Today’s Image of the Day comes courtesy of the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> and features a look at meltwater channels on Ellesmere Island in the Canadian Arctic Archipelago. 
This photo was captured by sea ice scientist Jeremy Harbeck of NASA’s <a href="https://www.nasa.gov/mission_pages/icebridge/index.html">Operation IceBridge</a>, which is responsible for collecting important surveys of polar ice and snow. The image captures stunning meltwater channels on the DeVries Glacier. Ice caps like this one have been significantly shrinking in size as the <a href="https://www.earth.com/news/climate-change-arctic-atlantic/">climate</a> continues to warm.
Ellesmere Island is the northernmost portion of Canada’s Queen Elizabeth Islands. Measuring in at 75,767 square miles, it is the tenth largest island on the planet. 
&#8212;
By <a href="mailto:rarnold@earth.com">Rory Arnold</a>, <a href="https://www.earth.com/staff">Earth.com</a>
Source: Jeremy Harbeck, <a href="https://earthobservatory.nasa.gov/IOTD/view.php?id=90004&amp;eocn=home&amp;eoci=iotd_title">NASA Earth Observatory </a>

Meltwater channels on Ellesmere Island

Today's Image of the Day from the European Space Agency features a Copernicus Sentinel-2 photograph of South Georgia, a remote and rugged island located in the southern Atlantic Ocean. 



"Linked with the South Sandwich Islands to form a British Overseas Territory, this southern Atlantic island is a haven for a vast array of wildlife," said <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.



"Around five million seals call the islands home, as well as 65 million birds of 30 different species. Migrating whales and various fish species populate the surrounding waters and there is a large penguin population."



<h2 class="wp-block-heading" id="h-climate-and-wildlife-of-south-georgia">Climate and wildlife of South Georgia </h2>



The island is dominated by mountains, glaciers, and fjords. Its highest peak, Mount Paget, rises to 2,935 meters, making it one of the tallest in the region.



South Georgia’s location within the Antarctic Convergence gives it a cold, maritime climate. Although not part of the Antarctic Treaty System, its environment and <a href="https://www.earth.com/news/conservation-efforts-are-not-enough-to-save-antarctic-wildlife/" target="_blank" rel="noreferrer noopener">wildlife</a> are closely linked to Antarctica. 



The island is home to vast colonies of penguins, seals, and seabirds. The surrounding waters are rich with krill, providing an abundant food source for marine life.



<h2 class="wp-block-heading" id="h-penguins-adapted-to-harsh-environments">Penguins adapted to harsh environments </h2>



The most notable species found here are the king penguins, which are the second-largest penguin species in the world. South Georgia also hosts large populations of <a href="https://www.earth.com/news/what-makes-the-gentoo-penguin-the-worlds-fastest-swimming-bird/" target="_blank" rel="noreferrer noopener">gentoo</a> and macaroni penguins. 



The island's harsh climate, characterized by strong winds, snow, and cold temperatures, makes it a tough environment, but the penguins have adapted well. 



Their colonies - some of which number in the hundreds of thousands - can be found along the island's rugged coasts and beaches. 



The island’s isolation, combined with its plentiful food supply, makes it a critical breeding ground for these penguins.



<h2 class="wp-block-heading" id="h-history-of-south-georgia">History of South Georgia </h2>



The island has a history of exploration and exploitation. Captain James Cook first claimed South Georgia for Britain in 1775. 



During the late 19th and early 20th centuries, it became a hub for the <a href="https://www.earth.com/news/echoes-of-the-past-whalings-long-term-impact-on-genetic-diversity/" target="_blank" rel="noreferrer noopener">whaling</a> industry, with stations like Grytviken serving as operational centers. These stations have since been abandoned, and the island is now a haven for scientific research and ecotourism.



South Georgia is also notable for its role in Ernest Shackleton’s famed Endurance expedition. His crew reached the island in 1916 after an extraordinary open-boat journey from Elephant Island. Shackleton later died on South Georgia in 1922 and is buried in Grytviken.



<h2 class="wp-block-heading" id="h-pristine-nature-of-the-island">Pristine nature of the island</h2>



Today, South Georgia is a focus of conservation efforts. The eradication of invasive species, such as rats and reindeer, has been a significant success, allowing native wildlife to recover. 



Rats and mice were responsible for the decline of ground-nesting birds, including the South Georgia pipit, the island's only endemic bird. 



<a href="https://www.earth.com/news/reindeer-use-ultraviolet-vision-to-find-food-in-the-winter/" target="_blank" rel="noreferrer noopener">Reindeer</a>, which had been introduced for farming in the 19th century, caused extensive damage to the island’s vegetation, disrupting the habitat for native species.



South Georgia is uninhabited except for a small number of scientists and staff working at research stations and administrative facilities, emphasizing its role as a protected wilderness area and an essential site for understanding global environmental changes.



Its uninhabited status has helped preserve its pristine nature. Visitors to South Georgia must follow strict environmental guidelines to minimize human impact on this extraordinary island.



<h2 class="wp-block-heading" id="h-scientific-significance-of-remote-islands">Scientific significance of remote islands </h2>



Remote <a href="https://www.earth.com/news/plant-life-on-islands-loses-diversity-when-humans-arrive/" target="_blank" rel="noreferrer noopener">islands</a> are scientifically significant for several reasons. They often serve as unique ecosystems that can provide insights into evolutionary processes, biodiversity, and adaptation. 



Due to their isolation, species on remote islands may evolve differently from their mainland counterparts, resulting in the development of endemic species that exist nowhere else in the world. 



These islands also act as natural laboratories for studying the effects of climate change, human activity, and ecological interactions, as they are more vulnerable to disturbances. 



Moreover, remote islands can offer valuable information on the health of marine and terrestrial ecosystems, as their ecosystems are often less impacted by human-induced factors. This makes them ideal for studying natural processes in relatively undisturbed environments. 



The isolation of these islands can also help scientists study the patterns of species migration, colonization, and extinction.



Image Credit: ESA 



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South Georgia: One of the most remote islands in the world

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

Today's Image of the Day from NASA Earth Observatory features the Messak Settafet, a rocky plateau located in the central Sahara Desert. It is part of the greater Messak Plateau, which stretches between the Erg Uan Kasa and the Murzuq Sand Sea.&nbsp;



The plateau's surface is characterized by blackened sandstone, sculpted by thousands of years of wind erosion. This dark patina, often referred to as "desert varnish," adds to its distinctive appearance. The region is starkly beautiful but harsh, with extreme temperatures and minimal <a href="https://www.earth.com/news/even-desert-plants-are-not-immune-to-climate-stress/" target="_blank" rel="noreferrer noopener">vegetation</a>.



<h2 class="wp-block-heading" id="h-image-of-the-messak-settafet">Image of the Messak Settafet</h2>



“Towering over the desert in southwestern Libya, the Messak Settafet plateau resembles the wall of a giant fortress, with its dark, erosion-resistant sandstone separating the Ubari Sand Sea to the north and the Marzūq Sand Sea to the south,” noted NASA.



“The large outcrop of Cretaceous rock features a sharp escarpment on its north side. The cliff, some 300 meters (1,000 feet) high in places, is lined with a thin dark shadow.”&nbsp;



“Dark debris from rockfalls is visible to the north. Note that an optical illusion called relief inversion can make high-elevation areas appear low and vice versa when shadows appear on the northern side of a feature.”



<h2 class="wp-block-heading" id="h-archaeological-significance-of-the-plateau-nbsp">Archaeological significance of the plateau&nbsp;</h2>



Messak Settafet is often referred to as the "land of stone tools" because it is one of the world's largest sites for prehistoric tools.&nbsp;



The area is littered with countless <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fstone-tool-discovery-challenges-entire-theory-of-human-evolution%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">stone tools</a> and artifacts dating back to various prehistoric periods, including the Acheulean and Neolithic. These tools offer insights into early human technology and adaptation to desert environments.



