Today's Image of the Day from NASA Earth Observatory features Cyclone Chido, an intense tropical cyclone that caused unprecedented devastation across Southeast Africa in December 2024.



On December 14, Chido struck the islands of Mayotte with wind speeds exceeding 200 km/h (124 mph) and gusts over 225 km/h (140 mph), marking it as the most powerful storm to hit the French territory in at least 90 years.&nbsp;



The <a href="https://www.earth.com/news/fast-moving-tropical-cyclones-are-becoming-more-powerful/" target="_blank" rel="noreferrer noopener">cyclone</a> ultimately made three landfalls - all with winds equivalent to those of a Category 4 tropical cyclone. According to media reports, authorities in Mayotte fear that hundreds and possibly thousands of people have died.



<h2 class="wp-block-heading" id="h-rapid-intensification-of-chido">Rapid intensification of Chido</h2>



“Chido formed in the southeastern Indian Ocean on December 5, 2024. The disturbance rapidly intensified before hitting the Mauritian islands of Agaléga on December 11. The next day, the cyclone peaked in intensity, with sustained winds of about 250 kilometers (155 miles) per hour - equivalent to a strong Category 4 hurricane on the Saffir-Simpson wind scale,” noted <a href="https://earthobservatory.nasa.gov/images/153708/cyclone-chido-pummels-mayotte" target="_blank" rel="noreferrer noopener">NASA</a>.&nbsp;&nbsp;



“According to the Joint Typhoon Warning Center, Cyclone Chido continued to move west in an environment favorable for sustaining storms. That included warm <a href="https://www.earth.com/news/ocean-warming-has-nearly-doubled-in-the-last-decade/" target="_blank" rel="noreferrer noopener">sea surface temperatures</a> of up to 29 degrees Celsius (84 degrees Fahrenheit) and low vertical wind shear.



<h2 class="wp-block-heading" id="h-devastation-of-cyclone-chido-nbsp">Devastation of Cyclone Chido&nbsp;</h2>



The cyclone obliterated entire neighborhoods, particularly in hillside shantytowns inhabited by undocumented migrants. Official reports confirm at least 31 fatalities and thousands of injuries - though the actual death toll may be significantly higher.&nbsp;



The destruction in Mayotte's capital, Mamoudzou, has left approximately 100,000 people homeless. The aftermath has been characterized by a lack of visible assistance from authorities, with residents relying on community support amid concerns over hunger, disease outbreaks, and lawlessness.&nbsp;



<h2 class="wp-block-heading" id="h-landfall-in-mozambique-nbsp">Landfall in Mozambique&nbsp;</h2>



Following its impact on Mayotte, Chido continued westward, making landfall in Mozambique on December 15 near the city of Pemba as a strong Category 4-equivalent intense tropical cyclone.&nbsp;



The storm resulted in at least 34 deaths and 43 injuries across three northern provinces. In neighboring Malawi, Chido claimed two lives.&nbsp;



The cyclone's ferocity, fueled by warmer ocean temperatures attributed to climate change, has raised concerns about the increasing frequency and <a href="https://www.earth.com/news/coastal-hurricanes-are-intensifying-faster-due-to-climate-change/" target="_blank" rel="noreferrer noopener">intensity</a> of such storms in the region.&nbsp;



<h2 class="wp-block-heading" id="h-recovery-efforts-and-vulnerable-communities-nbsp">Recovery efforts and vulnerable communities&nbsp;</h2>



The crisis has highlighted the vulnerabilities of affected regions, particularly Mayotte, which faces challenges of poverty, overcrowding, and inadequate infrastructure.&nbsp;



The lack of preparedness and insufficient emergency response have drawn criticism, highlighting the need for improved disaster management and investment in resilient infrastructure to mitigate the impacts of future climate-induced disasters.&nbsp;



In response to the disaster, French President Emmanuel Macron is scheduled to visit Mayotte, and relief efforts are underway, including the arrival of a ship carrying 180 tons of aid.&nbsp;



However, the scale of destruction and ongoing challenges in delivering assistance to remote and inaccessible areas continue to impede recovery efforts.&nbsp;



<h2 class="wp-block-heading" id="h-climate-fueled-intensification-of-cyclones-nbsp">Climate-fueled intensification of cyclones&nbsp;</h2>



The <a href="https://www.earth.com/news/the-rising-impact-of-tropical-cyclones-in-a-warming-world/" target="_blank" rel="noreferrer noopener">intensification of cyclones</a> due to climate change is a significant and concerning phenomenon. As global temperatures rise, warmer ocean waters provide the energy that fuels tropical cyclones, making them stronger and more destructive.&nbsp;



Higher <a href="https://www.earth.com/news/pacific-ocean-temperatures-highest-in-650-years-greatly-harming-coral-reefs/" target="_blank" rel="noreferrer noopener">sea surface temperatures</a> lead to increased evaporation, which adds more moisture to the atmosphere. This moisture can enhance the rainfall associated with cyclones, increasing the risk of flooding.&nbsp;



Additionally, rising sea levels, driven by the melting of polar ice caps and thermal expansion of seawater, exacerbate storm surge impacts, causing more extensive and severe coastal flooding during cyclonic events.



Changes in atmospheric conditions also play a role. While climate change may not increase the overall frequency of cyclones, it is likely to shift the distribution and intensity of these storms. For instance, studies suggest that a larger proportion of cyclones are reaching the most intense categories.&nbsp;



Furthermore, slower-moving cyclones, a trend linked to weakened steering currents, can linger longer over vulnerable areas, compounding the damage with prolonged heavy rainfall and strong winds.



These changes in cyclone behavior present challenges for disaster preparedness and response. Coastal communities, particularly in low-lying regions, are becoming increasingly vulnerable to the compounded impacts of more powerful storms, highlighting the urgent need for climate mitigation and adaptation strategies.



The image was captured by the VIIRS (Visible Infrared Imaging Radiometer Suite) on the NOAA-20 satellite, about three hours after the storm made landfall.



Image Credit: NASA Earth Observatory&nbsp;



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Cyclone Chido’s path of destruction: A climate wake-up call

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

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



“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.&nbsp;



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



Image Credit: NASA Earth Observatory&nbsp;



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Pangong Lake on the Tibetan Plateau

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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Young, massive stars in the Triangulum Galaxy

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

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



Image Credit: NASA Earth Observatory



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Fedchenko Glacier in the Pamir Mountains

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



Image Credit: NASA/ESA Hubble Space Telescope



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NGC 5643: Secrets of a spiraling galactic powerhouse

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



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



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



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



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



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



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



The lake was formed after the collapse of the Nemrut volcano's summit. This collapse created a massive crater, which gradually filled with water over time, forming the <a href="https://www.earth.com/news/alarming-study-most-of-the-worlds-largest-lakes-are-quickly-losing-water/" target="_blank" rel="noreferrer noopener">lake</a>.



