Wild hog in the Namib desert in Namibia Photo Credit: Photofex-AUT

Wild Hog

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...

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 

Today's Image of the Day from the European Space Agency features Messier 78 (M78), a reflection nebula located in the constellation Orion about 1,350 light-years away from Earth. 



This image was released as part of the initial series of observations from ESA's <a href="https://www.esa.int/Science_Exploration/Space_Science/Euclid" target="_blank" rel="noreferrer noopener">Euclid space mission</a>.&nbsp;



All data collected during these early observations, including a series of incredible <a href="https://www.esa.int/Science_Exploration/Space_Science/Euclid/Euclid_s_first_images_the_dazzling_edge_of_darkness" target="_blank" rel="noreferrer noopener">new views</a> of the nearby universe, is available to the public. 



<h2 class="wp-block-heading" id="h-image-of-messier-78">Image of Messier 78</h2>



Featured here is a high-resolution, detailed segment of a larger image showcasing Messier 78, a dynamic region of star formation obscured by cosmic dust.&nbsp;



This specific view highlights how young stars generate winds of charged particles, carving out “cavities” in the molecular clouds around them.&nbsp;



The blue hues in the image represent ionized atomic hydrogen, which is a primary component of the cloud, while the red indicates the absorption and scattering of light by dust particles.



The image captures hundreds of stars varying in brightness, illuminating their nebulous, purple surroundings. A dark, arch-like structure stretches from the upper left to the bottom right of the frame, merging into the densest, darkest clouds at the image’s base.



<h2 class="wp-block-heading" id="h-active-site-of-star-formation-nbsp">Active site of star formation&nbsp;</h2>



Messier 78 is not just a single nebula but part of a larger complex of stars and nebulous regions in <a href="https://www.earth.com/news/orion-nebula-destroys-an-oceans-worth-of-water-every-month/" target="_blank" rel="noreferrer noopener">Orion</a>, which includes various other objects like dark nebulae that are visible as patches blocking light from behind.



This region is an active site of star formation, featuring many young stars and protostars, which are stars in the early stages of formation.&nbsp;



<h2 class="wp-block-heading" id="h-viewing-messier-78">Viewing Messier 78</h2>



M78 is easily observable with small telescopes, and it appears as a hazy patch of light with two prominent stars near its center, which illuminate the surrounding dust.&nbsp;



The nebula is also a favorite among amateur astronomers for its beauty and relatively bright appearance.



<h2 class="wp-block-heading" id="h-subject-of-scientific-interest-nbsp">Subject of scientific interest&nbsp;</h2>



Messier 78 is fascinating not only for its visual beauty but also for its scientific interest, particularly in the study of <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> and interstellar matter.&nbsp;



The nebula consists of dense, cold gas and dust, which are essential ingredients for the birth of new stars.&nbsp;



The intense blue light that characterizes M78 is due to the reflection of starlight off these dust particles, a process known as scattering.



<h2 class="wp-block-heading" id="h-region-surrounding-messier-78-nbsp">Region surrounding Messier 78&nbsp;</h2>



The region surrounding M78 includes several other interesting features. For instance, there are Herbig-Haro objects within it, which are small patches of nebulosity associated with <a href="https://www.earth.com/news/new-molecule-detected-in-space-where-stars-are-born/" target="_blank" rel="noreferrer noopener">newly born stars</a>.&nbsp;



These objects are formed when gas ejected by young stars collides with clouds of gas and dust at high speeds, creating shock waves that glow brightly.



<h2 class="wp-block-heading" id="h-earliest-stages-of-star-development-nbsp">Earliest stages of star development&nbsp;</h2>



Additionally, infrared observations of M78 have revealed much about the dust and colder objects in the area, which are not visible in optical light.&nbsp;



The observations have helped astronomers identify numerous young stars and brown dwarfs (objects that are too large to be planets and too small to be stars) within the nebula. 



This makes M78 a critical area for studying the earliest stages of star development and the properties of the interstellar medium.



<h2 class="wp-block-heading" id="h-euclid-space-mission-nbsp-0">Euclid space mission&nbsp;</h2>



The <a href="https://www.earth.com/news/new-batch-of-brilliant-images-from-the-euclid-mission-live-up-to-the-hype/" target="_blank" rel="noreferrer noopener">Euclid space mission</a> is a European Space Agency (ESA) mission designed to study the dark universe, particularly focusing on dark energy and dark matter, which are fundamental components that are believed to drive the accelerating expansion of the universe and shape its large-scale structure.&nbsp;



The mission aims to map the geometry of the dark universe and better understand the physics of the cosmos.



<h3 class="wp-block-heading" id="h-observing-billions-of-galaxies-nbsp">Observing billions of galaxies&nbsp;</h3>



Euclid uses two primary scientific instruments: a visible light camera (VIS) and a near-infrared spectrometer and photometer (NISP).&nbsp;



These instruments will allow Euclid to measure the shapes and redshifts of galaxies at distances of up to 10 billion light-years. By surveying more than a third of the sky, the mission is expected to observe several billion galaxies.



<h3 class="wp-block-heading" id="h-studying-the-dark-universe-nbsp">Studying the dark universe&nbsp;</h3>



The data collected will help astronomers in studying the effects of dark matter and dark energy in depth, testing cosmological models, and exploring new theories about the nature of the universe.&nbsp;



The mission, named after the ancient Greek mathematician Euclid, seeks to address key questions related to the structure of the universe and the fundamental laws of physics governing its evolution and expansion.



Image Credit: European Space Agency&nbsp;



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Messier 78: Young stars shine through dense dust

Today's Image of the Day from the European Space Agency features the Cat's Eye Nebula (NGC 6543), located about 3,300 light-years from Earth in the constellation Draco.&nbsp;



The nebula's name comes from its eye-like appearance when viewed through a telescope. This particular image, which reveals the <a href="https://www.earth.com/news/horsehead-nebula-webb-telescope-captured-unprecedented-detail/" target="_blank" rel="noreferrer noopener">nebula</a> in stunning detail, was captured by the NASA/ESA Hubble Space Telescope.



<h2 class="wp-block-heading" id="h-planetary-nebulae-nbsp">Planetary nebulae&nbsp;</h2>



According to ESA, the Cat's Eye Nebula is one of the most complex planetary nebulae that has ever been discovered.



“A planetary nebula forms when Sun-like stars gently eject their outer gaseous layers to form bright nebulae with amazing twisted shapes," explained <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



"Until recently, it was thought that shells around planetary nebulae were a rare phenomenon. However, astronomers have instead shown that these rings are likely to be the rule rather than the exception."



<h2 class="wp-block-heading" id="h-appearance-of-the-cat-s-eye-nebula-nbsp">Appearance of the Cat's Eye Nebula&nbsp;</h2>



The central focus of the Cat's Eye is a hot, dying star that has shed its outer layers to form the <a href="https://www.earth.com/news/dragons-egg-nebula-is-a-truly-stunning-sight-to-behold/" target="_blank" rel="noreferrer noopener">nebula</a>. It is surrounded by concentric gas shells, jets of high-speed gas, and unusual shock-induced knots of gas.



“Although the rings may be the key to explaining the final ‘gasp’ of the dying central star, the mystery behind the Cat’s Eye Nebula’s nested ‘Russian doll’ structure remains largely unsolved,” noted ESA.



