<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>



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Bomb cyclone rapidly intensified in the Pacific Northwest

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

<p>Today's <strong>Image of the Day</strong> from the European Space Agency features the barred spiral galaxy NGC 1559, located around 35 million light-years away in the little-observed southern constellation Reticulum. The image was captured by the James Webb Space Telescope.&nbsp;</p>



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



<p>"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>.</p>



<p>"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."</p>



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



<p>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;</p>



<p>"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."</p>



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



<p>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.</p>



<p>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.</p>



<p>"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."</p>



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



<p>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.</p>



<p>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>.</p>



<p>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.</p>



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



<p>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.</p>



<p>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.</p>



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



<p>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.</p>



<p>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. </p>



<p>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.</p>



<p>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. </p>



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



<p>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. </p>



<p>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.</p>



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



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Spiral galaxy NGC 1559 is a loner in outer space

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

<p>Today's <strong>Image of the Day</strong> from the European Space Agency features NGC 1792, a spiral galaxy located in the constellation Columba, about 43 million light-years away from Earth.&nbsp;</p>



<p>This galaxy, discovered by British astronomer James Dunlop in 1826, is part of the larger NGC 1808 group of galaxies.&nbsp;</p>



<h2 class="wp-block-heading" id="h-intimate-view-of-ngc-1792">Intimate view of NGC 1792</h2>



<p>“An orange glow radiates from the center of NGC 1792, the heart of this stellar forge. Captured by the NASA/ESA Hubble Space Telescope, this intimate view of NGC 1792 gives us some insight into this galactic powerhouse,” noted <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>.</p>



<p>“The vast swathes of tell-tale blue seen throughout the galaxy indicate areas that are full of young, hot stars, and it is in the shades of orange, seen nearer the center, that the older, cooler stars reside.”</p>



<h2 class="wp-block-heading" id="h-vigorous-star-formation-nbsp">Vigorous star formation&nbsp;</h2>



<p>NGC 1792 is notable for its vigorous star formation, classifying it as a starburst galaxy. This high rate of star formation is thought to be triggered by gravitational interactions with neighboring galaxies, though the exact cause is still under study.</p>



<p>“Nestled in the constellation of Columba (The Dove), NGC 1792 is both a spiral galaxy, and a starburst galaxy,” said ESA. “Within starburst galaxies, stars are forming at comparatively exorbitant rates. The rate of star formation can be more than 10 times faster in a starburst galaxy than in the Milky Way.”</p>



<h2 class="wp-block-heading" id="h-fierce-bursts-of-star-formation">Fierce bursts of star formation</h2>



<p>ESA noted that when galaxies have a large reservoir of gas, like NGC 1792, these short-lived starburst phases can be sparked by galactic events such as mergers and tidal interactions.&nbsp;</p>



<p>“One might think that these starburst galaxies would easily consume all of their gas in a large forming event. However, supernova explosions and intense stellar winds produced in these powerful starbursts can inject energy into the gas and disperse it.”&nbsp;</p>



<p>“This halts the star formation before it can completely deplete the galaxy of all its fuel. Scientists are actively working to understand this complex interplay between the dynamics that drive and quench these fierce bursts of star formation.”</p>



<p>Due to its distance and brightness, NGC 1792 can be observed with medium-sized telescopes under favorable conditions.</p>



<h2 class="wp-block-heading" id="h-galaxy-evolution">Galaxy evolution</h2>



<p>Galaxy evolution refers to the process by which galaxies form and change over time. It begins in the early universe, shortly after the <a href="https://www.earth.com/news/new-observations-disprove-big-bang-theory-universe-began-tired-light-theory/" target="_blank" rel="noreferrer noopener">Big Bang</a>, when small density fluctuations in the primordial gas led to the collapse of matter into the first galaxies. </p>



<h3 class="wp-block-heading" id="h-galaxy-mergers">Galaxy mergers</h3>



<p>These early galaxies were small and irregular, composed mostly of gas and dark matter. Over billions of years, galaxies grew larger by merging with one another and by accreting gas from the surrounding space.&nbsp;</p>