“Signs of ancient tool making cover much of the plateau’s surface,” said <a href="https://www.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>. “According to one archaeological survey, people discarded so many stone tools and rock fragments on the plateau over hundreds of thousands of years that roughly 75 artifacts per square meter now carpet the surface.”&nbsp;



“That makes this one of the earliest known examples of hominins modifying an entire landscape, according to the University of Cambridge archaeologists who conducted the survey.”



“Other signs of ancient activity include the bright spots that dot the image. These areas were likely quarrying pits where people dug up rocks and crafted them into tools, the archaeologists reported.”&nbsp;



<h2 class="wp-block-heading" id="h-rock-art-on-the-plateau-nbsp">Rock art on the plateau&nbsp;</h2>



The plateau is home to numerous petroglyphs and <a href="https://www.earth.com/news/negev-petroglyphs-ancient-art-rock-carvings-face-erosion-fungi-lichens/" target="_blank" rel="noreferrer noopener">carvings</a>. These engravings depict animals, humans, and symbolic designs, providing valuable clues about the lives, beliefs, and environments of the region's ancient inhabitants.&nbsp;



“For instance, Wadi Mathendous, a prehistoric archaeological site located in the southern part of the plateau, contains engravings of rhinoceroses, crocodiles, hippopotamuses, fighting cats, giraffes, long-horned buffaloes, and elephants. The art is thought to be about 8,000 years old,” said NASA.



Some of the animals depicted, such as giraffes and elephants, indicate that the Sahara was once a <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fa-lush-green-sahara-desert-helped-early-humans-migrate-out-of-africa%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">much wetter</a> and more hospitable environment.



<h2 class="wp-block-heading" id="h-cultural-significance-of-the-messak-settafet">Cultural significance of the Messak Settafet</h2>



Messak Settafet forms part of the Rock-Art Sites of Tadrart Acacus, a UNESCO World Heritage Site since 1985. This designation highlights the area's importance for understanding early human culture and environmental changes in the Sahara.



The plateau has been a critical area for studying the migration and adaptation of early humans. Its archaeological richness offers a glimpse into how humans thrived in this region during periods when the climate was wetter.



“Although the plateau now receives less than 0.4 inches of rain annually, clues in the landscape make clear it was once much wetter,” noted NASA.



“Deeply incised dried stream valleys, or wadis, crisscross the plateau, indicating significant past water flow. The small, bright features scattered across the plateau are sand and silt deposits left where water once pooled.”



The Messak Settafet, like many remote <a href="https://www.earth.com/news/sahara-desert-dust-storms-carry-harmful-bacteria-and-fungi-around-the-globe/" target="_blank" rel="noreferrer noopener">desert</a> regions, faces challenges such as erosion, vandalism of ancient rock art, and the potential impacts of development. 



Efforts to preserve its archaeological treasures are vital for protecting its cultural and scientific significance.



The image was captured November 17, 2024 by the Operational Land Imager-2 (OLI-2) on Landsat 9 on&nbsp;



Image Credit: NASA Earth Observatory



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Messak Settafet plateau in the Sahara Desert

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

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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Spiral galaxy NGC 6744 in the constellation Pavo

Today's Image of the Day from the European Space Agency features a pair of interacting spiral galaxies known as the Antennae Galaxies. They are located approximately 45 million light-years away in the constellation Corvus.&nbsp;



<h2 class="wp-block-heading" id="h-antennae-galaxies-in-a-deadly-embrace">Antennae Galaxies in a deadly embrace </h2>



“The NASA/ESA Hubble Space Telescope has snapped the best ever image of the Antennae Galaxies. Hubble has released images of these stunning galaxies twice before, once using observations from its Wide Field and Planetary Camera 2 (WFPC2) in 1997, and again in 2006 from the Advanced Camera for Surveys (ACS),” noted <a href="https://esahubble.org/images/potw1345a/" target="_blank" rel="noreferrer noopener">ESA</a>.



“The galaxies - also known as NGC 4038 and NGC 4039 - are locked in a deadly embrace. Once normal, sedate spiral galaxies like the Milky Way, the pair have spent the past few hundred million years sparring with one another.”



According to ESA, the clash of the Antennae Galaxies is so violent that stars have been ripped from their host <a href="https://www.earth.com/news/galaxy-collision-2-million-mph-stephans-quintet-captured-unprecedented-detail/" target="_blank" rel="noreferrer noopener">galaxies</a> to form a streaming arc between the two.&nbsp;



The name "Antennae" comes from this long stream of stars and gas, which resembles insect antennae.



<h2 class="wp-block-heading" id="h-intense-bursts-of-star-formation-nbsp">Intense bursts of star formation&nbsp;</h2>



The collision has triggered intense bursts of star formation, making the Antennae Galaxies one of the nearest and most dramatic examples of a starburst galaxy.&nbsp;



Many of the newly formed stars are concentrated in massive star clusters, some of which are expected to evolve into globular clusters over millions of years.



“This new image of the Antennae Galaxies shows obvious signs of chaos. Clouds of gas are seen in bright pink and red, surrounding the bright flashes of blue star-forming regions - some of which are partially obscured by dark patches of dust,” explained ESA.



“The rate of star formation is so high that the Antennae Galaxies are said to be in a state of starburst, a period in which all of the gas within the galaxies is being used to form stars.”&nbsp;



“This cannot last forever and neither can the separate galaxies; eventually the nuclei will coalesce, and the galaxies will begin their retirement together as one large elliptical galaxy.”



<h2 class="wp-block-heading" id="h-significance-of-the-antennae-galaxies">Significance of the Antennae Galaxies</h2>



The Antennae Galaxies are one of the most well-studied examples of galaxy collisions, offering insight into the processes that shape galaxies over time.



Astronomers study the Antennae Galaxies using a range of telescopes across different wavelengths, including visible light, infrared, and X-rays.&nbsp;



Observations in X-rays have revealed evidence of supernovae and <a href="https://www.earth.com/news/black-holes-may-talk-to-galaxies-through-energetic-winds/" target="_blank" rel="noreferrer noopener">black holes</a>, while infrared studies highlight regions of dust and star formation.&nbsp;



<h2 class="wp-block-heading" id="h-the-milky-way-s-collision-course-nbsp">The Milky Way's collision course&nbsp;</h2>



The Antennae Galaxies provide a glimpse into the future of our <a href="https://www.earth.com/news/uma3-u1-faintest-star-system-found-orbiting-milky-way-galaxy/" target="_blank" rel="noreferrer noopener">Milky Way</a>, which is expected to eventually merge with the Andromeda Galaxy - our closest spiral galaxy neighbor.



The cosmic collision course of the Milky Way and Andromeda will reshape both galaxies over billions of years.&nbsp;



This event is expected to occur in about 4.5 billion years. Both galaxies are part of the Local Group, a cluster of galaxies bound together by gravity. Their mutual gravitational pull is drawing them closer at a speed of approximately 110 kilometers per second.



<h2 class="wp-block-heading" id="h-the-birth-of-an-elliptical-galaxy-nbsp">The birth of an elliptical galaxy&nbsp;</h2>



When the two galaxies collide, their individual stars will largely avoid direct collisions due to the vast distances between them. However, the gravitational forces involved will create dramatic effects.&nbsp;



These forces will distort the galaxies' <a href="https://www.earth.com/news/shapes-of-one-million-galaxies-hint-at-the-universes-origins/" target="_blank" rel="noreferrer noopener">shapes</a>, triggering intense bursts of star formation as gas clouds collide and compress. Over time, the galaxies will settle into a new, larger elliptical galaxy often referred to as "Milkomeda" or "Milkdromeda" by astronomers.



<h2 class="wp-block-heading" id="h-galaxy-merger-and-the-solar-system">Galaxy merger and the solar system</h2>



Despite the seemingly destructive nature of the collision, the solar system is unlikely to face direct harm. Our Sun may find itself flung into a new orbit within the merged galaxy or even cast into intergalactic space.&nbsp;



The merger will also significantly alter the night sky, with the Andromeda Galaxy becoming increasingly prominent before blending into the unified structure.



