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...

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

Community dog parks are often seen as cheerful places where dogs can run free and interact with other pets. Many people feel that these shared spaces help animals stay active, but new <a href="https://parasitesandvectors.biomedcentral.com/articles/10.1186/s13071-024-06563-4" target="_blank" rel="noreferrer noopener">research</a> points to a different story.



Recent <a href="https://parasitesandvectors.biomedcentral.com/articles/10.1186/s13071-024-06563-4" target="_blank" rel="noreferrer noopener">findings</a> from the Department of Ecosystem and Public Health at the University of Calgary have revealed that half of the fecal samples collected in select dog parks contained intestinal parasites. These particular parasites have the potential to affect not only canines but also humans.



<h2 class="wp-block-heading" id="h-parasites-in-dog-parks">Parasites in dog parks</h2>



 The experts found that parasites are often more common in areas where several dogs gather and roam freely. 



Parasites in the dog park samples included protozoa that are known to cause gastrointestinal issues, especially in younger or immune-compromised canines.



These types of parasites are also known to spread from animals to humans through contaminated materials.



Many of them linger in the environment, which increases the risk for anyone handling infected objects or soil.



<h2 class="wp-block-heading" id="h-high-dog-traffic-areas-and-parasites">High dog traffic areas and parasites </h2>



Dogs that visit more than one park or spend significant time off-leash have a greater chance of <a href="https://www.earth.com/news/antibiotic-resistant-superbugs-are-being-passed-from-pets-to-humans/" target="_blank" rel="noreferrer noopener">picking up infections</a>. 



Overlapping areas with high dog traffic can make it easier for parasites to spread, especially if waste is not disposed of properly.



These newly identified parasite infection patterns point to an urgent need for consistent hygiene practices and vigilant parasite prevention measures among dog owners. Missing these steps could lead to larger issues in households and communities.



<h2 class="wp-block-heading" id="h-protecting-dogs-from-parasites">Protecting dogs from parasites</h2>



“Administer year-round broad-spectrum parasite control with efficacy against heartworm, intestinal parasites, fleas, and ticks. Control of parasites with zoonotic potential is essential,” noted the <a href="https://capcvet.org/guidelines/general-guidelines/" target="_blank" rel="noreferrer noopener">Companion Animal Parasite Council </a>(CAPC). 



Such preventive care can also lower veterinary bills over time. Early treatment helps ensure that dogs remain safe from conditions that might otherwise worsen and spread.



“All dogs should have a veterinary examination at least annually. For many dogs, more frequent visits may be appropriate,” stated the <a href="https://www.avma.org/resources-tools/avma-policies/aaha-avma-canine-preventive-healthcare-guidelines" target="_blank" rel="noreferrer noopener">American Veterinary Medical Association</a> (AVMA). Consistent check-ups can catch issues early before they turn into bigger problems.



Veterinarians can recommend parasite prevention methods suited to each dog’s lifestyle. They can also help pet owners to address any new concerns about health or behavior.



<h2 class="wp-block-heading" id="h-stopping-the-spread-of-infections">Stopping the spread of infections </h2>



Some of the parasites identified by the experts can affect humans through direct or indirect contact - with children and older family members facing the greater risk. 



Hands-on moments with pets may carry hidden dangers if basic precautions are neglected. 



Habits like washing hands and tidying up after dogs are simple actions that can make a big difference by stopping infections from spreading between households or within neighborhoods.



<h2 class="wp-block-heading" id="h-maintaining-cleanliness-in-play-areas">Maintaining cleanliness in play areas</h2>



Dog parks can still be fun if everyone does their part in disposing of waste and keeping the area clean. It is critical to use designated trash bins and avoid leaving any droppings behind, as parasites thrive in damp conditions.



Regular park maintenance further reduces contamination by preventing harmful organisms from circulating in the soil. A clean environment creates a healthier space for everyone.



<h2 class="wp-block-heading" id="h-tips-for-home-routines">Tips for home routines</h2>



An effective deworming schedule can shield pets from exposure to parasites that might be picked up outdoors. Over-the-counter remedies are not always reliable, so <a href="https://www.earth.com/news/early-neutering-linked-to-serious-health-risks-in-some-dog-breeds/">consulting a veterinarian</a> remains the best bet.



Families that allow pets on couches or beds may want to vacuum more frequently. This is especially true for homes with small children who explore surfaces by touch.



<h2 class="wp-block-heading" id="h-community-awareness-and-responsible-actions">Community awareness and responsible actions</h2>



Dog parks help maintain social bonds among pets and people in the community. Many owners appreciate these places because their pets can socialize and burn off excess energy.