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



Image Credit: NASA Earth Observatory



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Mount Nemrut: Ancient mysteries and natural marvels 

The original caption for this photograph from about 1900 was “Hillbilly home and woman gathering wood.” The image is from the Tennessee mountains and it’s a testimony to the real poverty in which many Southerners lived a century and more ago. This photo is from the huge Bettmann Archive, founded in 1936 by Otto Bettmann who’d fled Europe to escape Germany before WWII. Photo Credit: Bettmann/Getty Images

Hillbilly home

Ingenuity, NASA's pioneering Mars helicopter, marked an unprecedented milestone in aviation history when it became the first aircraft to take flight on another world.



Its journey came to an end on January 18, 2024, with a final flight that concluded an era of extraordinary achievements.



<h2 class="wp-block-heading" id="h-journey-into-the-unknown">Journey into the unknown</h2>



A team of engineers at <a href="https://www.jpl.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA’s Jet Propulsion Laboratory</a> in Southern California, in partnership with AeroVironment, has given us an exclusive, behind-the-scenes look into the final voyage of the Ingenuity Mars Helicopter.



Originally designed as a technology demonstration to carry out five experimental test flights over a 30-day period, the helicopter surpassed all expectations. 



The little explorer stayed operational for nearly three years, conducted 72 flights, and expanded its flight range 30 times beyond what was initially planned - tallying more than two hours in flight time.



<h2 class="wp-block-heading" id="h-the-final-ascent-ingenuity-rising-against-gravity">The final ascent: Ingenuity rising against gravity</h2>



The <a href="https://www.earth.com/news/mars-ingenuity-the-first-helicopter-on-the-red-planet-ends-mission-after-3-years/" target="_blank" rel="noreferrer noopener">72nd flight</a>, which we now know as the final one, was planned as a short, vertical hop to assess the flight systems and capture images of the surrounding area.



The data sent back from the flight paints a picture of Ingenuity as it ascended to a height of 40 feet (12 meters), hovered, and took photographs.



The descent was initiated at the 19-second mark, and by the 32nd second, the helicopter had touched down, halting communication. 



It would not be until the next day that contact was re-established with the mission, and images transmitted six days after the flight showed the damage sustained by Ingenuity's <a href="https://www.earth.com/image/16-ingenuitys-rotors/" target="_blank" rel="noreferrer noopener">rotor</a> blades.



<h2 class="wp-block-heading" id="h-unraveling-the-mystery-what-went-wrong">Unraveling the mystery: What went wrong?</h2>



Investigating an accident from a 100-million-mile distance is no easy feat. Without the convenience of the usual "black boxes" or eyewitnesses, the investigators had to rely solely on the data and images transmitted back.



“While multiple scenarios are viable with the available data, we have one we believe is most likely: lack of surface texture gave the navigation system too little information to work with,” explained Håvard Grip, Ingenuity’s first pilot. 



The helicopter's vision navigation system was designed to track visual features on a flat terrain. It worked with impressive accuracy for Ingenuity's first five flights, but flight 72 found the helicopter in an area of Jezero Crater that was filled with relatively featureless, steep sand ripples.



This terrain confused the navigation system, preventing it from providing the velocity estimates necessary for safe landing. 



The resulting navigation errors created high horizontal velocities at touchdown, which led the helicopter to pitch and roll. 



The strain of the rapid landing snapped off all four rotor blades at their weakest point. This resulted in excessive vibration which finally severed the communication.



<h2 class="wp-block-heading" id="h-the-legacy-continues-ingenuity-s-contributions">The legacy continues: Ingenuity's contributions</h2>



Although permanently grounded, Ingenuity's contributions have not ended. It continues to transmit weather data and avionics test data to the Perseverance rover on a weekly basis. 



This information could prove invaluable for future <a href="https://www.earth.com/news/mars-missions-prepare-intense-solar-storms-coming-red-planet/" target="_blank" rel="noreferrer noopener">Red Planet</a> explorations. In addition, lessons from the Ingenuity project have sparked research into future <a href="https://www.earth.com/news/mars-gravity-pulls-earth-closer-to-the-sun-warming-our-climate-scientists-say/" target="_blank" rel="noreferrer noopener">Mars</a> helicopters.



"Because Ingenuity was designed to be affordable while demanding huge amounts of computer power, we became the first mission to fly commercial, off-the-shelf cell phone processors in deep space," said Teddy Tzanetos, Ingenuity's project manager.



Tzanetos also noted that almost four years of continuous operation suggested that not everything on Mars needed to be bigger, heavier, and radiation-hardened in order to function.



<h2 class="wp-block-heading" id="h-the-future-of-flight-on-mars">The future of flight on Mars</h2>



Inspired by Ingenuity, NASA engineers have been testing smaller, lighter avionics for vehicle designs, particularly for the <a href="https://www.earth.com/news/air-samples-from-mars-could-reveal-fascinating-secrets/" target="_blank" rel="noreferrer noopener">Mars Sample Return</a> campaign. 



The data from Ingenuity is also assisting engineers in developing the concept for a future Mars helicopter.



This new venture, currently named Chopper, is approximately 20 times heavier than Ingenuity, is designed to carry several pounds of scientific equipment, and is expected to explore remote Martian locations while traveling up to 2 miles (3 kilometers) in a day.



Ingenuity has broadened our horizons about the future of interplanetary flight. "Ingenuity has given us the confidence and data to envision the future of flight at Mars," concluded Tzanetos.



Information for this article was sourced from the <a href="https://www.jpl.nasa.gov/news/nasa-performs-first-aircraft-accident-investigation-on-another-world/" target="_blank" rel="noreferrer noopener">Jet Propulsion Laboratory</a>.



Image Credit: NASA/JPL



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NASA investigates an aviation accident on another planet

Ingenuity, NASA's pioneering Mars helicopter, marked an unprecedented milestone in...

The deepest parts of Earth's oceans have mostly remained a mystery, mainly because current technology on sea vessels cannot easily map every trough and chasm scattered around the planet.



Traditional methods tend to rely on slow and expensive ship-based surveys and, even after decades of effort, vast expanses of the ocean floor remain unknown. These blind spots have limited our understanding of underwater landscapes, the growth of tectonic structures, and the habitat ranges of strange marine creatures that lurk far below.



