nudges us to view the past through a lens of awe and curiosity, and to appreciate the diversity and beauty of the life forms that populated Earth millions of years ago.



<h2 class="wp-block-heading" id="h-the-terror-bird-s-legacy">The terror bird’s legacy</h2>



The discovery of this massive terror bird sheds light not only on ancient ecosystems but also on the evolutionary story of apex predators. 



The physical characteristics of this bird - its powerful leg bones and sharp beak -- highlight the specialized adaptations that allowed it to thrive in its environment.



These adaptations may have provided the terror bird with the speed and agility to hunt effectively, filling a predatory role in the food chain much like large cats or raptors do today. 



By understanding the terror bird’s evolution, researchers hope to uncover insights into how apex predators adapt to environmental shifts, contributing valuable knowledge to evolutionary biology.



<h2 class="wp-block-heading" id="h-fossil-discoveries-on-the-horizon">Fossil discoveries on the horizon</h2>



This fossil, potentially one of the largest known of its kind, also serves as a reminder that more discoveries await in the Tatacoa Desert and beyond.



While Colombia is not typically recognized as a hotbed of fossil discovery compared to regions like Argentina or North America, recent findings like this highlight its hidden potential.



Paleontologists are hopeful that ongoing exploration of South American sites will yield further specimens, expanding our understanding of Miocene-era ecosystems. 



This research, along with improved fossil identification techniques, may pave the way for unearthing additional terror bird remains, helping scientists reconstruct the behaviors, habitats, and interactions of these ancient predators.



The study is published in the journal <a href="https://onlinelibrary.wiley.com/doi/epdf/10.1002/spp2.1601" target="_blank" rel="noreferrer noopener">Palaeontology</a>.



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"Terror birds" ate meat and dominated the planet long ago

The fossilized remains of a giant "terror bird," recently discovered...

It's known as the "boring billion," a murky period in Earth's history between 1.8 billion and 800 million years ago, when life's complexity didn't extend much beyond single-celled organisms.



Apart from the occasional multicellular life form, most of the living species during that time period were simple, unicellular organisms that had minimal requirements for life. 



But don't mistake "boring" for insignificant. This epoch of evolution laid the foundation for the drama of complex multicellularity that would eventually lead to us.



<h2 class="wp-block-heading" id="h-energy-fuel-for-evolution">Energy: Fuel for evolution</h2>



The boring billion period appears to mark a time when the evolution of complex life was delayed and conditions were so stable as to border on stagnant. 



Scientists state that oxygen levels at this time were drastically decreased and conditions were fairly harsh for most forms of life.



A new study by Michael Lynch of <a href="https://www.asu.edu/" target="_blank" rel="noreferrer noopener">Arizona State University</a> has revealed that the transition from unicellular to multicellular life forms would have come at a cost.



Using the water flea, Daphnia, as a <a href="https://phys.org/tags/model+organism/">model organism</a>, the study shows that multicellular organisms require more than a tenfold increase in energy compared with the simpler, unicellular organisms characteristic of the boring billion period. 



"No one doubts that multicellularity can bring substantial advantages to the table, but the privilege of attaining such benefits comes at a steep investment cost," said Lynch, who directs the <a href="https://search.app?link=https%3A%2F%2Fbiodesign.asu.edu%2Fmechanisms-of-evolution%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">Biodesign Center for Mechanisms of Evolution</a> at ASU.



The study emphasizes the importance of respiration and other metabolic processes in navigating the transition to more complex life forms. 



<h2 class="wp-block-heading" id="h-cost-of-complexity">Cost of complexity </h2>



Every organism, from the smallest bacterium to a human, is driven by energy. Having an entire body made of only one cell reduces the need for energy and nutrients to grow and reproduce. 



But multicellular organisms, like plants, animals, and fungi, have to maintain a multitude of cells in complex tissues, organs and structures. And this places a far higher energy demand on the organism.



As the cell count increases in a <a href="https://www.earth.com/news/how-life-and-environment-co-evolved-over-500-million-years/" target="_blank" rel="noreferrer noopener">multicellular organism</a>, so does the demand on ATP synthase, the molecular machinery in cells that manufactures ATP, the universal energy currency. 



