Today's Image of the Day from the European Space Agency features a Copernicus Sentinel-2 photograph of Lake Maracaibo, located in the northwestern part of Venezuela. The lake is a significant geographical and ecological feature of South America. 



Lake Maracaibo is often considered more of a tidal bay due to its direct connection to the Caribbean Sea through the Tablazo Strait. It is one of the oldest lakes on Earth, formed approximately 36 million years ago.



"With an area of over 13,000 sq km, Lake Maracaibo is generally considered the largest lake in South America, although by some estimates it should be considered an inlet of the Caribbean Sea since much of its water is brought in by its direct connection to the ocean," explained <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



"As a result, the water in the northern part of the lake is rather brackish, while the southern waters are fresh, owing to the many rivers that flow into the lake. The biggest, the Catatumbo River, can be seen entering the lake from southwest, where a large amount of sediment carried by the river appears as a yellowish plume."



<h2 class="wp-block-heading" id="h-the-catatumbo-lightning">The Catatumbo lightning</h2>



The lake is renowned for a unique weather phenomenon - the Catatumbo lightning. This natural spectacle occurs primarily where the Catatumbo River meets the <a href="https://www.earth.com/news/wildfire-smoke-has-affected-almost-every-lake-in-north-america/" target="_blank" rel="noreferrer noopener">lake</a>.



Known as the most persistent lightning storm in the world, it produces frequent and dramatic flashes of lightning, illuminating the night sky for an average of 260 nights per year.



These storms generate thousands of lightning strikes in a single night, making the region one of the most electrified places on the planet. 



The phenomenon is so intense that it has been recognized by the Guinness World Records as the place with the highest <a href="https://www.earth.com/news/lightning-on-earth-can-influence-the-weather-in-space/" target="_blank" rel="noreferrer noopener">lightning</a> activity.



Scientists believe the lightning is influenced by the area's geography and climate, including the warm air rising from the lake and its surrounding mountains.



<h2 class="wp-block-heading" id="h-economical-significance-of-lake-maracaibo">Economical significance of Lake Maracaibo </h2>



Lake Maracaibo plays an important role in Venezuela’s economy, as it lies atop vast reserves of crude oil.



The discovery of petroleum in the early 20th century transformed the region into a major oil-producing area, leading to the establishment of numerous oil rigs and platforms. 



However, this economic activity has come at a cost. <a href="https://www.earth.com/news/half-of-the-worlds-largest-lakes-are-losing-their-resilience/" target="_blank" rel="noreferrer noopener">Pollution</a> from oil spills, industrial waste, and agricultural runoff has significantly degraded the lake's ecosystem.



The appearance of a green, slimy algae known as Lemna has further exacerbated environmental concerns, threatening marine life and the livelihoods of local communities.



<h2 class="wp-block-heading" id="h-cultural-ties-to-lake-maracaibo">Cultural ties to Lake Maracaibo </h2>



The cultural significance of Lake Maracaibo is deeply rooted in the traditions and lifestyle of the Indigenous Añu people, who have inhabited its shores for centuries. The Añu, also known as Paraujano, are known for their distinctive stilt houses, called palafitos.



These wooden structures are built directly over the water, connected by walkways or small boats, allowing the Añu to live harmoniously with their aquatic environment. The architectural style of these stilt houses inspired the early Spanish explorers to nickname the region "The Venice of the Americas."



The Añu's way of life is closely tied to the lake. They rely on <a href="https://www.earth.com/news/sustainable-fishing-must-be-redefined-to-halt-ocean-destruction/" target="_blank" rel="noreferrer noopener">fishing</a> as a primary source of food and income, using traditional methods passed down through generations.



For the Añu, the <a href="https://www.earth.com/news/wildfire-smoke-significantly-impacts-lake-ecosystems/" target="_blank" rel="noreferrer noopener">lake</a> is more than a resource; it is a spiritual and cultural cornerstone, shaping their identity and daily practices.



However, modernization and environmental challenges have disrupted their traditional lifestyle. The oil industry’s expansion around Lake Maracaibo has led to significant environmental degradation, which threaten the lake's biodiversity and the Añu’s primary sources of sustenance. 



<h2 class="wp-block-heading" id="h-lake-maracaibo-and-venezuelan-history">Lake Maracaibo and Venezuelan history</h2>



Lake Maracaibo also played a pivotal role in Venezuelan history, particularly during the Battle of Lake Maracaibo in 1823. 



This naval battle was a decisive conflict in Venezuela’s war for independence from Spain and marked one of the final military engagements of the South American liberation movements led by figures like Simón Bolívar.



Today, the lake represents a remarkable blend of natural beauty, industrial significance, and cultural heritage. 



<h2 class="wp-block-heading" id="h-ongoing-conservation-efforts">Ongoing conservation efforts </h2>



Ongoing efforts aim to harmonize ecological conservation with economic development, as both local and global stakeholders acknowledge the need to protect this extraordinary environment for generations to come.



Efforts to preserve the Añu culture and the lake's ecosystem have been initiated by local and international organizations. These initiatives focus on promoting sustainable development, preserving Indigenous languages and traditions, and mitigating the environmental damage caused by industrial activities. 



Despite these challenges, the Añu have shown remarkable resilience, maintaining their cultural identity and advocating for their rights and the health of their ancestral lands.



Image Credit: ESA



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



—--



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

Lake Maracaibo: One of the most electrified places on the planet

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

Today's Image of the Day from NASA Earth Observatory features a satellite view of retreating glaciers in Alaska, where meltwater is rapidly expanding glacial lakes. The image was captured on August 4, 2024 by the Landsat 8 satellite.



“In parts of Alaska, water is replacing ice. As glaciers thin and <a href="https://www.earth.com/news/satellite-images-reveal-hidden-retreat-of-arctic-glaciers/" target="_blank" rel="noreferrer noopener">retreat</a>, meltwater collects at their fronts, forming proglacial lakes. According to an analysis by Mauri Pelto, a glaciologist at Nichols College, three such lakes in the southeastern part of the state have grown rapidly in recent decades,” said <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>.



<h2 class="wp-block-heading" id="h-retreating-glaciers-in-alaska">Retreating glaciers in Alaska</h2>



“A trio of glaciers - Yakutat, Alsek, and Grand Plateau - descend from inland mountains and flow onto the coastal plain southeast of Yakutat borough, ending at Harlequin Lake, Alsek Lake, and Grand Plateau Lake,” noted NASA.&nbsp;



The retreat of the glaciers, as well as the growth of the lakes, are visible in the image. When compared to an <a href="https://eoimages.gsfc.nasa.gov/images/imagerecords/153000/153638/fastestlake_tm5_19840705_lrg.jpg" target="_blank" rel="noreferrer noopener">image</a> captured by Landsat 5 in the summer of 1984, the changes are even more evident.



NASA elaborated on the extent of the glacier retreat from 1984 to 2024. “During this period, Yakutat Glacier’s main arm retreated 4.3 miles, while Alsek Glacier’s northern and southern arms retreated 3.3 miles and 3.4 miles, respectively. Grand Plateau Glacier’s northern arm lost the most, retreating 4.8 miles.”



<h2 class="wp-block-heading" id="h-glacial-lakes-doubled-in-size-nbsp">Glacial lakes doubled in size&nbsp;</h2>



“Collectively, the three lakes more than doubled in size over 40 years. In 1984, they covered about 50 square miles. By 2024, they spanned 90 square miles. That’s an area larger than Seneca Lake (67 square miles) - one of the Finger Lakes in New York, which also have a glacial origin,” said NASA.



Pelto noted that the lakes forming in this region are immense - starting at the mountains and spreading toward the coast - making this a new lake district that is unique in our nation.



“Millions of other lakes, named and unnamed, dot the state. But this system has grown fast, so much so that Pelto thinks it might represent the fastest lake growth in the United States this century,” said NASA.



<h2 class="wp-block-heading" id="h-understanding-glacier-retreat-nbsp">Understanding glacier retreat&nbsp;</h2>



Glacier retreat is a significant phenomenon driven primarily by global warming the results from rising greenhouse gas <a href="https://www.earth.com/news/global-carbon-dioxide-emissions-hit-a-record-high-in-2023/" target="_blank" rel="noreferrer noopener">emissions</a>.&nbsp;



As temperatures rise, glaciers lose more ice during the summer melt than they can regain in winter snowfall, causing them to shrink over time. This process has profound implications for ecosystems, water resources, and global sea levels.



<h3 class="wp-block-heading" id="h-glacial-lakes">Glacial lakes</h3>



When glaciers retreat, they often leave behind depressions in the landscape that can fill with meltwater, forming glacial lakes. These lakes are typically bounded by natural dams made of rock, ice, or moraine - accumulations of debris left behind by the glacier's movement.&nbsp;



Over the past century, the number and size of glacial lakes worldwide have increased significantly due to the accelerating pace of <a href="https://www.earth.com/news/tropical-glaciers-offer-a-glimpse-of-our-harsh-climate-reality/" target="_blank" rel="noreferrer noopener">glacier</a> retreat. This trend is especially evident in high-altitude regions like the Himalayas, the Andes, and the Alps, as well as in polar areas such as Alaska and Greenland.



<h3 class="wp-block-heading" id="h-positive-and-negative-impacts-nbsp">Positive and negative impacts&nbsp;</h3>



Glacial lakes can have both positive and negative impacts. They provide critical water sources for downstream communities, support biodiversity, and sometimes offer opportunities for hydropower development or tourism.&nbsp;



However, they also pose serious risks. The dams holding back these lakes can fail suddenly, causing glacial lake outburst floods (GLOFs). These catastrophic events can devastate downstream areas, destroying infrastructure, agricultural lands, and habitats while endangering human lives.