<h2 class="wp-block-heading" id="h-rings-around-the-cat-s-eye">Rings around the Cat’s Eye</h2>



“This image, taken with Hubble's Advanced Camera for Surveys (ACS), reveals the full pattern of eleven or more concentric rings, or shells, around the Cat’s Eye. Each ‘ring’ is actually the edge of a spherical bubble seen projected onto the sky - which is why it appears bright along its outer edge.”



According to ESA, observations suggest that the star ejected its mass in a series of pulses at 1,500-year intervals. “These convulsions created dust shells that each contains as much mass as all of the planets in our solar system combined.”



Several explanations have been proposed for this phenomenon, including cycles of magnetic activity similar to our Sun's sunspot cycle, the influence of companion stars orbiting the <a href="https://www.earth.com/news/dying-stars-may-be-a-source-of-gravitational-waves/" target="_blank" rel="noreferrer noopener">dying star</a>, or stellar pulsations.&nbsp;



Another theory suggests that the material is ejected smoothly from the star, with the rings forming later due to the creation of waves in the outflowing material.



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



<a href="https://www.earth.com/news/extrasolar-ocean-planet-discovered-in-the-draco-constellation/" target="_blank" rel="noreferrer noopener">Draco</a> is a constellation in the northern sky that represents a dragon. It's one of the largest constellations, winding between the Big and Little Dippers.&nbsp;



In Greek mythology, Draco is often identified as the dragon Ladon, who guarded the golden apples in the garden of the Hesperides.



Draco is a circumpolar constellation for most northern hemisphere observers, meaning it never sets below the horizon and can be seen all year round.



<h2 class="wp-block-heading" id="h-famous-planetary-nebulae">Famous planetary nebulae </h2>



Planetary nebulae are some of the most beautiful and intriguing objects in the universe.&nbsp;



One of the most famous is the Ring Nebula, or M57, located in the constellation Lyra. This nebula is renowned for its nearly perfect ring shape, which is the result of a dying star shedding its outer layers.&nbsp;



Another well-known planetary nebula is the Helix Nebula, or NGC 7293, often referred to as the "Eye of God" due to its eye-like appearance. The Helix Nebula is one of the closest planetary nebulae to Earth, making it a popular target for amateur astronomers.&nbsp;



The Dumbbell Nebula, or M27, in the constellation Vulpecula, is another striking example. It is named for its resemblance to a dumbbell and is notable for being the first planetary nebula ever discovered, by Charles Messier in 1764.&nbsp;



The Butterfly Nebula, or NGC 6302, is located in the constellation Scorpius. Its name comes from its distinctive bipolar structure, resembling the wings of a butterfly. The nebula's central star is one of the hottest known, with a surface temperature of around 250,000 degrees Celsius.&nbsp;



The Eskimo Nebula, or NGC 2392, in the constellation Gemini, is known for its resemblance to a face surrounded by a fur parka, which gives it its name. Its intricate structure, including filaments and bubble-like shapes, makes it a fascinating object of study. 



These nebulae not only captivate us with their beauty but also provide valuable insights into the life cycles of stars and the processes that shape our galaxy.



Image Credit: NASA/ESA Hubble Space Telescope



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Cat's Eye Nebula in the constellation Draco

Today's Image of the Day from the European Space Agency features the barred spiral galaxy NGC 3783, which is located about 130 million light-years away in the constellation Centaurus. NGC 3783 is also the most prominent of a galaxy group (by the same name) that contains 47 galaxies. 



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



“Like galaxy clusters, galaxy groups are aggregates of gravitationally bound galaxies. Galaxy groups, however, are less massive and contain fewer members than <a href="https://www.earth.com/news/titanic-galaxy-cluster-collision-defies-all-current-understanding-of-the-universe/" target="_blank" rel="noreferrer noopener">galaxy clusters</a> do: where galaxy clusters can contain hundreds or even thousands of constituent galaxies, galaxy groups do not typically include more than 50,” noted <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



“The Milky Way is actually part of a galaxy group, known as the Local Group, which contains two other large galaxies (Andromeda and the Triangulum galaxy), as well as several dozen satellite and dwarf galaxies.”



<h2 class="wp-block-heading" id="h-hd-101274-a-blue-giant-star">HD 101274: A blue giant star</h2>



The bright object that appears to the right of the galaxy is the star HD 101274. “The perspective in this image makes the star and the galaxy look like close companions, but this is an illusion. HD 101274 lies only about 1,530 light-years from Earth, meaning it is about 85 thousand times closer than NGC 3783,” explained ESA.&nbsp;



The star is part of the NGC 3766 cluster, which is sometimes referred to as the Pearl Cluster, an open cluster known for its richness in bright stars and its relatively young age.



HD 101274 is categorized as a blue giant star, characterized by its high temperature and luminosity. 



Blue giants are massive stars that have left the main sequence phase of stellar evolution and are burning helium or heavier elements in their cores. These stars are known for their short lifespans relative to smaller stars due to their rapid consumption of nuclear fuel.



<h2 class="wp-block-heading" id="h-significance-of-blue-giants">Significance of blue giants</h2>



<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> like HD 101274 are important for astronomers because they help in studying the properties of stellar populations in clusters and the dynamics of stellar evolution in different environments. 



The spectral and photometric observations of such stars can provide valuable insights into the characteristics of their atmospheres, internal structures, and the processes occurring within and around them.



<h2 class="wp-block-heading" id="h-bright-central-region-of-ngc-3783">Bright central region of NGC 3783</h2>



One of the most interesting aspects of NGC 3783 is that it harbors an active galactic nucleus, meaning its central region is exceptionally luminous, likely due to the presence of a supermassive black hole. This black hole is actively accreting material, which emits a substantial amount of radiation as it spirals inward and heats up.



The galaxy is particularly known for its bright central region and has been studied extensively in the ultraviolet and X-ray light spectra to understand better the properties of the accretion disk around the black hole and the complex dynamics of the material surrounding it. These studies are crucial for understanding the physics of active galactic nuclei and the role they play in <a href="https://www.earth.com/news/galaxies-like-our-own-milky-way-are-not-unique/" target="_blank" rel="noreferrer noopener">galaxy evolution</a>.



According to ESA, NGC 3783 is a&nbsp;Type I Seyfert galaxy. “In this image it is recorded by Hubble in incredible detail, from its glowing central bar to its narrow, winding arms and the dust threaded through them, thanks to five separate images taken in different wavelengths of light," noted ESA.



“In fact, the galactic center is bright enough to Hubble that it exhibits diffraction spikes, normally only seen on stars such as HD 101274.”



<h2 class="wp-block-heading" id="h-more-about-the-ngc-3783-galaxy-group">More about the NGC 3783 galaxy group</h2>



The NGC 3783 group is part of the larger Hydra-Centaurus Supercluster, which itself is a massive collection of <a href="https://www.earth.com/news/shapes-of-one-million-galaxies-hint-at-the-universes-origins/" target="_blank" rel="noreferrer noopener">galaxies</a> and galaxy clusters located primarily in the constellations of Hydra and Centaurus.



The NGC 3783 group consists of several galaxies that are gravitationally bound and interact with each other. These interactions can influence the galaxies' evolution through mechanisms like tidal forces and merger events, which can trigger star formation, fuel central black holes, and reshape the galaxies' structures.



