<p>Today's <strong>Image of the Day</strong> from NASA Earth Observatory features an astronaut view of the Aladaghlar Mountains in northwestern Iran.</p>



<p>These <a href="https://www.earth.com/news/how-and-why-do-mountains-form-new-theories-for-an-age-old-mystery/" target="_blank" rel="noreferrer noopener">mountains</a> are known for their strikingly colorful landscapes, which make them stand out among other mountain ranges.</p>



<h2 class="wp-block-heading" id="h-landscape-of-the-aladaghlar-mountains">Landscape of the Aladaghlar Mountains</h2>



<p>"Ridges cast shadows in the valleys and other low elevation areas, creating a three-dimensional appearance. Human alterations to the landscape are most evident in riverbeds, where the even topography is easier to build on and navigate," said <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>.</p>



<p>"Natural processes over millions of years have folded rock layers of various compositions and colors into the curved patterns seen here. These folds are produced by tectonic forces operating along the convergent plate boundary of the Arabia and Eurasia plates." </p>



<h2 class="wp-block-heading" id="h-the-rainbow-mountains">The Rainbow Mountains</h2>



<p>One of the most remarkable features of the Aladaghlar Mountains is the vivid coloration of their slopes. </p>



<p>The name "Aladaghlar" translates to "colorful mountains," which is a testament to their unique appearance.&nbsp;They are also known as the Rainbow Mountains.</p>



<h2 class="wp-block-heading" id="h-wildlife-of-the-aladaghlar-mountains">Wildlife of the Aladaghlar Mountains </h2>



<p>The Aladaghlar Mountains are part of a larger <a href="https://www.earth.com/news/mountain-ecosystems-are-in-urgent-need-of-protection/" target="_blank" rel="noreferrer noopener">ecosystem</a> that includes forests, meadows, and rivers, contributing to a rich biodiversity. </p>



<p>The region supports a variety of wildlife, including several species that are unique to the area. The diverse wildlife add to the natural beauty and ecological importance of these <a href="https://www.earth.com/news/how-and-why-do-mountains-form-new-theories-for-an-age-old-mystery/" target="_blank" rel="noreferrer noopener">mountains</a>.</p>



<p>Among the larger mammals, the mountains host species such as brown bears, Persian leopards, and wild goats. The Aladaghlar Mountains also support smaller mammals, including foxes, hares, and various rodent species.&nbsp;</p>



<p><a href="https://www.earth.com/news/how-mountains-influence-bird-evolution/" target="_blank" rel="noreferrer noopener">Birdlife</a> is abundant, including eagles, falcons, and a variety of songbirds. Reptiles like lizards and snakes are commonly found in the more humid areas, as well as amphibians.&nbsp;</p>



<h2 class="wp-block-heading" id="h-cultural-significance-of-the-region">Cultural significance of the region</h2>



<p>In addition to their natural appeal, the Aladaghlar Mountains hold cultural significance. The region has a rich history, with evidence of ancient civilizations and historical sites. </p>



<p>Local communities have their unique cultures and traditions, which have been influenced by the natural environment of the mountains.</p>



<h2 class="wp-block-heading" id="h-geology-of-the-aladaghlar-mountains-nbsp">Geology of the Aladaghlar Mountains&nbsp;</h2>



<p>The geological history of these <a href="https://www.earth.com/news/mountains-both-carbon-sinks-and-carbon-sources/" target="_blank" rel="noreferrer noopener">mountains</a> is a fascinating tale of millions of years of natural processes.</p>



<p>The Aladaghlar Mountains are primarily composed of sedimentary rocks that have accumulated over millions of years. These sediments include sandstones, siltstones, shales, and conglomerates.</p>



<h3 class="wp-block-heading" id="h-mineral-deposition-nbsp">Mineral deposition&nbsp;</h3>



<p>The varying colors of the Aladaghlar Mountains are largely due to the presence of different minerals in the sedimentary layers. For example, red and orange hues are typically due to iron oxides, while greens can result from copper compounds.</p>



<p>These minerals were deposited in the sedimentary rocks through processes such as chemical precipitation, biological activity, and the weathering of parent rocks.</p>



<h3 class="wp-block-heading" id="h-tectonic-activity">Tectonic activity</h3>



<p>The region has experienced significant tectonic activity due to its location near the convergent boundary between the Arabian and Eurasian plates. This tectonic activity has caused the uplift and folding of the sedimentary layers, creating the mountain range.</p>



<p>The compression and folding associated with tectonic movements have also contributed to the exposure of the colorful strata that were originally deposited horizontally.</p>



<h3 class="wp-block-heading" id="h-erosion-and-weathering">Erosion and weathering</h3>



<p>Over time, erosion and weathering processes have played a crucial role in shaping the Aladaghlar Mountains. </p>



<p>Wind, water, and temperature variations have eroded the softer rock layers more quickly than the harder ones, creating the distinctive ridges and valleys seen today.</p>



<p>These erosive processes have also helped to expose the underlying layers, revealing the vibrant colors and intricate patterns that attract tourists and geologists alike.</p>



<h2 class="wp-block-heading">Tales and legends</h2>



<p>One of the most famous tales associated with the Aladaghlar Mountains is that of a hidden treasure buried deep within the mountains by an ancient Persian king.&nbsp;</p>



<p>According to legend, the treasure is guarded by mystical creatures and can only be found by someone pure of heart and brave enough to face the challenges of the mountain.</p>



<h3 class="wp-block-heading">The shepherd and the fairy</h3>



<p>Another local legend tells the story of a young shepherd who fell in love with a fairy he encountered in the Aladaghlar Mountains. The fairy granted the shepherd three wishes, but warned him that the wishes would come with consequences.&nbsp;</p>



<p>Despite the warning, the shepherd made his wishes, which ultimately led to his downfall, serving as a cautionary tale about the dangers of greed.</p>



<h3 class="wp-block-heading">The healing springs</h3>



<p>The Aladaghlar Mountains are also said to be home to a spring with magical healing properties. According to folklore, those who bathe in the spring or drink its water are cured of all ailments.&nbsp;</p>



<p>However, the location of the spring is a closely guarded secret, known only to a few wise elders in the nearby villages.</p>



<h3 class="wp-block-heading">The spirit of the mountain&nbsp;</h3>



<p>Some locals believe that the Aladaghlar Mountains are inhabited by a protective spirit, who watches over the land and its people.&nbsp;</p>



<p>This spirit is said to bring good fortune to those who respect the mountain and its natural beauty, but misfortune to those who exploit or harm it.</p>



<p>Image Credit: NASA Earth Observatory&nbsp;</p>



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The Aladaghlar Mountains of northwestern Iran