<h3 class="wp-block-heading" id="h-monitoring-changes">Monitoring changes</h3>



Understanding glacier retreat and glacial lake formation requires a multidisciplinary approach, combining climate science, hydrology, and geology.&nbsp;



Monitoring these changes is essential to mitigate associated risks and adapt to the evolving landscape shaped by a <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fperu-has-lost-over-half-of-its-glaciers-in-six-decades%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">warming planet</a>.



<h2 class="wp-block-heading" id="h-glacier-retreat-worldwide">Glacier retreat worldwide</h2>



Studies and satellite observations show that most glaciers in almost all regions of the world are shrinking.&nbsp;



Melting glaciers contribute significantly to global <a href="https://www.earth.com/news/emergency-meeting-reveals-the-alarming-extent-of-antarcticas-ice-loss/" target="_blank" rel="noreferrer noopener">sea level rise</a>, which threatens coastal communities and ecosystems.



The retreat of glaciers is considered one of the clearest indicators of climate change.&nbsp;Some glaciers are retreating at unprecedented rates, indicating accelerating climate impacts.



Image Credit: NASA Earth Observatory



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Retreating glaciers and expanding meltwater lakes in Alaska

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

Today's Image of the Day from NASA Earth Observatory features the Gobi Altai Mountains and neighboring plains covered in snow and illuminated by sunlight. 



The photograph was captured on January 25, 2024 as the International Space Station (ISS) passed over central Mongolia.



<h2 class="wp-block-heading" id="h-mountain-peaks-and-plains">Mountain peaks and plains</h2>



“Late-afternoon sunlight casts long shadows of mountain peaks onto the plains below. Numerous steep gullies cut into the massif, or mass of mountains, whose rugged appearance contrasts with the flat plains stretching along the top of the image,” said <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>. “The plains are a semidesert grassland, or steppe, which provides pasture for livestock herders in the region.”



“The grassland surrounding the massif is classified by scientists as a cold semidesert. At an elevation of about 1,250 meters, annual temperatures are much lower there than in the mountains. The highest peak in the massif, Ikh Bogd (also known as Tergun Bogd), reaches nearly 4,000 meters.”&nbsp;



According to NASA, the climate on the peaks is classified as a polar tundra because the average annual temperature is below freezing. "Asia’s main tundra zone is located in Siberia, along the coast of the Arctic Ocean, 2,800 kilometers (1,750 miles) to the north.”



<h2 class="wp-block-heading" id="h-harsh-winters-and-livestock-in-mongolia">Harsh winters and livestock in Mongolia</h2>



Harsh <a href="https://www.earth.com/news/why-winters-are-getting-colder-while-world-is-getting-warmer/" target="_blank" rel="noreferrer noopener">winters</a> in Mongolia, locally known as "dzud," pose significant challenges for livestock and the herders who depend on them for their livelihood. These winters can be particularly severe, characterized by extreme cold, heavy snowfall, and ice, which can block access to grazing grounds, leaving animals without enough food.&nbsp;



The cold temperatures and nutritional shortages result in high mortality rates among livestock, which are crucial to the Mongolian economy and the nomadic lifestyle of many of its people.



The impact of these harsh winters extends beyond immediate animal welfare. As <a href="https://www.earth.com/news/bacteria-in-livestock-are-major-drivers-of-antibiotic-resistance/" target="_blank" rel="noreferrer noopener">livestock</a> numbers dwindle, herders face financial hardships, and the ripple effects can be felt throughout the entire community.&nbsp;



To combat these challenges, various strategies have been employed, including the development of better forecasting and early warning systems, the stockpiling of fodder, and improved veterinary care. These measures aim to strengthen the resilience of herding communities and ensure the survival of their livestock during Mongolia's most challenging seasons.



<h2 class="wp-block-heading" id="h-diverse-wildlife-of-mongolia">Diverse wildlife of Mongolia</h2>



Mongolia is renowned for its diverse wildlife, adapted to its unique landscapes ranging from vast steppes to rugged <a href="https://www.earth.com/news/mountains-both-carbon-sinks-and-carbon-sources/" target="_blank" rel="noreferrer noopener">mountains</a> and arid deserts. Among the most iconic species is the Bactrian camel, native to the region and crucial to nomadic herders.&nbsp;



The resilient Mongolian horse, integral to local culture, is celebrated for its endurance across the vast, open landscapes. Predators such as the snow leopard roam the high altitudes, playing a key role in the ecosystem, while the elusive Gobi bear survives in the sparse vegetation of the Gobi Desert.



The steppes are home to the fast-moving Mongolian gazelle and the critically endangered saiga antelope, known for its distinctive nose. The mountains support populations of argali sheep, the world's largest wild sheep, and the ibex, which has mastered the art of navigating rocky terrains. 



<h2 class="wp-block-heading" id="h-valley-of-lakes">Valley of Lakes</h2>



“Part of a small dry lake appears in the top left of the image. In wetter years, water from this lake feeds Orog Lake (also photographed by astronauts), out of frame to the upper right. This and other nearby lakes are part of the Valley of Lakes waterfowl conservation habitat, protected as a Ramsar site,” noted NASA.



The Valley of Lakes is known for its expansive <a href="https://www.earth.com/news/the-potential-of-tidal-wetlands-as-blue-carbon-ecosystems/" target="_blank" rel="noreferrer noopener">wetlands</a> and diverse ecosystems that support a variety of bird species, especially migratory waterfowl. This area serves as a crucial stopover for birds during their migration periods, providing them with essential resources such as food and shelter.&nbsp;



The conservation efforts in the Valley of Lakes focus on maintaining and restoring these <a href="https://www.earth.com/news/coastal-wetlands-are-inching-closer-to-extinction-as-the-world-heats-up/" target="_blank" rel="noreferrer noopener">wetlands</a> to ensure they continue to offer a safe haven for waterfowl. These efforts include controlling invasive plant species that threaten the natural vegetation and managing water levels to create optimal conditions for bird populations.&nbsp;



Education and community involvement are also key components of the conservation strategy, aiming to raise awareness about the importance of these habitats and encourage sustainable practices that help protect the local wildlife.



Image Credit: NASA Earth Observatory&nbsp;



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Mountain peaks and plains of central Mongolia 

Today's Image of the Day from the European Space Agency features the barred spiral galaxy NGC 1559, located around 35 million light-years away in the southern constellation Reticulum. The image was captured by the James Webb Space Telescope. 



<h2 class="wp-block-heading" id="h-fuel-for-star-formation">Fuel for star formation </h2>



"The data featured in this portrait make use of two of Webb’s instruments: the Mid-InfraRed Instrument (MIRI) and Near-InfraRed Camera (NIRCam)," noted <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



"Here MIRI captures the glow of interstellar dust grains, which trace out the interstellar medium, the fuel for future star formation. NIRCam shows the light from stars, even young stars hidden behind prodigious amounts of dust. NIRCam also captures emission from ionised nebulae around young stars."



<h2 class="wp-block-heading" id="h-webb-reveals-galaxies-in-new-light">Webb reveals galaxies in new light</h2>



According to ESA, the data was collected by the <a href="https://sites.google.com/view/phangs/home">PHANGS team</a> as part of a program in which Webb will observe 55 <a href="https://www.earth.com/news/james-webb-captures-galaxies-that-are-too-old-to-exist/">galaxies</a> that have also been mapped by the Atacama Large Millimeter/submillimeter Array (ALMA) radio telescope, the Hubble Space Telescope, and more.&nbsp;



"By combining Webb’s unprecedented view of the dust and stars with data from these other facilities, the team aims to obtain a new, highly detailed view of how stars are born, live, and die in galaxies across the Universe."



<h2 class="wp-block-heading" id="h-ngc-1559-a-loner-in-space">NGC 1559: A loner in space</h2>



Although NGC 1559 appears to sit close to one of our nearest neighbors in the sky - the Large Magellanic Cloud (LMC) - this is just a trick of perspective, noted ESA.



While it is part of the Reticulum constellation, NGC 1559 is not part of the Local Group of galaxies but instead resides in a more distant region of space.



"In reality, NGC 1559 is physically nowhere near the LMC in space; in fact it truly is a loner, lacking the company of any nearby galaxies or membership of any galaxy cluster."



<h2 class="wp-block-heading" id="h-star-formation-in-ngc-1559">Star formation in NGC 1559</h2>



NGC 1559 is notable for its active star formation and strong magnetic fields. It has also been the site of several <a href="https://www.earth.com/news/supernova-explosions-could-damage-distant-planets/" target="_blank" rel="noreferrer noopener">supernovae</a>, making it of particular interest to astronomers studying stellar evolution and the lifecycle of stars.



The structure of NGC 1559 includes well-defined spiral arms that are rich in young, hot stars and regions of ionized gas, indicative of ongoing <a href="https://www.earth.com/news/black-hole-is-starving-its-host-galaxy-of-star-forming-fuel/" target="_blank" rel="noreferrer noopener">star formation</a>.



The galaxy’s central bar is believed to play a role in driving gas towards the core, fueling both the star formation and the activity around its nucleus.



<h2 class="wp-block-heading" id="h-an-extragalactic-wonder">An extragalactic wonder</h2>



Despite being relatively small compared to larger galaxies like the Milky Way, NGC 1559 is an important object for understanding how barred spiral galaxies evolve and the processes that trigger supernovae.



The galaxy’s remote location and active nature make it a fascinating subject of study in the field of extragalactic astronomy. The isolation of NGC 1559 allows for a clearer view of its structure without much interference from neighboring galaxies.



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



Barred spiral galaxies are a type of spiral galaxy characterized by a central bar-shaped structure composed of stars. This bar extends out from the core and connects to the galaxy's spiral arms, which swirl outward in a graceful pattern.



Scientists believe that the bar plays a crucial role in the evolution of the galaxy, funneling gas towards the core and potentially triggering star formation or feeding a central black hole. 