This event is part of the natural <a href="https://www.earth.com/news/galaxies-are-much-bigger-than-we-originally-believed-gas-clouds/" target="_blank" rel="noreferrer noopener">evolution of galaxies</a> and serves as a fascinating reminder of the dynamic and ever-changing nature of the universe. 



While the collision is still billions of years away, studying it helps astronomers understand galactic interactions and the long-term future of our cosmic neighborhood.



Image Credit: ESA/Hubble &amp; NASA



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The violent clash of the Antennae Galaxies  

Today's Image of the Day from the European Space Agency features a compilation of European cities that resemble stars. 



“Star-shaped cities are scattered across Europe, their geometric designs most appreciated when viewed from above,” noted <a href="https://www.esa.int/ESA_Multimedia/Images/2024/12/Earth_from_Space_Star_cities" target="_blank" rel="noreferrer noopener">ESA</a>. 



<h2 class="wp-block-heading" id="h-development-of-star-shaped-cities">Development of star-shaped cities</h2>



The development of star-shaped fortresses, also known as bastion forts, emerged during the Renaissance in Italy as a response to the rapidly evolving art of <a href="https://www.earth.com/news/migrating-eagles-have-been-rerouted-by-the-war-in-ukraine/" target="_blank" rel="noreferrer noopener">warfare</a>.&nbsp;



Traditional medieval fortifications, characterized by high, straight walls and square towers, became vulnerable with the advent of gunpowder weaponry. Cannons could easily reduce these structures to rubble, rendering them obsolete.



The star-shaped design addressed these vulnerabilities by incorporating wide moats and projecting bastions - angled structures that jutted outward from the main walls.&nbsp;



These bastions provided overlapping fields of fire, allowing defenders to cover blind spots and effectively repel attackers attempting to approach or scale the walls.&nbsp;



Additionally, the sloped walls of these fortresses, known as glacis, were designed to deflect cannonballs rather than absorb their impact, further enhancing their resilience.



This innovative design not only improved defensive capabilities but also transformed the battlefield, forcing attackers to develop new siege techniques. It marked a pivotal moment in military engineering, influencing fortress construction across Europe and beyond for centuries.



<h2 class="wp-block-heading" id="h-examples-of-star-shaped-cities">Examples of star-shaped cities</h2>



“Four examples of such cities can be seen here, arranged clockwise from the top left: Bourtange in the Netherlands, Palmanova in Italy, Almeida in Portugal, and Neuf-Brisach in France,” said ESA.



“The green and red hues evoke a Christmas vibe, achieved through different band combinations during image processing to generate true-color (green) and false-color (red) visuals.”



<h3 class="wp-block-heading" id="h-bourtange-netherlands">Bourtange, Netherlands </h3>



Fort Bourtange, nestled in the picturesque countryside of northeast Netherlands near the German border, is a remarkable example of Renaissance military architecture and urban planning.&nbsp;



Constructed in 1593 during the Eighty Years' War, it was strategically positioned to control the only road linking Germany to the Dutch city of Groningen - a vital route for military and trade purposes.&nbsp;



Its unique pentagonal, star-shaped design featured angled bastions, wide moats, and interconnected defensive structures, making it nearly impenetrable to enemy forces equipped with the era's artillery.



In 1851, after centuries of military service, Fort Bourtange was decommissioned and transformed into a peaceful village.&nbsp;



Despite the change in purpose, its original geometric layout, defined by precise angles and symmetrical patterns, remained intact. The pentagonal walls, surrounding waterways, and radial street design continue to showcase the ingenuity of its designers.



<h3 class="wp-block-heading" id="h-palmanova-italy">Palmanova, Italy </h3>



Palmanova, located in the Friuli-Venezia Giulia region of northeast Italy, is a masterpiece of Renaissance urban and military planning.&nbsp;



Designated as a UNESCO World Heritage site, it exemplifies the idealized city envisioned during the late Renaissance, combining beauty, functionality, and <a href="https://www.earth.com/news/preparing-u-s-military-bases-for-sea-level-rise/" target="_blank" rel="noreferrer noopener">military</a> innovation.&nbsp;



Constructed in 1593 by the Republic of Venice, Palmanova was strategically designed to protect the Republic’s northeastern borders from external threats - particularly the Ottoman Empire.



The city’s layout embodies the principles of symmetry and order characteristic of the Renaissance. Its unique radial design spreads out from the central hexagonal square, known as Piazza Grande or Piazza del Duomo, which serves as the civic and social heart of the city.&nbsp;



From this central hub, six straight avenues fan outward, connecting the square to the surrounding neighborhoods and gates. This design was not only aesthetically pleasing but also practical, allowing for efficient movement and communication within the city.



Today, Palmanova is celebrated not only for its historical and architectural significance but also as a rare example of a perfectly preserved star fortress.&nbsp;



<h3 class="wp-block-heading" id="h-almeida-portugal-nbsp">Almeida, Portugal&nbsp;</h3>



Perched on a high plain in northeast Portugal near the Spanish border, the fortress of Almeida is a striking example of military engineering and a symbol of Portugal’s resilience.&nbsp;



Built to secure the nation’s eastern frontier, Almeida has played a significant role in Portuguese history, particularly during its early years of independence and throughout various military conflicts, including the Peninsular War.



The fortress's defining star-shaped ramparts consist of twelve points, each projecting outward to eliminate blind spots and provide overlapping fields of fire against advancing enemies.&nbsp;



The thick walls, surrounding moats, and angular bastions made Almeida a formidable stronghold capable of withstanding prolonged sieges.



<h3 class="wp-block-heading" id="h-neuf-brisach-france">Neuf-Brisach, France</h3>



Neuf-Brisach, located in the Alsace region of northeastern <a href="https://www.earth.com/news/470-million-year-old-animal-fossils-discovered-in-frances-cabrieres-biota/" target="_blank" rel="noreferrer noopener">France</a> near the German border, is another fascinating example of military and urban design.&nbsp;



The town was constructed in 1697 after the loss of Breisach, which stood on the opposite bank of the Rhine River in Germany.&nbsp;



The name "Neuf" (meaning "new" in French) reflects its creation as a strategic replacement and fortification to strengthen France's defense along its eastern border.



Designed by Sébastien Le Prestre de Vauban, the renowned military engineer under King Louis XIV, Neuf-Brisach is part of the extensive network of fortifications that Vauban designed to protect France from external threats.&nbsp;



Vauban's expertise in defensive architecture is evident in the town's star-shaped layout, which was intended to optimize defense while accommodating civilian life within the fortifications.&nbsp;



The fortifications were built to withstand sieges and were strategically positioned to control movement across the Rhine River and defend against potential invasions. The outer star-shaped ramparts extend in a way that creates a nearly impenetrable defensive perimeter.



Image Credit: European Space Agency&nbsp;



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Star-shaped cities scattered across Europe

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



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

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



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Retreating glaciers and expanding meltwater lakes in Alaska

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;



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Mountain peaks and plains of central Mongolia 

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

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

Heavy snow and cloud cover in the Alps

Monitoring Earth Changes with MODIS

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

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

A frozen Lake Erie in February

Aqua Earth Observing Satellite

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

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

Super Typhoon Noru in the Pacific Ocean

Incredible Images of Earth from Space

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

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

Northern Italy from the Space Station

Photos from the International Space Station

You’ve likely heard of the Great Wall of China, that stone and brick marvel of fortifications that stretches vast distances across the historical border of northern China. But have you heard of the Great Green Wall of China?



Unlike its ancient counterpart, this is a living, breathing wall of greenery - a massive tree-planting initiative aimed at combating desertification on the edge of the Gobi Desert.



Recently, the Great Green Wall reached a pivotal milestone, marking over four decades of relentless effort to transform arid landscapes into thriving ecosystems.