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

<p>Today's <strong>Image of the Day</strong> from NASA Earth Observatory features the Corbassière glacier, a high-altitude glacier in Switzerland. The glacier originates on the northern slope of the Grand Combin, which is one of the highest peaks in the Pennine Alps.</p>



<p>Collectively, the <a href="https://www.earth.com/news/alpine-glaciers-will-lose-half-of-their-volume-by-2050/" target="_blank" rel="noreferrer noopener">alpine glaciers</a> of Switzerland have lost more than half of their volume since the 1930s.</p>



<h2 class="wp-block-heading" id="h-natural-archives-of-past-climate">Natural archives of past climate </h2>



<p>"Glaciers are natural archives of past climate. In their frozen layers lies evidence of Earth’s changing temperature and atmospheric composition. But as the climate warms, some of the longest records of our changing planet are melting away," said <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>.</p>



<p>"In just over two decades, Corbassière has shrunk in area and surface mass. The glacier was darker in 2023 due to lack of snow, and the glacier’s tongue had retreated."</p>



<h2 class="wp-block-heading" id="h-ice-cores-from-the-corbassiere-glacier">Ice cores from the Corbassière glacier</h2>



<p>To reconstruct past concentrations of atmospheric <a href="https://www.earth.com/news/how-do-aerosols-impact-the-climate/" target="_blank" rel="noreferrer noopener">aerosols</a>, a team of scientists analyzed ice cores that were collected from the Corbassière glacier in 2018 and 2020.&nbsp;</p>



<p>Aerosols are tiny airborne particles that are deposited in the ice. "Such information from glaciers around the world can provide clues about past environmental conditions thousands of years ago," noted NASA.</p>



<p>"Ice cores contain ammonium, nitrate, and sulfate ions - signatures of aerosols lacing the snow that’s deposited on glaciers year after year. Ion concentrations are lower in winter than in summer because less polluted air can rise from the valley when the air is cold."</p>



<p>When the researchers analyzed the ice core from 2018, they found seasonal fluctuations in the amount of ion deposits - which is what they expected to find.&nbsp;</p>



<p>"But when we went to core the glacier in 2020, we noticed melting on the surface right away,” said Margit Schwikowski, an environmental chemist at <a href="https://www.psi.ch/en" target="_blank" rel="noreferrer noopener">Paul Scherrer Institute</a> in Switzerland.&nbsp;</p>



<h2 class="wp-block-heading" id="h-rapid-surface-melting-on-corbassiere-glacier">Rapid surface melting on Corbassière glacier</h2>



<p>The experts determined that melting on the glacier's surface likely penetrated the glacier layers below and carried away the aerosol ions. </p>



<p>"This melting rendered the core unusable in the team’s research, and other attempts to core the glacier had the same result. The valuable information stored in the ice was destroyed," explained NASA.</p>



<p>Schwikowski has joined a team of other experts in an effort to preserve cores from the last remaining glaciers. Led by the <a href="https://www.ice-memory.org/" target="_blank" rel="noreferrer noopener">Ice Memory Foundation</a>, the goal of the project is to obtain ice cores from 20 endangered glaciers around the world in 20 years and collect them in a global <a href="https://www.earth.com/news/antarcticas-ice-has-a-history-of-rapid-and-unexpected-changes/" target="_blank" rel="noreferrer noopener">climate archive</a>.</p>



<p>“Glaciers are retreating worldwide, and we may find similar issues at other sites,” said Schwikowski. She added that even at the highest altitudes in the Alps, "glaciers are on the verge of becoming unsuitable as natural paleo-archives."</p>



<h2 class="wp-block-heading" id="h-features-of-the-corbassiere-glacier">Features of the Corbassière Glacier</h2>



<p>The Corbassière Glacier is a captivating natural feature located in the Swiss Alps, part of the canton of Valais. </p>



<p>The glacier stretches over approximately 9 kilometers, making it one of the significant glaciers in the region. It originates from the Grand Combin, an imposing mountain massif that reaches heights of over 4,300 meters, contributing greatly to the glacier's nourishment through snow and ice accumulation.</p>



<p>A distinct feature of the Corbassière Glacier is its accessibility and the dramatic scenery it offers, which attracts many hikers and nature enthusiasts. </p>



<p>One of the most notable attractions near the <a href="https://www.earth.com/news/doomsday-glacier-seems-to-have-lost-its-ability-to-recover/" target="_blank" rel="noreferrer noopener">glacier</a> is the Corbassière footbridge, a 210-meter long suspension bridge that provides stunning views of the glacier and the surrounding peaks. </p>



<p>This bridge not only enhances the experience for visitors but also serves as a crucial observation point for scientists studying glacier dynamics and the effects of climate change.</p>



<h2 class="wp-block-heading">The Swiss Alps&nbsp;</h2>



<p>The Swiss <a href="https://www.earth.com/news/snow-cover-in-the-alps-could-soon-be-cut-in-half/" target="_blank" rel="noreferrer noopener">Alps</a> are a majestic and expansive mountain range that stretches across the southern part of Switzerland, forming a part of the greater Alpine region that spreads across several countries in Europe.&nbsp;</p>



<p>Renowned for their stunning beauty and formidable peaks, the Swiss Alps are not just a geographical landmark but also a cultural symbol of Switzerland, epitomizing its identity as a nation of scenic landscapes and outdoor adventure.</p>



<p>The region is famous for its dramatic scenery, including towering mountains, pristine lakes, and picturesque valleys. Among these peaks are some of the highest in Europe, such as the Dufourspitze, part of the Monte Rosa massif, which is the highest point in Switzerland. </p>



<p>The Matterhorn, perhaps the most iconic of all Swiss mountains, is celebrated for its unique, pyramid-like shape and is a magnet for climbers and tourists alike.</p>



<p>Image Credit: NASA Earth Observatory</p>



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The Corbassière glacier in the Swiss Alps

<p>Today's <strong>Image of the Day</strong> from NASA Earth Observatory features thick haze over Thailand during the fire season. The photograph was captured on March 16, 2024 by the Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP satellite.</p>



<h2 class="wp-block-heading" id="h-waves-of-smoke-and-haze">Waves of smoke and haze</h2>



<p>"Each year in January and February, satellites begin to detect waves of smoke and fire in Southeast Asia, particularly in highland forests in Cambodia, Laos, Myanmar, and Thailand. <a href="https://www.earth.com/image/intense-fire-season-in-mexico-is-part-of-a-worldwide-trend/" target="_blank" rel="noreferrer noopener">Fire activity</a> continues to increase through March and April, reaches a peak during the height of the dry season, and then fades in May with the start of the rainy season," noted <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA</a>.</p>



<p>"Individual fires are usually small and short-lived. But they are often so numerous that smoke, along with air pollution from rural and urban areas, mixes to produce thick layers of haze that blanket the landscape." </p>