<p>These interactions often triggered bursts of star formation, and collisions between galaxies sometimes led to the creation of new, more massive galaxies.</p>



<h3 class="wp-block-heading" id="h-structural-changes">Structural changes</h3>



<p>As galaxies evolve, their morphology - their shape and structure - can change. Early galaxies were often irregular or disk-shaped, but over time, many galaxies formed into the elliptical or spiral shapes we see today.&nbsp;</p>



<h3 class="wp-block-heading" id="h-star-formation">Star formation</h3>



<p>Star formation is a key driver of galaxy evolution, but it gradually slows down as galaxies age. </p>



<p>The gas that fuels <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> can be used up, or it can be heated and pushed out of galaxies by supernovae or black holes, reducing the galaxy's ability to form new stars.</p>



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



<p>The environment in which a galaxy resides also plays a role in its evolution. Galaxies in dense clusters are more likely to interact with their neighbors, which can alter their shape or trigger bursts of star formation.&nbsp;</p>



<p>In contrast, galaxies in more isolated regions of space evolve more slowly and without as many dramatic interactions.</p>



<h3 class="wp-block-heading" id="h-dark-matter">Dark matter</h3>



<p>Dark matter also plays a crucial role in galaxy evolution. It provides the gravitational framework that holds galaxies together and influences their interactions with one another.&nbsp;</p>



<p>Supermassive <a href="https://www.earth.com/search-results/?search=Galaxies%20merge&amp;start=0" target="_blank" rel="noreferrer noopener">black holes</a>, found at the centers of most large galaxies, can also affect their evolution by releasing energy that impacts star formation and the movement of gas within the galaxy.</p>



<p>Overall, galaxy evolution is a complex and ongoing process driven by interactions between stars, gas, <a href="https://www.earth.com/news/study-dark-matter-does-not-exist-and-the-universe-is-27-billion-years-old/" target="_blank" rel="noreferrer noopener">dark matter</a>, and black holes, and shaped by both internal processes and external influences.</p>



<p>Image Credit<strong>:</strong> ESA/Hubble &amp; NASA, J. Lee</p>



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NGC 1792: A galactic powerhouse 

<p>Today's Image of the Day from NASA Earth Observatory features the Fedchenko Glacier in the Pamir Mountains of Tajikistan. It is one of the world's longest glaciers outside of the polar regions.&nbsp;</p>



<p>“An astronaut aboard the International Space Station took this photo of glaciers in the high-elevation valleys of the Pamir Mountains of Central Asia. The upper portion of Fedchenko Glacier crosses the center of the scene.”</p>



<p>NASA noted that most of the larger glaciers in the image show a prominent pattern of light- and dark-brown parallel lines.&nbsp;</p>



<p>“The darker ‘streamlines,’ known as medial moraines, give a sense of the direction of flow of the ice down the valleys. These are concentrations of debris that has been eroded by the glacier from the adjacent mountainsides or a rocky outcrop,” said NASA.</p>



<h2 class="wp-block-heading" id="h-fedchenko-a-high-altitude-glacier">Fedchenko: A high-altitude glacier</h2>



<p>Fedchenko Glacier stretches for approximately 48 miles and covers an area of around 270 square miles. This massive glacier is a critical source of <a href="https://www.earth.com/news/satellites-reveal-a-sudden-drop-in-global-freshwater-levels/" target="_blank" rel="noreferrer noopener">freshwater</a>, feeding several rivers and influencing the region's hydrology.</p>



<p>Fedchenko Glacier lies at high altitudes, with its origins in the high peaks of the Pamirs, where snow accumulates heavily. Despite being situated in a relatively arid region, the glacier's significant size and volume are maintained by substantial snowfall.&nbsp;</p>



<p>Named after Alexei Pavlovich Fedchenko, a Russian explorer and naturalist, the glacier was first surveyed in 1928 during Soviet-era expeditions. It plays a crucial role in climate studies, as changes in its length and mass provide insights into the effects of global warming in Central Asia.&nbsp;</p>