Studying groups like the NGC 3783 group helps astronomers understand how <a href="https://www.earth.com/news/ceers-2112-ancient-galaxy-looks-strikingly-similar-to-ours/" target="_blank" rel="noreferrer noopener">galaxies</a> evolve together in a common gravitational environment, offering insights into the dynamics and evolution of structures on cosmic scales. 



Image Credit: ESA/Hubble &amp; NASA



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Luminous galaxy NGC 3783 and a blue giant star

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



Image Credit: NASA Earth Observatory&nbsp;



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Pangong Lake on the Tibetan Plateau

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

Today's Image of the Day from the European Space Agency features the aftermath of devastating floods in the Valencia region of Eastern Spain.&nbsp;



On October 29, 2024, torrential rainfall unleashed nearly a year’s worth of precipitation in just eight hours, leading to catastrophic flash floods that affected a vast area from Málaga to Valencia. 



<h2 class="wp-block-heading" id="h-flash-floods-in-valencia">Flash floods in Valencia </h2>



<a href="https://www.earth.com/news/flash-floods-are-set-to-become-much-more-common-in-the-u-s/">Floodwaters</a> submerged entire neighborhoods and agricultural lands. Many roads and infrastructure were overwhelmed almost instantly, stranding vehicles and prompting widespread evacuations. Water levels rose faster than emergency services could respond.



One resident of Paiporta, near Valencia, told the BBC that when the water started to rise it was "like a tsunami wave."



“In a matter of minutes, flash floods caused by heavy downpours in eastern Spain swept away everything in their path. With no time to react, people were trapped in vehicles, homes and businesses,” reported the Associated Press.



More than 200 people were killed and thousands of people were rescued. According to SOS Desaparecidos, as many as 1,300 people remained unaccounted for on Friday, three days after the floods.



<h2 class="wp-block-heading" id="h-magnitude-of-the-tragedy-nbsp">Magnitude of the tragedy&nbsp;</h2>



Ángel Víctor Torres, the Minister for Territorial Policy and Democratic Memory, said: “The fact that we can’t give a number of the missing persons indicates the magnitude of the tragedy.”&nbsp;



Some areas, including the Spanish town of Alfafar, are completely cut off from communication.&nbsp;



Juan Ramón Adsuara, the mayor of Alfafar, said the aid isn't nearly enough for residents trapped in an "extreme situation."



"There are people living with corpses at home. It's very sad. We are organizing ourselves, but we are running out of everything," Adsuara told reporters. "We go with vans to Valencia, we buy and we come back, but here we are totally forgotten."



<h2 class="wp-block-heading" id="h-government-warning-was-not-issued-in-time">Government warning was not issued in time</h2>



On Tuesday morning, Spain's meteorological agency Aemet warned that torrential rains were forecast for the region of Valencia, before issuing a&nbsp; "maximum red alert.”



Carlos Mazon, Valencia’s regional president, said the government sent out an SMS alert reserved for the “worst possible scenario.” But according to a report from CNN, that alert was sent hours too late.



“By 5 p.m., Valencia’s emergency services were swamped by hundreds of pleas for help throughout the region,” wrote Atika Shubert, a CNN Senior International Correspondent.



“It was at 8 p.m. that cell phones finally buzzed with the public alert telling residents to stay indoors. Much too little, much too late, even for those downstream of the raging water who might otherwise have had time to prepare.”



The BBC also noted that many people have questioned the timing of the government's warning, which arrived more than 12 hours after Aemet issued its first red alert.



<h2 class="wp-block-heading" id="h-extreme-weather-in-a-warming-climate">Extreme weather in a warming climate</h2>



The deadly floods in Valencia were primarily caused by an extreme weather event that brought record-breaking <a href="https://www.earth.com/news/extreme-rainfall-events-are-interconnected-around-the-globe/">rainfall</a>. The intense downpour was fueled by unusually warm Mediterranean Sea temperatures, which increased moisture in the atmosphere and intensified the rainfall.&nbsp;



Climate experts link this phenomenon to climate change, as warmer seas lead to more frequent, severe storms. The combination of heavy rain and the region's limited drainage capacity led to flash flooding, overwhelming local <a href="https://www.earth.com/news/predicting-floods-its-not-just-about-rainfall/">infrastructure</a>.



Rising ocean temperatures are largely driven by increased greenhouse gases that trap more heat in the atmosphere. Oceans absorb about 90% of this excess heat, leading to warmer waters, especially near the surface.&nbsp;



This warming disrupts marine ecosystems, contributing to coral bleaching and altering habitats for species like fish and marine mammals.



With the <a href="https://www.earth.com/news/can-we-outrun-the-flood-risks-of-climate-change/">climate crisis</a> intensifying, experts warn that warmer ocean temperatures will heighten the risk of rapid, destructive rainfall events.



<h2 class="wp-block-heading" id="h-second-deadliest-flood-in-europe-this-century-nbsp">Second-deadliest flood in Europe this century&nbsp;</h2>



Prime Minister Pedro Sanchez said the disaster was the second-deadliest flood in Europe this century and that Spain was carrying out its largest deployment of army and security force personnel in peacetime. The country was sending 5,000 soldiers and 5,000 police officers to the eastern region of Valencia on Saturday.



Four days after the devastating floods, rescuers are still searching for bodies. Thousands of volunteers are helping to clean up the thick mud that covers streets, homes, and businesses in the hardest-hit towns.&nbsp;



Prime Minister Sanchez responded to people who expressed they feel abandoned with no help or communication in the days following the tragic flooding.



“I am aware the response is not enough, there are problems and severe shortages… towns buried by mud, desperate people searching for their relatives.”



"For those who at this moment are still looking for their loved ones, the whole of Spain weeps with you."



According to <a href="https://www.esa.int/">ESA</a>, the Copernicus Emergency Rapid Mapping Service has been activated to provide satellite imagery that can support rescue and recovery efforts.



Image Credit: USGS, processed by ESA&nbsp;



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Valencia floods: A tragedy fueled by extreme weather

The MODIS instrument, short for Moderate Resolution Imaging Spectroradiometer, is a key instrument aboard the Terra and Aqua satellites. MODIS is playing a vital role in the development of Earth ecosystem models, able to predict global changes, which then assist policy makers in making informed decisions about the protection of the global environment.

Heavy snow and cloud cover in the Alps are seen in this Image of the day&nbsp;from the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> and features a look at heavy snow and low clouds in the Alps. Wildlife such as ibex live in the higher peaks to elevations of 3,400 m (11,155 ft), and plants such as Edelweiss grow in rocky areas in lower elevations as well as in higher elevations.

Heavy snow and cloud cover in the Alps

Monitoring Earth Changes with MODIS

Aqua is a NASA scientific research satellite that studies precipitation, evaporation, and water cycles. Terra and Aura make up the Earth Observing System. It's the second component of the system.