<h2 class="wp-block-heading" id="h-great-green-wall-encircles-the-desert">Great Green Wall encircles the desert</h2>



Late last year, dedicated workers in the northwest autonomous region of Xinjiang triumphantly finished a roughly 2,000-mile "green belt" that encircles the infamous Taklimakan Desert.



Often referred to as the "Sea of Death," the Taklimakan is the nation's largest desert, and this initiative is a component of the bigger Three-North Shelterbelt Forest Program - also known as the Great Green Wall of China.



Since its inception in 1978, this effort symbolizes one of the globe's most comprehensive <a href="https://www.earth.com/news/planting-trees-is-important-but-reforestation-can-help-too/" target="_blank" rel="noreferrer noopener">planting</a> missions.



<h2 class="wp-block-heading" id="h-china-s-great-green-wall-expansion">China's Great Green Wall expansion</h2>



China's verdant endeavor is on track to span 13 provinces, covering a whopping 1.5 million square miles (3.9 million square kilometers) and a hefty 42% of the country's land area by mid-century, according to government resources.



The program's aspirations include protecting China from the northern sandstorms and halting the encroachment of <a href="https://www.earth.com/news/floods-are-becoming-more-deadly-in-the-desert/" target="_blank" rel="noreferrer noopener">deserts</a> such as the one in Xinjiang.



Upon completion of the Taklimakan section, an impressive 116,000 square miles (300,000 square kilometers) of <a href="https://www.earth.com/news/trees-struggling-to-breathe-store-co2-hotter-climate/" target="_blank" rel="noreferrer noopener">trees</a> had been planted, significantly boosting China's forest coverage from a mere 10% in 1949 to an expected 25% by 2023. Particularly in Xinjiang, forest coverage has leaped from 1% to 5% in 40 years.



<h2 class="wp-block-heading" id="h-improving-economic-stability">Improving economic stability </h2>



Distinct from the similarly ambitious <a href="https://www.earth.com/news/africas-great-green-wall-is-economically-worthwhile/" target="_blank" rel="noreferrer noopener">Great Green Wall in Africa</a>, China's program has already gained considerable success, with government sources stating that it is "improving ecological stability and supporting the local communities."



Farmers in the dry northern regions have reaped visible benefits. Wang Yinji, a farmer in the northwest Gansu province, has seen significant improvements since 1999 when the tree-planting efforts escalated.



"Our corn grew taller. The sand that used to blow in from the east and northeast was stopped," said Wang.



Through the years, the campaign has skilfully rallied workers and volunteers. The project has also explored the plant species best suited to desert conditions.



<h2 class="wp-block-heading" id="h-challenges-of-the-great-green-wall">Challenges of the Great Green Wall</h2>



However, the initiative isn't without its critics. Some have argued that the program hasn't curtailed sandstorms in Beijing, and others have scrutinized the low survival rates of the planted trees.



Critics have also argued that the planted trees compete with agricultural activities for the use of water and land. Yet, many believe in the value of tree-planting amidst increasing global warming and erratic weather patterns.



"The completion of the Taklimakan Desert control project is not an end to desert control but a new beginning," said Jiang Donghui, an official in Xinjiang. "We will continue to expand the green belt … to ensure sustainable development through desert control."



<h2 class="wp-block-heading" id="h-a-blueprint-for-global-reforestation-efforts">A blueprint for global reforestation efforts</h2>



The success and challenges of the Great Green Wall of China offer valuable insights for other nations grappling with <a href="https://www.earth.com/news/oases-grow-by-human-effort-but-face-threats-from-desertification/" target="_blank" rel="noreferrer noopener">desertification</a>. 



Similar initiatives, such as Africa’s Great Green Wall project, have drawn inspiration from China's approach, emphasizing the importance of tailored strategies for local ecosystems.



China’s program demonstrates the significance of combining scientific research with community involvement to achieve long-term environmental sustainability. 



The use of drought-resistant tree species, soil stabilization techniques, and advanced irrigation systems have been key to transforming barren landscapes into fertile ecosystems.



As global climate change continues to exacerbate desertification and land degradation, the Great Green Wall serves as a reminder of the transformative power of reforestation - when backed by innovation, collaboration, and persistence.



The information for this article was published in <a href="https://english.news.cn/20241213/0073ff86fa9a4412860504c0c74f7b23/c.html">Xinhua</a>, the official news agency of the People's Republic of China



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China’s Great Green Wall has reached a new milestone

You’ve likely heard of the Great Wall of China, that...

NASA’s Parker Solar Probe has achieved an incredible feat, venturing closer to the Sun than ever before. On December 24, 2024, the spacecraft made a record-breaking approach, flying just 3.8 million miles from the Sun’s surface.



The probe is the fastest human-made object in history. Its daring journey occurred at an astonishing speed of 430,000 miles per hour.



A beacon tone received on December 26 confirmed the spacecraft’s safety and functionality, marking a significant milestone in space exploration.



<h2 class="wp-block-heading" id="h-historic-achievement-of-parker-solar-probe">Historic achievement of Parker Solar Probe</h2>



The mission represents humanity’s first attempt to “touch” a star. 



"Flying this close to the Sun is a historic moment in <a href="https://www.earth.com/news/nasas-parker-solar-probe-reaches-closest-approach-to-the-sun-perihelion-survival-unknown/" target="_blank" rel="noreferrer noopener">humanity’s first mission</a> to a star,” said Nicky Fox, Science Mission Directorate leader at <a href="https://www.nasa.gov" target="_blank" rel="noreferrer noopener">NASA</a>. 



By studying the Sun’s behavior up close, scientists hope to better understand its impact on the solar system, including effects on Earth’s technology and insights into stellar processes across the universe. 



This knowledge could aid in the search for habitable worlds beyond our planet.



<h2 class="wp-block-heading" id="h-journey-of-the-parker-solar-probe">Journey of the Parker Solar Probe</h2>



Launched in 2018, Parker Solar <a href="https://www.earth.com/news/parker-solar-probe-will-fly-through-suns-atmosphere-tomorrow-for-the-first-time/" target="_blank" rel="noreferrer noopener">Probe</a> has spent six years preparing for this achievement. Seven Venus flybys adjusted its trajectory, bringing it closer to the Sun with each orbit. The spacecraft reached its optimal orbit after its final Venus flyby on November 6, 2024.



This unique path allows Parker Solar Probe to study the Sun’s enigmatic processes every three months while maintaining a safe distance to avoid excessive heat and radiation. This orbit will remain unchanged for the duration of the mission.



“Parker Solar Probe is braving one of the most extreme environments in space and exceeding all expectations,” said Nour Rawafi, project scientist at the Johns Hopkins Applied Physics Laboratory (<a href="https://www.jhuapl.edu" target="_blank" rel="noreferrer noopener">APL</a>). 



“This mission is ushering a new golden era of space exploration, bringing us closer than ever to unlocking the Sun’s deepest and most enduring mysteries.”



<h2 class="wp-block-heading" id="h-engineering-marvel-withstanding-extreme-heat">Engineering marvel: Withstanding extreme heat</h2>



Operating in the Sun’s corona, where temperatures exceed 1 million degrees Fahrenheit, Parker Solar Probe relies on a specially designed carbon foam shield. 



This shield endures temperatures up to 2,600 degrees Fahrenheit while keeping the <a href="https://www.earth.com/news/meet-the-fastest-human-made-object-ever-nasas-parker-solar-probe/" target="_blank" rel="noreferrer noopener">spacecraft’s</a> instruments at room temperature. 



“It’s monumental to be able to get a spacecraft this close to the Sun,” said John Wirzburger, mission systems engineer at APL. 



Decades of technological advancement made this achievement possible, addressing challenges first identified in 1958.



<h2 class="wp-block-heading" id="h-rewriting-the-rules-of-solar-science">Rewriting the rules of solar science</h2>



Parker Solar Probe is rewriting the rules of solar science. By flying through the corona, it collects unprecedented data to answer longstanding questions about solar processes. 



Researchers aim to understand why the corona is so hot, how the solar wind originates, and how particles accelerate to incredible speeds.