<p>The glacier is also part of a spectacular and remote landscape, surrounded by towering <a href="https://www.earth.com/news/early-humans-preferred-the-mountains-and-it-changed-our-evolution/" target="_blank" rel="noreferrer noopener">mountains</a> and rugged terrain, making it a key feature of the Pamirs' natural beauty.&nbsp;</p>



<h2 class="wp-block-heading" id="h-threats-to-glaciers-worldwide">Threats to glaciers worldwide</h2>



<p>Like many glaciers worldwide, Fedchenko faces the threat of retreat due to <a href="https://www.earth.com/news/peru-has-lost-over-half-of-its-glaciers-in-six-decades/" target="_blank" rel="noreferrer noopener">global warming</a>, raising concerns about water availability and ecosystem changes in the region.</p>



<p>Rising global temperatures caused by greenhouse gas emissions are the primary driver of glacier melting. Warmer temperatures not only melt glacier surfaces but also increase the flow of meltwater beneath them, accelerating their disintegration.</p>



<h3 class="wp-block-heading" id="h-human-activities-and-pollution-nbsp">Human activities and pollution&nbsp;</h3>



<p>Deforestation and urbanization exacerbate these effects by reducing reflective snow cover and increasing heat absorption in nearby areas.&nbsp;</p>



<p>Airborne pollutants like soot and black carbon darken glacier surfaces, reducing their ability to reflect sunlight and speeding up the rate of melting. </p>



<p>Industrial activities and tourism in glacier regions add physical stress and pollution, further degrading these fragile ecosystems.</p>



<h3 class="wp-block-heading" id="h-water-supplies">Water supplies</h3>



<p>The loss of glaciers has far-reaching consequences. It disrupts freshwater supplies for millions of people who depend on glacial runoff for drinking water, agriculture, and hydropower.&nbsp;</p>



<h3 class="wp-block-heading" id="h-rising-sea-levels">Rising sea levels</h3>



<p><a href="https://www.earth.com/news/melting-glaciers-unleash-invasive-species-into-unexpected-areas/" target="_blank" rel="noreferrer noopener">Melting glaciers</a> contribute to rising sea levels, threatening coastal communities and ecosystems worldwide. Additionally, the loss of glaciers impacts biodiversity, as many species rely on cold, glacial habitats for survival.</p>



<h3 class="wp-block-heading" id="h-protecting-glaciers">Protecting glaciers</h3>



<p>Efforts to mitigate these threats focus on reducing <a href="https://www.earth.com/news/melting-glaciers-are-hidden-sources-of-greenhouse-gases/" target="_blank" rel="noreferrer noopener">greenhouse gas</a> emissions, protecting glacier regions from industrial exploitation, and promoting sustainable tourism practices.&nbsp;</p>



<p>However, without urgent action, the continued decline of glaciers will have profound implications for the planet's climate, water systems, and ecosystems.</p>



<h2 class="wp-block-heading" id="h-the-pamir-mountains-nbsp">The Pamir Mountains&nbsp;</h2>



<p>The Pamir Mountains, often called the "Roof of the World," are a vast and rugged mountain range located in Central Asia.&nbsp;</p>



<p>They span across Tajikistan, Afghanistan, China, and Kyrgyzstan, forming a vital part of the junction where the Himalayas, the Tian Shan, the Karakoram, the Kunlun, and the Hindu Kush converge.&nbsp;</p>



<p>With peaks soaring over 7,000 meters, including Ismoil Somoni Peak, the range is home to some of the highest altitudes on Earth.</p>



<p>The Pamir Mountains have been central to trade and cultural exchange for centuries, serving as a critical segment of the ancient Silk Road.&nbsp;</p>



<p>Today, the mountains are a popular destination for trekkers and explorers drawn by their breathtaking beauty and challenging terrain.</p>