A frozen Lake Erie in February Today’s Image of the Day comes from the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> and features a look at a frozen <a href="https://www.earth.com/image/icy-lake-erie/">Lake Erie</a>, which is currently 93.3 percent iced over. A frozen Lake Erie in February
This false-color image was created using data from the Moderate Resolution Imaging Spectroradiometer (MODIS) on board the Aqua satellite to differentiate between snow, ice, and clouds.
Lake Erie /ˈɪəri/ (French: Lac Érié) is the fourth-largest lake (by surface area) of the five Great Lakes in North America, and the eleventh-largest globally if measured in terms of surface area.It is the southernmost, shallowest, and smallest by volume of the Great Lakes and therefore also has the shortest average water residence time. At its deepest point Lake Erie is 210 feet (64 metres) deep. 
Situated on the International Boundary between Canada and the United States, Lake Erie&#8217;s northern shore is the Canadian province of Ontario, specifically the Ontario Peninsula, with the U.S. states of Michigan, Ohio, Pennsylvania, and New York on its western, southern, and eastern shores. These jurisdictions divide the surface area of the lake with water boundaries. 
The lake was named by the Erie people, a Native American people who lived along its southern shore. The tribal name &#8220;erie&#8221; is a shortened form of the Iroquoian word erielhonan, meaning long tail
&#8212;
By <a href="mailto:rarnold@earth.com">Rory Arnold</a>, <a href="https://www.earth.com/staff">Earth.com</a> Staff Writer
Image Credit: <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a>

A frozen Lake Erie in February

Aqua Earth Observing Satellite

This beautiful photo gallery contains 50 incredible images of Earth from Space. These images were taken by astronauts onboard the International Space Station, as well as by a multitude of NASA satellites orbiting the earth.

Today’s Image of the Day comes thanks to the <a href="https://earthobservatory.nasa.gov/IOTD/view.php?id=90654&amp;eocn=home&amp;eoci=iotd_readmore">NASA Earth Observatory</a> and features a look at Super Typhoon Noru in the Pacific Ocean just south of <a href="https://www.earth.com/news/first-blue-chrysanthemums-created/">Japan</a>.
This image was captured by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite on July 31, 2017. 
At the time the photo was taken, Typhoon Noru was located just 250 kilometers south of Iwo Jima. Maximum sustained winds hit 150 miles per hour.
The storm briefly became a category 5 on July 30, before being downgraded to a category 4 one day later.
&#8211;
By <a href="mailto:rarnold@earth.com">Rory Arnold</a>, <a href="https://www.earth.com/staff">Earth.com</a> Staff Writer
Source: <a href="https://earthobservatory.nasa.gov/IOTD/view.php?id=90654&amp;eocn=home&amp;eoci=iotd_readmore">NASA Earth Observatory</a>

Super Typhoon Noru in the Pacific Ocean

Incredible Images of Earth from Space

Photos from the International Space Station are found in this awesome Earth.com image gallery. Flat-earthers won't agree, but these incredible photos of the Earth were taken by astronauts onboard the International Space Station. The International Space Station is a modular space station in low Earth orbit.

Northern Italy from the space station is seen here in this Image of the Day from the <a href="http://www.esa.int/">European Space Agency</a> (ESA). The view includes the top half of the Italian Peninsula, along with <a href="https://www.earth.com/image/wildfires-burn-northern-corsica/">Corsica</a> and Sardinia off the coast. This image was captured by ESA astronaut Paolo Nespoli on his third and final mission to the Space Station.

Northern Italy from the Space Station

Photos from the International Space Station

A recent study has shown how lifestyle factors influence the composition of the oral microbiome - the community of beneficial bacteria and other microbes living in the mouth. 



This research, which spans different subsistence lifestyles, from nomadic hunter-gatherers to industrialized groups, reveals how both broad lifestyle patterns and specific habits like smoking shape the <a href="https://www.earth.com/news/bacteria-in-your-mouth-multiply-in-a-very-unique-way/" target="_blank" rel="noreferrer noopener">oral microbiome</a>.&nbsp;



<h2 class="wp-block-heading" id="h-diversity-of-the-oral-microbiome">Diversity of the oral microbiome</h2>



The oral microbiome plays a key role in human health, aiding in digestion, bolstering immune function, and guarding against <a href="https://www.earth.com/news/plant-pandemic-looms-as-pathogens-move-from-wild-plants-to-crops/" target="_blank" rel="noreferrer noopener">pathogens</a>. However, a shift in its balance can be linked to various health issues.&nbsp;



“The oral microbiome has been understudied, and most studies of the oral microbiome have been conducted in Western populations,” said Emily Davenport, an assistant professor of biology at <a href="https://www.psu.edu/" target="_blank" rel="noreferrer noopener">Penn State</a> and leader of the research team.&nbsp;



Davenport explained that the diversity and composition of the microbiome vary globally, and by examining it within different lifestyles, the team hopes to expand understanding of its impact on health across different populations.



<h2 class="wp-block-heading" id="h-mouth-microbes-and-diverse-lifestyles">Mouth microbes and diverse lifestyles</h2>



To understand how <a href="https://www.earth.com/news/your-brain-literally-changes-based-on-daily-activities-and-lifestyle/" target="_blank" rel="noreferrer noopener">lifestyles</a> affect the oral microbiome, the team conducted a study on 63 individuals in Nepal, a region that offered diverse subsistence strategies within the same geographic area.&nbsp;



This approach allowed researchers to assess how lifestyle influences the microbiome without the confounding effects of geographical differences like climate, disease exposure, and access to healthcare.&nbsp;



“In this study, we comprehensively investigated the oral microbiome of individuals across a range of lifestyles from the same country, Nepal,” explained Erica Ryu, the study’s first author and a graduate student at Penn State.



The participants represented a range of subsistence strategies: hunter-gatherers who move throughout the year, subsistence farmers who recently settled and started farming, agriculturalists with a longstanding history of farming, and both Nepali and American industrialists from highly industrialized settings.&nbsp;



The researchers also collected detailed lifestyle information, including diet, educational background, medical practices, and habits.



<h2 class="wp-block-heading" id="h-clear-impact-of-lifestyle-on-mouth-microbes-nbsp">Clear impact of lifestyle on mouth microbes&nbsp;</h2>



Using DNA sequencing on saliva samples, the team identified the specific bacteria present within each person’s oral microbiome.&nbsp;



The researchers found that bacterial species composition closely followed a gradient that matched the subsistence strategies, with distinct species more common among foragers and other species more common among industrialized individuals.&nbsp;



This suggests a clear impact of lifestyle on the microbiome, supporting the hypothesis that lifestyle influences which microbial species thrive.



Some of these lifestyle-related microbial species were linked to particular behaviors, such as smoking, diet, and specific plants in the diet, like nettle, which is commonly chewed in Nepali culture.&nbsp;



The findings underscore that lifestyle extends beyond just environmental context to include unique cultural and habitual factors that affect the microbiome.



<h2 class="wp-block-heading" id="h-diet-and-culture-shape-the-microbiome">Diet and culture shape the microbiome</h2>



The researchers found significant associations between certain microbes and dietary staples. For instance, individuals who primarily consumed barley and maize had distinct microbiome profiles compared to those who primarily consumed rice and wheat.&nbsp;



This reflects the idea that certain microbes may thrive depending on the grains in a person’s diet.&nbsp;



“It makes sense that different microbes might feed on the different grains in a person’s <a href="https://www.earth.com/news/feeding-children-healthy-diets-can-be-very-challenging/" target="_blank" rel="noreferrer noopener">diet</a>,” said Davenport, emphasizing the connection between dietary components and microbial composition.&nbsp;



The team also noted an association with nettle, a fibrous plant often chewed in Nepal.&nbsp;



“Nettle is a fibrous plant often chewed by the foragers in this study, much like people might chew gum,” Davenport explained, adding that its presence in the diet could contribute to the unique microbiome composition observed in Nepali foragers.