“The data is so important for the science community because it gives us another vantage point,” said Kelly Korreck, a heliophysicist at NASA. 



Observations from Parker Solar Probe have already revealed unexpected features like spikes and valleys in the corona’s outer boundary and pinpointed the origins of switchbacks in the solar wind.



<h2 class="wp-block-heading" id="h-broader-discoveries-in-the-solar-system">Broader discoveries in the solar system</h2>



Beyond studying the Sun, Parker Solar Probe has made important discoveries about the inner solar system. It showed that&nbsp;coronal mass ejections (CMEs) - massive eruptions from the Sun - act like giant vacuums, sweeping up dust particles as they move through space.



This process helps scientists understand how solar events influence the environment between planets.



The spacecraft also provided detailed information on&nbsp;<a href="https://www.earth.com/news/strong-solar-storm-warning-issued-as-two-cmes-will-hit-earth-tomorrow/" target="_blank" rel="noreferrer noopener">solar energetic particles</a>, which are high-energy particles ejected by the Sun. These particles play a critical role in space weather, affecting satellites, astronauts, and even communication systems on Earth.



During its flybys of Venus, Parker Solar Probe made remarkable observations. It detected natural radio emissions from Venus’s atmosphere, providing a better understanding of the planet’s atmospheric conditions.



Additionally, the probe captured the first-ever complete image of Venus’s orbital dust ring - a collection of fine particles that encircle the planet along its orbit. 



<h2 class="wp-block-heading" id="h-valuable-data-will-soon-reach-earth">Valuable data will soon reach Earth</h2>



The spacecraft’s recent <a href="https://www.earth.com/news/the-sun-has-officially-reached-its-solar-maximum-period-in-this-solar-cycle/" target="_blank" rel="noreferrer noopener">solar</a> pass produced valuable data which will soon be transmitted to Earth.



"The data that will come down from the spacecraft will be fresh information about a place that we, as humanity, have never been,” said Joe Westlake, NASA’s Heliophysics Division director.



With upcoming close approaches scheduled for March 22 and June 19, 2025, Parker Solar Probe promises to deepen our understanding of the Sun and its influence on the solar system. 



These efforts mark a significant step forward in humanity’s quest to unlock the secrets of the cosmos.



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Parker Solar Probe completes closest-ever approach to the Sun

NASA’s Parker Solar Probe has achieved an incredible feat, venturing...

We’ve come a long way from viewing robots merely as tools. Today, artificial intelligence (AI) and AI-enabled robots play increasing roles in human lives - from assisting us in mundane everyday tasks to aiding in complex scientific research.



They’re becoming our partners and social entities, blurring the boundaries between human and machine.



And this transition is not without its pitfalls. This transformation challenges existing legal and ethical frameworks, raising pressing concerns about privacy, safety, and regulation. 



A new publication,&nbsp;The Cambridge Handbook of the Law, Policy, and Regulation for Human-Robot Interaction, addresses these issues. The book provides a roadmap for navigating this rapidly evolving landscape.



<h2 class="wp-block-heading" id="h-complexities-of-human-robot-interactions">Complexities of human-robot interactions </h2>



Edited by Woodrow Barfield, Yueh-Hsuan Weng, and Ugo Pagallo, the handbook gathers insights from social sciences, computer science, and engineering. 



It stands as the first book to focus on the legal, policy, and regulatory aspects of human-robot <a href="https://www.earth.com/news/dancing-robots-the-future-of-human-robot-interactions/" target="_blank" rel="noreferrer noopener">interaction</a>.



“Humanities are crucial to AI development,” said Yueh-Hsuan Weng, an associate professor at <a href="https://www.kyushu-u.ac.jp/en/" target="_blank" rel="noreferrer noopener">Kyushu University</a> and <a href="https://www.tohoku.ac.jp/en/" target="_blank" rel="noreferrer noopener">Tohoku University</a>.



“Tech professionals can create cutting-edge systems, but without input from legal and humanities perspectives, these systems may struggle to coexist with humans. We hope this book serves as a compass for developers, ensuring AI systems better benefit our society.”



<h2 class="wp-block-heading" id="h-core-issues-of-human-robot-interaction">Core issues of human-robot interaction </h2>



The handbook’s 46 chapters are organized into four parts, each tackling a critical dimension of human-robot interaction:



<ol class="wp-block-list">
<li>Legal and ethical challenges: This section introduces foundational issues like trust in robots and anthropomorphism - where humans attribute emotions or intentions to non-human entities.</li>



<li>Societal impacts: This part explores whether AI entities should have legal personhood and the societal adjustments needed for greater human-robot integration.</li>



<li>Ethical and cultural values: Value alignment between <a href="https://www.earth.com/news/humans-can-feel-emotions-for-robots-especially-those-in-distress/" target="_blank" rel="noreferrer noopener">AI systems and human societies</a> is examined, highlighting regional and cultural differences. Topics include robots in long-term assistance and religious settings.</li>



<li>Legal evolution: The final section delves into how consumer, criminal, and constitutional laws must adapt to accommodate intelligent systems.</li>
</ol>



<h2 class="wp-block-heading" id="h-addressing-the-ai-pacing-problem">Addressing the AI pacing problem</h2>



“A major issue I addressed in the book is the AI pacing problem,” noted Professor Weng.



This concept highlights the gap between rapid AI advancements and slower legislative responses. While efforts to regulate AI are underway globally, comprehensive laws often lag behind technological progress.



Professor Weng proposes solutions like global <a href="https://www.earth.com/news/digital-deception-how-do-humans-respond-to-lying-robots/" target="_blank" rel="noreferrer noopener">AI</a> ethics standards developed by the IEEE, where he leads a working group. 



This initiative aims to modularize core issues and region-specific concerns, helping developers apply ethical guidelines effectively.



<h2 class="wp-block-heading" id="h-privacy-anthropomorphism-and-boundaries">Privacy, anthropomorphism, and boundaries</h2>



The handbook delves into key issues like anthropomorphism, robots in healthcare, and privacy protection, which are becoming increasingly relevant as robots integrate into human society. 



Anthropomorphism, where robots are designed to exhibit human-like behaviors or emotions, can enhance interaction but raises ethical concerns about trust and potential manipulation. 



In healthcare, robots play vital roles as caregivers, especially for older adults, assisting with tasks like mobility and medication reminders. 



However, these interactions can lead to emotional complexities, as individuals may perceive robotic caregivers as true companions, resulting in dependency or confusion. 



Privacy protection emerges as another critical concern, as robots collect vast amounts of personal data to deliver high-quality services. 



Without proper safeguards, this data could be misused, making robust and innovative regulatory solutions essential to address these challenges responsibly.



<h2 class="wp-block-heading" id="h-global-perspective-on-human-robot-interaction">Global perspective on human-robot interaction</h2>



The handbook brings together experts from various countries and presents case studies from across the globe, promoting a global dialogue on ethical dilemmas in human-robot <a href="https://www.earth.com/news/how-will-humans-react-to-coexisting-with-robots/" target="_blank" rel="noreferrer noopener">interaction</a>. 



“As human-AI interactions become more common, I hope designers, manufacturers, and users of robots will engage with our book. Responsible research and innovation are crucial for the development of AI and robots, and this requires input from people across various societal sectors,” said Professor Weng.



<h2 class="wp-block-heading" id="h-shaping-the-future-of-ai-and-robotics">Shaping the future of AI and robotics</h2>



The Cambridge Handbook of the Law, Policy, and Regulation for Human-Robot Interaction&nbsp;offers a comprehensive framework for understanding and addressing the complexities of AI-enabled robots. 



By sparking discussions across disciplines, it aims to guide the responsible integration of robots into society. 



“We warmly invite everyone to explore this book and join us in creating IEEE’s global standards for AI ethics,” said Professor Weng.



The <a href="https://www.cambridge.org/core/books/cambridge-handbook-of-the-law-policy-and-regulation-for-humanrobot-interaction/5740D8AEA42968E6A195BEDF5CBD0E5C" target="_blank" rel="noreferrer noopener">book</a> is now available online, providing essential insights for navigating the future of human-robot interaction.