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/11/multicelled-organisms_metazoan-daphnia_credit-Marek-Mis_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/11/multicelled-organisms_metazoan-daphnia_credit-Marek-Mis_1s.webp" alt="A new study shows that multicelled organisms like the metazoan daphnia (pictured) require a tenfold increase in energy compared with protists for their growth, maintenance and survival. The high cost of multicellular existence is offset by the many evolutionary advantages afforded to advanced organisms, from simpler forms like daphnia all the way up to vertebrate species, including humans. Credit: Marek Miś" class="wp-image-1950209"/></a><figcaption class="wp-element-caption">A new study shows that multicelled organisms like the metazoan daphnia (pictured) require a tenfold increase in energy compared with protists for their growth, maintenance and survival. The high cost of multicellular existence is offset by the many evolutionary advantages afforded to advanced organisms, from simpler forms like daphnia all the way up to vertebrate species, including humans. Credit: Marek Miś</figcaption></figure>



Each new cell in a multicellular body is another mouth to feed in terms of energy, and the cost increases with the number of cells.



The findings of the Daphnia study show that metazoans - the group that includes multicellular creatures - need a lot more ATP synthase complexes in each cell than their simpler, unicellular counterparts.



In fact, for every increment in body mass, these organisms require 30 to 50 times more oxygen than simpler, unicellular creatures. This additional oxygen supports the complex needs for metabolism, cellular communication, and tissue maintenance.



<h2 class="wp-block-heading" id="h-size-comes-at-a-price">Size comes at a price</h2>



Growth isn't cheap, particularly for multicellular organisms. 



While larger, unicellular organisms, like some amoebas, become more efficient as they grow, multicellular organisms face unique challenges that require extra energy to sustain their larger sizes and more complex structures.



Given this steep energy price, why did multicellularity evolve at all? 



The answer seems to be that multicellular life offers evolutionary advantages, such as being able to consume unicellular organisms en masse, evade predators, and live in various environments.



<h2 class="wp-block-heading" id="h-overcoming-energy-barriers">Overcoming energy barriers</h2>



To surmount the energetic challenges presented by <a href="https://www.earth.com/news/past-snowball-earth-conditions-drove-evolution-complex-multicellular-life/" target="_blank" rel="noreferrer noopener">multicellularity</a>, organisms have developed remarkable adaptations to utilize their resources efficiently. 



One key adaptation is the division of labor between specialized cells, tissues, and organs; this specialization allows for optimized energy usage where cells perform distinct functions more efficiently than they would if they had to carry out all the different life activities.



For example, mitochondria within eukaryotic cells have evolved highly efficient pathways to generate ATP, thus maximizing the energy harvested from different substrates.



Furthermore, the development of vascular systems in plants and circulatory systems in animals allows for the effective distribution of energy resources, and ensures that all cells have access to the oxygen and nutrients necessary to produce energy.



<h2 class="wp-block-heading" id="h-implications-of-the-boring-billion">Implications of the "boring billion"</h2>



Understanding the evolutionary narrative of the "boring billion" holds powerful implications for modern scientific research. 



This era not only reflects the energy-centric challenges of the past but also informs the fields of synthetic biology, evolutionary biology, and bioengineering.



By studying the metabolic pathways and energy efficiencies developed during this period, researchers can potentially design bio-inspired systems and organisms with enhanced functionalities and sustainability.



Furthermore, insights gained from this epoch's evolutionary innovations could pioneer future advancements in medical therapies, agriculture, and ecosystem management. 



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



This study primarily focuses on aerobic, animal-like organisms. But there's a vast and varied spectrum of life out there, including plants and fungi, and the researchers plan to extend their investigations to these life forms. 



Future insights could shed light on why <a href="https://www.earth.com/news/biggest-known-space-cloud-of-life-building-complex-chemicals-discovered/" target="_blank" rel="noreferrer noopener">multicellular life forms</a> took a considerable time to appear and diversify on our planet.



Multicellular life has high energy demands and this study suggests that the constraints of bioenergy could be a universal phenomenon that is applicable to any carbon-based, oxygen-breathing life, no matter where it exists in the universe.



The study is published in the journal <a href="https://www.pnas.org/doi/10.1073/pnas.2414742121" target="_blank" rel="noreferrer noopener">Proceedings of the National Academy of Sciences</a>.



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'Boring billion' wasn’t a dull period, it fueled a shift to complex life

It's known as the "boring billion," a murky period in...

Lightning,Thunderstorm,Flash,In,The,Mountains.,Concept,On,Topic,Weather,

Imagine a world where continents are fused into one massive landmass, and life as we know it is on the brink of transformation. That's precisely what happened 233 million years ago during one million year period of rain called the Carnian Pluvial Episode (CPE).