<p>According to NASA, the haze contains mixtures of small airborne particles called aerosols and gaseous pollutants such as nitrogen dioxide, sulfur dioxide, carbon monoxide, and ozone that degrade air quality.</p>



<h2 class="wp-block-heading" id="h-haze-in-thailand-nbsp">Haze in Thailand&nbsp;</h2>



<p>An international field campaign - the Airborne and Satellite Investigation of Asian Air Quality (ASIA-AQ) - was launched to investigate the haze in Thailand.</p>



<p>"During the last two weeks of March 2024, NASA’s DC-8 and Gulfstream III aircraft flew several flights over Chiang Mai, Bangkok, and rural areas surrounding the cities to sample air quality with several sensors. At the same time, satellites observed the haze from above," said NASA.</p>



<p>James Crawford, ASIA-AQ’s principal investigator, said the team is collaborating closely with national and local government entities in Thailand.</p>



<p>“The goal is to take as many simultaneous measurements of pollutants as possible from the ground, air, and space,” said Crawford. The team will use the data to gain a better understanding of how the haze forms, evolves chemically over time, and moves throughout the region.</p>



<h2 class="wp-block-heading" id="h-haze-and-public-health-in-thailand">Haze and public health in Thailand </h2>



<p>According to media reports, nearly 200,000 people have been hospitalized this year due to air quality in the region, with over 1.3 million people falling ill since January.&nbsp;</p>



<h3 class="wp-block-heading" id="h-causes-of-the-haze">Causes of the haze</h3>



<p>The root causes of the haze include agricultural burning, particularly of corn fields, as part of slash-and-burn practices to prepare land for the next planting cycle. This is exacerbated by the dry season when there's little rain to wash the pollutants away. </p>



<p>The situation is worsened by industrial emissions and vehicle fumes, particularly in urban areas like Bangkok​.</p>



<h3 class="wp-block-heading" id="h-sustainable-solutions-are-needed">Sustainable solutions are needed</h3>



<p>Efforts to address the crisis have been complex, involving local and transboundary issues. Much of the agricultural burning occurs not only within Thailand but also in neighboring countries like Myanmar and Laos, contributing to the transboundary nature of the haze. </p>



<p>Activists and local communities have called for sustainable solutions that do not exacerbate the poverty of smallholder farmers, emphasizing the need for affordable and realistic alternatives to burning​.</p>



<h3 class="wp-block-heading" id="h-mitigation-measures-nbsp">Mitigation measures&nbsp;</h3>



<p>The Thai government has implemented a no-burning rule until the end of April to combat wildfires and haze, but enforcement and effectiveness remain challenges​​. </p>



<p>Some measures taken to mitigate the immediate effects of pollution in urban areas include spraying water and seeding clouds to encourage rain, although these have had limited success​​.</p>



<p>This ongoing environmental crisis has sparked widespread concern among citizens, who are increasingly using public interest litigation to hold companies and the government accountable for environmental commitments. </p>



<p>With recent political changes, there is hope that the new administration will take more decisive action against the haze, possibly through more stringent regulations and international cooperation​​.</p>



<h2 class="wp-block-heading" id="h-health-impacts-of-haze">Health impacts of haze</h2>



<p>Haze poses several health hazards for those exposed to it, particularly when it contains fine particulate matter (PM2.5). Here are some of the main health risks associated with exposure to haze:</p>



<h3 class="wp-block-heading" id="h-respiratory-problems">Respiratory problems</h3>



<p>Haze can aggravate conditions such as asthma, bronchitis, and other chronic obstructive pulmonary diseases (COPD). The fine <a href="https://www.earth.com/news/heatwaves-and-air-pollution-may-double-fatal-heart-attack-risk/">particles</a> can penetrate deep into the lungs, causing inflammation and reducing lung function.</p>



<h3 class="wp-block-heading" id="h-cardiovascular-issues-and-haze">Cardiovascular issues and haze</h3>



<p>Exposure to fine particulate matter can also affect the cardiovascular system, leading to increased risk of heart attacks, strokes, and high blood pressure. Particles can affect blood vessel function and promote the formation of blood clots.</p>



<h3 class="wp-block-heading" id="h-eye-irritation">Eye irritation</h3>



<p>Haze can cause eye irritation, leading to conditions such as conjunctivitis (pink eye) or exacerbated symptoms in people with existing eye conditions.</p>



<h3 class="wp-block-heading" id="h-skin-problems">Skin problems</h3>



<p>For some people, exposure to <a href="https://www.earth.com/news/air-pollution-will-increase-dramatically-in-a-hotter-climate/">polluted air</a> can cause skin irritation or exacerbate skin conditions like eczema or psoriasis.</p>



<h3 class="wp-block-heading" id="h-reduced-immune-function">Reduced immune function</h3>



<p>There is evidence to suggest that prolonged exposure to polluted air can weaken the immune system, making individuals more susceptible to infections.</p>



<h3 class="wp-block-heading" id="h-impact-on-mental-health">Impact on mental health</h3>



<p>There are growing concerns about the impact of air pollution on <a href="https://www.earth.com/news/air-pollution-linked-to-multiple-chronic-health-conditions/">mental health</a>, with studies suggesting a link between exposure to polluted air and an increased risk of depression and anxiety.</p>



<h3 class="wp-block-heading" id="h-pregnant-women-and-children">Pregnant women and children</h3>



<p>Pregnant women, children, and the elderly are particularly vulnerable to the effects of haze. There may be increased risks of preterm birth and low birth weight in babies, and children may experience delayed development and reduced lung function.</p>



<p>The health impacts of haze can be mitigated by staying indoors on days when <a href="https://www.earth.com/news/twenty-years-of-air-quality-improvement-erased-by-wildfires/" target="_blank" rel="noreferrer noopener">air quality</a> is particularly poor, using air purifiers, wearing masks designed to filter out fine particles, and following local health advisories.</p>



<p>Image Credit: NASA Earth Observatory</p>



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

Haze pollution is an environmental crisis in Thailand

<p>Today's <strong>Image of the Day</strong> from NASA Webb Images features an extraordinary view of Uranus, the seventh planet from the sun in our solar system.&nbsp;</p>



<p>The photo reveals the rings, moons, and extreme seasons of the ice giant Uranus in unprecedented detail.&nbsp;</p>



<h2 class="wp-block-heading" id="h-dynamic-north-polar-cap-nbsp">Dynamic north polar cap&nbsp;</h2>



<p>“The Webb image exquisitely captures Uranus’s seasonal north polar cap, including the bright, white, inner cap and the dark lane in the bottom of the polar cap,” noted NASA.</p>