Paying careful attention to <a href="https://www.earth.com/news/warning-dogs-drinking-from-public-water-sources-is-dangerous/">parasite control</a> does not eliminate the social benefit of these shared spaces. Instead, it helps everyone feel secure while enjoying all the perks of playing outdoors.



Active outreach by local pet groups can remind park visitors to be responsible. Handouts, reminders on social media, and polite signs in dog parks can spread the message without sounding harsh.



Any step that guides owners toward better cleaning habits or timely <a href="https://www.earth.com/news/dogs-on-vegan-diets-stay-healthier-and-visit-the-vet-less-often/">veterinary checks</a> is a win for public health. Simple changes can reshape how communities share public spaces like dog parks.



<h2 class="wp-block-heading" id="h-the-path-forward">The path forward</h2>



Informed decisions about parasite control allow <a href="https://www.earth.com/news/are-cat-people-really-more-crazy-than-dog-lovers/">dog lovers</a> to keep enjoying community parks without constant worry. This means routine vet care, proper hygiene, and thorough cleaning habits.



These measures benefit everyone who values recreational spaces that welcome four-legged friends. 



The new findings about <a href="https://www.earth.com/news/dog-killing-liver-fluke-parasite-discovered-us-colorado-river/" target="_blank" rel="noreferrer noopener">intestinal parasites</a> may sound unsettling, but vigilance can make a clear difference. Renewed awareness often spurs owners to take small but vital steps to protect their cherished companions.



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Dog parks may be fueling parasite outbreaks

Community dog parks are often seen as cheerful places where...

When you digest the fact that humans know less about the seamounts dotting our planet's oceans than about the vast expanse of outer space, it might take a moment to sink in. Only a fraction of these grandiose underwater mountains have even been mapped.



The 14,500 seamounts mapped to date are projected to be a mere fraction (less than 1%) of the actual total. This staggering disparity highlights how much of our oceanic world remains unexplored.



<h2 class="wp-block-heading" id="h-a-dormant-volcano-teeming-with-life">A dormant volcano teeming with life</h2>



The story of the Davidson Seamount is just one example. Its name is a misnomer of sorts, as it is an underwater inactive <a href="https://www.earth.com/news/study-reveals-how-underwater-volcanoes-become-explosive/" target="_blank" rel="noreferrer noopener">volcano</a> that is nestled off the Californian coast.



Discovered way back in 1933, this expansive entity covers 25 miles (40 kilometers) and has been dormant for the last 9.8 million years.



Despite the seeming desolation its description might suggest, this "dead" volcanic structure is buzzing with life.



It's home to magnificent coral reefs and extensive deep-sea <a href="https://www.earth.com/news/secret-garden-thermal-springs-accelerate-octopus-egg-hatching-by-years/" target="_blank" rel="noreferrer noopener">octopus gardens</a>, and offers a thriving ecosystem for marine animals including whales.



The unique biodiversity of the Davidson Seamount has made it a <a href="https://www.earth.com/news/underwater-mountain-discovered-is-two-miles-high-and-home-to-flying-spaghetti-monsters/" target="_blank" rel="noreferrer noopener">vital area</a> for marine research that has focused attention on the ecological importance of these underwater mountains.



<h2 class="wp-block-heading" id="h-the-mysteries-of-underwater-mountains">The mysteries of underwater mountains </h2>



The Davidson Seamount, however, supports just a tiny fraction of the underwater splendors that remain unexplored.



Take a voyage to the Canadian coast where another ancient, and notably active, volcano was discovered. The site was found to be covered in millions of colossal eggs, laid by the ethereal Pacific white skates. 



For comparison, the previously known nursery of this species (in the Galapagos) had a mere sprinkling of eggs, as noted by a marine biologist at Fisheries and Oceans Canada.



The most recent voyage of discovery was led by experts from the <a href="https://schmidtocean.org/" target="_blank" rel="noreferrer noopener">Schmidt Ocean Institute</a>. The team unearthed a staggering 1.5-mile-high (2.4 kilometer) seamount, accompanied by three others in the southern Pacific.



One of these seamounts, situated along the Nazca ridge off the Chilean coast, offered a vision so astonishing that the explorers were left awe-struck.



They found themselves amidst a multitude of species that had never been seen by human eyes, which led them to draw parallels with a journey "through the cosmos."