An international team of scientists has found evidence of this significant extinction event, which appears to have paved the way for dinosaurs to become the dominant creatures on Earth.



Involved in this important research are Dr. Jacopo Dal Corso from the <a href="https://en.cug.edu.cn/" target="_blank" rel="noreferrer noopener">China University of Geosciences</a> at Wuhan and Professor Mike Benton from the <a href="https://www.bristol.ac.uk/" target="_blank" rel="noreferrer noopener">University of Bristol</a>. 



Their collaborative efforts have pieced together a pivotal moment in our planet's history that reshaped life both on land and in the oceans.



<h2 class="wp-block-heading" id="h-carnian-pluvial-episode">Carnian Pluvial Episode</h2>



Back in the <a href="https://www.earth.com/news/early-dinosaurs-benefited-from-changes-in-global-climate/" target="_blank" rel="noreferrer noopener">Late Triassic period</a>, all the continents were joined together in a supercontinent known as Pangea, surrounded by the vast Panthalassa Ocean. The interior of <a href="https://www.earth.com/earthpedia-articles/supercontinents-101-pannotia-gondwana-and-pangea/" target="_blank" rel="noreferrer noopener">Pangea</a> was mostly dry and arid, with rainfall occurring mainly near the coastal regions. 



This dry spell took a dramatic turn when a layer of dark gray rock was discovered in Austria's Northern Limestone Alps in the 1970s by geologists Schlager and Schollnberger. 



This layer indicated wet conditions sandwiched between arid periods, suggesting a global climate event -- the Carnian Pluvial Episode.



So, what caused this sudden shift to a wetter climate? The main culprit appears to be massive volcanic eruptions in the Wrangellia Province, an area that now includes parts of Alaska and British Columbia. 



These eruptions released enormous amounts of <a href="https://www.earth.com/news/jurassic-rocks-reveal-new-details-about-earths-climate-system/" target="_blank" rel="noreferrer noopener">carbon dioxide</a> into the atmosphere. 



"The eruptions peaked in the Carnian," notes Dr. Jacopo Dal Corso. "They were so huge, they pumped vast amounts of greenhouse gases like carbon dioxide, leading to spikes of global warming."



<h2 class="wp-block-heading" id="h-mass-extinction-and-new-beginnings">Mass extinction and new beginnings</h2>



The surge in <a href="https://www.earth.com/news/report-earth-is-headed-for-an-irreversible-climate-disaster/" target="_blank" rel="noreferrer noopener">greenhouse gases</a> caused global temperatures to rise by about 5 to 7 degrees Fahrenheit, amplifying evaporation from the seas and triggering increased rainfall worldwide. 



This climate chaos led to significant biodiversity loss. Many species couldn't adapt to the rapid environmental changes, resulting in a mass extinction event. But nature abhors a vacuum. 



As some species disappeared, new ones emerged to fill the gaps, leading to ecosystems that began to resemble those we see today.



"The new floras probably provided slim pickings for the surviving <a href="https://www.earth.com/news/animals-with-high-body-temperatures-often-become-herbivores/" target="_blank" rel="noreferrer noopener">herbivorous reptiles</a>," says Professor Mike Benton. 



"We now know that dinosaurs originated some 20 million years before this event, but they remained quite rare and unimportant until the Carnian Pluvial Episode hit. It was the sudden arid conditions after the humid episode that gave dinosaurs their chance."



<h2 class="wp-block-heading" id="h-dinosaurs-emerge-from-the-carnian-pluvial">Dinosaurs emerge from the Carnian Pluvial</h2>



As the climate shifted back to drier conditions, dinosaurs seized the opportunity to thrive. This period also saw the rise of the first turtles, crocodiles, lizards, and even the <a href="https://www.earth.com/news/incredible-discovery-some-mammals-attacked-dinosaurs-and-they-often-won-the-battle/" target="_blank" rel="noreferrer noopener">earliest mammals</a>. 



The expansion of conifer forests created new habitats, and these emerging animal groups diversified life on land in remarkable ways.



The oceans weren't spared from the upheaval. The Carnian Pluvial Episode marks the beginning of <a href="https://www.earth.com/news/can-we-save-coral-reefs-with-selective-breeding/" target="_blank" rel="noreferrer noopener">modern coral reefs</a> and the appearance of many groups of plankton. 



These changes indicate significant shifts in ocean chemistry and the carbonate cycle, affecting the entire marine food chain and leading to new forms of marine life.