<p>Unlike Earth, where polar ice caps are formed by the freezing of water, Uranus's polar caps are thought to be primarily composed of a dense concentration of haze in the atmosphere.&nbsp;</p>



<p>The polar cap's haze is likely composed of methane particles. Methane in Uranus's atmosphere condenses into ice particles, which then create a thick haze that scatters sunlight, giving the polar cap its distinct bright appearance in visible and infrared light.</p>



<p>The polar cap is dynamic and changes over time. It becomes more prominent during the summer season of each pole. </p>



<p>As Uranus moves along its orbit, the cap's appearance transforms, with the haze becoming thicker and brighter when the pole is in continuous sunlight.</p>



<h2 class="wp-block-heading" id="h-the-zeta-ring-nbsp">The Zeta ring&nbsp;</h2>



<p>The inner and outer rings of Uranus are visible in the image, including Zeta - the innermost ring which is the faintest and most difficult to observe.</p>



<p>The <a href="https://www.earth.com/news/stunning-photo-of-uranus-and-its-rings-and-moons-captured-by-the-webb-telescope/" target="_blank" rel="noreferrer noopener">rings of Uranus</a> are primarily composed of narrow bands of particles, likely made of water ice mixed with a dark material. These rings are distinct from those of Saturn in that they are much darker and narrower.</p>



<p>The faintness and characteristics of the Zeta ring make it a subject of interest in studies related to the dynamics and composition of planetary ring systems.</p>



<h2 class="wp-block-heading" id="h-moons-of-uranus-nbsp">Moons of Uranus&nbsp;</h2>



<p>The <a href="https://science.nasa.gov/mission/webb/multimedia/images/" target="_blank" rel="noreferrer noopener">Webb</a> photo also features nine of the planet’s <a href="https://www.earth.com/news/nasa-four-uranus-moons-may-have-oceans-that-are-miles-deep/" target="_blank" rel="noreferrer noopener">moons</a>, which appear as blue dots surrounding the rings.&nbsp;</p>



<p>“Clockwise starting at 2 o’clock, they are: Rosalind, Puck, Belinda, Desdemona, Cressida, Bianca, Portia, Juliet, and Perdita. The orbits of these moons share the 98-degree tilt of their parent planet relative to the plane of the solar system,” noted NASA.</p>



<p>Uranus has 27 known moons, and they are divided into three main groups based on their orbits: the inner moons, the major moons, and the irregular moons.</p>



<p>The <a href="https://www.earth.com/news/uranus-moon-ariel-may-have-a-hidden-ocean/" target="_blank" rel="noreferrer noopener">moons</a> of Uranus are unique because they are named after characters from the works of William Shakespeare and Alexander Pope, rather than being named after figures from classical mythology, as is common for the moons of other planets.</p>



<h2 class="wp-block-heading" id="h-the-ice-giant-uranus-nbsp">The ice giant Uranus&nbsp;</h2>



<p>Uranus is classified as an "ice giant" because, unlike the gas giants Jupiter and Saturn, which are primarily composed of hydrogen and helium, Uranus has a significant proportion of "ices" in its composition.&nbsp;</p>



<p>In astronomical terms, ices refer to volatile substances like water, ammonia, and methane, which exist in solid or liquid forms at the low temperatures found in the outer solar system.</p>



<p>Uranus has a thick atmosphere of hydrogen and helium, but beneath that, it contains a large, dense mantle composed of these ices, along with rock and other heavier elements.&nbsp;</p>



<p>The term <a href="https://www.earth.com/news/diamond-rain-may-be-common-on-giant-icy-planets/" target="_blank" rel="noreferrer noopener">ice giant</a> differentiates Uranus (and Neptune, the other ice giant) from the larger gas giants, emphasizing the different chemical compositions and internal structures of these planets.</p>



<h2 class="wp-block-heading" id="h-climate-of-uranus-nbsp">Climate of Uranus&nbsp;</h2>



<p>Uranus has a unique and extreme climate, largely influenced by its unusual tilt, which causes the planet to rotate almost on its side. This tilt leads to extreme seasonal variations, with each pole experiencing 42 years of continuous sunlight followed by 42 years of darkness.&nbsp;</p>



<p>Even though it is closer to the sun than Neptune, Uranus is the coldest planet in the solar system, with temperatures plunging to as low as -224°C (-371°F). The reason for this is not fully understood, but it might be due to an internal heat distribution anomaly.</p>



<p>Despite these frigid conditions, Uranus experiences intense weather patterns, including powerful storms and winds that can reach speeds of up to 900 kilometers per hour. These winds blow in the same direction as the planet’s rotation and are some of the fastest in the solar system.</p>



<p>Storms on Uranus are driven by its internal heat and the interaction of its <a href="https://www.earth.com/news/uranus-is-more-gassy-less-icy-than-we-ever-imagined/" target="_blank" rel="noreferrer noopener">atmospheric gases</a>. Observations have shown that these storms can be quite large, sometimes comparable in size to the Earth, and can last for several years.&nbsp;</p>



<p>The planet’s extreme axial tilt also means that the storms and weather patterns are highly variable, depending on the season. During equinoxes, when the Sun is directly over the equator, Uranus exhibits more storm activity compared to when the poles are pointed towards the Sun or away from it.</p>



<h2 class="wp-block-heading" id="h-observations-of-uranus">Observations of Uranus</h2>



<p>“One day on Uranus is about 17 hours, so the planet’s rotation is relatively quick. This makes it supremely difficult for observatories with a sharp eye like Webb to capture one simple image of the entire planet - storms and other atmospheric features, and the planet’s moons, move visibly within minutes,” explained NASA.</p>



<p>“This image combines several longer and shorter exposures of this dynamic system to correct for those slight changes throughout the observing time.”</p>



<p>The first recorded observations of Uranus were made by John Flamsteed on December 13, 1690. However, Flamsteed mistakenly identified the planet as a star, which he named “34 Tauri."&nbsp;</p>



<p>It wasn't until March 13, 1781, that Uranus was officially identified as a planet by William Herschel. He initially thought he had discovered a comet, but further observations and calculations by other astronomers confirmed that it was a new planet, making Uranus the first planet discovered in modern history with the aid of a telescope.</p>



<p>Image Credit: NASA, ESA, CSA, STScI</p>



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The ice giant Uranus in stunning detail

Today's Image of the Day from NASA Webb Images features...