The <a href="https://www.earth.com/news/newly-discovered-stars-milky-way-are-old-as-universe/" target="_blank" rel="noreferrer noopener">Milky Way</a>, our own galaxy, is an example of a barred spiral. These galaxies are quite common in the universe, making up about two-thirds of all observed spiral galaxies.



The bar itself is thought to be a temporary feature, developing as the galaxy matures and possibly disappearing over time as the dynamics of the stars change. 



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



The Reticulum constellation is a small, faint constellation in the southern sky. Its name means "the reticle" in Latin, which refers to the crosshairs in an eyepiece of a telescope. 



The constellation was named in the 18th century by the French astronomer Nicolas Louis de Lacaille to honor the reticle he used in his scientific instruments. It is one of the 88 modern constellations recognized by the International Astronomical Union.



Image Credit: ESA/Webb, NASA &amp; CSA, A. Leroy, J. Lee and the PHANGS Team



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Spiral galaxy NGC 1559 is a loner in outer space

Today's Image of the Day from the European Space Agency features the barred spiral galaxy NGC 3783, which is located about 130 million light-years away in the constellation Centaurus. 



NGC 3783 is also the most prominent of a galaxy group (by the same name) that contains 47 galaxies. 



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



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



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



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



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



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



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



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



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



<a href="https://www.earth.com/news/dark-stars-scientists-discover-a-new-type-of-star-powered-by-dark-matter/" target="_blank" rel="noreferrer noopener">Stars</a> like HD 101274 are important for astronomers because they help in studying the properties of stellar populations in clusters and the dynamics of stellar evolution in different environments. 



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



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



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



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



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



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



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



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



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



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



Image Credit: ESA/Hubble &amp; NASA



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Luminous galaxy NGC 3783 and a blue giant star

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;



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

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

Brutal fire season continues in California. Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> shows late-autumn fires burning southeast of Los Angeles. Large burn scars from earlier this year are also visible in the photograph.

California's fire season typically ends in October, but global warming has increased the risk for fires in the fall season.

Despite the previous fires, enough brush and vegetation remains to fuel the new fires. According to NASA, strong Santa Ana winds with gusts measuring between 70 and 95 miles per hour on December 2nd and 3rd helped push the flames into new areas of dry vegetation. Brutal fire season continues in California

While the winds have since died down, there is an urgency to contain the fires before strong winds pick back up next week. 

Since the beginning of 2020, fires have burned more than 1.4 million acres in California. 

The image was captured on December 3, 2020, with the Operational Land Imager (OLI) on the Landsat 8 satellite. California is also <a title="List of country subdivisions by population" href="https://en.wikipedia.org/wiki/List_of_country_subdivisions_by_population">the most populated subnational entity</a> in North America, and has its state capital in <a title="Sacramento, California" href="https://en.wikipedia.org/wiki/Sacramento,_California">Sacramento</a>. The <a title="Greater Los Angeles" href="https://en.wikipedia.org/wiki/Greater_Los_Angeles">Greater Los Angeles</a> area and the <a title="San Francisco Bay Area" href="https://en.wikipedia.org/wiki/San_Francisco_Bay_Area">San Francisco Bay Area</a> are the nation's second- and fifth-most-populous <a title="Statistical area (United States)" href="https://en.wikipedia.org/wiki/Statistical_area_(United_States)">urban regions</a>, with more than 18.7 million and 9.6 million residents respectively.<a href="https://en.wikipedia.org/wiki/California#cite_note-13">[13]</a> <a title="Los Angeles" href="https://en.wikipedia.org/wiki/Los_Angeles">Los Angeles</a> is California's <a title="List of largest California cities by population" href="https://en.wikipedia.org/wiki/List_of_largest_California_cities_by_population">most populous city</a>, and the country's <a title="List of United States cities by population" href="https://en.wikipedia.org/wiki/List_of_United_States_cities_by_population">second-most-populous</a>, after <a title="New York City" href="https://en.wikipedia.org/wiki/New_York_City">New York City</a>. California also has the nation's <a title="List of the most populous counties in the United States" href="https://en.wikipedia.org/wiki/List_of_the_most_populous_counties_in_the_United_States">most populous county</a>, <a title="Los Angeles County, California" href="https://en.wikipedia.org/wiki/Los_Angeles_County,_California">Los Angeles County</a>, and its <a title="List of the largest counties in the United States by area" href="https://en.wikipedia.org/wiki/List_of_the_largest_counties_in_the_United_States_by_area">largest county</a> by area, <a title="San Bernardino County, California" href="https://en.wikipedia.org/wiki/San_Bernardino_County,_California">San Bernardino County</a>. The <a title="San Francisco" href="https://en.wikipedia.org/wiki/San_Francisco">City and County of San Francisco</a> is both the country's <a title="List of United States cities by population density" href="https://en.wikipedia.org/wiki/List_of_United_States_cities_by_population_density">second most densely populated major city</a> after New York City and the <a title="County statistics of the United States" href="https://en.wikipedia.org/wiki/County_statistics_of_the_United_States">fifth-most-densely populated county</a>, behind only four of the five New York City <a title="Boroughs of New York City" href="https://en.wikipedia.org/wiki/Boroughs_of_New_York_City">boroughs</a>.

Image Credit: NASA Earth Observatory 

---

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Brutal fire season continues in California

Bright,,Red-dark,Quasar,In,Deep,Space.,Elements,Of,This,Image

Astronomers have identified a remarkable water reservoir hidden in a corner of the cosmos, circling a quasar more than 12 billion light-years away.



At that distance, the light we see today began its journey not too long after the universe itself formed. 



The water supply in this distant place is huge, containing the equivalent of about 140 trillion times all the water in Earth’s oceans combined.



This supply is sitting near a supermassive black hole that is about 20 billion times more massive than our sun. 



<a href="https://www.earth.com/news/oldest-black-hole-ever-discovered-dates-back-to-the-dawn-of-time/" target="_blank" rel="noreferrer noopener">The black hole</a> is surrounded by a quasar named APM 08279+5255, which pumps out as much energy as a thousand trillion suns. 



This quasar, according to astronomers, holds the farthest and largest known reservoir of water anywhere in the universe.



<h2 class="wp-block-heading" id="h-quasar-apm-08279-5255-and-its-water">Quasar APM 08279+5255 and its water</h2>



Matt Bradford, a scientist at NASA’s <a href="https://www.jpl.nasa.gov/" target="_blank" rel="noreferrer noopener">Jet Propulsion Laboratory</a> in Pasadena, Calif., leads one of the teams involved in the observations.



“The environment around this quasar is very unique in that it’s producing this huge mass of water,” said Matt Bradford. “It’s another demonstration that water is pervasive throughout the universe, even at the very earliest times.”



Both Bradford’s group and a separate team of astronomers studied APM 08279+5255 and its <a href="https://www.earth.com/news/massive-black-hole-is-seen-taking-a-nap-after-eating-too-much/" target="_blank" rel="noreferrer noopener">black hole</a>, which sits at the center and draws matter inward. 



As it does, it warms the surrounding gas and dust, forming an area filled with molecules that have never before been detected at such an immense distance.



<h2 class="wp-block-heading" id="h-understanding-quasars-the-basics">Understanding quasars -- the basics</h2>



Quasars were first noticed more than half a century ago when telescopes revealed puzzling sources of intense brightness in <a href="https://www.earth.com/news/hubble-took-the-closest-ever-image-of-a-quasar-and-captured-some-weird-things/" target="_blank" rel="noreferrer noopener">distant areas of space</a>. 



These objects are unlike any ordinary star. They shine brightly from the center of distant galaxies, outshining all their galaxy’s stars combined.



At their heart sit supermassive black holes, millions or billions of times heavier than our sun. As gas and dust spiral in toward one of these black holes, the swirling material heats up and <a href="https://www.earth.com/news/black-hole-jet-crashes-into-an-unidentified-object/" target="_blank" rel="noreferrer noopener">releases energy</a>. 



This energy blasts out across all kinds of wavelengths, making quasars some of the brightest, most energetic phenomena ever seen.



Observing quasars helps astronomers understand what the universe looked like long ago, since the light we see now began its journey billions of years in the past. 



Quasars can show how galaxies formed, how matter spread out, and how the earliest structures in the cosmos came together.



They can even help map the distribution of matter between galaxies, shining light on the regions that would otherwise remain unseen. 



Some quasars also launch <a href="https://www.earth.com/news/black-hole-jets-are-like-million-light-year-long-jedi-lightsabers/" target="_blank" rel="noreferrer noopener">huge jets of high-speed particles</a> that stretch across enormous distances. These jets can affect how stars form, influencing entire neighborhoods of cosmic material.



<h2 class="wp-block-heading" id="h-strange-place-to-find-water">Strange place to find water</h2>



Astronomers observed that water vapor is present in this quasar’s environment. It occupies a region spanning hundreds of light-years, with one light-year at around six trillion miles. 



Although the gas is thin by Earth standards, it is surprisingly warm and dense compared to what is typical in places like our <a href="https://www.earth.com/news/milky-ways-black-hole-formed-through-a-merger/" target="_blank" rel="noreferrer noopener">Milky Way</a>.



The temperature hovers around minus 63 degrees Fahrenheit, and the gas is roughly 300 trillion times less dense than Earth’s atmosphere. 



Still, it is about five times hotter and tens to hundreds of times denser than the gas seen in normal galaxies. With its unusual conditions, this region stands out as an unexpected find.



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



<a href="https://www.earth.com/news/oceans-of-water-vapor-may-be-involved-in-planet-formation/" target="_blank" rel="noreferrer noopener">Water vapor</a> is not just a molecule. Its presence here suggests that the quasar is bathing its environment in radiation that keeps the gas relatively warm. 



Astronomers also spotted other molecules, like carbon monoxide, hinting that there is an abundance of raw material that can feed the black hole as it continues to grow.



