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...

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



Image Credit: ESA



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

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



Image Credit: NASA Earth Observatory



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Retreating glaciers and expanding meltwater lakes in Alaska

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

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



Image Credit: NASA Earth Observatory&nbsp;



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Mountain peaks and plains of central Mongolia 

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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Spiral galaxy NGC 1559 is a loner in outer space

Leopards are known for their elusive nature, but now their roars are revealing secrets that could transform wildlife conservation. 



Every voice in nature is distinctive, and this individuality extends beyond humans to one of Earth’s most majestic predators. 



<h2 class="wp-block-heading" id="h-leopard-vocal-signatures">Leopard vocal signatures </h2>



Deep in the heart of Nyerere National Park in Tanzania, a breakthrough study has uncovered the unique vocal signatures of leopards, offering new possibilities for understanding and protecting these enigmatic <a href="https://www.earth.com/news/snow-leopard-day-2024-honoring-the-elusive-mountain-ghost/" target="_blank" rel="noreferrer noopener">big cats</a>.



Over an expansive 450 square kilometers, a collaborative team of scientists combined their expertise to decode the signatures hidden within a leopard’s roar.



The team included researchers from the <a href="https://www.exeter.ac.uk/" target="_blank" rel="noreferrer noopener">University of Exeter</a>, the Wildlife Conservation Unit at the University of Oxford, Lion Landscapes, the Frankfurt Zoological Society, and key Tanzanian organizations.



Supported by computer scientists, the study reveals an innovative approach to studying leopards, which could have profound implications for their <a href="https://www.earth.com/news/un-report-calls-for-global-change-to-stop-biodiversity-loss/" target="_blank" rel="noreferrer noopener">conservation</a>.



<h2 class="wp-block-heading" id="h-leopards-have-distinct-roars">Leopards have distinct roars</h2>



By combining large-scale camera trapping with autonomous audio recording, the researchers made a remarkable discovery: each leopard has a distinct roar. 



This unique vocal signature allowed the experts to identify individual leopards with an impressive 93% accuracy. This innovative approach addresses the significant challenges that scientists face in monitoring these elusive predators in the wild.



Leopards are solitary, nocturnal beings that cover vast terrains, leaving behind little reliable <a href="https://www.earth.com/news/assessments-of-large-african-carnivores-urgently-needed/" target="_blank" rel="noreferrer noopener">data</a> for researchers. There is a desperate need for such information to help prevent their alarming decline, which is mainly due to habitat loss and human-wildlife conflicts.



<h2 class="wp-block-heading" id="h-science-that-could-save-leopards">Science that could save leopards</h2>



There is also a lack of scientific research on the distinct "sawing roar" of a leopard. This roar, a repeated pattern of low-frequency strokes audible even from a kilometer away, is primarily used for attracting mates and territorial defense.



The research team discovered that these unique roars could be the focus of more extensive studies such as population estimates.



Such data can greatly aid policymakers and conservationists in managing landscapes and reducing human-wildlife conflicts.



<h2 class="wp-block-heading" id="h-understanding-ecosystems-in-a-new-way">Understanding ecosystems in a new way</h2>



According to study lead author Jonathan Growcott, a PhD student at the University of Exeter, the discovery of unique vocal signatures demonstrates our limited knowledge about leopards and <a href="https://www.earth.com/news/large-carnivores-need-protection-to-avoid-extinction/" target="_blank" rel="noreferrer noopener">large carnivores</a>.



"We hope it will allow leopards to become the focus of more acoustically complex science such as population density studies and open the door to more work on how large carnivores use vocalizations as a tool," said Growcott.



The research also demonstrates how the integration of different technologies can enrich data collection and scientific understanding of ecosystems.



"Importantly, our success in using a combination of different types of technology could hopefully lead others to think about how to integrate different types of technology into their research, as the rich data this provides could really push science ahead and help us understand ecosystems and landscapes in a much more holistic way.” noted Growcott.



The research was praised by Hazel Norman, CEO of the British Ecological Society. She described it as a brilliant demonstration of how ecologists apply novel ideas and technologies to gain new insights into our natural world.



Our journey of understanding leopards through their roars begins now, and it will open new doors to the conservation of these majestic creatures.