<h2 class="wp-block-heading" id="h-diverse-marine-species-revealed">Diverse marine species revealed</h2>



The month-long expedition proved highly fruitful. Unexpected residents of these depths were identified, including ghostly white <a href="https://www.earth.com/news/giant-sponge-gardens-found-deep-in-the-arctic-ocean/" target="_blank" rel="noreferrer noopener">sponge gardens</a>, flying spaghetti monsters (a type of colonial hydrozoan), Casper octopuses, millennium-old glass sponges and vast forests of bamboo corals.



A fascinating fact about the glass sponges is that they build intricate, cylindrical structures using spiky "spicules" and often house crustaceans until their death.



This unique interaction between different species creates a mutual relationship, where the captivated crustaceans clean the sponges and breed within them.



<h2 class="wp-block-heading" id="h-vibrant-marine-life-on-underwater-mountains">Vibrant marine life on underwater mountains </h2>



The expedition revealed a vibrant and unexpected color palette in the depths of the <a href="https://www.earth.com/news/ocean-life-100-new-sea-creatures-found-in-chile/" target="_blank" rel="noreferrer noopener">Chilean seamount</a>, with numerous species displaying bright red hues.



<div class="wp-block-sendtonews-playerselector">[sendtonews key="C3wgg1waZW-4165386-12187" type="single"]</div>



Strange as it may seem, this coloration acts as a form of invisibility cloak in the depths where red light is absorbed first, leaving the species to appear black in the depths.



Alongside these species were cactus-like sea urchins and marine sponges that towered to human height.



A consortium of scientists from Ocean Census, who led the expedition planning, noted that this region of the southern Pacific exhibited a high level of endemic species - those that cannot be found anywhere else in the world.



<h2 class="wp-block-heading" id="h-seamounts-in-a-changing-climate">Seamounts in a changing climate</h2>



The significance of seamounts extends beyond hosting unique and vibrant marine life.



According to the National Oceanic and Atmospheric Administration, seamounts are emerging as <a href="https://www.earth.com/news/seamounts-underwater-mountains-impact-ocean-circulation-climate-surprising-ways/" target="_blank" rel="noreferrer noopener">vital sanctuaries</a> for marine life amidst the growing threats of climate change and warming oceans.



Their steep surfaces offer the right conditions for cold-water corals, sponges, and other surface-growing creatures.



The currents around these seamounts stimulate an upsurge of nutrients from the ocean floor, triggering phytoplankton growth that supports food chains within the marine world.



Additionally, these nutrient-rich areas act as hotspots for biodiversity, supporting species that are often rare or endemic to these environments.



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'Alien-like' marine life found on underwater mountains includes 100 new species

When you digest the fact that humans know less about...

After nearly 250 years of informal recognition, the bald eagle has officially been designated as the national bird of the United States. On Christmas Eve 2024, President Joe Biden signed into law a bill amending title 36 of the United States Code to declare the bird’s status.



"For nearly 250 years, we called the bald eagle the national bird when it wasn't," said Jack Davis, co-chair of the National Bird Initiative for the <a href="https://www.nationaleaglecenter.org/" target="_blank" rel="noreferrer noopener">National Eagle Center</a>. "But now the title is official, and no bird is more deserving."



<h2 class="wp-block-heading" id="h-a-proclamation-centuries-in-the-making">A proclamation centuries in the making</h2>



In June 1782, the bald eagle was adopted as the Coat of Arms for the United States Great Seal. Despite its symbolic significance, the bird’s status as the national bird was never acknowledged by law until now.&nbsp;



The legislation, introduced on National American Eagle Day (June 20, 2024), was sponsored by Senator Amy Klobuchar of Minnesota and supported by a bipartisan group, including Senators Tina Smith (D-MN), Cynthia Lummis (R-WY), and Markwayne Mullin (R-OK).



<h2 class="wp-block-heading" id="h-a-symbol-of-freedom-nbsp">A symbol of freedom&nbsp;</h2>



"The bald eagle has long been a symbol of freedom and patriotism for our nation," Senator Mullin said in a statement. 



"It's only fitting we officially designate the bald eagle the national bird of the United States. I was glad to join my colleagues in leading this bipartisan effort and appreciate the House's swift consideration."



Jack Davis called the move “long overdue,” emphasizing the bird’s unique role as a symbol of American values and its indigenous roots in North America.



<h2 class="wp-block-heading" id="h-historical-debate-over-the-bald-eagle">Historical debate over the bald eagle</h2>



Although widely revered today, the bald eagle’s path to national recognition was not without debate. Founding Father Benjamin Franklin famously opposed its selection as a national emblem, disparaging the bird as one of “bad moral character.”