<h2 class="wp-block-heading" id="h-using-satellites-to-map-the-ocean-floor">Using satellites to map the ocean floor</h2>



<a href="https://www.nist.gov/how-do-you-measure-it/our-world/how-do-you-measure-depth-ocean" target="_blank" rel="noreferrer noopener">Shipborne sonar</a>, while effective, is far too time-consuming when considering the scale of <a href="https://www.earth.com/news/north-atlantic-ocean-has-a-memory-that-lasts-up-to-20-years/" target="_blank" rel="noreferrer noopener">Earth’s oceans</a>. Over a century would pass before the entire seabed could be charted this way. Sensors placed on satellites represent a much faster approach, relying on tiny variations in sea surface height to infer submarine features. 



For the past several decades, this <a href="https://topex.ucsd.edu/marine_grav/explore_grav.html" target="_blank" rel="noreferrer noopener">radar-altimeter</a>-based approach has allowed scientists to produce seafloor maps at moderate resolution. A collaboration between <a href="https://www.nasa.gov" target="_blank" rel="noreferrer noopener">NASA</a> and <a href="https://swot.cnes.fr/en/SWOT/index.htm" target="_blank" rel="noreferrer noopener">CNES</a> launched the Surface Water and Ocean Topography (<a href="https://swot.jpl.nasa.gov/" target="_blank" rel="noreferrer noopener">SWOT</a>) mission, a new satellite tool capable of measuring ocean surface heights in unprecedented detail. One year later, the first robust results began to roll in, and were <a href="https://pubmed.ncbi.nlm.nih.gov/39666787/" target="_blank" rel="noreferrer noopener">analyzed</a> by <a href="https://yaoyu9404.github.io/" target="_blank" rel="noreferrer noopener">Yao Yu</a> at the <a href="https://scripps.ucsd.edu/" target="_blank" rel="noreferrer noopener">Scripps Institution of Oceanography</a>, University of California, San Diego (UCSD).



<h2 class="wp-block-heading" id="h-previously-hidden-details">Previously hidden details</h2>



Improved data uncovered thousands of <a href="https://www.earth.com/news/earths-oceans-are-rapidly-changing-colors-matching-climate-predictions/" target="_blank" rel="noreferrer noopener">undersea</a> peaks that were previously unrecorded. Some are only a few miles across, but these features influence currents, nutrient flow, and the movements of certain aquatic populations. “So, one year of SWOT data beat the past 30 years of traditional radar-altimeter [data] in constructing marine gravity,” said Yao Yu, a Schmidt AI in Science Postdoctoral Fellow at <a href="https://ucsd.edu/" target="_blank" rel="noreferrer noopener">UCSD</a>. 



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/12/SWOT-satellite_seafloor_mapping_major-advance_credit-EOS_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/12/SWOT-satellite_seafloor_mapping_major-advance_credit-EOS_1s.webp" alt="Using satellite altimetry data from SWOT, scientists have created a global map of marine gravity, uncovering thousands of new seamounts. (Eötvös is a unit that measures the ocean’s vertical gravity gradient.) Credit: Yao Yu, Yu et al., 2024" class="wp-image-1954024"/></a><figcaption class="wp-element-caption">Using satellite altimetry data from SWOT, scientists have created a global map of marine gravity, uncovering thousands of new seamounts. (Eötvös is a unit that measures the ocean’s vertical gravity gradient.) Credit: Yao Yu, Yu et al., 2024</figcaption></figure>



The more finely tuned view reveals intricate ridges and valleys that traditional methods missed. These fresh insights help scientists understand how underwater landforms might affect tsunami speed and direction, and whether they attract clusters of unique organisms preferring specific conditions found around submerged peaks.



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



Each submarine hill, canyon, or volcanic mount has its own story. Researchers can piece together histories of plate movements and infer where tectonic changes might happen next. This sharper perspective matters for navigators who need safe passages, and marine planners who keep an eye on resource extraction. 



Detailed underwater maps allow for better simulation of <a href="https://www.earth.com/news/collapse-of-main-atlantic-ocean-circulaton-current-amoc-is-already-happening/" target="_blank" rel="noreferrer noopener">ocean</a> circulation models, ensuring that climate forecasts gain subtle accuracy. “I am mostly impressed with the ability to [map] abyssal hills and seamounts so much [more clearly] than ever before,” said <a href="https://orbit.dtu.dk/en/persons/ole-baltazar-andersen" target="_blank" rel="noreferrer noopener">Ole Baltazar Andersen</a>, senior research scientist at the Technical University of Denmark.



<h2 class="wp-block-heading" id="h-giant-leap-for-ocean-maps">Giant leap for ocean maps</h2>



Before satellites and sonar, sailors dropped <a href="https://seahistory.org/sea-history-for-kids/leadline/" target="_blank" rel="noreferrer noopener">weighted lines</a> overboard and counted fathoms as the rope slipped through their hands. Today, radar and altimetry techniques provide scientists with more versatile options. Specialized altimeters aboard satellites, like SWOT, measure the time taken for radio pulses to bounce back from the surface.



This gives a rough sketch of the seafloor’s gravitational pull, revealing dips and bumps that mirror what lies beneath. In combination with ship-based measurements, <a href="https://www.star.nesdis.noaa.gov/socd/lsa/AltBathy/" target="_blank" rel="noreferrer noopener">satellite altimetry</a> grants a global perspective. It is not as direct as a ship’s sonar, but it covers enormous swaths of ocean in a fraction of the time.



<h2 class="wp-block-heading" id="h-real-world-benefits-of-ocean-mapping">Real world benefits of ocean mapping</h2>



Fresh ocean floor maps do not only quench our scientific curiosity. Improved <a href="https://www.star.nesdis.noaa.gov/socd/lsa/AltBathy/" target="_blank" rel="noreferrer noopener">bathymetry</a> can aid climate research. 



Ocean circulation involves currents moving cold, deep water upward, influencing carbon storage and heat distribution. If certain underwater hills guide these flows, slight improvements in understanding those features can refine models that predict future climate trends. 



More precise knowledge of the seabed’s shape might also help researchers anticipate where essential fisheries could flourish or fail.



“Improved seafloor mapping at such level of details opens new frontiers,” said <a href="https://science.nasa.gov/people/nadya-vinogradova-shiffer-physical-oceanography-program/" target="_blank" rel="noreferrer noopener">Nadya Vinogradova Shiffer</a>, Ocean Physics Program Director at NASA Headquarters in Washington, DC.



At a time when climate adaptation plans often depend on robust environmental data, these clearer images contribute to more informed <a href="https://www.earth.com/news/surprise-study-some-scientists-call-for-halting-ocean-plastic-cleanup-efforts/" target="_blank" rel="noreferrer noopener">decision-making</a>.



