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

Antibiotic-resistant bacteria are becoming a severe threat to global health, with potentially catastrophic consequences. 



New research led by Northern Arizona University (NAU) reveals that infection-related deaths could surge due to multidrug-resistant and pan-resistant bacteria. This isn’t a question of if, but when, warns the study’s lead author, Benjamin Koch.



Published in&nbsp;the journal Communications Medicine, the study highlights the growing danger of antibiotic resistance. As antibiotic usage increases worldwide, bacteria are evolving to resist multiple antibiotics, leading to multidrug-resistance.



What's even more troubling is that pan-resistant bacteria could emerge, marking a turning point in global health. Pan-resistant bacteria are immune to all known antibiotics. 



“Multidrug-resistance is bad, but once a pathogen gains resistance to all known antibiotics, known as pan-resistance, a dramatically rapid shift, rather than a gradual rise in public health impacts, can be expected,” said Koch, a senior research scientist at <a href="https://nau.edu" target="_blank" rel="noreferrer noopener">NAU</a>’s Center for Ecosystem Science and Society (Ecoss).



<h2 class="wp-block-heading" id="h-what-is-antibiotic-resistance">What is antibiotic resistance?</h2>



Antibiotic resistance is when <a href="https://www.earth.com/news/soil-plays-an-overlooked-role-in-antibiotic-resistance/" target="_blank" rel="noreferrer noopener">bacteria evolve</a> to survive treatments meant to kill them. Antibiotics are medicines used to treat bacterial infections. Over time, certain bacteria adapt and develop defenses against these drugs.



This resistance often arises from improper or excessive use of antibiotics. For example, taking antibiotics for viral infections, not completing prescribed doses, or overusing them in farming can all contribute. 



When bacteria become resistant, they continue to grow and spread despite antibiotic treatment, making infections harder or even impossible to cure.



This problem isn’t limited to just one country or region. Resistant bacteria can spread globally, threatening public health and making previously treatable illnesses - like pneumonia or urinary tract infections - more dangerous.



To address this, we need better antibiotic use, policies, and the development of new medicines.



<h2 class="wp-block-heading" id="h-what-happens-when-pan-resistance-strikes">What happens when pan-resistance strikes</h2>



Using hypothetical models, researchers studied the potential impact of a pan-resistant strain of E. coli on sepsis deaths in the United States. By analyzing long-term data on sepsis incidence, mortality rates, and <a href="https://www.earth.com/news/antimicrobial-resistance-could-cause-39-million-deaths-by-2050/" target="_blank" rel="noreferrer noopener">treatment outcomes</a>, they found shocking results.



Their models predict that sepsis deaths could increase by 18 to 46 times within just five years after the introduction of a pan-resistant strain. This hypothetical strain doesn’t exist yet, but the rapid evolution of bacteria suggests it may be inevitable.



“With the available data, researchers aren’t able to predict the timing of pan-resistance with any accuracy; it could be in a year, or it could be in a century,” Koch noted.



<h2 class="wp-block-heading" id="h-global-health-equalizer">Global health equalizer</h2>



Antibiotic resistance doesn’t discriminate. Unlike other health crises that disproportionately affect lower-income populations, pan-resistance would erase advantages like access to superior health care or varied <a href="https://www.earth.com/news/scientists-create-viruses-to-combat-antibiotic-resistant-bacteria/" target="_blank" rel="noreferrer noopener">antibiotic options</a>.



People in both high-income and low-income countries would face the same grim outcomes from infections that were once easily treatable.



<h2 class="wp-block-heading" id="h-what-can-be-done-about-antibiotic-resistance">What can be done about antibiotic resistance?</h2>



The researchers emphasize that while the threat is grave, steps can be taken to reduce the risk. Governments, industries, and individuals have crucial roles to play.



Governments must enforce stricter policies around the use of <a href="https://www.earth.com/news/antibiotic-resistance-increasing-enterococci-looming-global-crisis/" target="_blank" rel="noreferrer noopener">antibiotics</a> in both human and veterinary medicine. They must also incentivize the development of new antibiotics - an area of research that has slowed in recent years.



“There are technologies that could monitor the emergence and spread of antibiotic resistance,” said Koch. Investments in these innovations could provide early warnings and help contain outbreaks.