<h2 class="wp-block-heading" id="h-leveraging-technology-for-conservation">Leveraging technology for conservation</h2>



The success of this study highlights the transformative power of integrating advanced technology into <a href="https://www.earth.com/news/world-wildlife-conservation-day-2024-saving-species-from-extinction/" target="_blank" rel="noreferrer noopener">wildlife</a> research. 



By combining large-scale camera trapping with autonomous acoustic recording, the researchers overcame the challenges posed by leopards' solitary and nocturnal habits.



This innovative approach not only identified individual leopards but also opened doors for future applications, such as tracking population changes and monitoring habitat use over time.



As human-wildlife conflicts and habitat loss threaten leopard populations, such tools can serve as critical resources for policymakers and conservationists. 



These technologies enable data collection in previously inaccessible areas, ensuring that elusive species like leopards can be studied and protected effectively.



The potential to scale this methodology across other regions and species further highlights its significance in global wildlife conservation efforts.



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Leopards reveal their identity through a distinct roar

Leopards are known for their elusive nature, but now their...

Heart attacks cast an unexpected shadow over the much-loved winter holidays. On one hand, the season is filled with joy and cheer, reunions and festivities, cakes and candies. On the other hand, it emerges as a surprising time of sorrow, with the highest rate of heart-attack-related deaths reported during this time of the year.



Yes, you read that right. The last week of December, celebrated globally with pomp and show, coincidentally marks a peak in mortality due to cardiac events.



According to the <a href="https://www.heart.org/" target="_blank" rel="noreferrer noopener">American Heart Association</a> (AHA), a leading advocate for heart and brain health, the holiday season records a significant rise in heart-related fatalities.



As we celebrate with festive traditions, it’s crucial to recognize this concerning trend. By staying aware and embracing heart-healthy habits during this busy time, we can help protect our health and potentially save lives.



<h2 class="wp-block-heading" id="h-holidays-raise-the-risk-of-a-health-emergency">Holidays raise the risk of a health emergency </h2>



The <a href="https://www.earth.com/news/americans-struggle-to-maintain-a-healthy-routine-during-the-holidays/" target="_blank" rel="noreferrer noopener">holidays</a> serve as a much-needed break from the monotonous routine. But they also disrupt our daily habits with an influx of festive food and drinks, late-night parties, and increased stress - both physical and emotional.



The combination of indulgence and neglect creates a perfect storm for health risks, often catching people off guard.



Dr. Mitchell S.V. Elkind, Chief Clinical Science Officer at the American Heart Association, stated: "The holidays are a busy, often stressful, time for many of us. Routines are disrupted; we may tend to eat and drink more and exercise and relax less. We’re getting too little sleep and experiencing too much stress."



"We also may not be listening to our bodies or paying attention to warning signs, thinking a trip to the doctor can wait until after the new year."



Together, these factors create a dangerous convergence that significantly raises the risk of a heart emergency. 



"While we don’t know exactly why there are more deadly heart attacks during this time of year, it’s important to be aware that all of these factors can be snowballing contributors to increasing the risk for a deadly <a href="https://www.earth.com/news/deep-sleep-stimulation-can-improve-cardiac-function-overnight/" target="_blank" rel="noreferrer noopener">cardiac</a> event," said Dr. Elkind.



<h2 class="wp-block-heading" id="h-holiday-heart-attack-deaths">Holiday heart attack deaths </h2>



Studies published in the journal Circulation, an esteemed publication of the AHA, confirm the rise in cardiac events during the winter holiday season.



The researchers point out that the most cardiac deaths occur on December 25, followed by December 26 and January 1. 



The cold winter weather plays a part by constricting blood vessels and restricting blood flow. But research suggests that holiday stress may be the biggest contributing factor. 



Intriguingly, a similar pattern was observed in sunny LA County, where December and January registered a third more <a href="https://www.earth.com/news/more-people-die-from-heart-attacks-during-the-holidays/" target="_blank" rel="noreferrer noopener">heart attack deaths</a> than the balmy months of June through September. 



The trend held true even in New Zealand, where December is a summer month, lending support to the theory of <a href="https://www.earth.com/news/holiday-stress-can-take-a-major-toll-on-health-and-well-being/" target="_blank" rel="noreferrer noopener">festive stress</a>.



What's alarming is that the majority of these holiday heart attack deaths happen mostly outside of the hospital.