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Human-robot interaction: Are we prepared for the ethical challenges?

We’ve come a long way from viewing robots merely as...

Plans to revisit the Moon by the end of this decade promise an exciting step for space exploration. Experts now caution that our arrival could bring unexpected hazards by creating thin, short-lived, toxic atmospheres made of moon dust right above the lunar surface.



<h2 class="wp-block-heading" id="h-human-footprints-new-frontiers">Human footprints, new frontiers</h2>



Our natural satellite has little more than an extremely sparse layer of gas around it at any given moment, which scientists call an exosphere. 



<a href="https://www.earth.com/news/nasa-plans-to-build-house-on-the-moon-by-2040/" target="_blank" rel="noreferrer noopener">In the near future</a>, astronaut activities, mining efforts, and rocket launches may change that fragile environment and kick up large amounts of <a href="https://curator.jsc.nasa.gov/lunar/letss/regolith.pdf" target="_blank" rel="noreferrer noopener">regolith</a> that jeopardize missions and equipment.



<a href="https://science.gsfc.nasa.gov/sci/bio/rosemary.killen" target="_blank" rel="noreferrer noopener">Rosemary Killen</a>, a planetary scientist at <a href="https://www.nasa.gov/centers/goddard" target="_blank" rel="noreferrer noopener">NASA’s Goddard Space Flight Center</a>, has voiced concerns about tiny dust particles swirling into the air and endangering explorers. “One thing that really worries us is that the dust raised by the explorers and so on will be loaded,” she said.



<h2 class="wp-block-heading" id="h-tiny-moon-dust-clouds">Tiny moon dust clouds</h2>



Moon dust, or regolith, has formed over billions of years from space rock impacts and solar wind effects. 



The fine grains <a href="https://www.sciencedirect.com/science/article/pii/S0273117724008615" target="_blank" rel="noreferrer noopener">pose health risks</a> when stirred up by rocket boosters and rovers, and their static-like buildup may affect visibility, respiratory health, and electronic instruments.



Exhaled vapors, leakages from spacecraft, and even little bits of water from life support systems can also add gas to the surrounding area. 



Although these additions may be short-lived, they can spread across miles before settling and freezing in the Moon’s shaded regions.



<h2 class="wp-block-heading" id="h-lunar-science-at-stake">Lunar science at stake</h2>



Researchers intend to unlock ancient secrets by analyzing pristine ice in permanently shadowed craters, where water may have existed for ages. 



But human-introduced <a href="https://baas.aas.org/pub/2024i009/release/1" target="_blank" rel="noreferrer noopener">water vapor</a> can confuse those findings, since it can freeze in the same dark spots and obscure chemical clues about the Moon’s past.



Many instruments and experiments depend on analyzing dust and gases with as little contamination as possible. 



Equipment set up to measure local atmospheric makeup might be thrown off by unwanted clouds of exhaust or recycling byproducts.



<h2 class="wp-block-heading" id="h-spaceships-and-moon-dust-blasts">Spaceships and moon dust blasts</h2>



NASA has partnered with commercial groups to ferry astronauts and cargo to the Moon in an effort often referred to collectively as the Artemis missions (<a href="https://www.nasa.gov/specials/artemis/" target="_blank" rel="noreferrer noopener">NASA Artemis</a>). Large vehicles, including Starship variants, might cause forceful landings that fling moon dust up at high altitudes and create brief “atmospheric” pockets of gas and tiny particles.



<a href="https://www.earth.com/news/how-nasa-plans-to-keep-people-in-space-after-the-iss-is-gone/">Space agencies</a> say they will try to minimize these effects by choosing suitable landing sites and carefully planning flight paths. 



Yet observers warn that a few seconds of rocket thrust could hurl moon dust long distances and deposit fresh contaminants in remote locations.



<h2 class="wp-block-heading" id="h-why-moon-dust-causes-concern">Why moon dust causes concern</h2>



Moon dust is not just an irritant: it can damage lungs, scratch surfaces on suits, and clog machinery. 



Some analysts compare it to the harm that soot or coal dust causes to miners if inhaled over time, which might reduce the safety margin for extended <a href="https://www.earth.com/news/nasa-new-lunar-fss-mission-will-explore-moon-far-side-moonquakes/">Moon missions</a>.



Astronauts also risk tracking moon dust back inside their living quarters. Dirty suits, tools, and rovers can transport the debris into airlocks and the interiors of space craft, which raises concerns about health impacts and mechanical damage.



<h2 class="wp-block-heading" id="h-protecting-scientific-treasures">Protecting scientific treasures</h2>



High-priority research targets include regions that have barely changed in billions of years. Certain <a href="https://www.sciencedirect.com/science/article/abs/pii/S0019103517307340?via%3Dihub" target="_blank" rel="noreferrer noopener">shadowy craters</a> may hold ice that could reveal how water arrived on Earth and the Moon, and offer clues about our planet’s beginnings.



Adding even a small amount of new water or gas can make existing data hard to interpret. Some scientists recommend carefully planned operations and restricted zones to preserve these ancient substances until samples can be taken under controlled conditions.



<h2 class="wp-block-heading" id="h-balancing-exploration-with-caution">Balancing exploration with caution</h2>



No one wants to halt progress in <a href="https://www.earth.com/news/space-travel-has-unexpected-effects-on-gut-health/">space travel</a>. But specialists suggest that mindful mission designs, gentle landing technologies, and well-managed mining or drilling are necessary to keep the lunar surface intact.



<a href="https://www.nasa.gov" target="_blank" rel="noreferrer noopener">NASA</a> aims to collect enough data to separate what is truly native to the Moon from anything brought by humans. 



Such efforts will help us learn the limits of lunar resources, the dangers of moon dust, and the best ways to safeguard explorers.



<h2 class="wp-block-heading" id="h-moon-dust-and-lunar-exploration">Moon dust and lunar exploration</h2>



Our <a href="https://www.earth.com/news/lunar-glass-may-rewrite-the-geological-history-of-the-moon/">renewed presence on the Moon</a> introduces a host of fascinating possibilities. Yet it also places the spotlight on how fragile the lunar environment can be, reminding us that every footprint, launch, or sample has an impact.



From potential dust hazards to artificial atmospheric bursts, new lunar developments call for cooperation among space agencies, scientists, and private companies.&nbsp;



If handled wisely, tomorrow’s Moon missions will open a window to incredible discoveries while preserving our cosmic neighbor for future generations.



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NASA alert: Humans risk creating a toxic atmosphere on the Moon

Plans to revisit the Moon by the end of this...

Picture the majestic Angel Falls or the thundering Niagara Falls -- waterfalls so powerful they draw millions of admirers each year.



Yet, there exists another overflow so vast and awe-inspiring that it renders these iconic cascades almost insignificant by comparison. 



This hidden titan is not a waterfall that plunges down a mountainside or roars over a cliff edge.



Instead, it plunges slowly and invisibly, deep beneath the icy waters of the Arctic, claiming the prestigious title of Earth's largest waterfall.



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



Most waterfalls are found on land and form when a river or stream flows over a sudden drop in the landscape. Essentially, the water takes a dive off a cliff or steep ledge, creating that classic cascading effect. 



Over time, the constant rush of water erodes the rock beneath, which can cause the drop to become even steeper. 



In some places, softer rock wears away faster than harder rock, which is why waterfalls can develop interesting shapes or even recede upstream.



Besides looking spectacular, waterfalls also impact their surroundings in noticeable ways. The turbulent water at the base can carve out deep pools, and the constant spray fosters lush plant growth around the area. 



Many waterfalls also support unique ecosystems because of the cooler temperatures and higher humidity near their misty spray. 



Then, you have underwater waterfalls. Although they’re not quite the same as the roaring, above-ground versions you see all around the world, they are equally spectacular in their own way.