<h2 class="wp-block-heading" id="h-global-push-to-chart-everything">Global push to chart everything</h2>



A range of groups and organizations worldwide have pursued projects like <a href="https://seabed2030.org/" target="_blank" rel="noreferrer noopener">Seabed 2030</a>, aiming to map Earth’s entire underwater landscape by the end of the decade. 



Crowdsourced data, philanthropic funding, and cutting-edge technology promise richer, more accessible marine charts. Some researchers rely on <a href="https://www.saildrone.com/news/seabed-2030-partnership-to-map-the-ocean" target="_blank" rel="noreferrer noopener">small autonomous vessels</a>, armed with multibeam sonar, to scan sections of the ocean that remain unexplored. Others use advanced machine learning tools to process existing data and enhance resolution. This collective pursuit is essential for narrowing knowledge gaps that still puzzle those trying to map the shifting ocean conditions.



<h2 class="wp-block-heading" id="h-evolving-strategies-new-capabilities">Evolving strategies, new capabilities</h2>



Modern technology continues to advance. Older satellites captured <a href="https://eos.org/articles/new-seafloor-map-only-25-done-with-6-years-to-go" target="_blank" rel="noreferrer noopener">less detail</a>, but updated radar altimeters are more sensitive. 



The slight gravitational field changes caused by undersea mountains produce minuscule tilts in the ocean’s surface, and newer instruments register those subtle differences. These improved measurements help scientists see features that previously blended into the noise of raw data. 



More precise measurements transform the way experts look at ocean floor contours, enabling them to find patterns connected to everything from energy resources to hidden ecological hotspots.



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



Better ocean maps redefine what scientists consider ordinary. Areas once thought to be empty seascapes are now known to hold small peaks and ridges that matter to ocean life. With sharper detail, previously unknown zones might turn out to be critical habitats or hold clues to past geological events that affected climate and biodiversity. 



Each newly revealed feature expands what is known about oceanic processes.



The aim is not just to tally ridges or canyons. Clearer images allow more thorough interpretations that factor into navigation, resource management, environmental protection, and scientific exploration.



The next few years will likely bring even more refined altimetry missions, advanced sonar methods, and creative approaches that combine all types of datasets. 



Over time, these efforts will build towards an era when the planet’s underwater domain is no longer as cryptic.



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NASA maps Earth's ocean floors from space in stunning detail

The deepest parts of Earth's oceans have mostly remained a...

Shrubs are a key factor in the challenging task of restoring forests after catastrophic wildfires. Beyond planting new tree seedlings, it’s essential to determine when and where to plant for the best chance of success.



Recent research from the <a href="https://www.ucdavis.edu/" target="_blank" rel="noreferrer noopener">University of California, Davis</a> highlights how shrubs can significantly influence the success of forest recovery, acting as both allies and competitors in the regrowth process.



<h2 class="wp-block-heading" id="h-shrubs-competing-with-trees">Shrubs competing with trees </h2>



"Generally, where there are more shrubs, the climate and soil are more hospitable for <a href="https://www.earth.com/news/rising-temperatures-alter-photosynthesis-and-plant-growth/" target="_blank" rel="noreferrer noopener">plant growth</a>," noted Derek Young, the lead author of the research paper. "But what that also means is there’s more competition for trees.”



In regions with higher shrub populations, it seems that planting seedlings within a year of a wildfire might yield the best results. These seedlings will then have a head start before the woody shrubs begin to repopulate the area.



Conversely, in areas where shrubs are scarce, the most effective time to plant is reportedly three years after a fire, which gives soil conditions time to stabilize and recover from the intense heat of the <a href="https://www.earth.com/news/record-breaking-wildfire-years-are-just-getting-started/" target="_blank" rel="noreferrer noopener">wildfire</a>.



<h2 class="wp-block-heading" id="h-the-dual-role-of-shrubs-in-forest-recovery">The dual role of shrubs in forest recovery</h2>



Shrubs often act as ecological engineers, modifying their environment in ways that can either benefit or hinder <a href="https://www.earth.com/news/initiatives-to-plant-billions-of-trees-threatened-by-seedling-undersupply/" target="_blank" rel="noreferrer noopener">tree seedlings</a>. 



On one hand, their roots help stabilize soil and prevent erosion, which is especially vital after a wildfire. 



On the other hand, shrubs compete with tree seedlings for water, nutrients, and sunlight, creating challenging conditions for growth.



This dual role makes it critical to understand the specific ecosystem dynamics before implementing large-scale <a href="https://www.earth.com/news/half-of-plants-used-in-reforestation-projects-do-not-survive/" target="_blank" rel="noreferrer noopener">reforestation</a> efforts.



<h2 class="wp-block-heading" id="h-shrubs-shade-and-tree-growth">Shrubs, shade, and tree growth</h2>



Another interesting insight from the study is that in extremely harsh post-fire conditions, existing plant life might actually support the growth of new tree seedlings.



Shrubs, in particular, can provide shade, which reduces soil temperatures and protects fragile seedlings from excessive sun exposure.



“Some vegetation in those really harsh sites might actually facilitate tree establishment by providing shade,” said Young.



This finding challenges the common assumption that shrubs are always detrimental to tree growth, and suggests that they can play a protective role in certain environments.



<h2 class="wp-block-heading" id="h-optimizing-forest-recovery-after-fires">Optimizing forest recovery after fires</h2>



In a rapidly warming world, understanding how to effectively promote forest recovery is of vital importance.



Wildfires are growing more intense and frequent, leaving vast areas of scorched land in need of restoration.



“We’re aiming to help optimize <a href="https://www.earth.com/news/could-tree-planting-warm-earth-science-behind-albedo-effect/" target="_blank" rel="noreferrer noopener">tree planting</a> by targeting it to where it’s really needed. Doing this matters because we’re facing a reforestation backlog – limited capacity to replant and a lot of severely burned area,” explained study senior author Andrew Latimer.



This research provides a roadmap for making more strategic decisions about where, when, and how to plant trees in wildfire-affected areas.



<h2 class="wp-block-heading" id="h-learning-from-the-past-to-guide-the-future">Learning from the past to guide the future</h2>



The team’s study involved an extensive survey of areas in California’s Sierra Nevada, representing a range of climates and management strategies. 



These regions were replanted with conifer tree seedlings one to three years after experiencing intense wildfires.



To gather data, the researchers created circular plots measuring 400 square meters, including both replanted and non-planted areas. 