<h2 class="wp-block-heading" id="h-responsible-antibiotic-use">Responsible antibiotic use</h2>



On an individual level, the proper use of <a href="https://www.earth.com/news/climate-change-increases-threat-antimicrobial-resistance/" target="_blank" rel="noreferrer noopener">antibiotics</a> is critical. Koch advises using antibiotics only when prescribed by a health care provider and avoiding unnecessary usage. 



Supporting policies that promote antibiotic stewardship can help curb the spread of resistance.



<h2 class="wp-block-heading" id="h-need-for-urgent-action">Need for urgent action</h2>



The rise of pan-resistant bacteria could redefine global public health challenges. 



“We must reduce the forces that currently promote the evolution and dissemination of <a href="https://www.earth.com/news/bacteria-in-livestock-are-major-drivers-of-antibiotic-resistance/" target="_blank" rel="noreferrer noopener">antibiotic</a>-resistant pathogens. Globally, this means improving antibiotic stewardship in human and veterinary medicine and in food-animal production,” Koch concluded.



The findings highlight the urgency of tackling antibiotic resistance before it spirals out of control. With coordinated action, the global community can slow the rise of antibiotic-resistant bacteria and potentially save millions of lives.



The study is published in the journal <a href="https://www.nature.com/articles/s43856-024-00693-7" target="_blank" rel="noreferrer noopener">Communications Medicine</a>.



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Antibiotic resistance could cause a global health crisis

Antibiotic-resistant bacteria are becoming a severe threat to global health,...

Peeling back the layers of history, we find ourselves in the heart of the ancient copper industry in the time of King Solomon’s mines.



The tale of this legendary biblical king and his mines has been passed down through generations, with many people assuming that the mining process of ancient copper production left rampant pollution and environmental destruction.



But what if that ominous narrative isn't as factual as we’ve been led to believe?



<h2 class="wp-block-heading" id="h-new-perspective-on-copper-production">New perspective on copper production </h2>



Researchers from Tel Aviv University (TAU) have recently challenged this story. Their study delivers a new perspective on the industrial history of these legendary mines.



Their findings not only rewrite the story of ancient copper smelting but also invite a reexamination of how we interpret environmental impacts in historical contexts.



The research, published in the journal Nature Scientific Reports, reveals that the environmental pollution generated by ancient copper production was far less severe than previously thought.



<h2 class="wp-block-heading" id="h-surveys-at-copper-production-sites">Surveys at copper production sites</h2>



The study was led by Professor Erez Ben-Yosef, Dr. Omri Yagel, Willy Ondricek, and Dr. Aaron Greener from the Chaim Rosenberg School of Jewish Studies and Archaeology at <a href="https://english.tau.ac.il/" target="_blank" rel="noreferrer noopener">Tel Aviv University</a>.



To investigate, the team conducted comprehensive geochemical surveys at copper production sites in the Timna Valley near Eilat, Israel.



The sites dated back to the 10th century BCE - an era that echoes with the names of the biblical Kings David and Solomon.



"We inspected two major copper production sites in the Timna Valley, one from the <a href="https://www.earth.com/news/hazelnut-shells-offer-clues-ancient-landscapes/" target="_blank" rel="noreferrer noopener">Iron Age</a> and King Solomon’s era and another nearby that is about 1,500 years older,” said Professor Ben-Yosef.



“Our study was very extensive. We took hundreds of soil samples from both sites for chemical analyses, creating high-resolution maps of heavy <a href="https://www.earth.com/news/iron-was-lifes-first-essential-metal-and-shaped-early-evolution/" target="_blank" rel="noreferrer noopener">metal</a> presence in the region,” he explained.



<h2 class="wp-block-heading" id="h-extremely-low-pollution-levels">Extremely low pollution levels</h2>



The results of the study were rather surprising. According to Professor Ben-Yosef, the team found that pollution levels at the Timna copper mining sites are extremely low and confined to the locations of the ancient smelting furnaces.



 “For instance, the concentration of <a href="https://www.earth.com/news/151-million-americans-have-mental-health-disorders-linked-to-leaded-gasoline/" target="_blank" rel="noreferrer noopener">lead</a> - the primary pollutant in metal industries - drops to less than 200 parts per million just a few meters from the furnace," said Professor Ben-Yosef.



"By comparison, the U.S. Environmental Protection Agency defines industrial areas as safe for workers at 1,200 parts per million and residential areas as safe for children at 200 parts per million.”



The experts noted that this finding directly contradicts a series of papers published since the 1990s alleging pollution caused by the ancient copper industry.