They estimate that there is enough gas for the <a href="https://www.earth.com/news/largest-map-of-supermassive-black-holes-unveiled/" target="_blank" rel="noreferrer noopener">black hole</a> to increase in size by about six times, although what actually happens next is not certain. 



Some of this gas may form new stars, while some might be thrown out into space instead. Either way, these measurements open a window into what conditions were like when the universe was still young.



<h2 class="wp-block-heading" id="h-quasars-water-and-life-s-building-blocks">Quasars, water, and life's building blocks</h2>



Detecting water vapor in such a distant quasar expands our knowledge of how <a href="https://www.earth.com/news/did-the-building-blocks-of-life-replicate-on-their-own/" target="_blank" rel="noreferrer noopener">building blocks</a> appear across vast stretches of time and space. 



Water is essential for life as we know it, and its presence billions of years ago suggests that the elements needed for life have been around for a very long time.



Beyond that, water plays a key role in shaping how stars and galaxies evolve. When gas clouds cool, water helps by allowing those clouds to collapse more easily, leading to star birth. 



By spotting it this far back, astronomers get new clues about how galaxies changed as the universe aged and matured.



<h2 class="wp-block-heading" id="h-how-they-found-the-water-quasar">How they found the water quasar</h2>



Bradford’s team began collecting data in 2008 with an instrument called Z-Spec at the California Institute of Technology’s Submillimeter Observatory (<a href="https://www.cso.caltech.edu/" target="_blank" rel="noreferrer noopener">CSO</a>). 



This 33-foot telescope sits near the summit of Mauna Kea in Hawaii. They later confirmed their findings using the Combined Array for Research in Millimeter-Wave Astronomy (<a href="https://www.mmarray.org/" target="_blank" rel="noreferrer noopener">CARMA</a>), a set of radio dishes located high in the Inyo Mountains of Southern California.



Meanwhile, another group led by Dariusz Lis, senior research associate in physics at Caltech and deputy director of the Caltech Submillimeter Observatory, used the Plateau de Bure Interferometer in the French Alps. 



In 2010, Lis’s team found hints of water in this quasar by detecting a single signature, while Bradford’s team uncovered multiple signals that revealed the massive amount of water present.



<h2 class="wp-block-heading" id="h-where-do-we-go-from-here">Where do we go from here?</h2>



To sum it all up, this discovery shows that even at a time when the universe was young, water formed and gathered in places we never would have guessed. 



Instead of seeing just cold, empty darkness out there, astronomers have spotted a real treasure -- an enormous reservoir of water swirling around a quasar more than 12 billion light-years away. 



This water vapor, along with the intense radiation from the black hole at the quasar’s center, paints a picture of an environment that is far denser, warmer, and more active than ordinary parts of the cosmos.



By studying this distant quasar, scientists can learn how the earliest galaxies came together and evolved. They can see how matter spread out, how black holes grew, and how even tiny molecules like water played a role in shaping the universe. 



Every new detail uncovered by these long-ago signals traveling through time and space helps make sense of the vast cosmic story we are all a part of.



***



Other authors on the Bradford paper, "The water vapor spectrum of APM 08279+5255," include Hien Nguyen, Jamie Bock, Jonas Zmuidzinas and Bret Naylor of JPL; Alberto Bolatto of the University of Maryland, College Park; Phillip Maloney, Jason Glenn and Julia Kamenetzky of the University of Colorado, Boulder; James Aguirre, Roxana Lupu and Kimberly Scott of the University of Pennsylvania, Philadelphia; Hideo Matsuhara of the Institute of Space and Astronautical Science in Japan; and Eric Murphy of the Carnegie Institute of Science, Pasadena. Funding for Z-Spec was provided by the <a href="https://www.nsf.gov" target="_blank" rel="noreferrer noopener">National Science Foundation</a>, <a href="https://www.nasa.gov" target="_blank" rel="noreferrer noopener">NASA</a>, the Research Corporation and the partner institutions.



The full study was published in the <a href="https://iopscience.iop.org/article/10.1088/2041-8205/738/1/L6/meta" target="_blank" rel="noreferrer noopener">Astrophysical Journal Letters</a>.



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



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



-----

Enough water to fill trillions of Earth's oceans found in deep space circling a black hole

Astronomers have identified a remarkable water reservoir hidden in a...

Cosmic rays are high-speed particles that move through space and crash into our atmosphere from every direction. These energetic particles, mostly atomic nuclei stripped of their electrons, have puzzled scientists for decades.



They hit Earth from different places with a wide range of energies. Some arrive at moderate levels, while others carry so much punch that researchers use special detectors stretching over vast areas to understand their true nature.



<h2 class="wp-block-heading" id="h-cosmic-rays-above-5-eev">Cosmic rays above 5 EeV</h2>



Particles carrying more than about five <a href="https://pwg.gsfc.nasa.gov/Education/wenpart1.html" target="_blank" rel="noreferrer noopener">exa-electronvolts</a> (EeV) of energy stand out because they mark a turning point. 



At lower energies, cosmic rays often show a smoother distribution, and are strongly influenced by magnetic fields in our own galaxy.



Once they cross the 5 EeV threshold, however, their behavior and properties change. They begin to show patterns that cannot be explained by local sources alone. 



Instead of originating mostly from within the Milky Way, they appear to come from distant corners of the cosmos that lie far beyond our familiar galactic neighborhood.



Studies indicate that at these energies, called <a href="https://arxiv.org/pdf/2412.05974" target="_blank" rel="noreferrer noopener">the ankle region</a>, the usual mixture of mostly light nuclei, like protons, gradually gives way to heavier particles that are less scrambled by <a href="https://ui.adsabs.harvard.edu/abs/2013pss5.book..641B/abstract" target="_blank" rel="noreferrer noopener">galactic magnetic fields</a>.



According to <a href="https://www.researchgate.net/profile/Jonathan-Biteau" target="_blank" rel="noreferrer noopener">Jonathan Biteau</a>, from the Academic Institute of France's <a href="https://www.auger.org/collaboration/" target="_blank" rel="noreferrer noopener">Pierre Auger Collaboration</a>, this energy range represents a step into a more revealing territory.



<h2 class="wp-block-heading" id="h-observing-signs-in-the-data">Observing signs in the data</h2>



Changes in the large-scale patterns of cosmic rays <a href="https://www.earth.com/news/cosmic-rays-help-archaeologists-determine-age-discoveries-prehistoric-settlements/" target="_blank" rel="noreferrer noopener">seen across the sky</a> start to stand out and offer clues to their sources. 



This is where the cosmic ray story moves beyond a random spray of particles and hints at something else: extragalactic origins with distinct characteristics.



"Cosmic rays begin to reveal their secrets at energies above 5 EeV," said Biteau.



Measurements gathered over many years at facilities like the Pierre Auger Observatory show that once energies climb past this point, a pattern emerges in the shape of the energy spectrum.



Distinct features, known as the ankle near 5 EeV, the instep at about 15 EeV, and the toe around 45 EeV, mark noticeable shifts in the composition of the flux.



<h2 class="wp-block-heading" id="h-clues-to-sources-of-cosmic-rays">Clues to sources of cosmic rays</h2>



Observations <a href="https://arxiv.org/abs/2008.06486" target="_blank" rel="noreferrer noopener">indicate</a> that heavier nuclei start dominating the picture at higher energies. These changes tell researchers that different acceleration processes and astrophysical environments might be at play.



As energies increase, the sky coverage reveals that some directions supply more cosmic rays than others. This nonuniformity, known as anisotropy, has become more apparent.



Over the past decade, scientists have reported that the pattern of cosmic-ray arrival directions changes in a way that strongly suggests extragalactic sources. 



<a href="https://www.science.org/doi/10.1126/science.aan4338" target="_blank" rel="noreferrer noopener">Research</a> shows a large-scale anisotropy above a few EeV rising to a significance of about 7 σ above 8 EeV.



<h2 class="wp-block-heading" id="h-one-step-closer">One step closer</h2>



Pinpointing the birthplaces of these high-energy particles has proved challenging, but scientists continue to gather clues. 



As cosmic rays push into these higher energy realms, they are less scattered by magnetic fields, making it easier to identify their original directions.



Emerging <a href="https://arxiv.org/abs/1612.07155" target="_blank" rel="noreferrer noopener">evidence</a> supports the idea that many of these ultra-high-energy rays are launched by extragalactic sources like star-forming galaxies or other intense astrophysical sites.



The data hint that active regions far beyond our galaxy could be connected to the observed arrival patterns.



Researchers also notice that certain sky regions, like those associated with clusters of nearby galaxies, line up better with the arrival directions than a purely uniform spread would allow.



<h2 class="wp-block-heading" id="h-shifts-in-cosmic-rays-composition">Shifts in cosmic rays' composition</h2>



Stepping above 5 EeV not only shines a light on extragalactic origins but also shows that the “stuff” hitting us at these energies is different.



Instead of mostly light nuclei like hydrogen and helium, many cosmic rays are heavier, involving atoms like carbon or oxygen.



This suggests that whatever "engines" are producing them, they must either selectively accelerate heavier particles or conditions in their environment alter the mix by the time they reach Earth.



The surprising scarcity of lighter elements runs counter to earlier guesses and requires fresh thinking from theorists.



<h2 class="wp-block-heading" id="h-what-holds-the-key-to-their-birthplaces">What holds the key to their birthplaces?</h2>



As these rays travel huge distances, their paths bend slightly in <a href="https://www.earth.com/news/powerful-magnetic-fields-may-be-key-features-of-black-holes/">magnetic fields</a> along the way. Even tiny bends can shuffle their directions enough to complicate efforts to pinpoint sources.



To address this, scientists model how nuclei of different masses respond to magnetic fields. If the rays still show a pattern that points to certain neighborhoods in space, that strengthens the argument that those regions contain the engines fueling these incredible energies.