<p>Today's Image of the Day from NASA Earth Observatory features a strong extratropical cyclone, which struck the Pacific Northwest on November 19, 2024.</p>



<p>“The storm knocked over trees and left nearly 600,000 people without power in Washington state on November 20, according to news reports,” noted <a href="https://search.app?link=https%3A%2F%2Fearthobservatory.nasa.gov%2Fimages%2F153605%2Fextratropical-cyclone-whips-over-the-pacific-northwest&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">NASA</a>. “This image shows the storm system at 1:50 p.m. Pacific Time on November 19.” </p>



<p>According to NASA, mature extratropical cyclones like this often feature comma-shaped cloud patterns that are the product of ‘conveyor belt’ circulation. “Heavy precipitation is often present near the low-pressure head of the comma.”</p>



<h2 class="wp-block-heading" id="h-impacts-of-the-extratropical-cyclone-nbsp">Impacts of the extratropical cyclone&nbsp;</h2>



<p>The “bomb cyclone” brought <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fhow-much-does-climate-change-influence-extreme-weather-events%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">severe weather</a>, including strong winds exceeding 70 mph, heavy rainfall, and snow in higher elevations. These conditions led to significant disruptions, including downed trees and hazardous travel conditions.</p>



<p>In urban and rural areas, damage to infrastructure and properties was substantial, with emergency responders and utility crews working around the clock to restore services.&nbsp;</p>



<p>Additionally, mountain passes faced dangerous blizzard conditions, with up to 20 inches of snow accumulating in some areas, severely affecting travel.</p>



<h2 class="wp-block-heading" id="h-rapid-pace-of-acceleration">Rapid pace of acceleration</h2>



<p>Chris Dolce is a meteorologist at The Weather Channel. He noted that on the evening of November 19, the storm’s central pressure dropped to levels on par with a storm in October 2021, which saw the lowest pressure in about 50 years of records for that region.</p>



<p>“The pace of the storm’s intensification was more than double the criteria for bombogenesis - a popular term that describes a midlatitude cyclone that rapidly intensifies into a ‘bomb cyclone,’” said NASA.</p>



<p>The rapidly dropping atmospheric pressure at the center of the <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fcoastal-hurricanes-are-intensifying-faster-due-to-climate-change%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">storm</a> caused winds to intensify quickly. According to the National Weather Service in Seattle, wind gusts reached up to 77 miles per hour in the mountains southeast of the city.</p>



<p>“The cyclone kicked off a long-duration atmospheric river that forecasters expect will park over Northern California and southern Oregon through November 22. The National Weather Service estimates that these areas could see rainfall totals of 12 to 16 inches over the duration of the storm,” noted NASA.</p>



<h2 class="wp-block-heading" id="h-what-is-an-extratropical-cyclone">What is an extratropical cyclone?</h2>



<p>An extratropical cyclone is a large-scale weather system that forms outside the tropics, typically between 30° and 60° latitude, and is associated with areas of low pressure.&nbsp;</p>



<h3 class="wp-block-heading" id="h-energy-source">Energy source</h3>



<p>These cyclones obtain their energy from the contrast in temperature between air masses, such as cold polar air and warm subtropical air. This contrast creates instability and drives atmospheric circulation.</p>



<h3 class="wp-block-heading" id="h-development-of-extratropical-cyclones-nbsp">Development of extratropical cyclones&nbsp;</h3>



<p>Extratropical cyclones usually have well-defined warm and cold fronts. They often develop along the polar front, where cold and warm air masses meet.</p>



<p>A common area for their development is the mid-latitudes, particularly in regions like the North Atlantic and North Pacific.</p>



<h3 class="wp-block-heading" id="h-weather-conditions">Weather conditions</h3>



<p>Extratropical cyclones can bring a variety of <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fhuman-activity-is-rapidly-changing-weather-in-north-america%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">weather conditions</a>, including heavy rain, snow, strong winds, and severe storms. They are responsible for much of the day-to-day weather in mid-latitude regions.</p>



<h3 class="wp-block-heading" id="h-tropical-vs-extratropical-cyclones-nbsp">Tropical vs. extratropical cyclones&nbsp;</h3>



<p>While <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Ffast-moving-tropical-cyclones-are-becoming-more-powerful%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">tropical cyclones</a> derive energy from warm ocean waters and have a warm core, extratropical cyclones gain energy from temperature contrasts and have a cold core.</p>



<p>Tropical cyclones typically lack fronts, whereas extratropical cyclones are defined by them.</p>



<p>These systems are essential in distributing heat and energy across the planet, playing a critical role in the Earth's climate system.</p>



<h2 class="wp-block-heading" id="h-caught-off-guard-by-the-weather">Caught off guard by the weather</h2>



<p>The bomb cyclone in the Pacific Northwest highlights the importance of <a href="https://search.app?link=https%3A%2F%2Fwww.earth.com%2Fnews%2Fnew-era-in-forecasting-ai-will-improve-extreme-weather-warnings%2F&amp;utm_campaign=aga&amp;utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4" target="_blank" rel="noreferrer noopener">preparedness</a>, as residents were urged to secure loose outdoor items, stock emergency supplies, and avoid unnecessary travel.</p>



<p>The fire department in Bellevue, east of Seattle, posted a Severe Weather Safety alert on Facebook: “It’s severe out there. Trees are coming down all over the city, with multiple falling onto homes. If you are able, head to the lowest floor you can and stay away from windows. Do not go outside if you can avoid it.”</p>



<p>The image was captured by the VIIRS (Visible Infrared Imaging Radiometer Suite) on NOAA’s JPSS-1 (Joint Polar Satellite System-1).</p>



<p>Image Credit: NASA Earth Observatory</p>



<p>-----</p>



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Bomb cyclone rapidly intensified in the Pacific Northwest

<p>The next time you clean out your closet and happily donate old clothes to charity, you might want to pause for a moment. A novel study, published in the journal <em>Nature Cities</em>, has brought to light some shocking revelations about the destiny of our donated garments.</p>



<h2 class="wp-block-heading" id="h-unfortunate-fate-of-donated-clothes">Unfortunate fate of donated clothes</h2>



<p>Researchers have been diligently following the trail of donated clothes and textiles across several western cities. </p>



<p>The findings are quite disturbing. In most cities, spanning from Melbourne to Manchester, donated <a href="https://www.earth.com/news/fashion-industrys-plastic-waste-is-a-major-environmental-threat/" target="_blank" rel="noreferrer noopener">textiles</a> are either exported or dumped as waste.</p>



<p>It's alarming to consider that the weight of global textile waste each year is 92 million tonnes, a number that could see a scary doubling by 2030.</p>



<h2 class="wp-block-heading" id="h-crucial-role-of-charity-shops">Crucial role of charity shops</h2>



<p>Charity shops do an admirable job of handling a large volume of used and donated clothes. However, they face a <a href="https://www.earth.com/news/fast-fashion-toll-environment/" target="_blank" rel="noreferrer noopener">complex predicament</a>. </p>



<p>Quite a few of the donations they receive are of poor quality, reducing the financial benefit of managing them locally. So, how do these charities adapt? They trade valuable items and discard or export the remainder.</p>