By meticulously counting seedlings, measuring shrub cover, and analyzing environmental variables, the team was able to quantify how different factors influence forest composition and tree survival rates.



<h2 class="wp-block-heading" id="h-mapping-the-path-to-recovery">Mapping the path to recovery</h2>



One of the most fascinating outcomes of the study is the development of predictive models that allow researchers to map where trees are likely to thrive post-wildfire.



“Now we have quantified the effects of certain environmental variables that allow us to make those maps,” Young said.



Future experiments will explore the effects of removing shrubs two years after a fire to observe how it influences tree regeneration. 



The team also plans to use drones and aerial imagery to monitor wildfire sites and assess the long-term impact of various management strategies over the past four decades.



<h2 class="wp-block-heading" id="h-balancing-the-future-of-forest-management">Balancing the future of forest management</h2>



As wildfires continue to reshape landscapes across the globe, balancing the role of shrubs in forest recovery becomes increasingly important. 



While shrubs may initially seem like obstacles, they can also serve as partners in reforestation, especially in areas with extreme environmental conditions.



This research provides valuable insights for land managers, conservationists, and policymakers working to restore forests in the era of climate change.



By understanding the complex interplay between shrubs and trees, we can create more resilient and sustainable ecosystems for the future.



The full study was published in the journal <a href="https://www.sciencedirect.com/science/article/abs/pii/S0378112724006583?via%3Dihub" target="_blank" rel="noreferrer noopener">Forest Ecology and Management</a>.



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Shrubs play a dual role in forest recovery following wildfires

Shrubs are a key factor in the challenging task of...

Sleep is essential for restoring the body and mind. It's a time when memories take root and the brain processes the day’s experiences.



While the link between sleep and memory consolidation is well-documented, researchers at Northwestern Medicine have uncovered a surprising player in this intricate process: breathing.



Often dismissed as an automatic function, breathing actually orchestrates memory consolidation through its interaction with hippocampal brain waves, which are rhythmic electrical activities critical for memory storage.



This discovery reveals a fascinating connection between the timing of our breaths and the synchronization of these brain waves during sleep. According to the study authors, this connection is akin to a conductor directing a symphony orchestra.



<h2 class="wp-block-heading" id="h-breathing-the-conductor-of-brain-waves">Breathing: The conductor of brain waves</h2>



The novel study, conducted at <a href="https://www.feinberg.northwestern.edu/index.html" target="_blank" rel="noreferrer noopener">Northwestern University Feinberg School of Medicine</a>, has identified a direct link between breathing rhythms and three key hippocampal brain waves: slow waves, spindles, and ripples.



These oscillations, previously thought to occur randomly, are now known to synchronize with specific points in the breathing cycle.



“To strengthen memories, three special neural oscillations emerge and synchronize in the hippocampus during sleep, but they were thought to come and go at random times,” explained study senior author Professor Christina Zelano. “We discovered that they are coordinated by <a href="https://www.earth.com/news/how-breathing-impacts-memory-formation-during-sleep/" target="_blank" rel="noreferrer noopener">breathing</a> rhythms.”



<h2 class="wp-block-heading" id="h-unraveling-the-mystery-of-memory-consolidation">Unraveling the mystery of memory consolidation</h2>



Memory consolidation, the process by which the brain strengthens and organizes information from the day, has long fascinated scientists. 



Study co-author Andrew Sheriff, a postdoctoral student in Christina Zelano’s lab, noted that the study sheds light on a critical yet overlooked aspect of memory storage: the role of breathing.



“Memory consolidation relies on orchestration of brain waves during sleep, and we show that this process is closely timed by breathing,” Sheriff said.



The <a href="https://www.earth.com/news/sleep-reboots-the-brain-making-room-for-new-memories/" target="_blank" rel="noreferrer noopener">hippocampus</a> is a crucial part of the brain responsible for memory and spatial navigation. It uses these oscillations to replay and organize the day’s experiences. Sheriff related this activity to his personal experience of becoming familiar with navigating a new city.



“The hippocampus plays a major role in forming a map of a new area. I would wake up and feel I had a better representation of the city around me. That was facilitated by the oscillations that occurred during my sleep, which we found are coordinated by breathing,” said Sheriff.



<h2 class="wp-block-heading" id="h-the-implications-of-disordered-breathing">The implications of disordered breathing</h2>



The findings carry significant implications for individuals with sleep-disordered breathing, such as <a href="https://www.earth.com/news/obstructive-sleep-apnea-speeds-up-aging-on-a-cellular-level/" target="_blank" rel="noreferrer noopener">sleep apnea</a>. 



Disruptions to the regular rhythm of breathing during sleep are associated with poor memory consolidation and can increase the risk of neurodegenerative conditions.



“When you don’t get sleep, your brain suffers, your cognition suffers, you get foggy,” Sheriff said. “We also know that sleep-disordered breathing is connected with <a href="https://www.earth.com/news/millions-of-americans-are-at-risk-of-a-stroke-from-intense-exercise/" target="_blank" rel="noreferrer noopener">stroke</a>, dementia, and neurodegenerative disorders.”



This research highlights the importance of seeking treatment for disrupted sleep breathing. 



“If you listen to someone breathing, you might be able to tell when they are asleep, because breathing is paced differently when you’re sleeping,” said Sheriff. “One reason for that may be that breathing is performing a careful task: coordinating brain waves that are related to memory.”



<h2 class="wp-block-heading" id="h-the-link-between-memory-and-sleep">The link between memory and sleep</h2>



The link between sleep and memory has fascinated scholars for centuries. Ancient Roman scholar Quintillion once observed: “The interval of a single night will greatly increase the strength of the memory.”



This phenomenon, now known as memory consolidation, is a carefully tuned process involving hippocampal oscillations that modern science has begun to unravel.



“When you’re sleeping, your brain is actively replaying experiences you had during the day,” Sheriff explained. 



This replay, which is orchestrated by breathing rhythms, strengthens neural connections and reinforces learning.



<h2 class="wp-block-heading" id="h-prioritizing-sleep-health">Prioritizing sleep health</h2>



The study is a wake-up call for individuals experiencing <a href="https://www.earth.com/news/children-who-watch-screens-in-bed-have-the-most-disrupted-sleep/" target="_blank" rel="noreferrer noopener">sleep disruptions</a>. Proper breathing during sleep is not just essential for physical health, but also for maintaining cognitive performance.



Disordered breathing, such as in sleep apnea, can disrupt the rhythm necessary for memory consolidation and increase the risk of neurodegenerative conditions like Alzheimer’s disease, dementia, and stroke.



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



This research, titled “Breathing orchestrates synchronization of sleep oscillations in the human hippocampus,” represents a collaborative effort by scientists at Northwestern University. 