<h2 class="wp-block-heading" id="h-the-marvel-of-the-largest-waterfall">The marvel of the largest waterfall</h2>



Somewhere between Iceland and Greenland, concealed beneath the chilly <a href="https://www.earth.com/news/atlantic-and-arctic-mixing-is-crucial-for-earths-climate-stability/" target="_blank" rel="noreferrer noopener">Arctic waters</a>, the Denmark Strait cataract lies submerged.



Standing tall with a vertical drop of an astonishing 11,500 feet (3,500 meters), it's over three times the height of the tallest land waterfall -- the Angel Falls in Venezuela.



With an extraordinary width of around 300 miles (480 kilometers), this unseen giant is a critical player in our planet's ocean circulation.



This gigantic waterfall only exists due to the convergence of icy water from the Nordic Seas and warmer water from the Atlantic Ocean. 



Here, the stark contrast in temperature and salinity (saltiness) fuels a cascade powerful enough to move colossal volumes of water across the ocean floor.



<h2 class="wp-block-heading" id="h-hidden-from-human-sight">Hidden from human sight</h2>



And yet, despite this massive scale, the waterfall stays hidden from human sight, and is only detectable using advanced oceanographic tools.



"If you were down there, you probably wouldn't notice a whole heap going on," said Mike Clare, who leads marine geosystems at the <a href="https://noc.ac.uk/" target="_blank" rel="noreferrer noopener">UK's National Oceanography Centre</a>.



However, beneath the calm surface, powerful natural processes are at work, driving global ocean currents and regulating the planet's climate.



<h2 class="wp-block-heading" id="h-creation-of-the-largest-waterfall">Creation of the largest waterfall</h2>



The Denmark Strait cataract didn't just appear out of nowhere. It's an ancient relic, formed between 17,500 and 11,500 years ago during the <a href="https://www.earth.com/news/disastrous-climate-changes-of-the-last-ice-age-could-happen-again/" target="_blank" rel="noreferrer noopener">last Ice Age</a>.



As immense glaciers reshaped the landscape, the unique structure of this immense waterfall was sculpted.



Unlike its land-based counterparts, this hidden marvel exists in a dynamic environment, shaped and preserved by a thousand-year-old combination of shifting <a href="https://www.earth.com/news/atlantic-ocean-currents-slowing-as-water-temperature-rises/" target="_blank" rel="noreferrer noopener">ocean currents</a>, temperature fluctuations, and geological processes.



<h2 class="wp-block-heading" id="h-global-water-movement">Global water movement </h2>



This awe-inspiring underwater waterfall does more than just defy our sense of size and power. It has a critical role in regulating some of the Earth's most crucial processes.



As part of a global system, the Denmark Strait cataract helps distribute heat, nutrients, and energy across the globe.



The colossal cascade is a key driver of the <a href="https://www.earth.com/news/atlantic-current-system-may-collapse-by-2037/" target="_blank" rel="noreferrer noopener">ocean's conveyor belt</a>, which is a crucial part of the thermohaline circulation. This global water movement pattern significantly impacts weather, sea levels, and the livelihood of marine ecosystems.



"What happens here is felt everywhere. The flow creates a ripple effect that connects ecosystems and climates around the globe," explained marine scientist Anna Sanchez Vidal, 



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



Compared to popular land-based attractions like Niagara Falls and Angel Falls, the Denmark Strait cataract surpasses them in size. 



Around 3.2 million cubic meters of water flow over the cataract each second, which is far more than the Amazon River discharges into the Atlantic Ocean. Yet, its flow doesn't roar or bubble with the same visual spectacle.



Despite its serene demeanor and invisibility to the naked eye, its influence reaches far beyond its location, proving that nature's power often operates in the most subtle ways. 



<h2 class="wp-block-heading" id="h-the-extraordinary-denmark-strait-cataract">The extraordinary Denmark Strait cataract </h2>



The Denmark Strait cataract stands alone in its scale and significance, but it also represents a broader category of rare natural phenomena: submarine waterfalls.



These underwater cascades are distinct from the more familiar terrestrial waterfalls, as they rely on oceanographic conditions such as differences in temperature, <a href="https://www.earth.com/news/human-induced-changes-in-ocean-salinity-threaten-biodiversity-and-marine-ecosystems/" target="_blank" rel="noreferrer noopener">salinity</a>, and water density.



What makes the Denmark Strait cataract truly extraordinary is the stark contrast between the icy Nordic Seas and the warmer Atlantic waters. These conditions create a gravity-driven flow that surpasses any similar processes found in the deep ocean.



While smaller density flows occur in other regions, such as near ocean ridges or in certain straits, none match the width or vertical drop of the Denmark Strait overflow.



It’s a reminder that even in the largely unexplored depths of the ocean, natural wonders abound, and shape the world in unseen ways.



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Earth’s largest waterfall is hidden in the ocean

Picture the majestic Angel Falls or the thundering Niagara Falls...

What if a selfie could tell you something more than just how your hair looks today? What if selfies could reveal your biological age, regardless of the number of candles on your last birthday cake? 



The "face age" test from selfies is a type of AI-powered analysis that estimates a person's age based on facial features in a photo, and it's making waves in the medical community.



<h2 class="wp-block-heading" id="h-selfies-reveal-your-body-s-true-age">Selfies reveal your body's true age</h2>



"Face age" is more than a novel idea - it’s becoming a tool for making critical <a href="https://www.earth.com/news/the-future-of-ai-enhancing-patient-safety/" target="_blank" rel="noreferrer noopener">medical decisions</a>. In some cases, it has influenced cancer treatment plans and even predicted patient survival rates.



Dr. Raymond Mak, a radiation oncologist at <a href="https://www.brighamandwomens.org" target="_blank" rel="noreferrer noopener">Brigham and Women’s Hospital</a> in Boston, Massachusetts, recently demonstrated the power of this technology.



Dr. Mak treated Lou Magelaner, a 90-year-old lung cancer patient, who appeared much younger than his age. Relying on his intuition and the <a href="https://www.earth.com/news/ai-is-the-next-frontier-in-cancer-treatment/" target="_blank" rel="noreferrer noopener">AI-driven tool</a> FaceAge, Dr. Mak confirmed his assessment.



When he uploaded Magelaner’s photo, the tool estimated his biological age to be 66. This result reinforced Dr. Mak's confidence in pursuing a treatment plan designed for younger patients.



"My gut was like, he’s more like a 70-year-old,” said Dr. Mak. After several weeks of radiation therapy, the treatment proved successful.



<h2 class="wp-block-heading" id="h-how-the-faceage-tool-works">How the FaceAge tool works</h2>



The FaceAge tool analyzes facial features using an AI model trained on thousands of images. By detecting subtle signs of aging, it offers insights into a person's health. 



Preliminary research suggests cancer patients often look biologically older than their actual age. This "older appearance" might correlate with earlier mortality, helping doctors refine <a href="https://www.earth.com/news/how-ai-could-protect-millions-of-people-from-vision-loss/" target="_blank" rel="noreferrer noopener">treatment decisions</a>.



FaceAge isn't alone in this space. Consumer versions of such tools are already available online. For instance, Novos, a company focused on longevity, provides a free test that examines wrinkles, eye condition, and other facial features to estimate biological age. 



Over 300,000 people have tried it, including Novos CEO Chris Mirabile, who uses it as a motivation for healthier living.



<h2 class="wp-block-heading" id="h-ai-s-growing-role-in-healthcare">AI's growing role in healthcare</h2>



Artificial intelligence is being steadily integrated into healthcare. Beyond FaceAge, AI tools are detecting conditions like Parkinson’s disease from facial scans and identifying Covid-19 on X-rays.



“These digital tools aim to enhance clinical intuition,” noted Dr. Mak. In his study, FaceAge even outperformed doctors in predicting cancer patient survival rates.



Such advancements could guide treatment decisions or alert patients to seek medical attention. However, these tools remain primarily in research stages.