"We demonstrate that this is not true. Pollution in Timna is very restricted spatially, and it’s likely that only those working directly at the furnace suffered from inhaling toxic fumes, while just a short distance away, the soil is entirely safe," said the researchers.



<h2 class="wp-block-heading" id="h-debunking-old-theories">Debunking old theories </h2>



Seeking to understand the bigger picture, the TAU archaeologists also conducted a comprehensive review of existing literature on ancient industrial <a href="https://www.earth.com/news/one-in-six-deaths-in-2019-was-caused-by-pollution/" target="_blank" rel="noreferrer noopener">pollution</a>.



Their review unveiled a recurring assumption: traces of ancient metallurgical activity were labeled as "pollution." 



As a result, the inference was drawn that metal industries, from their earliest beginnings, were <a href="https://www.earth.com/news/car-tires-shed-pollutants-that-are-especially-toxic-for-humans-and-wildlife/" target="_blank" rel="noreferrer noopener">harmful to humans</a>. This standpoint, the researchers argue, is far from the truth.



"Even when metal production was large-scale, becoming integral to human civilization, it was the toxic lead industry that caused global pollution, not necessarily other metals," the team noted.



<h2 class="wp-block-heading" id="h-projecting-our-pollution-problems">Projecting our pollution problems </h2>



The experts emphasized that in dealing with the severe environmental challenges of our time, we must be cautious not to project modern pollution problems onto the past.



“While we might label a few pieces of slag on the ground as 'pollution,' we should not confuse this localized waste with regional or global environmental pollution,” they cautioned.



Taking us on a journey through time, the researchers at TAU help us see the past in a new light - one that challenges our preconceived notions about an ancient copper industry. 



The findings provide a crucial reminder that we need to view the past without the lens of our current environmental anxieties.



The full study was published in the journal <a href="https://www.nature.com/articles/s41598-024-80939-5" target="_blank" rel="noreferrer noopener">Scientific Reports</a>.



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Copper industry of King Solomon’s era didn't harm the environment

Peeling back the layers of history, we find ourselves in...

The COVID-19 pandemic drastically altered the world. Masks, lockdowns, travel bans, and public health mandates became the norm in 2020, as virus cases surged.



The World Health Organization estimates that over three million lives were lost to the virus in its first year alone, marking a profound impact on health systems and economies worldwide.



Now, half a decade later, researchers continue to explore how we can better prepare for future respiratory diseases. A study from the University of Surrey, led by Dr. Richard Sear, sheds light on the effectiveness of combined public health measures in mitigating airborne viral transmission.



These findings offer valuable insights for managing not just future pandemics but also seasonal illnesses like flu and respiratory syncytial virus (RSV).



<h2 class="wp-block-heading" id="h-understanding-viral-transmission">Understanding viral transmission</h2>



Dr. Sear, an associate professor at Surrey’s School of Mathematics and Physics, examined how COVID-19 spreads through airborne transmission.



His work combined data modeling with information from the UK’s NHS COVID-19 app to evaluate the effectiveness of strategies like mask-wearing and improved ventilation.



“I’ve tried to measure how effective strategies, such as mask-wearing, are for the transmission of airborne viruses. This is both for any future pandemic, and for seasonal flu,“ said Dr. Sear.



“I combined modeling with data from the UK’s NHS COVID-19 app. While these estimates are highly approximate, they provide guidance on the value of measures such as face masks, social distancing and improved indoor air quality, which could be tested in the future.”



<h2 class="wp-block-heading" id="h-high-quality-face-masks">High quality face masks</h2>



Among the protective measures studied, high-quality face masks stood out as particularly effective. Masks like N95/FFP2 reduced the <a href="https://www.earth.com/news/virus-lifespan-and-transmission-boosted-by-high-co2-levels/" target="_blank" rel="noreferrer noopener">COVID-19 transmission</a> rate by approximately ninefold when worn universally. 



Even when used individually, these masks cut transmission risk by threefold, regardless of the contact duration. However, surgical and cloth masks were found to be much less effective by comparison.



The study highlights the importance of prioritizing high-quality masks in future public health strategies, not just for pandemics but also for managing seasonal respiratory illnesses.



<h2 class="wp-block-heading" id="h-improving-indoor-ventilation-a-key-strategy">Improving indoor ventilation: A key strategy</h2>



Beyond high-quality masks, ventilation plays a crucial role in reducing virus <a href="https://www.earth.com/news/viruses-use-gps-to-move-precisely-within-insects/" target="_blank" rel="noreferrer noopener">transmission</a>. Viral particles tend to accumulate in poorly ventilated spaces, especially during close-contact interactions, speaking, or coughing. 