<h2 class="wp-block-heading" id="h-recognizing-a-sixth-mass-extinction">Recognizing a sixth mass extinction</h2>



Until now, scientists had identified five <a href="https://www.earth.com/news/what-was-the-cause-of-earths-largest-mass-extinction/" target="_blank" rel="noreferrer noopener">major mass extinctions</a> over the past half-billion years. These events dramatically reshaped life's trajectory on Earth. 



"So far, paleontologists had identified five 'big' mass extinctions in the past 500 million years of the history of life," says Dr. Dal Corso. 



"We have identified another great extinction event, and it evidently had a major role in helping to reset life on land and in the oceans, marking the origins of modern ecosystems."



<h2 class="wp-block-heading" id="h-lessons-from-this-carnian-pluvial">Lessons from this Carnian Pluvial</h2>



The Carnian Pluvial Episode offers valuable insights into how massive volcanic eruptions and the resulting climate shifts can have far-reaching consequences. 



The release of greenhouse gases like carbon dioxide led to global warming, increased rainfall, and environmental upheaval. 



In our current era, human activities are raising <a href="https://www.earth.com/news/2023-climate-change-report-record-high-temperatures-greenhouse-gases-sea-level-rise/" target="_blank" rel="noreferrer noopener">greenhouse gas levels</a>, leading to climate change. Studying events like the CPE can help us understand how ecosystems respond to rapid environmental changes.



<h2 class="wp-block-heading" id="h-massive-volcanic-events">Massive volcanic events</h2>



Dr. Dal Corso emphasizes the scale of these ancient volcanic events, saying, "The eruptions were so huge, they pumped vast amounts of greenhouse gases like carbon dioxide, and there were spikes of global warming." 



His observations highlight how natural events can dramatically alter our planet's climate.



"I had noted a floral switch and ecological catastrophe among the herbivores back in 1983 when I completed my PhD," Professor Benton notes.



His decades of work illustrate how scientific understanding evolves, building on clues from various fields to piece together Earth's complex history.



Learning about events from millions of years ago requires collaboration across multiple scientific disciplines, including geology, paleontology, and climate science. 



Discoveries like the Carnian Pluvial Episode showcase the importance of interdisciplinary research in deepening our understanding of Earth's past.



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



As we face our own environmental challenges today, looking back at events like the Carnian Pluvial Episode can inform our actions. 



If natural volcanic activity could cause such drastic changes, it raises questions about the impact of human-induced climate change. 



How might life on Earth adapt -- or struggle to adapt -- in the face of current environmental shifts?



The story of the Carnian Pluvial Episode demonstrates Earth's resilience and ability to recover and evolve after catastrophic events. 



A period of massive volcanic eruptions and climate upheaval set the stage for the rise of dinosaurs and the formation of ecosystems that continue to influence life today. 



As we continue to explore our planet's history, each discovery offers a new perspective on the resilience and adaptability of life on Earth.



The full study was published in the journal <a href="https://www.pnas.org/doi/full/10.1073/pnas.2109895118" target="_blank" rel="noreferrer noopener">PNAS</a>.



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One million straight years of rain triggered the dinosaur takeover of Earth

Imagine a world where continents are fused into one massive...

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



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



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



Video/ Image Credit: ESA



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

Nushagak Bay in southwest Alaska

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



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



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



Video/ Image Credit: American Chemical Society&nbsp;



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



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

Flu viruses are more flexible than expected

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

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



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



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



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



Video/Image Credit: ESA&nbsp;



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

Lake Trasimeno in Central Italy

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



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



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



Video Credit: American Chemical Society&nbsp;



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



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

Detecting mercury contamination with the tap of a finger

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Kainji Lake, a reservoir on the Niger River.



In 1968, Kainji Lake was created by the construction of the Kainji Dam. The Niger River, the third longest in Africa, enters the lake in the north.&nbsp;



According to <a href="https://www.earth.com/news/rivers-in-the-american-west-are-a-lifesaving-resource-for-birds/">ESA</a>, the creation of the lake submerged Foge Island and the town of Bussa and permanently flooded other riverine settlements, leaving around 50,000 people displaced.&nbsp;



Large parts of Foge Island are temporarily exposed during low water tides, and the land is often used by migrating fishermen. Kainji Dam is a dam across the Niger River in Niger State of Central Nigeria. 