<h2 class="wp-block-heading" id="h-challenges-and-ethical-concerns">Challenges and ethical concerns</h2>



Despite its promise, face-age technology isn’t perfect. Training datasets often rely on images of wealthy individuals or celebrities, leading to potential biases. 



As a result, the technology may struggle to provide accurate results for underrepresented racial groups. Factors like poor lighting, low image quality, and cosmetic procedures can also skew predictions.



Additionally, ethical concerns surround its use in clinical settings. Patients identified as biologically "older" may face unconscious biases from doctors, potentially impacting their care.



Nicole Martinez-Martin, a bioethics expert at <a href="https://www.stanford.edu" target="_blank" rel="noreferrer noopener">Stanford University</a>, warns about these risks. "Patients flagged by these tools might receive less attention," she noted, which could lead to unequal treatment outcomes.



<h2 class="wp-block-heading" id="h-future-of-face-age-testing">Future of face age testing</h2>



While the technology is still evolving, the potential of tools like FaceAge is undeniable. Ultimately, these tools could play a crucial role in precision medicine, allowing doctors to make better-informed decisions for individual patients.



Further studies aim to refine the algorithms, ensuring more inclusive and accurate predictions. Researchers like Jing-Dong Jackie Han at <a href="https://english.pku.edu.cn" target="_blank" rel="noreferrer noopener">Peking University</a> are exploring how specific facial changes, such as drooping eyes or shrinking foreheads, correlate with age and health. 



Some studies even suggest that youthful-looking individuals might have younger blood, linking biological age to overall health.



<h2 class="wp-block-heading" id="h-a-tool-for-healthier-living">A tool for healthier living?</h2>



Consumer-friendly tools like those from Novos show how face-age technology could extend beyond clinics. 



By highlighting areas of improvement, these tools could encourage individuals to adopt healthier lifestyles. Mirabile believes this feedback can act as a wake-up call for users. "It’s a great way to measure and motivate change," he said.



As AI continues to evolve, tools like FaceAge may redefine healthcare. They could offer insights into aging, help combat diseases, and support healthier living. 



While challenges remain, the promise of "face age" lies in its ability to merge cutting-edge technology with personal and clinical applications. With further refinement, it might soon become a vital tool in both medicine and everyday life.



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Selfies reveal your 'face age' and subtle signs about your health

What if a selfie could tell you something more than...

Droughts pose an increasing challenge for humans, animals, and plants, particularly in arid regions. Many species have remarkable abilities to adapt to these harsh conditions, but a recent study sheds lights on how a rising number of prolonged droughts may impact wildlife. 



Extended periods of drought are projected to become an alarming reality for a wide range of animal species across the United States in the coming decades, and their ability to adapt will be key to their survival.



<h2 class="wp-block-heading" id="h-a-future-with-frequent-droughts">A future with frequent droughts</h2>



According to the research, many wildlife species in the U.S. will have to endure year-long droughts almost five times as often between 2050 and 2080 compared to the period between 1950 and 2005.



Furthermore, three-year-long droughts could become nearly seven times more frequent. These drastic changes will require serious <a href="https://www.earth.com/news/some-species-are-pre-adapted-to-tolerate-climate-change/" target="_blank" rel="noreferrer noopener">adaptations</a> for wildlife to survive.



"The degree of <a href="https://www.earth.com/news/flash-droughts-are-increasing-around-the-world-due-to-warming-climate/" target="_blank" rel="noreferrer noopener">increased drought</a> exposure for each species in our analysis strongly depends on future greenhouse gas concentrations," noted study lead author Dr. Merijn van den Bosch.



"But even under a lower-concentration scenario, virtually all <a href="https://www.earth.com/news/land-vertebrates-are-vanishing-at-an-unprecedented-rate/" target="_blank" rel="noreferrer noopener">vertebrates</a> face increased year-long and multi-year droughts in the second half of this century."



<h2 class="wp-block-heading" id="h-consequences-of-persistent-droughts">Consequences of persistent droughts</h2>



Understanding the consequences of persistent droughts is challenging and depends on the specific species and the length of the drought.



For instance, the endangered giant kangaroo rat - which is native to arid regions of California - is acclimatized to occasional short droughts.



However, the population can become severely depleted following multi-year droughts, which intensify existing threats to giant kangaroo rats.



<h2 class="wp-block-heading" id="h-high-biodiversity-areas-at-risk">High-biodiversity areas at risk</h2>



The intent of this study was to pinpoint areas that have both high biodiversity and steep predicted increases in drought.



The objective was to provide data about regions where adaptive water management or habitat restoration might benefit the largest number of <a href="https://www.earth.com/news/world-wildlife-conservation-day-2024-saving-species-from-extinction/" target="_blank" rel="noreferrer noopener">wildlife species</a>.



The researchers used advanced modeling techniques to envision future scenarios based on six different projections of temperature and moisture conditions.



An in-depth comparison was carried out between the frequency of observed and projected drought exposure and the range maps of over 1,200 different species.



After adjusting for land area, the results revealed that the southwestern United States had the greatest number of species. This region also had the highest number of drought-threatened species and the highest predicted change in drought exposure.



<h2 class="wp-block-heading" id="h-wildlife-facing-increasing-droughts">Wildlife facing increasing droughts</h2>



Dr. Zack Steel, senior author of the study, expressed concerns about the increasing drought and its effects on wildlife.



"Some of the areas expected to see the greatest increase in drought, such as the southwestern U.S., are already quite dry," said Dr. Steel, noting that many species living in these regions are already adapted to periodic droughts.



"But the concern is that if they are already near the limit of what they can tolerate, the large increase in drought we're expecting can have grave consequences for these ecosystems and the wildlife that depend on them."



Dr. van den Bosch and Dr. Steel are associated with <a href="https://www.colostate.edu/" target="_blank" rel="noreferrer noopener">Colorado State University</a> and the Rocky Mountain Research Station, where they are responsible for creating a fertile ground for innovative and essential studies.



<h2 class="wp-block-heading" id="h-mitigating-the-impact-of-drought-on-wildlife">Mitigating the impact of drought on wildlife</h2>



As droughts become more frequent and severe, proactive measures are urgently needed to support wildlife resilience.



Conservationists emphasize the importance of habitat restoration, such as enhancing wetland ecosystems and preserving water sources in arid regions. These efforts can provide critical refuges for species struggling with limited water availability.



Additionally, innovative water management strategies, like implementing drought-resistant vegetation and creating artificial water holes, may help sustain vulnerable populations. 



By prioritizing these interventions in high-biodiversity areas, such as the southwestern United States, researchers hope to mitigate the most devastating effects of prolonged droughts on ecosystems.



Collaborative efforts between government agencies, local communities, and scientists will be crucial to address the challenges posed by increasing drought exposure, and to ensure that both wildlife and their habitats have a fighting chance to adapt and thrive in a rapidly <a href="https://www.earth.com/news/climate-change-is-now-the-driving-force-behind-droughts/" target="_blank" rel="noreferrer noopener">changing climate</a>.



The full study was published in the journal <a href="https://www.nature.com/articles/s43247-024-01880-z" target="_blank" rel="noreferrer noopener">Communications Earth &amp; Environment</a>.



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How persistent droughts will impact wildlife in the U.S.

Droughts pose an increasing challenge for humans, animals, and plants,...

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



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



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



Video/ Image Credit: ESA



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

Nushagak Bay in southwest Alaska

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



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



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



Video/ Image Credit: American Chemical Society&nbsp;



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



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Flu viruses are more flexible than expected

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

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



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



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



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



Video/Image Credit: ESA&nbsp;



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

Lake Trasimeno in Central Italy

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



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



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



Video Credit: American Chemical Society&nbsp;



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



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

Detecting mercury contamination with the tap of a finger

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



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



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



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



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



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



Video/ Image Credit: European Space Agency&nbsp;



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



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

Kainji Lake in north central Nigeria

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



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



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



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



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



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



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



Video Credit: Amanda Nguyen/University of Illinois



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



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

Designing crops that can beat the heat

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