However, for generations, the bald eagle has been celebrated for its attributes of strength, courage, and freedom - qualities deeply associated with the American spirit.&nbsp;



Unlike other <a href="https://www.earth.com/news/australias-largest-eagle-was-a-massive-predator/" target="_blank" rel="noreferrer noopener">eagles</a>, the bald eagle is found exclusively in North America, making it a uniquely fitting representative of the United States.



<h2 class="wp-block-heading" id="h-recovering-from-the-brink-of-extinction">Recovering from the brink of extinction</h2>



The bald eagle’s journey reflects the resilience of the nation it symbolizes. Once on the brink of extinction due to habitat destruction, hunting, and pesticide use, the bird was listed as endangered in 1967.&nbsp;



Thanks to conservation efforts, including the banning of DDT and the enactment of the National Emblem Act of 1940, bald eagles have made a dramatic comeback.



By 2020, the bald eagle population had reached 316,700 individuals - which quadrupled the estimated number of these birds in 2009.&nbsp;



This recovery demonstrates the power of preservation and the collective commitment to safeguarding America’s wildlife. However, <a href="https://www.earth.com/news/bald-eagles-are-threatened-by-avian-influenza/" target="_blank" rel="noreferrer noopener">challenges persist</a>.&nbsp;



In recent years, threats like avian influenza (bird flu) have emerged. Since January 2022, at least 136 bald eagles have died from bird flu across 24 states.&nbsp;



Furthermore, habitat loss, <a href="https://www.earth.com/news/lead-ammunition-is-a-silent-threat-to-bald-eagle-recovery/" target="_blank" rel="noreferrer noopener">lead poisoning</a> from hunting ammunition, and environmental contamination continue to pose risks.



Sustained efforts are needed to address these challenges and ensure the long-term survival of the bald eagle.



<h2 class="wp-block-heading" id="h-the-bald-eagle-a-national-icon">The bald eagle: A national icon</h2>



The legislation is particularly meaningful for the state of Minnesota, which is home to one of the largest bald eagle populations in the country.&nbsp;



“The bald eagle is a symbol of our country’s freedom and strength. In Minnesota, we are proud to call ourselves home to one of the largest populations of bald eagles in the country as well as the National Eagle Center in Wabasha,” said Senator Klobuchar.&nbsp;



Preston Cook is co-chair of the National Bird Initiative for the National Eagle Center and author of the book American Eagle - A Visual History of Our National Emblem.&nbsp;



"This is an exciting day. The Bald Eagle has symbolized American ideals since its placement on the Great Seal in 1782," said Cook. "With this legislation, we honor its historic role and solidify its place as our national bird and an emblem of our national identity."



<h2 class="wp-block-heading" id="h-national-symbols-of-the-united-states">National symbols of the United States </h2>



In the past, the United States designated other symbols to represent its natural heritage and cultural identity. Among these, the rose holds the title of the national flower, chosen for its widespread beauty, significance in American culture, and long history as a symbol of love and resilience.&nbsp;



The oak, revered for its strength and longevity, was declared the national <a href="https://www.earth.com/news/should-we-cut-down-all-oak-trees-isoprene-emissions-air-pollution-climate-change/" target="_blank" rel="noreferrer noopener">tree</a> in 2004 to represent the enduring spirit of the nation.&nbsp;



The <a href="https://www.earth.com/news/plains-bison-are-in-danger-from-rising-temperatures/" target="_blank" rel="noreferrer noopener">bison</a>, an iconic species of the American plains, was named the national mammal in 2016 to honor its historical and ecological importance, as well as its recovery from near extinction.&nbsp;



The formal designation of the bald eagle as the national bird marks a new chapter in its history - one that reflects the values and aspirations of the United States.&nbsp;



As this majestic bird continues to thrive, its legacy as a symbol of freedom and resilience is now protected by law for future generations.



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It's official: The bald eagle is the national bird of the United States 

After nearly 250 years of informal recognition, the bald eagle...

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Today’s Video of the Day comes from the <a href="https://www.esa.int/">European Space Agency</a> (ESA) and features a look at their Space Storm Hunter, also known as the Atmosphere-Space Interactions Mission, and its journey to space.
The instrument was launched on April 2nd, 2018 from the Kennedy Space Center in Florida and then was installed on the <a href="https://www.earth.com/image/central-america/">International Space Station</a>.
According to ESA, this marks “the first time that such a set of sensitive cameras, light sensors and X- and gamma-ray detectors will study the anatomy of luminous phenomena in Earth’s upper atmosphere and bursts of high-energy radiation.”
&#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.esa.int/">European Space Agency</a>

The Space Storm Hunter’s journey to space