<p>An interesting case in point is Melbourne, where charities export high-quality, often vintage, second-hand clothes to Europe. This results in the city's independent resale businesses importing similar clothing back from Europe or the United States.</p>



<h2 class="wp-block-heading" id="h-challenges-of-high-volume-and-low-quality">Challenges of high volume and low quality</h2>



<p>Over the past 15 to 20 years, charities and collectors have reported a concerning decrease in the quality of the garments they receive, which negatively impacts their resale potential.</p>



<p>According to Dr. Yassie Samie of <a href="https://www.rmit.edu.au" target="_blank" rel="noreferrer noopener">RMIT University</a> in Melbourne, local governments and charities need a stronger and more efficient collaboration to manage textile waste.</p>



<p>"We're used to charities doing the heavy lifting, but they've been unable to fully handle the volume of donated clothes for a long time now," said Dr. Samie.</p>



<p>"Charities are driven by social welfare values and need to raise funds for their programs. However, their operations are ill-equipped to deal with the volume of used textiles that need to be reused and recycled."</p>



<p>Local government cooperation is essential in this regard, and Samie suggests that charities explore other business models, such as swapping and repair centers.</p>



<h2 class="wp-block-heading" id="h-export-of-donated-clothes">Export of donated clothes</h2>



<p>Overconsumption and oversupply are the main culprits behind the cities' textile waste crisis. These lead to the export of between 33% (Australia) and 97% (Norway) of donated clothes.</p>



<p>It's important to note that most local governments in the cities studied do not get involved in textile waste beyond providing public spaces and licenses for charity bins and commercial resellers. </p>



<p>In fact, in cities like Melbourne, local governments send discarded textiles directly to landfill, instead of diverting them to recycling or reuse facilities, or other employing other, local alternatives.</p>



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



<p>Dr. Samie noted that systemic change is vital to address the issue of textile waste. She emphasizes the importance of promoting local <a href="https://www.earth.com/news/eco-friendly-vegan-leather-could-transform-the-fashion-industry/" target="_blank" rel="noreferrer noopener">alternatives</a> to fast fashion, including reselling, swapping, and repairing.</p>



<p>"Sustainable fashion initiatives, like second-hand retailers, struggle to compete with fashion brands' big marketing budgets and convenient locations," said Dr. Samie.</p>



<p>"Fast fashion alternatives exist but they are under-promoted, despite their potential to significantly reduce cities' textile waste."</p>



<h2 class="wp-block-heading" id="h-hidden-cost-of-donated-clothes">Hidden cost of donated clothes</h2>



<p>The exportation of donated clothes presents another layer of complexity in the textile waste conundrum. </p>



<p>While sending garments abroad might appear as a practical solution for local waste management challenges, it offloads the environmental and social costs onto less-regulated markets.</p>



<p>These exported textiles often end up in countries with weak waste management infrastructures, where they can accumulate in landfills, contributing to pollution and resource strain. </p>



<p>Moreover, the influx of cheap, second-hand clothing can undermine local textile industries, impacting the livelihoods of workers who depend on traditional garment production.</p>



<p>Relying on exports as an easy fix not only perpetuates global inequalities but also stalls the necessary advancements in sustainable local solutions.</p>



<h2 class="wp-block-heading" id="h-approaches-to-mitigating-waste">Approaches to mitigating waste</h2>



<p>Transformative approaches to addressing textile waste are beginning to emerge, albeit at varying scales of impact. </p>



<p>Some forward-thinking cities and organizations have started to implement circular economy strategies, focusing on keeping resources in use for as long as possible through upcycling, recycling, and the utilization of biodegradable materials. </p>



<p>Collaborations between fashion brands, municipalities, and environmental organizations have led to the establishment of community repair cafes and textile recycling hubs. These initiatives not only reduce waste but also educate the public on the value of sustainable practices. </p>



<p>A multi-faceted approach incorporating education, policy change, and grassroots involvement is critical for creating lasting change. By promoting a culture of sustainability, cities can turn the tide on textile waste and lead the way towards a more environmentally responsible future.</p>



<h2 class="wp-block-heading" id="h-fashion-advertising-ban">Fashion advertising ban</h2>



<p>The study's authors propose a ban on <a href="https://www.earth.com/news/fast-fashion-carbon-footprint/" target="_blank" rel="noreferrer noopener">fashion</a> advertising in cities to make room for promoting more sustainable alternatives to donating clothes. </p>



<p>Recently, France introduced a ban on advertising ultra-fast fashion. Dr. Samie supports such regulations and would like to collaborate with local governments to find better uses for discarded textiles.</p>



<p>Ultimately, the study sheds light on the urgent need for smarter methods of managing textile waste.</p>



<p>As the global textile waste burden continues to grow, each one of us must take responsibility for our shopping habits and make more sustainable choices. </p>



<p>The study is published in the journal <em><a href="https://www.nature.com/articles/s44284-024-00140-7" target="_blank" rel="noreferrer noopener">Nature Cities</a></em>.</p>



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The dark side of donating clothes to charity

The next time you clean out your closet and happily...

<p>Ever wondered what keeps your skin from turning crispy under the fiery sun? Well it's thanks to urocanic acid, a compound that could replace synthetic sunscreens.</p>



<p>Recently, a team of researchers shed light on this naturally occurring UV-absorbing compound. </p>



<p>Known as "sunscreen's potential game-changer," urocanic acid offers an eco-friendly and health-conscious alternative to synthetic sunscreens.</p>



<h2 class="wp-block-heading" id="h-urocanic-acid-as-sunscreen">Urocanic acid as sunscreen</h2>



<p>The study was led by Professor Wybren Jan Buma of the <a href="https://www.uva.nl/en" target="_blank" rel="noreferrer noopener">University of Amsterdam</a> and Professor Vasilios Stavros of the <a href="https://warwick.ac.uk" target="_blank" rel="noreferrer noopener">University of Warwick</a> in the U.K. </p>



<p>Together with their research teams, they’ve been digging deep into urocanic acid's <a href="https://www.earth.com/news/why-does-skin-become-leathery-after-too-much-uv-light-from-sun-exposure/" target="_blank" rel="noreferrer noopener">capabilities</a>, investigating its possible use as a novel class of sunscreen filters.</p>



<h2 class="wp-block-heading" id="h-properties-of-urocanic-acid">Properties of urocanic acid</h2>



<p>The investigations were focused on the UV-A and UV-B absorbing, or "sun-blocking" properties of urocanic acid and its <a href="https://www.earth.com/news/forever-chemicals-are-easily-absorbed-through-skin/" target="_blank" rel="noreferrer noopener">derivatives</a>.</p>