Dr. Sear’s study found that doubling indoor air turnover rates - whether through open windows, increased airflow from air conditioning systems, or improved mechanical ventilation - can lower transmission risk by as much as 30%.



Coupling better ventilation with physical distancing further enhances protection, creating a multi-layered approach to airborne transmission prevention.



<h2 class="wp-block-heading" id="h-environmental-and-behavioral-factors">Environmental and behavioral factors</h2>



The variability in COVID-19 transmission rates can be influenced by multiple factors, including viral load, individual susceptibility, and environmental conditions. 



Some contacts pose a significantly higher risk than others, emphasizing the need for public health strategies that address both environmental and behavioral aspects.



“The COVID-19 <a href="https://www.earth.com/news/how-the-covid-19-virus-travels-deep-inside-our-lungs/" target="_blank" rel="noreferrer noopener">pandemic</a> was terrible for many of us, which is why it’s important that we learn from our experiences. It also demonstrated how quickly we can develop and roll out vaccines when faced with a global health crisis,“ noted Dr. Sear.



“Moving forward, both we as individuals and our leaders have an opportunity to apply these lessons to better control respiratory diseases - not only to head off any future pandemics, but to also manage seasonal diseases such as flu and RSV.”



<h2 class="wp-block-heading" id="h-strategies-to-reduce-viral-transmission">Strategies to reduce viral transmission </h2>



The lessons from the COVID-19 pandemic highlight the value of preventive measures in controlling airborne diseases. 



Investing in high-quality masks, improving indoor air quality, and promoting behavioral changes like distancing and masking during outbreaks can significantly reduce viral transmission risks. These strategies will not only help in preventing future pandemics but also improve management of seasonal respiratory illnesses.



By understanding and applying these findings, society can better protect itself from the health and economic impacts of airborne <a href="https://www.earth.com/news/covid-infection-equips-the-body-to-fight-off-the-flu/" target="_blank" rel="noreferrer noopener">diseases</a>. 



As Dr. Sear’s study demonstrates, simple yet effective measures like wearing N95 masks and enhancing ventilation can make a substantial difference in reducing virus transmission and saving lives.



The study is published in the journal <a href="https://journals.aps.org/pre/abstract/10.1103/PhysRevE.110.064302" target="_blank" rel="noreferrer noopener">Physical Review E</a>.



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Preparing for the next pandemic: Lessons about viral transmission

The COVID-19 pandemic drastically altered the world. Masks, lockdowns, travel...

<div id="58e3ebce955a315103d39bd1" class="vdb_player vdb_58e3ebce955a315103d39bd158d96b98cd4fed198a0d2a49" data-placeholder="//img.vidible.tv/prod/2018-04/15/5ad38c2dc269d626d05572d0/5ad38c74a4b22e70bc6e485c_o_A_v2.jpg?w=1440&amp;h=900&amp;q=60">
<script src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" type="text/javascript"></script></div>
 
The uneven distribution of California stream restoration Today’s Video of the Day comes from the <a href="https://www.ucsc.edu/">University of California, Santa Cruz</a> and a features a look at how stream restoration projects are unevenly distributed along the <a href="https://www.earth.com/news/fertilized-soil-pollution-california/">central California</a> coast.
According to a new study, stream restoration tends to be clustered in areas with particular ecological need, either with an abundance of fish or damaged habitats. 
However, the study also found that restoration also tends to take place in areas where human communities are whiter, wealthier, and more educated. The uneven distribution of California stream restoration as shown above in video shows the Analysis methods and tools, and planning and design guidance for specific restoration features are also provided. This technical note is a bibliographic repository of information available to assist professionals with the process of planning, analyzing, and designing stream restoration projects.
The land area draining to a stream or river is called its watershed. When rain falls in a watershed, it runs off the land surface, infiltrates the soil or evaporates. As surface runoff moves downslope, it concentrates in low areas and forms small stream channels.
&#8212;
By <a href="mailto:rarnold@earth.com">Rory Arnold</a>, <a href="https://www.earth.com/staff">Earth.com</a> Staff Writer
Video Credit: <a href="https://www.ucsc.edu/">University of California, Santa Cruz</a>, Nick Gonzales