<h2 class="wp-block-heading" id="h-no-single-culprit-yet">No single culprit yet</h2>



Many questions remain. Some experts suggest star-forming galaxies as prime suspects since these environments can host energetic events that might whip particles up to extreme energies.



Others consider whether active galactic nuclei, powered by <a href="https://astronomy.swin.edu.au/cosmos/S/Supermassive+Black+Hole" target="_blank" rel="noreferrer noopener">supermassive black holes</a>, might do the trick.



Current evidence favors the idea that star-forming galaxies provide a better match to the observed patterns than other candidates, but that does not slam the door on other possibilities.



<h2 class="wp-block-heading" id="h-bridging-theory-and-observations">Bridging theory and observations</h2>



The unusual composition and the changing patterns seen above 5 EeV push theorists to re-examine old ideas. 



Traditional models that relied on smooth distributions of particle energies and the presence of light nuclei are under pressure.



New models must explain the sharp transitions, the heavy nuclei, and the hints of extragalactic origins. As measurements improve, scientists hope to confirm or refute certain types of sources. 



If future data link cosmic rays more closely to certain types of galaxies or astrophysical conditions, it would be a major step forward in understanding how the universe’s most energetic particles are made.



<h2 class="wp-block-heading" id="h-ongoing-upgrades-and-the-future">Ongoing upgrades and the future</h2>



As detectors improve and more data are collected, the community expects to refine the energy calibration, measure more showers, and achieve better accuracy. Each improvement adds detail to this cosmic jigsaw puzzle.



If a tighter correlation with certain galaxy groups emerges, that could finally close in on the actual sources. Until then, each new measurement, each new analysis, and each new insight keeps the hunt alive.



The research paper was published in the <a href="https://journals.aps.org/prd/abstract/10.1103/PhysRevD.102.062005" target="_blank" rel="noreferrer noopener">Physical Review Journals</a>.



-----



Like what you read?<a href="https://www.earth.com/subscribe/"> Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



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



-----

Strange, high-energy cosmic rays: Did something outside our galaxy send them here?

Cosmic rays are high-speed particles that move through space and...

Humanity faces an urgent need for change to prevent biodiversity loss and the continued destruction of our planet. The UN biodiversity expert panel's latest "transformative change" report highlights the dire need for radical societal shifts.



Released Wednesday by the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES), the report calls for immediate action to address overconsumption, wealth concentration, and humanity's growing disconnection from nature.



"It is not just governments. It is not just business. It is not just civil society. It is all of us. We all need to work together," said Arun Agrawal, one of the report’s lead authors.



While transformative action may seem challenging, the report emphasizes that it is achievable. Here’s a closer look at three inspiring examples of successful transformations from around the world.



<h2 class="wp-block-heading" id="h-reviving-marine-ecosystems-os-minarzos-model">Reviving marine ecosystems: "Os Minarzos" model</h2>



In 2002, Spain suffered a severe ecological disaster when the Prestige oil tanker broke apart, spilling massive amounts of oil into the Atlantic Ocean. 



This environmental catastrophe devastated Galicia's coastline, causing significant <a href="https://www.earth.com/news/polar-light-sustains-biodiversity-over-millions-of-years/" target="_blank" rel="noreferrer noopener">biodiversity</a> loss and severely affecting marine life and the livelihoods of local fishing communities.



In response, the communities in Galicia decided to adopt a new approach to marine reserve management, called the "Os Minarzos" model.



<h2 class="wp-block-heading" id="h-advantages-of-the-model">Advantages of the model</h2>



This innovative strategy brought together fishers, scientists, and local authorities to collaboratively restore and protect the marine ecosystem. 



The model emphasized sustainable fishing practices, scientific guidance, and community involvement - promoting cooperation among all stakeholders.



Although the transition faced challenges, including initial disagreements and tensions, the initiative became a long-term success. 



Over time, the "Os Minarzos" model led to healthier marine ecosystems, improved fishing practices, and increased <a href="https://www.earth.com/news/new-solutions-for-the-climate-and-biodiversity-crisis/" target="_blank" rel="noreferrer noopener">biodiversity</a>. Local fishers also experienced higher incomes, while trust and cooperation within the community strengthened significantly.



The model’s impact extended far beyond Galicia. It inspired international guidelines for sustainable marine management and influenced networks of over 20 million fishers across Europe and the Americas. 



<h2 class="wp-block-heading" id="h-technology-to-prevent-biodiversity-loss">Technology to prevent biodiversity loss</h2>



In China, the Ant Forest mobile application has become a <a href="https://www.earth.com/news/urban-biodiversity-is-not-a-luxury-it-is-attainable-for-everyone/" target="_blank" rel="noreferrer noopener">powerful tool</a> for promoting eco-friendly habits and environmental restoration. 



Launched in 2016, this innovative app encourages users to adopt sustainable behaviors, such as walking or cycling instead of driving, and cutting down on plastic and paper usage. 



For every eco-friendly action, users earn "green energy points" in the app, which accumulate to grow a virtual tree. Each virtual tree is then matched with the planting of a real tree.



The initiative has made a significant impact. Since its inception, Ant Forest has planted an astounding 548 million trees across 13 provinces in China. This reforestation effort not only helps combat climate change but also addresses environmental degradation in vulnerable areas.



Beyond its environmental benefits, the project has also provided economic opportunities. It has created jobs in eco-agriculture and ecotourism, particularly in rural regions struggling with environmental challenges. 



<h2 class="wp-block-heading" id="h-community-led-conservation">Community-led conservation</h2>



The <a href="https://www.nashulai.com" target="_blank" rel="noreferrer noopener">Nashulai Maasai Conservancy</a> in Kenya is a pioneering example of how traditional knowledge and community engagement can drive effective <a href="https://www.earth.com/news/what-are-the-biggest-drivers-of-biodiversity-loss/" target="_blank" rel="noreferrer noopener">conservation</a>. 



This initiative blends the wisdom of indigenous practices with modern approaches to tackle multiple challenges, including species protection, income generation, and climate change mitigation.



The conservancy adopts a holistic strategy by establishing community-managed protected areas. These areas not only safeguard wildlife and combat biodiversity loss but also involve local communities in activities like river cleaning and tree planting. 



Such efforts improve environmental health while addressing the needs of the people living in the region.



This collaborative approach has transformed Nashulai into a thriving habitat where both humans and wildlife coexist harmoniously. By empowering local communities and integrating ecological restoration with socio-economic benefits, Nashulai exemplifies how conservation can work in harmony with human development.



"Over a very short period of time, biodiversity reappeared," said Karen O’Brien, another lead author of the report. "The power of community, again and again in our examples, is important."



<h2 class="wp-block-heading" id="h-addressing-biodiversity-loss">Addressing biodiversity loss</h2>



The <a href="https://www.un.org/en/" target="_blank" rel="noreferrer noopener">UN</a> report highlights the interconnectedness of ecological, social, and economic challenges - offering a blueprint for action.



Addressing biodiversity loss and ecosystem collapse requires collective effort. "It is all of us. We all need to work together," said Agrawal.



These stories from Galicia, China, and Kenya show that transformation is not only possible but can yield tangible benefits. 



Whether through community-driven conservation, innovative technology, or collaborative governance, humanity has the tools to make a <a href="https://www.earth.com/news/animal-tracking-is-crucial-for-preserving-biodiversity/" target="_blank" rel="noreferrer noopener">difference</a>. The question is whether or not we will rise to the challenge.



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



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



-----

UN report calls for global change to stop biodiversity loss

Humanity faces an urgent need for change to prevent biodiversity...

Mars,Inner,Structure.,Elements,Of,This,Image,Furnished,By,Nasa

A fresh look inside Mars suggests that what lurks far beneath its dusty surface might change how we think about water on the Red Planet.



Evidence emerging from <a href="https://www.pnas.org/doi/10.1073/pnas.2409983121" target="_blank" rel="noreferrer noopener">research</a> published in the Proceedings of the National Academy of Sciences indicates that liquid water is sequestered deep under the Red Planet's surface, locked in cracks and pores.



Scientists say there could be enough of it to blanket the entire planet under about a mile of ocean. This revelation challenges the old assumption that most of Mars water vanished into space billions of years ago.



Instead, a substantial portion of it may never have left at all -- remaining present deep underground.



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



Deep beneath the barren landscape, seismic readings gathered by NASA’s <a href="https://science.nasa.gov/mission/insight" target="_blank" rel="noreferrer noopener">InSight mission</a> support the idea of an immense, hidden reservoir. 



Researchers from the <a href="https://www.berkeley.edu/" target="_blank" rel="noreferrer noopener">University of California, Berkeley</a>, and <a href="https://ucsd.edu/" target="_blank" rel="noreferrer noopener">UC San Diego</a> honed in on signals from Mars's quakes, meteor strikes, and volcanic murmurs to map what lies below.



By interpreting how these waves traveled through different layers, the team found that the presence of water-soaked rock best explains the data.



The <a href="https://www.forbes.com/sites/roberthart/2024/08/12/scientists-discover-oceans-worth-of-liquid-water-on-mars-and-a-potential-home-for-alien-life-but-theres-one-big-catch/">findings</a> suggest that liquid is trapped in tiny fissures deep underground. According to Manga, a hidden water supply far below the Martian surface is hardly an inhospitable zone.



“I don't see why [the underground water] is not a habitable environment,” said <a href="https://eps.berkeley.edu/people/michael-manga" target="_blank" rel="noreferrer noopener">Michael Manga</a>, a professor of earth and planetary science at UC Berkeley.



<h2 class="wp-block-heading" id="h-mars-water-and-potential-for-life">Mars water and potential for life</h2>



No direct biosignatures have ever emerged from Mars, yet the notion of a suitable habitat underground tempts the imagination. 



Organisms on Earth survive at crushing depths and in pitch-black caverns. Similar conditions might exist beneath Mars’s crust.