<p>The experts scrutinized the properties of isolated molecules and solutions, and their findings have been published in two enlightening papers in the journal <em>Physical Chemistry Chemical Physics</em> (PCCP).</p>



<p>"This is an excellent starting point for further optimization of its photoactive properties," said Professor Buma. "We envision many specific applications of urocanic acid and its derivatives, notably in safe UV filters."</p>



<h2 class="wp-block-heading" id="h-need-for-safer-sunscreen-agents">Need for safer sunscreen agents</h2>



<p>Recent debates have cast a shadow over synthetic sunscreen filters. Concerns have arisen regarding their potential adverse effects on health and the environment. Could nature’s own sunscreen, urocanic acid, be the answer?</p>



<p>Urocanic acid, as a naturally occurring sunscreen in our <a href="https://www.earth.com/news/skins-secret-strength-shields-against-puncture-damage/" target="_blank" rel="noreferrer noopener">skin</a>, absorbs both UV–A and UV–B radiation. However, its sun protection factor (SPF) is a mere 1.58, which is significantly less effective than synthetic sunscreens. </p>



<p>Another issue is that urocanic acid can convert into an immunosuppressive molecular variant when exposed to UV radiation.</p>



<p>"You might think that all this makes urocanic acid not fit for use in a sunscreen," said Professor Buma.</p>



<p>"But it is definitely worth investigating. We think it is possible to design effective urocanic acid-based biomimetic sunscreens with a more favorable toxicological profile and optimize their photochemical and photophysical characteristics."</p>



<h2 class="wp-block-heading" id="h-revolutionary-sunscreen-urocanic-acid">Revolutionary sunscreen: Urocanic acid</h2>



<p>By cobbling together high-resolution laser spectroscopy of isolated molecules and quantum chemical calculations, Buma and his team achieved a fundamental understanding of how urocanic acid interacts with UV light.</p>



<p>The team noted that previous studies had inadvertently obtained data from decomposition products rather than actual urocanic acid molecules. This new realization has reshaped the field.</p>



<p>The knowledge gained from the team's research has opened up new avenues for optimizing potential sunscreen formulations based on urocanic acid derivatives. They've also identified stable derivatives that could potentially reduce the immunosuppressive effects of 'plain' urocanic acid.</p>



<h2 class="wp-block-heading" id="h-potential-environmental-benefits">Potential environmental benefits</h2>



<p>One notable advantage of exploring urocanic acid as a sunscreen filter is its potential to mitigate the environmental concerns associated with synthetic sunscreens. </p>



<p>Traditional sunscreens often wash off in water, harming marine life and contributing to coral reef degradation. Since urocanic acid is a natural compound, it presents a more environmentally-friendly alternative. </p>



<p>Further research is needed to assess the ecological impact fully, but initial findings suggest that formulations based on urocanic acid could provide effective sun protection while minimizing harm to aquatic ecosystems.</p>



<h2 class="wp-block-heading" id="h-future-of-sunscreen-innovation">Future of sunscreen innovation</h2>



<p>As contemporary sunscreen research progresses, the promising properties of urocanic acid continue to capture the scientific community's imagination. </p>



<p>By harnessing advanced photochemistry and materials science, researchers like Buma and Stavros aim to develop next-generation sunscreen formulations that combine safety, efficacy, and environmental consciousness. </p>



<p>In a future where sun protection aligns with sustainability, urocanic acid stands poised to redefine how we shield ourselves from the <a href="https://www.earth.com/news/sunscreen-gives-us-a-false-sense-of-security/" target="_blank" rel="noreferrer noopener">sun’s harmful rays</a>. </p>



<p>As this research moves forward, collaborations across scientific fields will be essential in transforming these theoretical advantages into practical, widely available applications.</p>



<h2 class="wp-block-heading" id="h-urocanic-acid-as-a-natural-sunscreen">Urocanic acid as a natural sunscreen</h2>



<p>This revolutionary work has sparked renewed interest in this class of molecules. </p>



<p>"This could ultimately lead to novel sunscreen filters, but also to novel applications in areas where photothermal materials are employed," said Professor Buma.</p>



<p>Only time will tell what the future holds for urocanic acid and its potential uses.</p>



<p>The study is published in the journal <em><a href="https://pubs.rsc.org/en/content/articlelanding/2024/cp/d4cp02088j" target="_blank" rel="noreferrer noopener">Physical Chemistry Chemical Physics</a></em>.</p>



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Common acid in our skin could be a natural sunscreen

Ever wondered what keeps your skin from turning crispy under...

<p>For decades, astronomers have puzzled over the intense heat and persistence of the fiery hot gas surrounding the Milky Way.&nbsp;</p>



<p>New research by scientists from the <a href="https://www.rri.res.in/" target="_blank" rel="noreferrer noopener">Raman Research Institute</a> (RRI), <a href="https://iitpkd.ac.in/" target="_blank" rel="noreferrer noopener">IIT-Palakkad</a>, and <a href="https://www.osu.edu/" target="_blank" rel="noreferrer noopener">Ohio State University</a> sheds light on this mystery. The team has proposed a model to identify the sources responsible for heating and maintaining this extraordinary phenomenon.</p>



<h2 class="wp-block-heading" id="h-the-milky-way-s-hidden-gas-reservoir">The Milky Way’s hidden gas reservoir</h2>



<p>The <a href="https://www.earth.com/news/milky-way-like-galaxies-were-present-in-the-early-universe/" target="_blank" rel="noreferrer noopener">Milky Way</a> contains more <a href="https://www.earth.com/news/mechanism-discovered-that-creates-the-gas-disks-around-black-holes/" target="_blank" rel="noreferrer noopener">gas</a> than stars, and this gas plays a crucial role in sustaining star formation. This massive gas reserve has enabled the galaxy to continue forming stars over billions of years.&nbsp;</p>



<p>However, the gas is so tenuous that it has long eluded observation, making it difficult for astronomers to measure its true volume.</p>



<p>In the past few decades, scientists confirmed the existence of a vast sphere of hot gas enveloping the Milky Way. This gas extends up to 700,000 light-years and reaches temperatures of several million degrees Kelvin.&nbsp;</p>



<p>Researchers initially attributed its high temperature to the galaxy’s gravitational forces. The gas swirls constantly, preventing it from falling inward under the pull of gravity.</p>



<h2 class="wp-block-heading" id="h-the-discovery-of-even-hotter-gas">The discovery of even hotter gas</h2>



<p>Recent observations revealed something even more astonishing: a hotter layer of gas surrounding the Milky Way.&nbsp;</p>