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



The study highlights <a href="https://www.earth.com/news/smoking-cigarettes-accelerates-aging/" target="_blank" rel="noreferrer noopener">smoking</a> as another significant factor influencing the oral microbiome.&nbsp;



Past research has shown that smoking affects the microbiome in industrialized populations, and the current study extends this finding across varied lifestyles.&nbsp;



The consistent association between smoking and microbiome composition suggests that certain lifestyle factors play a key role regardless of broader lifestyle patterns or geography.



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



The research team stresses the importance of considering lifestyle factors and cultural behaviors in future microbiome research.&nbsp;



The experts also advocate for the inclusion of diverse populations to achieve a more comprehensive understanding of the oral microbiome’s role in health.&nbsp;



“We studied populations in Nepal because it offered a unique way to explore the effects of lifestyle while controlling for a variety of other factors like geography that often obscure that effect,” Davenport said.&nbsp;



This approach reveals the impact of lifestyle on microbiome health, which is likely relevant for other populations as well.



“Whenever you make a shift - whether it’s to a different diet or different location or different culture - the microbiome can change too,” Davenport emphasized.&nbsp;



By investigating how microbiomes vary globally, scientists can better understand the processes that shape the microbiome and how these variations affect human health. This knowledge could lead to improved strategies for managing health outcomes and preventing diseases linked to microbiome imbalances.



The study marks a significant step forward in understanding how the oral microbiome adapts to diverse lifestyles, offering new insights that could inform future healthcare and conservation efforts around the world.



The findings are published in the journal Microbiome.



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Mouth microbes reflect your lifestyle choices

A recent study has shown how lifestyle factors influence the...

A recent study has highlighted how plastics impact the environment, health, and human well-being in ways far more intricate and damaging than previously understood. 



The study uses the <a href="https://www.stockholmresilience.org/research/planetary-boundaries.html" target="_blank" rel="noreferrer noopener">Planetary Boundaries framework</a> to examine the full life cycle of <a href="https://www.earth.com/news/major-plastic-pollution-lurks-beneath-the-surface-of-rivers/">plastics</a>, showing their impacts on global environmental issues including climate change, biodiversity loss, and freshwater and land use.



“It’s necessary to consider the full life cycle of plastics, starting from the extraction of fossil fuel and the primary plastic polymer production,” explained lead author Patricia Villarrubia-Gómez, a doctoral student at the <a href="https://www.stockholmresilience.org/" target="_blank" rel="noreferrer noopener">Stockholm Resilience Center</a> at Stockholm University.



<h2 class="wp-block-heading" id="h-global-plastic-overload">Global plastic overload</h2>



Currently, over 500 million tons of plastics are produced each year, yet only 9% is recycled. Plastics are pervasive, contaminating ecosystems from Mount Everest’s peak to the Mariana Trench’s depths.&nbsp;



The research team’s review reveals how plastic pollution affects fundamental Earth systems, contributing to almost every pressing global environmental challenge.



Plastics are complex synthetic materials, often combined with thousands of chemicals. Their effects extend throughout their life cycle, from raw material extraction to production, use, and release into the environment.



“Plastics are seen as those inert products that protect our favorite products or make our lives easier, that can be ‘easily cleaned up’ once they become waste. But this is far from reality,” noted Villarrubia-Gómez.



“Plastics are made out of the combination of thousands of chemicals. Many of them, such as endocrine disruptors and chemicals, pose toxicity and harm to ecosystems and <a href="https://www.earth.com/news/how-marine-protected-areas-boost-human-health/" target="_blank" rel="noreferrer noopener">human health</a>.” 



<h2 class="wp-block-heading" id="h-interconnected-impacts-of-plastics">Interconnected impacts of plastics</h2>



Until now, most research and policy efforts have focused on specific aspects of plastic pollution, often treating it primarily as a waste management problem.&nbsp;



However, the research highlights that plastics’ impacts are interconnected, destabilizing the Earth system in ways previously overlooked.



“The impacts of plastics on the Earth system are complex and interconnected,” said co-author Sarah Cornell, an expert in global sustainability at the Stockholm Resilience Center. “This work clearly demonstrates how plastics are acting to destabilize the system.”



<h2 class="wp-block-heading" id="h-earth-system-impacts-of-plastic">Earth system impacts of plastic</h2>



To more effectively address these impacts, the researchers propose an impact pathway approach. This framework includes indicators at three main stages of plastics’ life cycle: extraction and production, environmental release, and systemic Earth impacts.&nbsp;



Rather than seeking a single quantitative threshold for plastic pollution within the Planetary Boundaries framework, they suggest a set of control variables that can better capture the multifaceted nature of plastics pollution.



“We emphasize the need to account for impacts at all stages along the life cycle of plastics,” Villarrubia-Gómez said. “We propose a set of control variables that together allow us to better understand and control plastics pollution.”



<h2 class="wp-block-heading" id="h-challenges-in-data-transparency-nbsp">Challenges in data transparency&nbsp;</h2>



The research team examined publicly available data on plastic production, noting significant challenges in standardizing and reporting. In 2022 alone, at least 506 million tons of plastics were produced worldwide.&nbsp;



Since the 1950s, an estimated total of 11,090 million tons have been produced. However, inconsistent data reporting, lack of methodological detail, and missing metadata complicate reliable assessments.



The team noted that this data gap limits both research and policy responses. Even with current limitations, the available evidence demonstrates how plastics contribute to environmental harm at planetary scales.&nbsp;



Plastic pollution affects ecosystems directly, through physical contamination, and indirectly, by altering Earth’s biophysical processes.



<h2 class="wp-block-heading" id="h-solutions-to-address-planetary-health">Solutions to address planetary health</h2>



For people across the globe, the impacts of plastic pollution are becoming more severe as <a href="https://www.earth.com/news/humans-have-exceeded-six-of-nine-planetary-boundaries/" target="_blank" rel="noreferrer noopener">planetary boundaries</a> are increasingly breached. 



Understanding how plastics interact within the Planetary Boundaries framework can support more sustainable strategies to address pressing environmental issues.



Study co-author Bethanie Carney Almroth, an expert in the environmental impact of plastics at the <a href="https://www.gu.se/en" target="_blank" rel="noreferrer noopener">University of Gothenburg</a>, noted that plastics are now found in the most remote regions of the planet and in the most intimate - within human bodies.



“And we know that plastics are complex materials, released into the environment throughout the plastics life cycle, resulting in harm in many systems,” she said.&nbsp;



“The solutions we strive to develop must be considered with this complexity in mind, addressing the full spectrum of safety and sustainability to protect people and the planet.”



<h2 class="wp-block-heading" id="h-reframing-plastic-pollution-policy">Reframing plastic pollution policy</h2>



With international Plastics Treaty negotiations approaching, the researchers urge experts and policymakers to view plastic pollution as more than a waste issue.&nbsp;



By focusing on the entire lifecycle and material flow, they hope policymakers can address the effects of plastic pollution on Earth's fundamental systems.



This shift in perspective could enable more precise tracking of plastic pollution’s impact on <a href="https://www.earth.com/news/the-interlinked-crisis-of-plastic-pollution-and-global-warming/" target="_blank" rel="noreferrer noopener">climate</a>, biodiversity, and resources, allowing for timely, targeted responses.