“We haven't found any evidence for <a href="https://www.earth.com/news/insights-alien-life-mars-water-sulfur-discovered-gained-studying-extreme-life-earth/">life on Mars</a>, but at least we have identified a place that should, in principle, be able to sustain life,” Manga explained.



Even so, confirming anything alive down there is a tall order, and any future attempt to reach these elusive waters would stretch engineering know-how to its limit.



<h2 class="wp-block-heading" id="h-deep-drilling-and-tough-odds">Deep drilling and tough odds</h2>



Though the newfound reservoir might hold riches of scientific interest, it also resides at depths of about 7 to 13 miles (11 to 21 kilometers). 



On Earth, drilling down that far is beyond current engineering capabilities. The <a href="https://www.theguardian.com/world/2023/jun/06/china-begins-drilling-one-of-worlds-deepest-holes-in-hunt-for-discoveries-deep-inside-the-earth" target="_blank" rel="noreferrer noopener">Kola Superdeep Borehole</a> in Russia, the deepest hole ever created by humans, reached just over 7.6 miles (12 kilometers).



Tapping the <a href="https://www.earth.com/news/mars-has-a-water-reservoir-two-miles-deep-enough-to-fill-earths-red-sea/" target="_blank" rel="noreferrer noopener">Martian water supply</a>, which sits deeper, looks virtually impossible with the technology we have today. 



This puts a damper on visions of settlers using these waters as a resource anytime soon. Mars may be water-rich underground, but those riches are locked away.



<h2 class="wp-block-heading" id="h-clues-from-the-past">Clues from the past</h2>



Long ago, Mars likely resembled a wetter place. Orbital imaging and rover missions have <a href="https://www.nasa.gov/news-release/nasa-confirms-evidence-that-liquid-water-flows-on-todays-mars/" target="_blank" rel="noreferrer noopener">revealed</a> surface features that point to a time when rivers and lakes carved out the terrain. 



Geological evidence indicates that liquid water helped <a href="https://www.earth.com/news/freya-castle-rock-with-black-and-white-stripes-found-on-mars-has-nasa-excited/">form certain minerals</a>.



Scientists have struggled to explain what happened when Mars lost its thick atmosphere, which once prevented surface water from vaporizing into space. 



These new findings hint that large portions of the planet’s original water supply did not vanish entirely. Instead, it may have seeped deep into the planet's crust, remaining there ever since.



<h2 class="wp-block-heading" id="h-window-into-martian-history">Window into Martian history</h2>



Wright, who contributed to understanding Mars’s current water distribution, stressed the significance of knowing how much and where liquid exists today.&nbsp;



“Understanding the Martian water cycle is critical for understanding the evolution of the climate, surface and interior. 



A useful starting point is to identify where water is and how much is there,” said <a href="https://vwright.scrippsprofiles.ucsd.edu/" target="_blank" rel="noreferrer noopener">Vashan Wright</a>, assistant professor at UC San Diego’s <a href="https://scripps.ucsd.edu/" target="_blank" rel="noreferrer noopener">Scripps Institution of Oceanography</a>.



Peering into this underground reservoir offers a rare glimpse into ancient processes that shaped the Red Planet. It may explain why Mars shifted from a wet environment to a cold, dry world.



<h2 class="wp-block-heading" id="h-water-on-mars-and-future-study">Water on Mars and future study</h2>



The InSight mission, which ended in 2022, recorded seismic activity long enough to provide a wealth of clues about <a href="https://www.earth.com/news/mars-gravity-map-exposes-ancient-structures-and-volcanic-activity/">Mars’s structure</a>. Its readings have now sparked a different perspective on where the Red Planet stashed its water.



Reaching and analyzing these underground stores remain a distant dream, but simply knowing they exist changes how scientists think about Mars as a potentially habitable place. 



Perhaps the mysteries of these deep waters will inspire novel tools and missions in future.



Until then, human curiosity and imagination will keep this buried reservoir near the top of must-explore questions as we continue to study the planet’s past and puzzle over its <a href="https://www.earth.com/news/nasa-may-have-finally-discovered-life-on-mars/">potential for supporting life</a>.



-----



Like what you read?<a href="https://www.earth.com/subscribe/"> Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



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



-----

Buried water found on Mars sparks new hopes and headaches

A fresh look inside Mars suggests that what lurks far...

Have you ever wondered how malignancies like cancer grow, evolve, and, most importantly, how we can stop them? The answer may be hidden within the microscopic world of our cells.



This year, the World Health Organization has reported that cancer afflicted over 20 million people and claimed nearly 10 million lives. The search for an effective cure is a race against time, and two bright minds from Texas A&amp;M University have brought us a step closer to the finish line.



<h2 class="wp-block-heading" id="h-environment-around-cancer-cells">Environment around cancer cells</h2>



Graduate students Samere Zade and Ting-Ching Wang from <a href="https://www.tamu.edu" target="_blank" rel="noreferrer noopener">Texas A&amp;M University</a>, working under the guidance of the Lele Lab, have uncovered valuable insights into <a href="https://www.earth.com/news/ai-is-the-next-frontier-in-cancer-treatment/" target="_blank" rel="noreferrer noopener">cancer’s progression</a>.



The research, published in the journal Nature Communications, reveals how the stiffening of a tumor cell’s environment influences the structure and function of its nucleus. This offers a new perspective on why cancer cells proliferate so aggressively.



“Cancer has proven to be a difficult disease to treat. It is extremely complex, and the molecular mechanisms that enable tumor progression are not understood,” explained Dr. Tanmay Lele, a joint faculty member in biomedical and chemical engineering. 



“Our findings shed new light into how the stiffening of tumor tissue can promote tumor cell proliferation.”



<h2 class="wp-block-heading" id="h-stiffness-and-cancer-cell-proliferation">Stiffness and cancer cell proliferation</h2>



The study highlights how tumor <a href="https://www.earth.com/news/the-cooking-oils-in-your-diet-may-be-linked-to-cancer/" target="_blank" rel="noreferrer noopener">cells</a> respond to stiff surroundings. The nuclear lamina, which is like a support structure for the cell's nucleus, becomes smoother and tighter when the cell interacts with a stiff environment. 



This happens because the cell spreads out on the rigid surface, causing changes in the nucleus's structure.



As a result, a specific protein called yes-associated protein (YAP) moves into the nucleus. YAP plays a crucial role in controlling how cells multiply. Once inside the nucleus, YAP activates processes that make the <a href="https://www.earth.com/news/molecular-fingerprints-could-be-key-to-early-cancer-detection/" target="_blank" rel="noreferrer noopener">cancer</a> cells grow and divide more rapidly, contributing to the aggressive spread of the tumor.



“The ability of stiff matrices to influence nuclear tension and regulate YAP localization could help explain how tumors become more aggressive and perhaps even resistant to treatment in stiffened tissues,” said Zade.



<h2 class="wp-block-heading" id="h-structural-integrity-of-the-cell-nucleus">Structural integrity of the cell nucleus</h2>



This discovery expands on earlier research by the Lele Lab, which showed that the cell nucleus acts similarly to a liquid droplet. Just like a droplet maintains its shape due to surface tension, the nucleus relies on a protein called lamin A/C in its nuclear lamina to preserve its structural integrity.



In the new study, researchers found that lamin A/C not only helps maintain the nucleus shape but also plays a key role in regulating cancer cell <a href="https://www.earth.com/news/simple-lifestyle-changes-could-prevent-half-of-all-cancer-deaths/" target="_blank" rel="noreferrer noopener">growth</a>.



When lamin A/C levels are reduced, it disrupts the ability of the yes-associated protein (YAP) to move into the nucleus. 



Since YAP is responsible for promoting cell multiplication, this reduction in lamin A/C limits YAP activity in the nucleus, slowing down the rapid proliferation of cancer cells. This finding suggests that lamin A/C could be a potential target for cancer treatments.



“The protein lamin A/C plays a key role here - reducing it made cells less responsive to environmental stiffness, particularly affecting the localization of a key regulatory protein (YAP) to the nucleus,” Zade explained.



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



The implications of this research extend beyond academic understanding. By uncovering how matrix stiffness drives nuclear changes and regulates pathways like YAP signaling, the findings open the door to innovative cancer treatments.



“Uncovering how matrix stiffness drives nuclear changes and regulates key pathways, like YAP signaling, opens the door to developing therapies that target these mechanical pathways,” said Zade. 



“Drugs or treatments could be designed to soften the tumor environment, disrupting the physical cues that help cancer cells thrive. Lamin A/C and related nuclear mechanics could become targets for cancer treatments.”



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



The <a href="https://lelelab.org" target="_blank" rel="noreferrer noopener">Lele Lab</a> plans to expand its research by investigating the extent to which these findings apply to tumors derived from patients. This step could bridge the gap between lab-based discoveries and practical treatments, bringing hope to millions affected by <a href="https://www.earth.com/news/ketogenic-diet-may-help-the-body-kill-cancer-cells/" target="_blank" rel="noreferrer noopener">cancer</a>.



This work was supported by the National Institutes of Health, the Cancer Prevention and Research Institute of Texas, and the National Science Foundation. The Texas A&amp;M Engineering Experiment Station administered the funding, highlighting the institution’s commitment to innovative cancer research.



Through their meticulous study of nuclear mechanics and tumor stiffness, the researchers at the Lele Lab have paved the way for new avenues in cancer treatment. 



The findings highlight the importance of targeting the physical microenvironment of cancer cells, offering a fresh perspective in the fight against one of humanity’s most challenging diseases.



The study is published in the journal <a href="https://www.nature.com/articles/s41467-024-54577-4" target="_blank" rel="noreferrer noopener">Nature Communications</a>.



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



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



-----

Microscopic discovery reveals how cancer cells grow faster

Have you ever wondered how malignancies like cancer grow, evolve,...