<p>The Pamirs are not only a natural wonder but also a biological treasure trove, supporting unique wildlife that is adapted to extreme altitudes.&nbsp;</p>



<p>Culturally, the mountains are home to diverse communities, each with its unique traditions and ways of life, shaped by the harsh but majestic environment.</p>



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



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Fedchenko Glacier in the Pamir Mountains

<p>Today's <strong>Image of the Day</strong> from the European Space Agency features the spiral galaxy IC 5332, which is located over 29 million light-years away from Earth.</p>



<p>The galaxy spans approximately 66,000 light-years in diameter. This makes it notably smaller than our <a href="https://www.earth.com/news/large-amount-of-dark-matter-may-be-missing-from-the-milky-way/" target="_blank" rel="noreferrer noopener">Milky Way</a>, which is just over 100,000 light-years in diameter. </p>



<h2 class="wp-block-heading" id="h-unprecedented-look-at-ic-5332">Unprecedented look at IC 5332</h2>



<p>In a stunning photo release by NASA and ESA in 2022, the spiral galaxy IC 5332 was presented in an unprecedented level of detail. The images were captured by the <a href="https://www.earth.com/news/james-webb-captures-incredible-new-image-of-uranus/" target="_blank" rel="noreferrer noopener">James Webb Space Telescope</a>.</p>



<p>This feat was made possible through the use of the Mid-InfraRed Instrument (MIRI), which captures images in the mid-infrared spectrum.</p>



<h2 class="wp-block-heading" id="h-unique-perspective-from-earth">Unique perspective from Earth</h2>



<p>One of the most striking features of IC 5332, as revealed by these observations, is its almost perfect face-on orientation relative to Earth.&nbsp;</p>



<p>This unique perspective allows astronomers to clearly observe and admire the symmetrical arrangement of its spiral arms.</p>



<h2 class="wp-block-heading" id="h-webb-unveils-ic-5332-in-new-light">Webb unveils IC 5332 in new light</h2>



<p>The clarity of these images represents a significant advancement over previous observations made by the Hubble Space Telescope, which imaged IC 5332 in ultraviolet and visible light.&nbsp;</p>



<p>While Hubble’s images revealed the galaxy’s symmetrical spiral arms, James Webb’s MIRI has unveiled these structures as a complex web of gas that emits infrared light at various temperatures.</p>



<h2 class="wp-block-heading" id="h-the-miri-instrument-on-james-webb-nbsp">The MIRI instrument on James Webb&nbsp;</h2>



<p>Capturing this range of infrared light is no simple task. It requires highly specialized instruments that must be maintained at extremely cold temperatures.&nbsp;</p>



<p>The MIRI instrument on the James Webb Space Telescope is specifically designed for this purpose and performs exceptionally well. Its capabilities allow astronomers to see aspects of <a href="https://www.earth.com/news/james-webb-captures-galaxies-that-are-too-old-to-exist/" target="_blank" rel="noreferrer noopener">galaxies</a> that are otherwise hidden in other wavelengths.</p>



<p>The detailed images provided by MIRI offer more than just a visual spectacle; they provide valuable data about the composition and temperature of the gases that make up the spiral arms of IC 5332. </p>



<p>This can help scientists understand the processes of star formation within the galaxy and how these processes compare to those in our own <a href="https://www.earth.com/news/stars-at-the-edge-of-our-milky-way-galaxy-travel-more-slowly/" target="_blank" rel="noreferrer noopener">Milky Way</a>.</p>



<h2 class="wp-block-heading" id="h-webb-finds-hidden-features-of-the-universe-nbsp">Webb finds hidden features of the universe&nbsp;</h2>



<p>The images of IC 5332 served as a critical test of the James Webb Space Telescope’s capabilities in observing the universe in infrared light. </p>



<p>As astronomers continue to explore with Webb’s full suite of instruments, many more hidden features of the universe will be revealed.</p>