The study is published in the journal <a href="https://dx.doi.org/10.1016/j.oneear.2024.10.017" target="_blank" rel="noreferrer noopener">One Earth</a>,



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Plastic pollution is changing the entire Earth system

A recent study has highlighted how plastics impact the environment,...

Have you ever found yourself acting differently when you know you're being watched? Well, it turns out, humans aren't the only ones who feel the pressure of an audience. Recent research has revealed that chimpanzees also feel the influence of onlookers.



The fact that chimpanzees' performance changes based on whether they're being watched or not is utterly fascinating.



“It was very surprising to find that chimpanzees are affected in their task performance by audience members, and by human audience members nonetheless!” said Christen Lin of <a href="https://www.kyoto-u.ac.jp/en" target="_blank" rel="noreferrer noopener">Kyoto University</a> in Japan.



“One might not expect a <a href="https://www.earth.com/news/chimpanzees-use-rapid-gestures-in-conversations-like-humans/" target="_blank" rel="noreferrer noopener">chimp</a> to particularly care if another species is watching them perform a task, but the fact that they seem to be affected by human audiences even depending on the difficulty of the task suggests that this relationship is more complex than we would have initially expected.”



<h2 class="wp-block-heading" id="h-chimpanzees-and-the-audience-effect">Chimpanzees and the audience effect</h2>



A group of researchers, including Shinya Yamamoto and Akiho Muramatsu, took the lead on this study. They were curious to find out if the "audience effect," often ascribed to how we humans manage our reputation, may also exist in non-human primates.



People are often unconsciously attentive to who's observing them, which may influence their <a href="https://www.earth.com/news/mother-child-play-is-a-crucial-part-of-chimpanzee-development/" target="_blank" rel="noreferrer noopener">behavior</a> and performance.



But what about chimps? It's known that chimpanzees also exist within hierarchical societies like ours, but it wasn't immediately clear if their performance might be swayed by who is watching.



<h2 class="wp-block-heading" id="h-chimpanzees-in-the-company-of-humans">Chimpanzees in the company of humans</h2>



"Our study site is special in that chimpanzees frequently interact with and even enjoy the company of humans here, participating almost daily in various touch screen experiments for food rewards," explained Muramatsu.



This unique interaction between chimps and humans provided the researchers with an opportunity. 



Not only were they able to investigate potential similarities in audience-related effects, but they were able to do so in a context where chimps already share unique bonds with humans.



<h2 class="wp-block-heading" id="h-human-observers-affect-chimpanzees">Human observers affect chimpanzees</h2>



The experiment conducted by the researchers was meticulously designed to examine how the presence of a human audience affected the chimpanzees' performance. 



The setup involved <a href="https://www.earth.com/news/how-machine-learning-can-help-us-protect-chimpanzees/" target="_blank" rel="noreferrer noopener">chimpanzees</a> engaging in tasks of varying complexity on touch screens while their interactions with human observers were carefully monitored. 



The tasks ranged from simple, requiring basic selections, to complex sequences that challenged the chimps' problem-solving abilities. 



The presence of different types of human observers - familiar or unfamiliar, and well-dressed or casually attired - added layers of complexity to the experiment. This rigorous approach ensured that the results were not merely anecdotal but grounded in robust scientific inquiry.



<h2 class="wp-block-heading" id="h-understanding-primate-behavior">Understanding primate behavior</h2>



The findings from this study have significant implications for our <a href="https://www.earth.com/news/chimpanzees-continue-learning-as-adults/" target="_blank" rel="noreferrer noopener">understanding of primate behavior</a> and cognition. If chimpanzees modify their actions based on the human gaze, they may have the ability to perceive and interpret social cues from another species.



This capability suggests a higher level of cognitive functioning and raises intriguing questions about the evolutionary bridges connecting human and non-human primates. It also prompts a reconsideration of how we view the social dynamics within captive and wild chimpanzee populations. 



By recognizing the nuanced ways in which chimpanzees interact with humans, researchers can better tailor enrichment activities and conservation strategies to support their psychological and physical well-being.



<h2 class="wp-block-heading" id="h-performing-for-an-audience">Performing for an audience</h2>



The researchers made their discovery after analyzing thousands of sessions where chimpanzees completed a touch screen task spanning six years.



In three different number-based tasks, chimpanzees performed better on the most difficult task when the number of experimenters observing them increased. 



For the simplest task, however, the <a href="https://www.earth.com/news/chimpanzees-seek-medicinal-plants-when-theyre-sick-or-injured/" target="_blank" rel="noreferrer noopener">chimps</a> performed worse when being watched by more experimenters or other familiar people.



What's the reason behind these audience-related effects? It's not clear-cut, even for humans. The researchers theorize that further study in non-human apes might provide more insight into how this trait evolved and its purpose.



<h2 class="wp-block-heading" id="h-chimpanzees-and-human-audiences">Chimpanzees and human audiences</h2>



"Our findings suggest that how much humans care about witnesses and audience members may not be quite so specific to our species," noted Yamamoto.



"These characteristics are a core part of how our societies are largely based on reputation. If chimpanzees also pay special attention towards audience members while they perform their tasks, it stands to reason that these audience-based characteristics could have evolved before reputation-based societies emerged in our great ape lineage."



The study is published in the journal <a href="https://www.cell.com/iscience/fulltext/S2589-0042(24)02416-7" target="_blank" rel="noreferrer noopener">iScience</a>.



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Chimpanzees feel the pressure to perform with an audience

Have you ever found yourself acting differently when you know...

Have you ever wondered what sets human culture apart? It’s a loaded question that has puzzled scientists for centuries. 



Indeed, human culture - our shared knowledge and practices passed down over generations - has an undeniable vitality that seems unparalleled in the animal kingdom.



Thomas Morgan, an evolutionary anthropologist and a scholar from <a href="https://www.asu.edu/" target="_blank" rel="noreferrer noopener">Arizona State University</a>, is shedding new light on this enduring question. He brings exciting ideas to the table which might alter how we view ourselves and the world.



"Ten years ago it was basically accepted that it was the ability of human culture to accumulate and evolve that made us special, but new discoveries about <a href="https://www.earth.com/news/humans-share-many-of-the-same-behaviors-as-animals-that-live-nearby/" target="_blank" rel="noreferrer noopener">animal behavior</a> are challenging these ideas and forcing us to rethink what makes our cultures, and us as a species, unique," said Morgan. 



<h2 class="wp-block-heading" id="h-teaching-and-learning-across-species">Teaching and learning across species</h2>



What's fascinating is that the act of passing knowledge to subsequent generations isn't exclusive to humans. Animals also engage in this practice.



Take leafcutter ants, for example. When a new queen hatches, she takes a bit of her mother's fungus to start her colony. 



This practice has been ongoing for millions of years to the point that the fungus within these colonies has evolved to be genetically different from the wild fungus.



The parallels don't stop there. Much like human <a href="https://www.earth.com/news/babies-begin-to-learn-language-before-they-are-even-born/" target="_blank" rel="noreferrer noopener">languages</a> evolve over time, humpback whale songs undergo the same process. They change, spread between groups, and become more complex over time.



Chimpanzees also learn to use tools, something they've been doing for thousands - or perhaps even millions - of years.



Locusts, too, adapt to local conditions, relying on epigenetic changes to transition between various forms based on overpopulation.