Ever thought that saving trees was as simple as stopping deforestation? Think again. A new study from Ecuador's Amazon reveals a more complicated story, where the survival of trees depends on a delicate dance between plants and animals - and this dance is falling apart.



Research from the Universidad de las Américas (UDLA) in Ecuador, led by Dr. Juan Ernesto Guevara-Andino and Dr. María-José Endara, has revealed some startling numbers.



About 14% of tree species in the Ecuadorian Amazon are critically endangered, while almost half (47%) could go extinct if things don't change.



<h2 class="wp-block-heading" id="h-trees-with-smaller-fruits">Trees with smaller fruits</h2>



Size matters in the Amazon, but not in the way you'd expect. Trees with smaller fruits are having an especially tough time. These <a href="https://www.earth.com/news/more-than-one-third-of-the-worlds-trees-face-extinction/" target="_blank" rel="noreferrer noopener">trees</a> rely on specific animals to spread their seeds, and those animals are becoming harder to find.



It's like a restaurant losing its delivery drivers - the food's ready to go, but there's no way to get it where it needs to be.



<h2 class="wp-block-heading" id="h-threats-to-amazonian-trees">Threats to Amazonian trees</h2>



While most of us think of logging when we hear about threats to the Amazon, the reality is far more complex.



<a href="https://www.earth.com/news/the-worlds-largest-living-organism-consists-of-47000-trees/" target="_blank" rel="noreferrer noopener">Trees</a> don't live in isolation - they are part of a community that includes insects, birds, and mammals. Each species plays its role, whether it's pollinating flowers or spreading seeds.



"Thus, our results highlight the importance of incorporating meaningful ecological traits in extinction risk estimates, such as those related to reproduction and life history strategies," explained Dr. Endara.



Her words point to a crucial fact: we can't save trees without understanding their relationships with other species.



<h2 class="wp-block-heading" id="h-protected-areas-not-as-safe-as-we-thought">Protected areas: Not as safe as we thought</h2>



One may think trees in protected areas would be safe. However, the study found otherwise. Even in Yasuní National Park, Ecuador's crown jewel of conservation, <a href="https://www.earth.com/news/resilient-trees-can-help-safeguard-cities-from-climate-change/" target="_blank" rel="noreferrer noopener">trees are in trouble</a>.



"For example, we found that some endemic tree species populations are experiencing high levels of threat by deforestation inside the Yasuní National Park, the biggest and most iconic protected area in the Ecuadorian Amazon," noted Dr. Guevara-Andino.



<h2 class="wp-block-heading" id="h-new-approach-to-protecting-amazon-trees">New approach to protecting Amazon trees</h2>



The old way of protecting trees mainly focused on stopping deforestation. But this study shows we need to think bigger. 



We need to protect not just the trees, but the entire system that they are part of - including the animals that help them reproduce and spread.



This means conservation plans need to consider things like which animals disperse each tree's seeds, how different species depend on each other, and what happens when one species disappears from the system.



<h2 class="wp-block-heading" id="h-looking-beyond-ecuador">Looking beyond Ecuador</h2>



What's happening in Ecuador isn't just Ecuador's problem. The <a href="https://www.udla.cl" target="_blank" rel="noreferrer noopener">UDLA</a> study gives us clues about what might be happening in other rainforests around the world. 



When we lose one species, it affects many others - like pulling one thread and watching a whole sweater unravel.



The good news is that understanding these connections gives us new ways to help. By protecting both trees and the animals they depend on, we have a better chance of <a href="https://www.earth.com/news/trees-are-relocating-in-a-race-against-global-warming/" target="_blank" rel="noreferrer noopener">keeping these forests alive</a> for future generations.



<h2 class="wp-block-heading" id="h-saving-the-amazon-s-trees">Saving the Amazon's trees</h2>



The numbers from this study - 14% critically endangered tree species and and 47% threatened - should wake us up.



But they also point the way forward. We can't just focus on stopping chainsaws. We need to protect the whole forest community - from the smallest pollinator to the largest seed-dispersing animal.



The path ahead isn't simple, but it's clear. To save the Amazon's trees, we need to think about forests differently. They're not just collections of trees - they're complex communities where every species plays a vital role. And just like any community, they are stronger when all of their members are healthy and present.



The research does more than just raise alarms. It shows us that saving trees means saving relationships - between <a href="https://www.earth.com/news/trees-have-an-amazing-ability-to-adapt-to-new-climates/" target="_blank" rel="noreferrer noopener">plants</a> and animals, between species and their environment, and ultimately, between humans and nature. The question now is whether we'll act on this knowledge in time to make a difference.



The trees of Ecuador's Amazon face many threats, but perhaps the biggest one is our own limited understanding of how forests really work. This study helps fix that problem. Now it's up to us to use this knowledge to protect not just the <a href="https://www.earth.com/news/city-greening-predicting-the-cooling-effects-of-trees/" target="_blank" rel="noreferrer noopener">trees</a>, but the entire web of life they're part of.



The study is published in the journal <a href="https://nph.onlinelibrary.wiley.com/doi/10.1002/ppp3.10606" target="_blank" rel="noreferrer noopener">Plants People Planet</a>.



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.&nbsp;



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



-----

Amazon trees are critically endangered, even in protected areas

Ever thought that saving trees was as simple as stopping...

For many decades, scientists have documented how burning fossil fuels releases greenhouse gases that trap heat near Earth’s surface, driving a gradual - but consistent - warming trend.&nbsp;



Recently, however, the world has experienced an extraordinary surge in temperatures, catapulting the climate system into uncharted territory and confounding some of the best climate models available.&nbsp;



This abrupt, persistent streak of unprecedented warmth over the past two years has shattered temperature records, raising urgent questions: Why is it so much hotter than expected right now, and does it signal a more profound transformation underway?



<h2 class="wp-block-heading" id="h-a-remarkable-and-persistent-heat-surge">A remarkable and persistent heat surge</h2>



After decades of steadily rising temperatures, 2023 saw a dramatic jump in <a href="https://www.earth.com/news/mapping-2024s-record-heat-unveiling-earths-climate-danger-zones/" target="_blank" rel="noreferrer noopener">global heat</a> - enough for it to become the hottest year in recorded history. But the extraordinary nature of this uptick did not stop there.&nbsp;



By 2024, average sea-surface and air temperatures had shot up again, setting new records that far exceeded previous benchmarks.&nbsp;



According to the <a href="https://wmo.int/" target="_blank" rel="noreferrer noopener">World Meteorological Organization</a>, the temperature anomalies between June 2023 and September 2024 were so far beyond typical year-to-year variability that experts called it an “unprecedented streak,” with 2024 now on track to be the warmest year ever documented.



“Warming in 2023 was head-and-shoulders above any other year, and 2024 will be as well,” said Gavin Schmidt, director of the <a href="https://www.giss.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA Goddard Institute for Space Studies</a>. "I wish I knew why, but I don’t. We’re still in the process of assessing what happened and if we are seeing a shift in how the climate system operates.”



While all scientists agree that <a href="https://www.earth.com/news/greenhouse-gas-emissions-reach-another-all-time-high/" target="_blank" rel="noreferrer noopener">greenhouse gases</a> from fossil fuel use remain the primary driver of Earth’s overall warming trend, they are still debating how to explain this short-term explosion in global temperatures.&nbsp;



Changes in cloud patterns, air pollution, and the planet’s capacity to store carbon are among the suspected contributors, but experts believe it may take at least another year or two to fully untangle the puzzle.



<h2 class="wp-block-heading" id="h-uncharted-territory-in-climate-records">“Uncharted territory” in climate records</h2>



Climate specialists characterize the past two years as pushing the planet “well into uncharted territory,” a phrase used by Richard Allan, a climate scientist from the University of Reading in the UK.&nbsp;



The magnitude of recent warming has tested established climate models, placing it, according to climatologist Sonia Seneviratne at ETH Zurich, “at the limit of what we would expect based on existing climate models.”&nbsp;



At the same time, Seneviratne emphasized that rising fossil fuel emissions make long-term warming trends wholly unsurprising.



So how is it that temperatures became so anomalous? Early theories focus on how natural climate variability has intersected with human-driven warming.&nbsp;



One factor is the unusually strong shift from a rare, three-year La Niña - which generally cools the planet by sending additional heat into the deep oceans - to a warming El Niño event that started in mid-2023, releasing stored energy back into the atmosphere.&nbsp;



While this helps explain some portion of the spike, temperatures remained persistently high even after <a href="https://www.earth.com/news/el-nino-event-may-push-earth-towards-its-hottest-year-ever/" target="_blank" rel="noreferrer noopener">El Niño</a> peaked in January.



“It is difficult to explain this at the moment,” said Robert Vautard, a member of the <a href="https://www.ipcc.ch/" target="_blank" rel="noreferrer noopener">Intergovernmental Panel on Climate Change</a> (IPCC). “We lack a bit of perspective. If temperatures do not drop more sharply in 2025, we will really have to ask ourselves questions about the cause.”



<h2 class="wp-block-heading" id="h-factors-contributing-to-the-heat-surge">Factors contributing to the heat surge</h2>



Amid these extraordinary conditions, scientists have zeroed in on multiple theories that go beyond El Niño.



<h3 class="wp-block-heading" id="h-shifts-in-airborne-pollution">Shifts in airborne pollution</h3>



A global shift to cleaner shipping fuels around 2020 might have slashed emissions of sulfur compounds that ordinarily create reflective, mirror-like clouds in shipping lanes.&nbsp;



With fewer sulfur aerosols, more sunlight could be reaching the Earth’s surface, potentially accelerating warming.



<h3 class="wp-block-heading" id="h-reduction-in-low-lying-clouds-nbsp">Reduction in low-lying clouds&nbsp;</h3>



A peer-reviewed study proposed that a global decline in low-lying clouds might have allowed extra solar radiation to heat the surface, but establishing consistent data across the planet remains challenging.