Wild mammals occur at relatively low densities due to illegal hunting. Lake Kainji has suffered a dramatic decline as a fishery due to the high numbers of artisanal and subsistence fisherfolk using the lake. It has been suggested that a period of closure, together with controlled fishing rights may help improve fish stocks.



Kainji Lake National Park is the oldest of its kind in Nigeria. The park contains three distinct areas: a part of the Kainji Lake, the Borgu Game Reserve to the west of the lake, and the Zugurma Game Reserve to the southeast. The park is home to around 65 mammal species, 350 bird species, and 30 species of reptiles and amphibians. 



Video/ Image Credit: European Space Agency&nbsp;



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



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

Kainji Lake in north central Nigeria

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Today’s Video of the Day from <a href="https://www.igb.illinois.edu/">Carl R. Woese Institute for Genomic Biology</a> reveals how scientists can modify common crops like soybean, rice, and wheat to protect them from heat stress.



“We need to double crop production by 2050 to feed a growing global population, and not only are we not on track to do that, but climate change is further complicating things,” said Amanda Cavanagh, a lecturer at the University of Essex. 



The study is part of Realizing Increased Photosynthetic Efficiency (RIPE), an international research project that aims to develop food crops that turn the sun’s energy into food more efficiently.



“Using an engineering approach we designed multiple alternative metabolic pathways to photorespiration. Testing them in the field showed increases in productivity which led Amanda to significantly move the project forward by showing our engineered plants can withstand pretty extreme temperature stress,” said study co-author and RIPE researcher Paul South.&nbsp;



“As the climate changes and temperature stresses increase the pressure on our global food supply, farmers will need every tool available including engineering approaches like the synthetic biology used here to maintain safe and productive harvests.”



The experts tested plants modified to have more efficient photorespiration to see if they were better adapted to warmer temperatures.&nbsp;



The team found that the engineered plants produced 26 percent more biomass than the wild-type plants exposed to the same temperatures, and had 15 percent less yield loss under the higher temperatures.



Video Credit: Amanda Nguyen/University of Illinois



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



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

Designing crops that can beat the heat

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Examples of coney grouper exhibiting different color variations.
Also the Coney Grouper is a stunning large red grouper. Coney <a href="https://www.earth.com/image/scamp-groupers/">Groupers</a> have a red body with white spots covering the majority of its body.
Some specimens have the lower half of their body completely covered in white. Coney Groupers can reach a maximum size of 16 inches, so they are required to be housed in an aquarium of at least 240 gallons.
Coney Groupers get along well with most larger fish and can be an interesting addition to larger tanks. They car carnivores and require a diet rich in meaty foods to thrive. Food such as frozen krill, squid, feeder fish and fresh seafood are great for Coney Groupers.
<a href="http://oceanexplorer.noaa.gov/explorations/02sab/welcome.html" target="_blank" rel="noopener">Exploring Underwater Oases: July 27 &#8211; September 1, 2002</a>

Coney grouper exhibiting different color variations

While it can swim, this bottom dwelling fish moves across ocean floor.

Bottom dwelling fish live and feed on or near the bottom of seas or lakes (the demersal zone).

Also they occupy the sea floors and lake beds, which usually consist of mud, sand, gravel or rocks.

Therefore coastal waters they are found on or near the <a href="http://www.earth.com/image/ocean-crossroads/">continental shelf</a>, and in deep waters they are found on or near the continental slope or along the continental rise.

They are not generally found in the deepest waters, such as abyssal depths or on the abyssal plain, but they can be found around seamounts and islands. The word demersal comes from the Latin demergere, which means to sink.

Demersal fish are bottom feeders. They can be contrasted with pelagic fish which live and feed away from the bottom in the open water column. Demersal fish fillets contain little fish oil (one to four percent), whereas pelagic fish can contain up to 30 percent.

As with other bottom feeders, a mechanism to deal with substrate is often necessary. With demersal fish the sand is usually pumped out of the mouth through the gill slit.Benthic fish, sometimes called ground fish, are denser than water, so they can rest on the sea floor.

This bottom dwelling fish moves across ocean floor are an order of ray-finned benthic fishes which lie flat on the ocean floor. Examples are flounder, sole, turbot, plaice, and halibut. The adult fish of many species have both eyes on one side of the head. When the fish hatches, one eye is located on each side of its head.

<a href="http://oceanexplorer.noaa.gov/explorations/02sab/welcome.html" target="_blank" rel="noopener">Exploring Underwater Oases: July 27 - September 1, 2002</a>