"This highlights the importance of recognizing symptoms and seeking immediate medical care," said Dr. Elkind. "Don’t ignore heart attack warning signs because you don’t want to spoil the holidays, the consequences could be much worse."



<h2 class="wp-block-heading" id="h-make-your-health-a-priority">Make your health a priority </h2>



As we gather around the table for a festive feast, let’s not forget to prioritize our health. Recognizing the symptoms of a heart attack - which are different for men and women - is essential, as swift action and immediate medical care can save lives.



Enjoy the celebrations, but remember moderation is key. A balanced diet during the holidays can help you stay healthy. Consider making small, healthy swaps to your favorite dishes and keep an eye on your salt intake to support your heart health.



Amidst the holiday hustle, carve out moments of calm for self-care. Managing stress effectively and staying active - even through a leisurely walk with loved ones - can go a long way in maintaining your well-being.



Lastly, don’t let the holiday excitement disrupt your medication routine. Use a medication chart or reminders to ensure you stay on track and monitor your <a href="https://www.earth.com/news/just-5-minutes-of-daily-exercise-can-lower-blood-pressure/" target="_blank" rel="noreferrer noopener">blood pressure</a> regularly. A little planning can help you enjoy the season while safeguarding your health.



For more tips on heart healthy living during holidays and all year long, visit <a href="https://www.heart.org/" target="_blank" rel="noreferrer noopener">heart.org</a>.



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Heart attack deaths spike during the winter holidays

Heart attacks cast an unexpected shadow over the much-loved winter...

Honey, often described as “liquid gold,” has captivated civilizations for millennia. Long prized for its sweetness, it has also been used in diverse cultures and traditions to soothe sore throats, support wound healing, and even address infections.&nbsp;



While honey’s anti-inflammatory, antioxidant, and antimicrobial properties have earned it a place in both kitchens and home remedies, questions remain about the science behind these claims.&nbsp;



What exactly gives honey its therapeutic potential, and how do the microorganisms within it influence its benefits and safety?



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



When people think of honey, they usually picture a sticky, golden sweetener ready to drizzle on toast or stir into tea. Yet behind this simplicity lies a rich microbial community.&nbsp;



Honey carries a variety of <a href="https://www.earth.com/news/microbes-laid-the-foundation-for-early-life-on-earth/" target="_blank" rel="noreferrer noopener">microorganisms</a> that together create a microscopic ecosystem. 



This local microbiome in honey prompts inquiries about its safety, particularly regarding how honey is produced, whether it’s consumed raw or pasteurized, and the risks it may pose for certain individuals, such as infants.



Honey primarily consists of sugars (mainly fructose and glucose), water, and organic compounds produced by <a href="https://www.earth.com/news/bees-are-making-less-honey-and-five-decades-of-data-reveals-why/" target="_blank" rel="noreferrer noopener">bees</a>. 



While the western honeybee, Apis mellifera, is the dominant species in large-scale honey production, at least eight other bee species - including Apis cerana and Apis nigrocincta - are also known to produce honey. 



Each species, along with environmental and floral variations, can influence the composition of the honey they create.



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



Bees generate honey through a multifaceted process involving the collection of nectar and honeydew from flowers and subsequent enzymatic transformations within the hive.&nbsp;



During this process, microorganisms - such as Bacillus, Saccharomyces, and Aspergillus - are introduced to the honey via the bees’ digestive tracts and from external sources like air, soil, and plant matter.



Some microbes, particularly lactic acid bacteria like Lactobacillus and Bifidobacterium, are beneficial. They can contribute to honey’s acidity and preserve it against spoilage.&nbsp;



Conversely, certain yeasts, such as Candida and Saccharomyces, may thrive in honey that has excessive moisture, potentially causing fermentation or spoilage. 



Thus, honey’s microbial profile is shaped by the floral environment, geographic location, bee health, and other situational elements.



The <a href="https://www.earth.com/news/honey-bees-face-a-multitude-of-complex-stressors-in-the-field/" target="_blank" rel="noreferrer noopener">honeybee</a> gut microbiome itself plays a critical part in shaping honey’s characteristics. In addition to lactic acid bacteria, microbes like Enterobacter and Klebsiella help maintain bee health.&nbsp;



If this beneficial microbial community becomes unbalanced - due to factors such as disease or environmental stress - bees can become susceptible to infections, including fungal pathogens like Aspergillus fumigatus.&nbsp;



This fungus can harm both immunocompromised humans and bee larvae, emphasizing the shared health interests of bees and humans.