<h3 class="wp-block-heading" id="h-weakening-of-carbon-sinks-nbsp">Weakening of carbon sinks&nbsp;</h3>



Forests and oceans, traditionally known to absorb much of humanity’s carbon emissions, showed signs of stress in 2023. Scientists described this as an “unprecedented weakening” of Earth’s <a href="https://www.earth.com/news/mountains-both-carbon-sinks-and-carbon-sources/" target="_blank" rel="noreferrer noopener">carbon sinks</a>, suggesting the planet’s ability to store CO₂ might be faltering.&nbsp;



If sinks become less effective at capturing carbon, warming could speed up beyond current estimates.



<h3 class="wp-block-heading" id="h-arctic-tundra-emissions-nbsp">Arctic tundra emissions&nbsp;</h3>



In December, the <a href="https://www.noaa.gov/" target="_blank" rel="noreferrer noopener">U.S. National Oceanic and Atmospheric Administration</a> reported that Arctic tundra, which has locked away carbon dioxide for millennia, has begun releasing more CO₂ than it captures.&nbsp;



Such a shift, scientists warn, might tip the balance of the global carbon cycle, further feeding into accelerated warming.



None of these hypotheses alone fully accounts for the heat surge, prompting climate experts to suspect the convergence of multiple factors.&nbsp;



“We cannot exclude that some other factors also further amplified the temperatures... the verdict is still out,” said Seneviratne.



<h2 class="wp-block-heading" id="h-at-odds-with-climate-models">At odds with climate models</h2>



Climate models, which have reliably simulated broad, decades-long warming trends, appear to have underestimated just how extreme and enduring this recent heat streak would be.&nbsp;



“What occurred was at the limit of what we would expect based on existing climate models,” Seneviratne said. Some experts worry that if any key feedbacks or phenomena were missing from these models, the planet could be approaching a threshold of more profound, potentially less reversible changes.



Johan Rockström, director of the <a href="https://www.pik-potsdam.de/en/home" target="_blank" rel="noreferrer noopener">Potsdam Institute for Climate Impact Research</a>, voiced concerns about rapidly warming oceans, which have long served as massive heat and carbon sinks.&nbsp;



“Oceans are warming at a rate scientists cannot fully explain,” he said last month. “Could this be a first sign of a planet starting to show a loss of resilience? We cannot exclude it.”



<h2 class="wp-block-heading" id="h-a-warning-for-what-may-lie-ahead">A warning for what may lie ahead</h2>



Record-high temperatures in 2023 and 2024 offer a stark reminder of the fragility of Earth’s climate system.&nbsp;



Although some interplay of El Niño, cloud cover, and carbon sink changes may explain part of the observed heat, the fundamental driver remains human emissions of greenhouse gases from fossil fuels.&nbsp;



Even if the dramatic peak fades in coming months, the possibility persists that Earth’s temperature baseline has permanently ratcheted up, edging us closer to thresholds that portend more dangerous extremes.



For many climate experts, these heat surges serve as yet another clarion call to reduce emissions swiftly, to develop robust adaptation strategies, and to keep monitoring the climate system’s every nuance. 



If the current anomalies hint at hidden processes at work - like a weakening Arctic tundra sink or oceanic shifts - policy decisions made now to cut emissions and preserve resilience could become all the more consequential.



Vautard emphasized that if the climate doesn’t cool off more sharply in 2025, it would prompt scientists to reevaluate their assumptions about the interplay of natural and human-driven factors - perhaps indicating a more profound shift in how our climate operates.&nbsp;



In this uncertain scenario, building deeper scientific understanding becomes ever more urgent.



<h2 class="wp-block-heading" id="h-building-resilience-against-future-heat-surges">Building resilience against future heat surges</h2>



Although the short-term temperature surge has challenged existing forecasts, the broader climate consensus remains intact: Earth is warming at an alarming rate, primarily due to carbon dioxide and other greenhouse gases.&nbsp;



This abrupt heat wave may be a harbinger of future extremes, or possibly just a short-lived but jarring deviation from expected patterns.&nbsp;



Determining which is the case will likely require another year or two of data, plus renewed efforts to bolster climate observation networks, refine models, and capture nuanced processes in the oceans, atmosphere, and polar regions.



No matter the final explanation, the world’s experience over the last two years underscores the climate’s capacity to surprise - sometimes by margins that drastically shift our sense of what is “normal.”&nbsp;



For policymakers, this event highlights both the urgency of emission cuts and the importance of resilience-building measures against more frequent or severe heat surges.&nbsp;



For scientists, the anomaly reveals how much is still left to learn about the planet’s complex interplay of feedbacks and stresses.



“We’re still in the process of assessing what happened and if we are seeing a shift in how the climate system operates,” Schmidt said.&nbsp;



Whether this remarkable episode proves to be a short detour or a glimpse of a new reality, it adds fresh impetus to the effort to better predict, manage, and mitigate the precarious path Earth is on.



-----



Like what you read? <a href="https://www.earth.com/subscribe/" target="_blank" rel="noreferrer noopener">Subscribe to our newsletter</a> for engaging articles, exclusive content, and the latest updates.



Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.linkedin.com/in/eric-ralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.



-----

Puzzling heat surge pushes Earth’s climate to new extremes

For many decades, scientists have documented how burning fossil fuels...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="0ynNMYkMKa-2340414-12187" type="single"]</div>



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



---



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...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"]</div>



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;



---



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...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="3upvlAaHgO-2256633-12187" type="single"]</div>



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;



---



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...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"]</div>



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;



---



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



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

Detecting mercury contamination with the tap of a finger

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

<div class="wp-block-sendtonews-playerselector">[sendtonews key="iuA5mpp3jv-1641775-12187" type="single"]</div>



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;



---



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...

<div class="wp-block-sendtonews-playerselector">[sendtonews key="QGPzYnXEtN-1712599-12187" type="single"]</div>



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



---



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...

Two very different sides of the Himalayas. Today&#8217;s Image of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> shows the remarkable contrast between the sparsely populated Tibetan Plateau and the densely populated North Indian River Plain. 
The brightly lit network of cities south of the Himalayas includes New Delhi, India, and Lahore, Pakistan. Enriched by the Indus and the Ganges rivers, this agriculturally fertile area is one of the most densely populated regions on Earth. It is currently home to more than 400 million people. Two very different sides of the Himalayas. 
The Tibetan Plateau, also known as the &#8220;Roof of the World,&#8221; is located 14,764 feet above sea level on the other side of the Himalayas. The high altitude conditions are not conducive to extensive human settlement, and the Indigenous people who live on the Tibetan Plateau are acclimated to the harsh climate. 
Lifted by the <a title="Subduction" href="https://en.wikipedia.org/wiki/Subduction">subduction</a> of the <a title="Indian Plate" href="https://en.wikipedia.org/wiki/Indian_Plate">Indian tectonic plate</a> under the <a title="Eurasian Plate" href="https://en.wikipedia.org/wiki/Eurasian_Plate">Eurasian Plate</a>, the Himalayan mountain range runs west-northwest to east-southeast in an arc 2,400 km (1,500 mi) long. Its western anchor, <a title="Nanga Parbat" href="https://en.wikipedia.org/wiki/Nanga_Parbat">Nanga Parbat</a>, lies just south of the northernmost bend of the Indus river. Its eastern anchor, <a title="Namcha Barwa" href="https://en.wikipedia.org/wiki/Namcha_Barwa">Namcha Barwa</a>, is just west of the great bend of the <a class="mw-redirect" title="Yarlung Tsangpo River" href="https://en.wikipedia.org/wiki/Yarlung_Tsangpo_River">Yarlung Tsangpo River</a> (upper stream of the <a title="Brahmaputra River" href="https://en.wikipedia.org/wiki/Brahmaputra_River">Brahmaputra River</a>). The Himalayan range is bordered on the northwest by the <a title="Karakoram" href="https://en.wikipedia.org/wiki/Karakoram">Karakoram</a> and the <a title="Hindu Kush" href="https://en.wikipedia.org/wiki/Hindu_Kush">Hindu Kush</a> ranges.
Image Credit: NASA Earth Observatory 
&#8212;
By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Two very different sides of the Himalayas

Lake Rukwa in Tanzania. Today's Image of the Day from <a href="https://www.nasa.gov/">NASA Earth Observatory</a> features Lake Rukwa in the East African country of Tanzania.

Spanning an area of about 1,000 square miles, Rukwa is one of the smaller lakes that has formed in the East African Rift, which is essentially a fracture in the Earth that widens over time. 

According to NASA, lakes in this rift area occupy deep depressions in Earth’s crust.

The image was captured in March of 2020 by an astronaut onboard the International Space Station.

---

The lake has seen large fluctuations in its size over the years, due to varying inflow of streams. Currently it is about 180 kilometres (110 mi) long and averages about 32 kilometres (20 mi) wide, making it about 5,760 square kilometres (2,220 sq mi) in size. In 1929 it was only about 48 kilometres (30 mi) long, but in 1939 it was about 128 kilometres (80 mi) long and 40 kilometres (25 mi) wide. During the early rifting of this part of Africa, the basin of Lake Rukwa may at times have been part of a much larger basin which also included the basins of Lake Tanganyika with Lake Malawi; ancient shorelines suggest a final date of overflow into Lake Tanganyika of 33,000BP.  For overflow to occur again, the lake's elevation would need to exceed 900 meters. Overflow into Lake Malawi is not possible now, since the pass between the two basin stands at over 2000 meters elevation. (Neither Lake Tanganyika nor Lake Malawi can overflow into Lake Rukwa since they already overflow into the Atlantic and Indian Oceans respectively.)

&nbsp;

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: NASA Earth Observatory

&nbsp;

 

&nbsp;