<h2 class="wp-block-heading" id="h-open-ended-nature-of-human-culture">Open-ended nature of human culture</h2>



With the growing evidence of <a href="https://www.earth.com/news/humans-started-cumulative-culture-around-600000-years-ago/" target="_blank" rel="noreferrer noopener">evolving cultures</a> among animals, it leads us to question: What is special about human culture that sets us apart from other animals?



In their paper, "Human culture is uniquely open-ended, not uniquely cumulative," Morgan and Stanford University Professor Marcus Feldman provide an intriguing answer. They suggest that it's the human ability to conceive and understand endless possibilities that make us so influential.



The distinguishing feature of the <a href="https://www.earth.com/news/largest-ever-3d-map-of-human-brain-created-by-harvard-and-google/" target="_blank" rel="noreferrer noopener">human brain</a>, according to Morgan, lies in our ability to build and remember complex sequences of instructions. This permits us to exhibit an almost limitless range of behaviors - a trait referred to as open-endedness.



<h2 class="wp-block-heading" id="h-limited-evolution-of-animal-cultures">Limited evolution of animal cultures</h2>



“The way that animals think about what they’re doing constrains the way that their cultures can evolve. One way might be that they can’t imagine elaborate sequences very easily, or they can’t imagine subgoals," said Morgan. 



“For example, when I’m making my boys’ breakfast in the morning, it’s a nested, multistep process. First, I need to get the bowls and pots and other equipment. Then I need to put the ingredients in the pot and start cooking, all in the right amounts and order. Then I need to cook it, stirring and monitoring temperature until it reaches the right consistency, and then I need to serve it up."



“Each of these steps is a subgoal, and these subgoals have steps within them that I need to execute in the right order, so this whole thing is an elaborate procedure.”



<h2 class="wp-block-heading" id="h-redefining-cultural-evolution">Redefining cultural evolution</h2>



Unlike previous comparisons of human and <a href="https://www.earth.com/news/humans-are-not-the-only-animals-that-create-their-own-culture/" target="_blank" rel="noreferrer noopener">animal cultures</a>, Morgan and Feldman's research stands out. 



The study includes comparisons of animal examples of epigenetic inheritance and parental effects, such as the leafcutter ant (parental effect) and the locust (cumulative epigenetic inheritance).



While both epigenetic inheritance and parental effects are stable and accumulate in non-human species, they eventually stop developing, noted Morgan. “Just like animal cultures, there are constraints that these systems run-up against and that halt their evolution.” 



“I think the key question is what is special about human culture, and we tried to answer that by comparing human cultures with animal cultures, with epigenetics, and with parental effects - as many evolving systems as we can think of," said Morgan.



"And in the end we concluded that the special thing about human culture is its open-endedness. It can accumulate but then it never has to stop, it just keeps going.”



<h2 class="wp-block-heading" id="h-understanding-human-culture">Understanding human culture</h2>



As Morgan and Feldman’s research pushes the boundaries of how we perceive human culture, it opens the door to new questions and areas of exploration. 



What other aspects of human cognition might contribute to this unparalleled open-endedness? Could understanding this trait lead to advancements in artificial intelligence that mimic human learning processes? 



The answers to these questions could further illuminate the unique intricacies of human culture, solidifying our place as a species defined not just by cumulative knowledge but by the potential for infinite cultural innovation.



The study is published in the journal <a href="https://www.nature.com/articles/s41562-024-02035-y" target="_blank" rel="noreferrer noopener">Nature Human Behaviour</a>.



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What sets human culture apart from other animals?

Have you ever wondered what sets human culture apart? It’s...

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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

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

Droughts define the American West - dry, dusty, and unforgiving. Yet, these recurring droughts are not solely due to a lack of rainfall as previously thought.



A recent study indicates a different narrative, placing the blame on rising temperatures caused by human-induced climate change.



The study asserts that increased evaporation, driven by warmer temperatures, has played a more significant role than decreased precipitation in droughts across the American West, especially since 2000.



The study was conducted by scientists at UCLA and the National Oceanic and Atmospheric Administration (NOAA).



<h2 class="wp-block-heading" id="h-rising-heat-and-drought-severity">Rising heat and drought severity</h2>



The researchers concluded that during the 2020-2022 drought, evaporation accounted for 61 percent of the drought’s severity, while reduced precipitation contributed only 39 percent.



Study lead author Rong Fu, a <a href="https://www.ucla.edu/" target="_blank" rel="noreferrer noopener">UCLA</a> professor of atmospheric and oceanic sciences, made an interesting clarification.



“Research has already shown that <a href="https://www.earth.com/news/flash-droughts-are-increasing-around-the-world-due-to-warming-climate/" target="_blank" rel="noreferrer noopener">warmer temperatures</a> contribute to drought, but this is, to our knowledge, the first study that actually shows that moisture loss due to demand is greater than the moisture loss due to lack of rainfall," noted Professor Fu.



<h2 class="wp-block-heading" id="h-a-shift-in-perspective">A shift in perspective </h2>



Historically, drought in the West has been associated with reduced rainfall. However, warming temperatures caused by the burning of fossil fuels have intensified evaporative demand.



This clearly broadens our perspective on the causes of drought, highlighting the need to account for human activities and their impacts on the environment.



Veva Deheza, executive director of NOAA’s National Integrated Drought Information System and co-author of the study, elaborated on this shift in understanding.



"For generations, drought has been associated with drier-than-normal weather. This study further confirms we’ve entered a new paradigm where rising temperatures are leading to intense droughts, with precipitation as a secondary factor," said Deheza.



<h2 class="wp-block-heading" id="h-the-rain-that-never-falls">The rain that never falls</h2>



Our climate is a complex system. As the planet warms, evaporation rates increase. Even though a warmer atmosphere can hold more water vapor, it will not necessarily result in precipitation.



Heat keeps water molecules in constant motion, making condensation - and thus <a href="https://www.earth.com/news/greenhouse-gas-emissions-cause-a-major-delay-in-rainfall/" target="_blank" rel="noreferrer noopener">rainfall</a> - difficult. This cyclic process suggests that droughts will last longer, cover wider areas, and be even drier with every bit that the planet warms.



<h2 class="wp-block-heading" id="h-heat-evaporation-and-droughts">Heat, evaporation, and droughts</h2>



What happens when we analyze observational data over a 70-year period about "natural" droughts and those resulting from <a href="https://www.earth.com/news/indisputable-evidence-of-human-caused-climate-change/" target="_blank" rel="noreferrer noopener">human-induced climate change</a>? 



Surprisingly, researchers found that climate change has accounted for 80 percent of the increase in evaporative demand since 2000. During the drought periods, that figure increased to more than 90 percent.



These figures reveal that climate change is the main driver increasing drought severity and expansion since 2000.



<h2 class="wp-block-heading" id="h-climate-change-and-drought-severity">Climate change and drought severity </h2>



The researchers made a dramatic comparison of drought patterns. Before 2000, only 26 percent of droughts were caused by high evaporative demand. Since 2000, this figure jumped to 66 percent.



Professor Fu highlighted the impact of climate change on the drought severity. 



"Though the drought began through a natural reduction in precipitation, I would say its severity was increased from the equivalent of ‘moderate’ to ‘exceptional' on the drought severity scale due to climate change.”