The team included Guangyu Zhou, Justin Morgenthaler, Christopher Cyr, Katherina K. Hauner, Mahmoud Omidbeigi, Joshua Rosenow, Stephan Schuele, and Gregory Lane. 



The findings mark a significant step in understanding the hidden mechanisms of memory consolidation.



As science continues to uncover the intricate interplay between sleep, breathing, and memory, this study serves as a powerful reminder of the profound impact of seemingly simple physiological processes on our cognitive health.



The full study was published in the journal <a href="https://www.pnas.org/doi/10.1073/pnas.2405395121">Proceedings of the National Academy of Sciences</a>.



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Breathing coordinates brain waves for memory storage during sleep

Sleep is essential for restoring the body and mind. It's...

Ground squirrels are commonly associated with their diet of nuts, seeds, and grains, but a groundbreaking new study reveals an unexpected twist in their behavior.&nbsp;



Researchers from the University of Wisconsin-Eau Claire and the <a href="https://www.ucdavis.edu/" target="_blank" rel="noreferrer noopener">University of California, Davis</a>, have discovered that California ground squirrels also hunt, kill, and eat voles.&nbsp;



This surprising finding, published in the <a href="http://dx.doi.org/10.1007/s10164-024-00832-6" target="_blank" rel="noreferrer noopener">Journal of Ethology</a>, marks the first documented evidence of widespread carnivorous behavior among squirrels.



The findings fundamentally challenge long-held assumptions about California ground squirrels as primarily granivorous. Instead, the study suggests that these animals are opportunistic omnivores, capable of adjusting their diet to include meat when the opportunity arises.



<h2 class="wp-block-heading" id="h-a-shocking-discovery-of-carnivorous-squirrels">A shocking discovery of carnivorous squirrels</h2>



The surprising observations occurred in 2024 during the 12th year of the Long-term Behavioral Ecology of California Ground Squirrels Project at Briones Regional Park in Contra Costa County.&nbsp;



Study lead author Jennifer E. Smith is an associate professor of biology at UW-Eau Claire who co-leads the project with Sonja Wild of UC Davis.&nbsp;



Over the course of June and July, the researchers recorded 74 interactions between squirrels and <a href="https://www.earth.com/news/prairie-voles-can-form-bonds-without-oxytocin/">voles</a>, 42% of which involved active hunting by the squirrels.



“This was shocking,” said Professor Smith. “We had never seen this behavior before. Squirrels are one of the most familiar animals to people. We see them right outside our windows; we interact with them regularly.”&nbsp;



“Yet here’s this never-before-encountered in science behavior that sheds light on the fact that there’s so much more to learn about the natural history of the world around us.”



Even for Wild, a seasoned observer of ground <a href="https://www.earth.com/news/climate-change-affects-ground-squirrels-in-unexpected-ways/" target="_blank" rel="noreferrer noopener">squirrels</a>, the behavior was initially hard to believe.&nbsp;



When undergraduate students first reported seeing squirrels hunting voles, Wild admitted skepticism. “No, I’m not sure what you’re referring to,” she said, until she watched the video evidence.



“I could barely believe my eyes,” Wild recounted. “From then, we saw that behavior almost every day. Once we started looking, we saw it everywhere.”



<h2 class="wp-block-heading" id="h-opportunists-in-a-changing-landscape">Opportunists in a changing landscape</h2>



The study documented squirrels of all ages and genders hunting and consuming voles, often competing over the prey. This behavior peaked in early July, coinciding with a sudden increase in vole populations reported by citizen scientists on <a href="https://www.inaturalist.org/" target="_blank" rel="noreferrer noopener">iNaturalist</a>.&nbsp;



Interestingly, the researchers observed squirrels hunting only voles and no other mammals, suggesting that the behavior arose in response to the temporary abundance of this particular prey.



Wild emphasized the adaptability of California ground squirrels in the face of environmental changes.&nbsp;



“The fact that California ground squirrels are behaviorally flexible and can respond to changes in food availability might help them persist in <a href="https://www.earth.com/news/animal-learning-speed-keeping-pace-with-a-changing-environment/" target="_blank" rel="noreferrer noopener">environments</a> rapidly changing due to the presence of humans.”



Smith echoed this sentiment, pointing to the broader trend of mammals adapting to human-altered landscapes.&nbsp;



“Many species, including the California ground squirrel, are incredible opportunists,” she said. “From raccoons and coyotes to spotted <a href="https://www.earth.com/news/friendly-hyenas-more-likely-to-engage-in-mobbing-behavior/" target="_blank" rel="noreferrer noopener">hyenas</a> and humans, the flexibility these mammals apply to their hunting strategies helps them change and adapt with the human landscape.”



<h2 class="wp-block-heading" id="h-questions-for-future-research">Questions for future research</h2>



While the discovery sheds new light on ground squirrel behavior, it raises numerous questions about the ecological and evolutionary implications of their hunting habits. The researchers are particularly curious about how widespread this behavior is among other squirrel populations and whether it is learned or instinctual.



“Through this collaboration and the data coming in, we’re able to document this widespread behavior that we had no idea was going on,” Smith said. “Digital technology can inform the science, but there’s no replacement for going out there and witnessing the behavior because what animals are doing always surprises us.”



The team also plans to investigate whether vole hunting has any impact on squirrel reproduction, comparing data from this year to the previous decade.



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



This discovery of carnivorous behavior in California ground squirrels adds a fascinating layer to our understanding of a species we thought we knew well. It demonstrates not only the behavioral flexibility of these animals but also highlights the value of direct observation and collaboration in scientific research.



The findings suggest that even the most familiar animals can surprise us with behaviors that challenge established assumptions. As researchers prepare for next year’s field season, they remain eager to uncover what other secrets these seemingly ordinary squirrels might reveal.



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First evidence of carnivorous squirrels documented in California

Ground squirrels are commonly associated with their diet of nuts,...

A recent study highlights a critical challenge for coral reproduction in the face of climate change. Led by Professor Peter Mumby from The University of Queensland, the research found that corals must be within a few meters of each other to reproduce successfully.



This surprising discovery has significant implications for coral survival, as warming oceans and other climate impacts continue to decimate reefs.



<h2 class="wp-block-heading" id="h-factors-in-coral-reproduction">Factors in coral reproduction</h2>



The research team measured the success of a natural <a href="https://www.earth.com/news/ai-illuminates-fish-interactions-in-coral-reefs/" target="_blank" rel="noreferrer noopener">coral spawning</a> event in March this year. 