<h2 class="wp-block-heading" id="h-honey-s-remarkable-self-preservation-abilities">Honey’s remarkable self-preservation abilities</h2>



Despite harboring an assortment of microbes, honey naturally resists spoilage and pathogenic bacteria. One central reason lies in the enzyme glucose oxidase, which worker bees secrete from their hypopharyngeal glands.&nbsp;



When bees combine this enzyme with glucose in the nectar, it produces hydrogen peroxide (H₂O₂) and water. The resulting hydrogen peroxide remains encased in the honey, helping lower its pH to levels unfavorable for bacterial growth.



Additionally, honey’s high sugar content and minimal water availability (i.e., low moisture) create an osmotic environment hostile to many microorganisms. 



These traits together form a potent natural defense that helps honey avoid quick spoilage, even when stored at room temperature for extended periods.



Still, honey’s acidity can vary according to seasonal flora and the particular flowers the bees visit. More than 300 honey varieties exist around the world, each uniquely shaped by local botanical and environmental factors.&nbsp;



In the United States alone, one can find distinct honeys like buckwheat honey in the Midwest or citrus blossom honey in Florida and southern California.&nbsp;



Globally, the famed Manuka honey originates from Leptospermum scoparium flowers in New Zealand and Australia and is celebrated for its heightened antibacterial effects, often attributed to methylglyoxal (MGO).



<h2 class="wp-block-heading" id="h-medicinal-properties-of-honey">Medicinal properties of honey</h2>



Manuka honey is one of the most researched types, largely due to the presence of MGO, which is formed from dihydroxyacetone (DHA) in Manuka flower nectar.&nbsp;



Studies suggest that Manuka honey is more potent against certain bacteria, like Pseudomonas aeruginosa, than generic honeys. 



However, evidence shows that various constituents of Manuka honey, including hydrogen peroxide and an osmotic effect, work together to amplify its antimicrobial strength.



While Manuka honey has garnered attention for wound care and infection control, clinical research on its effectiveness for broader health issues - such as <a href="https://www.earth.com/news/new-tool-detects-changes-in-gut-health-to-help-prevent-disease/" target="_blank" rel="noreferrer noopener">gut health</a>, diabetes, or cancer - remains limited.&nbsp;



A few clinical trials point to Manuka honey’s potential to ease throat discomfort in chemotherapy patients, but these studies have not conclusively shown that honey surpasses existing treatments.&nbsp;



Further investigations are needed to determine whether honey’s properties can be harnessed reliably in mainstream healthcare.



<h2 class="wp-block-heading" id="h-balancing-benefits-and-safety">Balancing benefits and safety</h2>



One key distinction in honey is whether it’s raw or pasteurized. Raw honey undergoes minimal filtration and retains more of its natural microbes, including pollen particles and other hive components.&nbsp;



Some argue this confers extra health advantages, like enhanced antioxidant and probiotic qualities. However, raw honey also poses allergy risks to individuals sensitive to pollen or bee-derived proteins.



Pasteurized honey, processed at high temperatures to lower its microbial load, can be safer in terms of minimizing fermentation or spoilage. 



Yet pasteurization may also reduce honey’s beneficial enzymes and microbes, potentially lessening any therapeutic qualities. 



Regardless of processing, improper honey storage - especially exposure to moisture, heat, or air - can trigger spoilage or microbial growth, underscoring the need for careful handling.



<h2 class="wp-block-heading" id="h-honey-consumption-risks">Honey consumption risks</h2>



While honey is generally considered safe, one well-known concern is the presence of Clostridium botulinum spores. Though relatively rare, these spores can produce a potent neurotoxin that induces botulism, a serious condition marked by muscle weakness and possible paralysis.&nbsp;



Infants under one year old are particularly vulnerable because their developing digestive tracts are ill-equipped to counteract C. botulinum spores. 



Consequently, pediatric and public health guidelines strongly advise against giving honey to infants less than 12 months of age. 



Although botulism risk in older children and adults is minimal, the possibility of contamination underscores the importance of following storage and processing recommendations.