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



The study concludes with a warning. If the emission of <a href="https://www.earth.com/news/state-of-the-climate-greenhouse-gases-hit-a-record-high-in-2022/" target="_blank" rel="noreferrer noopener">greenhouse gases</a> continues unabated, what we once considered severe droughts will become more frequent events in the not-so-distant future.



“Even if precipitation looks normal, we can still have drought because moisture demand has increased so much and there simply isn’t enough water to keep up with that increased demand," said Professor Fu.



"This is not something you could build bigger reservoirs or something to prevent because when the atmosphere warms, it will just suck up more moisture everywhere. The only way to prevent this is to stop temperatures from increasing, which means we have to stop emitting greenhouse gases.”



The research was supported by NOAA’s National Integrated Drought Information System and Climate Program Office, and the National Science Foundation.



The findings highlight the urgent need to address climate change. The future of the American West depends on us - on our actions and our commitment to preserving the environment.



The study is published in the journal <a href="https://www.science.org/doi/10.1126/sciadv.adn9389" target="_blank" rel="noreferrer noopener">Science Advances</a>.



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Climate change is now the driving force behind droughts

Droughts define the American West - dry, dusty, and unforgiving....

Crows are more than just black-feathered figures cawing from treetops; they are masters of memory and grudges, with cognitive abilities that defy our expectations. 



While we often admire birds for their bright plumage and lilting songs, there is a deeper layer to their behavior that remains unseen. 



Birds are more intelligent than most people realize, especially when it comes to recalling those who pose a threat.



Recent research has illuminated this startling dimension of avian behavior, revealing that crows -- members of the avian elite -- can hold grudges for up to 17 years.



This discovery showcases the profound capacity of the crows' memories. The study also sheds light on the social transmission of knowledge about threats within bird communities.



<h2 class="wp-block-heading" id="h-studying-crows-and-grudges">Studying crows and grudges</h2>



The research project, led by experts at the <a href="https://www.washington.edu/" target="_blank" rel="noreferrer noopener">University of Washington</a>, was launched in 2006. 



Professor John Marzluff, an environmental scientist, initiated the study by donning a fearsome mask and temporarily trapping seven crows. He identified them with leg rings before their safe release.



In subsequent years, the professor and his assistants sporadically wore the same mask -- strolling the university campus while feeding the resident crows.



Marzluff recalled an incident while wearing the mask when 47 out of 53 crows he encountered vehemently scolded him.



This was a substantial increase from the original seven crows that were captured, suggesting that these <a href="https://www.earth.com/news/do-birds-dream-of-flying-scientists-say-they-now-know-the-answer/" target="_blank" rel="noreferrer noopener">birds</a> could recognize threatening humans and pass on this knowledge to their kin.



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



The climax of this fascinating study came in 2013 when the number of aggressive caws reached their peak, only to gradually decrease. 



By September 2023 -- 17 years since the experiment began -- not a single scolding crow was heard on one of Marzluff's masked walks.



<h2 class="wp-block-heading" id="h-seeing-behind-the-mask">Seeing behind the mask</h2>



Another intriguing facet of the study involved the use of a "neutral" mask, bearing the likeness of Dick Cheney, who was the vice president of the United States at the time.



Those sporting the Cheney mask fed the crows without causing them any <a href="https://www.earth.com/news/new-years-fireworks-send-millions-of-birds-on-erratic-flights/" target="_blank" rel="noreferrer noopener">distress</a>, and were subsequently spared of avian wrath.



As the research progressed, unknowing volunteers were roped in to wearing the masks, ignorant of the "dangerous" or "neutral" categorization by the crows.



One such volunteer found himself at the center of an avian uproar, confirming the crows' skill in discerning and remembering threats.



<h2 class="wp-block-heading" id="h-dive-bombing-attacks-by-crows">Dive-bombing attacks by crows</h2>



A report published in Mail Online shares some other instances of crows with a grudge. In Dulwich, a posh London suburb, residents reported instances of crows executing dive-bombing attacks.



One resident, Alison Frean, shared her harrowing experience, revealing that she had been targeted by crows on three separate occasions when trying to exit her car.



This had a profound impact on the residents, as they chose to stay indoors, attempting to avoid any crow confrontations.



<h2 class="wp-block-heading" id="h-intelligence-of-crows">Intelligence of crows</h2>



Crows never cease to amaze with their incredible intelligence, and it isn't confined to recognizing threats and holding grudges. 



Prior research indicates that crows possess the talent to devise tools and even <a href="https://www.earth.com/news/crows-count-out-loud-just-like-toddlers/" target="_blank" rel="noreferrer noopener">count</a>.



Stories abound of crows dropping nuts onto busy roads, waiting for cars to crack them open, and then retrieving the food once the traffic stops. 



Some crows have even figured out how to use sticks to extract insects from tree bark or fashion hooks from twigs to fish out food from hard-to-reach places.



The study from the University of Washington undeniably contributes to affirming the crows' place in the intelligence hierarchy among birds. 



Crows, it appears, are creatures of memory, holding on to grudges and recalling threats even after a lengthy span of 17 years. 



<h2 class="wp-block-heading" id="h-social-dynamics-of-crow-behavior">Social dynamics of crow behavior</h2>



Beyond their <a href="https://www.earth.com/news/mountain-chickadees-have-an-extraordinary-memory/" target="_blank" rel="noreferrer noopener">impressive memory</a> and intelligence, crows exhibit complex social structures that further highlight their cognitive sophistication. 



They live in tight-knit family groups and exhibit behaviors that suggest complex emotional lives. 



For instance, they've been observed holding what appear to be "funerals" for deceased members of their flock. 



Their communication is sophisticated, involving a range of vocalizations and even regional dialects. 



This communication is not limited to warnings about potential threats; crows have been observed sharing information about food sources and even forming alliances to fend off predators.



<h2 class="wp-block-heading" id="h-animals-and-cultural-transmission">Animals and cultural transmission </h2>



One of the most remarkable aspects of crow behavior is their ability to teach one another. 



When a crow learns to associate a specific individual or object with danger, it can relay this information to others in its community, spreading awareness rapidly.



Communal learning helps ensure that knowledge of potential threats is preserved and passed down, allowing even young crows to recognize dangers without firsthand experience.



This intricate network of social interactions places crows among the few non-human animals capable of cultural transmission -- passing knowledge from one generation to the next.



It is no surprise that these birds are revered in many cultures, often viewed as symbols of intelligence and adaptability.



The full study was published in <a href="http://rspb.royalsocietypublishing.org/content/early/2011/06/20/rspb.2011.0957" target="_blank" rel="noreferrer noopener">the Proceedings of the Royal Society B</a>. 



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Crows hold grudges against individual humans for up to 17 years

Crows are more than just black-feathered figures cawing from treetops;...

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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



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Flu viruses are more flexible than expected

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

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



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



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



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



Video/Image Credit: ESA&nbsp;



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

Lake Trasimeno in Central Italy

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



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



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



Video Credit: American Chemical Society&nbsp;



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



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

Detecting mercury contamination with the tap of a finger

[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"] Today's Video of the Day from the...

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



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



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



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



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



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



Video/ Image Credit: European Space Agency&nbsp;



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



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

Kainji Lake in north central Nigeria

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



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



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



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



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



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



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



Video Credit: Amanda Nguyen/University of Illinois



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



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

Designing crops that can beat the heat

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