<p>This gas, estimated to be around 10 million degrees Kelvin, was identified through faint X-ray emissions detected in all directions. The same gas also appeared as an absorbing medium in the spectra of three distant <a href="https://www.earth.com/news/early-quasars-defied-the-laws-of-physics-with-rapid-growth/" target="_blank" rel="noreferrer noopener">quasars</a>.</p>



<p>This discovery posed new questions: What was causing this gas to reach such extreme temperatures, and how was it being sustained? These findings sparked a surge of research aimed at identifying the mysterious heat sources.</p>



<h2 class="wp-block-heading" id="h-supernovae-the-engines-heating-the-milky-way">Supernovae: The engines heating the Milky Way</h2>



<p>The new model proposed by RRI and its collaborators provides a detailed explanation for the heating mechanism.&nbsp;</p>



<p>The research shows that the X-ray-emitting gas and the absorbing gas are not the same. Instead, the X-ray-emitting gas originates from a puffed-up region surrounding the Milky Way’s stellar disk.</p>



<p>This region is created by the ongoing star formation within the Milky Way. Massive stars in these star-forming regions eventually explode as <a href="https://www.earth.com/news/supernova-explosions-could-damage-distant-planets/" target="_blank" rel="noreferrer noopener">supernovae</a>, releasing vast amounts of energy. These explosions heat the surrounding gas to extreme temperatures.</p>



<p>“Explosions keep heating up the gas floating around the disk of the Milky Way, and they enrich the gaseous matter with elements synthesized within massive stars,” explained Mukesh Singh Bisht, a PhD student at RRI.</p>



<p>The turbulent gas, propelled by supernovae, either escapes into the surrounding medium or cools and falls back onto the disk. This process sustains the hot gas layer observed in X-rays.</p>



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



<p>The absorbing hot gas also provided critical insights into its origins. Researchers found that it was enriched with α-elements such as sulfur, magnesium, and neon.&nbsp;</p>



<p>These elements, whose nuclei are multiples of helium nuclei, are produced through nuclear reactions within massive stars. They are expelled into space during supernova explosions.</p>



<p>“This fiery gas, at least in a few directions, seems to be enriched with large quantities of α-elements. This is a vital clue of nuclear reactions occurring within the stellar core,” said Biman Nath, an RRI faculty member and co-author of the studies.</p>



<p>Runaway stars - stars ejected from the Milky Way’s disk - also play a role in this process. When these stars explode as supernovae above the disk, they create pockets of α-enriched gas.</p>



<h2 class="wp-block-heading" id="h-explaining-the-observed-signals">Explaining the observed signals</h2>



<p>The researchers found that the absorbing gas interacts with light from distant sources, such as quasars. When aligned with these light sources, the gas absorbs specific wavelengths, creating shadow signals that match observations.</p>



<p>Meanwhile, the X-ray-emitting gas forms a veil around the stellar disk, produced by the continuous star formation and supernova activity within the Milky Way.</p>



<p>“A veil of fiery hot gas keeps engulfing the Milky Way disk as a result of the star-forming activities in the stellar disk,” Bisht added .</p>



<p>This dual mechanism explains both the absorbing and emitting signals detected by astronomers, offering a comprehensive understanding of the dynamics within our galaxy.</p>



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



<p>The faint X-ray signals emitted by the hot gas offer valuable opportunities for further study. The research team plans to test their models at other frequencies, hoping to gather more clues about the composition and behavior of the gas.</p>



<p>Their work also raises questions about how these processes affect the larger-scale evolution of the Milky Way. Understanding the interplay between star formation, supernovae, and the surrounding gaseous envelope could provide insights into the life cycles of galaxies.</p>



<p>This research not only solves a long-standing mystery but also highlights the importance of gas dynamics in shaping the Milky Way. The interplay between supernovae and the surrounding gas regulates the galaxy’s star formation and energy distribution.</p>



<p>The enriched gas observed in the study also points to the ongoing recycling of materials within the galaxy, where elements created in stellar cores are redistributed through explosions, fueling new generations of stars.</p>



<h2 class="wp-block-heading" id="h-sources-of-the-milky-way-s-fiery-gas">Sources of the Milky Way’s fiery gas</h2>



<p>The new model proposed by RRI and its collaborators sheds light on the sources of the fiery hot gas surrounding the Milky Way, offering answers to a decades-old mystery.&nbsp;</p>



<p>By identifying supernovae as the primary heat engines, the study reveals the complex interplay between star formation, explosions, and gas dynamics that sustain the <a href="https://www.earth.com/news/massive-galactic-explosion-provides-clues-about-galaxy-evolution/" target="_blank" rel="noreferrer noopener">galaxy’s evolution</a>.</p>



<p>With future research planned to explore these phenomena further, scientists are poised to gain even deeper insights into the processes that shape our galaxy and others like it.</p>



<p>The findings are <a href="https://iopscience.iop.org/article/10.3847/1538-4357/ad77c0" target="_blank" rel="noreferrer noopener">published</a> in two studies in <a href="https://iopscience.iop.org/article/10.3847/1538-4357/ad77be" target="_blank" rel="noreferrer noopener"><em>The Astrophysical Journal</em></a><em>.</em></p>



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Fiery gas surrounds the Milky Way, but what is heating it?

For decades, astronomers have puzzled over the intense heat and...

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<p><br />
<span style="font-weight: 400;">Today&#8217;s </span><b>Video of the Day </b><span style="font-weight: 400;">from the </span><a href="https://eros.usgs.gov/image-gallery/image-of-the-week"><span style="font-weight: 400;">USGS</span></a><span style="font-weight: 400;"> shows how one of the worst natural disasters in history reshaped the coast of Sumatra, Indonesia. </span></p>
<p><span style="font-weight: 400;">In December of 2004, an earthquake off the coast of northern Sumatra was so intense that it lifted the seafloor several meters and sent tsunami waves in every direction. The 9.1-magnitude Indian Ocean Earthquake ranks as the third must powerful on record. </span></p>
<p><span style="font-weight: 400;">Waves that reached the coast of Sumatra were as high as 30 meters. Landsat images show where the vegetation was completely stripped away along the coast, as well as the recovery in the years that followed. </span></p>
<p><span style="font-weight: 400;">V</span><i><span style="font-weight: 400;">ideo Credit: USGS</span></i></p>
<p><span style="font-weight: 400;">&#8211;</span><span style="font-weight: 400;">&#8212;</span></p>
<p><i><span style="font-weight: 400;">By </span></i><a href="http://csexton@earth.com"><i><span style="font-weight: 400;">Chrissy Sexton</span></i></a><i><span style="font-weight: 400;">, </span></i><a href="https://www.earth.com/staff/"><i><span style="font-weight: 400;">Earth.com</span></i></a><i><span style="font-weight: 400;"> Staff Writer</span></i></p>

Indian Ocean tsunami reshaped the coast of Sumatra