<h2 class="wp-block-heading" id="h-honey-s-role-in-health-and-research">Honey’s role in health and research</h2>



As scientists deepen their understanding of honey’s chemistry and the interplay of its microbial inhabitants, possibilities emerge for broader applications.&nbsp;



Honey’s mix of sugars, enzymes, and natural compounds could prove relevant in addressing <a href="https://www.earth.com/news/scientists-create-viruses-to-combat-antibiotic-resistant-bacteria/" target="_blank" rel="noreferrer noopener">antibiotic-resistant</a> infections, improving wound healing, and perhaps even aiding in metabolic or gastrointestinal disorders. However, robust, large-scale clinical trials remain necessary to confirm many of these potential benefits.



Still, anecdotal evidence and limited studies already support honey’s use in alleviating mild conditions, like sore throats or minor cuts. Traditional medicine in many cultures has leveraged honey’s soothing properties for centuries.&nbsp;



Modern science is now trying to define these uses more precisely, distinguishing home remedies from evidence-based healthcare solutions.



<h2 class="wp-block-heading" id="h-a-spectrum-of-varieties">A spectrum of varieties</h2>



Honey is incredibly diverse, owing to factors like bee species, local flora, and environmental conditions. Orange blossom honey from Florida, for example, differs not only in taste from avocado honey in California or buckwheat honey in New York, but also in antioxidant capacity and potential microbial composition.&nbsp;



Globally, Manuka honey remains the most studied, but dozens of specialty honeys in various regions hold cultural and medicinal significance, reflecting how nature’s subtleties shape each batch.



Understanding this variety can guide consumers seeking specific flavors or purported health benefits. It can also inform researchers studying how different nectar sources yield distinct antimicrobial or antioxidant properties in honey, potentially expanding its role in food science and medicine.



<h2 class="wp-block-heading" id="h-looking-ahead-honey-s-future-as-a-resource">Looking ahead: Honey’s future as a resource</h2>



Honey stands as an intriguing intersection of biology, chemistry, ecology, and culinary art. While marketed primarily as a sweetener, its composition reveals a wealth of complex interactions among sugars, enzymes, microbes, and floral compounds.&nbsp;



These interactions contribute to honey’s distinctive flavor profiles, antimicrobial resilience, and prospective therapeutic potential.



Ongoing research into honey’s properties - including how it fights certain <a href="https://www.earth.com/news/intestinal-bacteria-could-help-you-live-a-very-long-life/" target="_blank" rel="noreferrer noopener">bacteria</a>, whether it can bolster wound healing, and its broader impact on human health - reflects a growing recognition of nature’s capacity to inspire and innovate.&nbsp;



As studies become more rigorous, honey’s status in modern integrative medicine and food science may continue to rise, provided that researchers address the gaps and ensure consumer safety.



<h2 class="wp-block-heading" id="h-honey-as-a-natural-marvel-nbsp">Honey as a natural marvel&nbsp;</h2>



Honey’s enduring popularity stems not only from its sweet taste but also from the remarkable benefits attributed to it over centuries of traditional use.&nbsp;



Contemporary investigations highlight how honey’s microbial makeup, enzymatic processes, and sugar chemistry coalesce to create a product that is both delicious and potentially health-affirming.&nbsp;



Although definitive scientific consensus on many of honey’s medical applications remains elusive, its low-risk nature and storied past suggest that honey will continue to delight and possibly heal.



By bridging knowledge from microbiology, beekeeping, environmental science, and clinical research, scientists stand poised to uncover additional facets of honey’s significance.&nbsp;



Whether stirred into tea or considered for more formal therapeutic roles, honey’s multifaceted profile ensures that it remains a subject of fascination in culinary, cultural, and medical contexts.



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Nature's sweet remedy: Honey is a microbial marvel

Honey, often described as “liquid gold,” has captivated civilizations for...

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Today’s Video of the Day comes from <a href="http://www.su.se/english/">Stockholm University</a> and features a look at how Baltic Sea fish are in high demand from both humans and animals.
Birds, seals, <a href="https://www.earth.com/news/older-fish-disappearing/">commercial fishery</a>, and recreational fishing are all after fish from the Baltic Sea, which include pike, perch, whitefish, pikeperch, sea trout, vendace, cod, sprat, and herring.
According to the research, human fishing consumes 700,000 tons of Baltic Sea fish per year, while both seals and birds consume 100,000 tons each. 
 &#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="http://www.su.se/english/">Stockholm University</a>, Felicia Wibe

Everyone wants a piece of Baltic Sea fish