“In what came as a surprise, we saw that corals needed to be within 10 metres (32.8 feet) of one another, and preferably closer than that for fertilization to take place,” explained Professor Mumby.



The team’s findings revealed a stark reality. Fertilization rates averaged 30% when corals were very close to each other. However, this figure dropped to less than 10% at a separation of 10 meters (32.8 feet) and was virtually zero at distances beyond 20 meters (65.6 feet).



“We knew corals couldn’t be too far apart, but we found they need to be closer than we’d expected,” noted Professor Mumby.



“Climate change impacts like bleaching are killing and reducing the density of corals, so we’re concerned that individuals may end up too far apart to reproduce successfully.”



<h2 class="wp-block-heading" id="h-importance-of-proximity-in-coral-reproduction">Importance of proximity in coral reproduction</h2>



The research team set up their experiment on a <a href="https://www.earth.com/news/coral-seeding-increases-resistance-to-extreme-heatwaves/" target="_blank" rel="noreferrer noopener">reef</a> in Palau, Micronesia. They placed containers above 26 coral colonies during a spawning event, capturing eggs and allowing sperm from nearby corals to enter the containers.



“The containers captured some of each corals’ eggs and drifted to the surface where they followed the tide,” said Professor Mumby.



“Although the eggs could not escape, sperm could enter the container and fertilize the eggs. After an hour of drifting, the proportion of fertilized eggs was noted for each type of coral, along with the distance to similar established corals.”



The results demonstrated the importance of proximity among <a href="https://www.earth.com/news/coral-reefs-in-some-parts-of-the-world-actually-benefit-from-warming-el-nino-events/" target="_blank" rel="noreferrer noopener">corals</a> for successful reproduction.



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



The findings from <a href="https://www.uq.edu.au" target="_blank" rel="noreferrer noopener">The University of Queensland</a> highlight how climate change exacerbates challenges for <a href="https://www.earth.com/news/multivitamins-could-save-coral-reefs-from-climate-destruction/" target="_blank" rel="noreferrer noopener">coral populations</a>. Bleaching events and other stressors not only kill corals but also reduce their density, making reproduction increasingly difficult.



Dr. Christopher Doropoulos from <a href="https://www.csiro.au/en/" target="_blank" rel="noreferrer noopener">CSIRO</a>, a co-author of the study, emphasized the importance of coral reproduction for population resilience and evolution.



“In the future, we may need to help corals continue this key part of their lives,” said Dr. Doropoulos. “Understanding the importance of local neighbourhoods provides tangible targets for interventions like coral restoration.”



<h2 class="wp-block-heading" id="h-restoration-efforts-and-future-directions">Restoration efforts and future directions</h2>



Coral restoration emerges as a vital strategy to combat this reproductive challenge. 



“Ideally, the density of corals would be monitored at important locations and restoration carried out to return the density back to the levels required for successful reproduction,” Dr. Doropoulos added.



Professor Mumby highlighted the significance of ongoing <a href="https://www.earth.com/news/coral-reefs-could-vanish-if-temperatures-continue-to-rise/" target="_blank" rel="noreferrer noopener">restoration</a> efforts. 



“Our work over the past 5 years on the Great Barrier Reef through the Reef Restoration and Adaptation Program is also helping to define these critical thresholds to help restoration practitioners set targets for density to help maintain coral populations,” said Professor Mumby.



The study, funded by the McCusker Foundation and the Australian Government’s Reef Restoration &amp; Adaptation Program, provides actionable insights for coral conservation. 



By identifying critical density thresholds, researchers hope to guide interventions that can enhance coral reproduction and resilience.



<h2 class="wp-block-heading" id="h-hope-amidst-challenges">Hope amidst challenges</h2>



This research highlights how vulnerable coral populations are, and emphasizes the critical need for focused <a href="https://www.earth.com/news/60-percent-global-coral-reefs-face-bleaching-rising-temperatures/" target="_blank" rel="noreferrer noopener">conservation</a> efforts.



Climate change, through factors like ocean warming and bleaching, is making coral survival increasingly difficult. However, studies like this provide essential insights for scientists and conservationists to better protect coral reefs. 



The key finding - that corals need to be close to each other for reproduction - can guide efforts to ensure they remain healthy and viable. If corals are not able to reproduce due to greater distances between them, it could lead to the <a href="https://www.earth.com/news/the-worlds-largest-coral-bleaching-event-is-now-underway/" target="_blank" rel="noreferrer noopener">decline of these vital ecosystems</a>.



Ensuring corals are sufficiently close for successful reproduction is therefore crucial in maintaining and preserving coral reefs for the future.



The study is published in the journal <a href="https://www.pnas.org/doi/full/10.1073/pnas.2418314121" target="_blank" rel="noreferrer noopener">Proceedings of the National Academy of Sciences</a>.



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Corals count on nearby neighbors for successful reproduction

A recent study highlights a critical challenge for coral reproduction...

You may have come across axolotls - those smiling amphibians with pink, plume-like gills - in pet stores, as plush toys, or even featured in video games. 



Yet, their growing presence in popular culture has emerged just as the wild population of this remarkable species faces critical endangerment.



<h2 class="wp-block-heading" id="h-axolotls-have-become-a-cultural-icon">Axolotls have become a cultural icon</h2>



James Monaghan, a biology professor at <a href="https://www.northeastern.edu/" target="_blank" rel="noreferrer noopener">Northeastern University</a>, has long studied axolotls and their extraordinary regenerative capabilities. “Axolotls have just exploded in popularity the past couple of years,” he said. 



Monaghan recalled that when he began his PhD studies, the general public had little idea what an axolotl was.&nbsp;



“No one knew in the general public what an axolotl was, so I'd have to explain,” he remembered, contrasting that with today’s situation: “Now I just can say, 'Oh, I work on axolotls,' and everyone just lights up.”



Monaghan noted that young people, in particular, have been drawn to axolotls, most likely due to their aesthetic charm.&nbsp;



“They're pink, they have feathers,” he said. “Well, they don't really have feathers, but their gills are feathery. They have a constant little smile on their face. If you were to create a cute animal that you couldn't think existed naturally, it's kind of the axolotl. It's got the vibes of a dragon, but a nice dragon.”



<h2 class="wp-block-heading" id="h-from-ancient-roots-to-gaming-stardom">From ancient roots to gaming stardom</h2>



The axolotl is no newcomer to cultural significance. “It's named after an Aztec god, Xolotl,” Monaghan explained, referencing its deep ties to Mexican heritage. Initially found in Lake Xochimilco near Mexico City, this <a href="https://www.earth.com/news/over-40-of-amphibians-face-extinction-due-to-escalating-climate-threats/" target="_blank" rel="noreferrer noopener">amphibian</a>’s recent surge in popularity has transcended borders.



Its presence in mainstream culture can be traced in part to its introduction into the world of Minecraft, a <a href="https://www.earth.com/news/how-violent-video-games-impact-the-human-mind/" target="_blank" rel="noreferrer noopener">video game</a> of immense popularity.&nbsp;



“Minecraft is enormously popular for young players. The game allows for social play, exploration, sandbox style play where you can make anything,” said Northeastern assistant professor of computer science Alexandra To. By featuring axolotls, the game inspires curiosity and a desire to learn.&nbsp;



“Minecraft provides players great intrinsic motivation to discover more about any new elements that are added to the game,” To added.



In some cases, this might involve players constructing elaborate environments to house every in-game creature. “As my own partner did, in embarking on a project to create an enormous zoo with every in-world animal,” she remarked.



Monaghan suggests that axolotls may have also influenced other media. “I don't know if it's actually the motivation for 'How To Train Your Dragon,'” he said, pointing out that the character Toothless resembles an axolotl with its perpetual smile and ear-like flaps suggesting feathery gills.



<h2 class="wp-block-heading" id="h-scientific-significance-of-axolotls-nbsp">Scientific significance of axolotls&nbsp;</h2>



While their looks and cultural presence have captured public affection, axolotls are scientifically remarkable as well. Their regenerative powers extend beyond limbs. Monaghan’s lab has found that they can regenerate a large portion or their lung.&nbsp;



“They are notoriously resistant to <a href="https://www.earth.com/news/ai-is-the-next-frontier-in-cancer-treatment/" target="_blank" rel="noreferrer noopener">cancers</a>, never get infections after an injury,” he said, and can live for up to two decades - qualities that have made them valuable subjects of study for generations.



“Axolotls are the longest standing lab animal of any animal, longer than flies, longer than worms, longer than mice,” Monaghan said. First collected in 1864 from Lake Xochimilco, their initial appeal stemmed from their unusual, fully aquatic life cycle.&nbsp;



Over time, they became critical for studies on genetics, development, and <a href="https://www.earth.com/news/study-sheds-light-on-the-pathways-of-plant-regeneration/" target="_blank" rel="noreferrer noopener">regeneration</a>. With modern genetic tools like CRISPR, researchers can now pinpoint which genes drive their regenerative capabilities.



All lab and pet axolotls today descend from that original 19th-century population, and this lineage includes the distinct white axolotl familiar to fans worldwide.&nbsp;



“The white axolotl, which seems to be pretty much every stuffed animal that's out there, is actually a mutation of a single animal that was collected in 1864,” Monaghan explained. “You can get color variants, but the pink variety - that's from one founding animal.”



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



As axolotls capture hearts around the globe, their wild counterparts hover on the brink of extinction. Once, locals could easily scoop them from Lake Xochimilco’s waters.&nbsp;



“Maybe up to the 1950s, you could put a net in Lake Xochimilco, the canal system, and pull up adult axolotls. And then every decade since, it's just crashed,” Monaghan said. “To the point now that they're critically endangered, and it takes weeks to even find one.”



They are exquisitely sensitive to environmental changes. “Being an amphibian, you're at the whim of your environment. You're taking in everything through your water,” he explained.&nbsp;



Climate change warms these waters, making survival harder, while pollution and introduced species further destroy fragile habitats and devour axolotl eggs.



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



Given their success in captivity, one might assume we could simply return these lab and pet lineages to Lake Xochimilco. But it’s not that simple.&nbsp;



“It's probably not the best strategy to take a species that's been inbred since 1864 and reintroduce it into its natural habitat,” Monaghan said.&nbsp;



The modern axolotl has adapted to controlled conditions, while its original environment has changed drastically.&nbsp;



“We can't take the current axolotl and put it into the environment in Mexico City and expect them to thrive the same way as the original collection in 1864. The environment's changed, but the animals themselves have changed.”



Still, rising awareness may help efforts to protect the axolotl’s wild habitat. According to To, the team behind Minecraft has embraced conservation as part of its mission.&nbsp;



“Mojang has been pretty transparent about conservation as one of their core values,” she explained. “The inclusion of axolotls and their in-game rareness mirroring their real-world endangered status is a fantastic example of how game mechanics can reinforce educational messages.”



Monaghan is involved as well, serving on the advisory board of the Ambystoma Genetic Stock Center to support both scientific understanding and conservation. “Those direct efforts could really go a long way toward saving the axolotl,” he said.



All this attention suggests that the axolotl’s time has arrived. “All of a sudden, it seems to be absolutely everywhere,” Monaghan said.&nbsp; Yet, for all the joy and fascination these creatures provide, the work to secure their future in the wild is only just beginning.



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Axolotls have exploded in popularity, but they are fighting for survival

You may have come across axolotls - those smiling amphibians...

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



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



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



Video/ Image Credit: ESA



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

Nushagak Bay in southwest Alaska

[sendtonews key="0ynNMYkMKa-2340414-12187" type="single"] Today’s Video of the Day from the...

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



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



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



Video/ Image Credit: American Chemical Society&nbsp;



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



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

Flu viruses are more flexible than expected

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

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



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



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



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



Video/Image Credit: ESA&nbsp;



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

Lake Trasimeno in Central Italy

[sendtonews key="3upvlAaHgO-2256633-12187" type="single"] Today’s Video of the Day from the...

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



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



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



Video Credit: American Chemical Society&nbsp;



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



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

Detecting mercury contamination with the tap of a finger

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



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



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



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



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



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



Video/ Image Credit: European Space Agency&nbsp;



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



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

Kainji Lake in north central Nigeria

[sendtonews key="iuA5mpp3jv-1641775-12187" type="single"] Today’s Video of the Day from the...

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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...

According to the original caption for this image from circa 1900 in Mobile, Alabama, the doctors and nurses are about to operate on the patient on the table. You’ll notice that none of the medical staff are wearing either masks or gloves, although the headgear of two of the nurses is fairly extraordinary. Ideas about sterile environments a century and more ago were not what we’d call rigorous. Photo Credit: Hulton Archive/Getty Images

Operating theater

Proving that the South wasn’t just about cotton and sharecropping, this group of men photographed in 1890 worked at a pig iron plant in Ensley, near Birmingham, Alabama. The three blast furnaces at the foundry where they worked produced some 200 tons of ferrous material from ore each day. The city was named after Enoch Ensley, an industrialist who used his large inheritance to develop extensive coal and iron interests. Photo Credit: Hulton Archive/Getty Images