<p>The information provided by the <a href="https://www.earth.com/news/webb-telescope-discovers-second-most-distant-galaxy-in-pandoras-cluster/" target="_blank" rel="noreferrer noopener">James Webb Space Telescope</a> not only expands our understanding of the cosmos but also enhances our appreciation for the complex and beautiful structures that exist in our universe.&nbsp;</p>



<h2 class="wp-block-heading" id="h-spiral-galaxies-like-ic-5332">Spiral galaxies like IC 5332</h2>



<p>Spiral galaxies are some of the most visually striking objects in the universe, characterized by their rotating arms that extend from a central nucleus, giving them a distinct spiral appearance.&nbsp;</p>



<p>These galaxies are primarily made up of a flat, rotating disk containing stars, gas, and dust, and a central concentration of stars known as the bulge. These are often surrounded by a much fainter halo of stars, many of which reside in globular clusters.</p>



<p>Spiral galaxies differ from other galaxy types, such as elliptical and irregular galaxies, in their structure and content. </p>



<p>The spiral arms are sites of ongoing star formation and are brighter than the rest of the disk because of the young, hot stars that are typically found there. The arms appear distinct because of their density waves, which compress the gas and dust, leading to star formation.</p>



<p>The rotation of the spiral arms also contributes to the galaxy's flat shape due to the centrifugal forces acting on the disk. The central bulge can vary in size and often contains older, red stars.&nbsp;</p>



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



<p>Some spiral galaxies have a bar-shaped structure that extends from the central bulge, making them barred spirals. This bar affects the motion of stars and gas within the galaxy and can influence star formation activity.</p>



<p>Spiral galaxies are an important focus of study because they contain a significant amount of visible matter and play a crucial role in understanding the formation and evolution of galaxies.&nbsp;</p>



<p>Their distinct features also make them particularly useful for studying the laws of physics under extreme conditions, such as high densities and velocities.</p>



<p>Image Credit: <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">ESA</a>/Webb, NASA &amp; CSA, J. Lee and the PHANGS-JWST and PHANGS-HST Teams</p>



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



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

Spiral galaxy IC 5332: A complex web of gas and light

<p>Phosphorus, a crucial nutrient for soil fertility and life sustainability, is increasingly vanishing from U.S. farmland, washing into rivers and streams at alarming rates.&nbsp;</p>



<p>A new study led by researchers at the <a href="https://www.psu.edu/" target="_blank" rel="noreferrer noopener">Pennsylvania State University</a> reveals that despite efforts to curb phosphorus loss, agricultural runoff has continued to rise over the past four decades, posing significant threats to <a href="https://www.earth.com/news/vaccinating-plants-could-boost-global-food-security/" target="_blank" rel="noreferrer noopener">food security</a> and water quality.</p>



<h2 class="wp-block-heading" id="h-soil-nutrient-and-phosphorus-loss">Soil nutrient and phosphorus loss</h2>



<p>Phosphorus is indispensable for life, playing a key role in DNA formation and cellular energy transfer.&nbsp;</p>



<p>However, unlike nitrogen, it is a non-renewable resource with limited geological reserves. Once it is lost from soil and enters <a href="https://www.earth.com/news/humans-impacts-on-waterways-contribute-to-the-climate-crisis/" target="_blank" rel="noreferrer noopener">waterways</a>, it cannot naturally replenish in agricultural lands.</p>



<p>“This is a problem for many reasons,” said Li Li, professor of civil and environmental engineering at Penn State and corresponding author of the study.&nbsp;</p>



<p>“When it’s lost from farmland, it can reduce crop yields, potentially leading to higher food prices. Then, when phosphorus enters our waterways, it can cause harmful algal blooms that can make water unsafe for swimming and fishing - and can even reduce oxygen levels in water and kill fish and other aquatic life.”</p>



<p>Li also highlighted the economic impact of phosphorus depletion: “It makes it more expensive to treat drinking water, which means higher water bills for all of us.”</p>



<h2 class="wp-block-heading" id="h-rising-phosphorus-levels-in-rivers">Rising phosphorus levels in rivers</h2>



<p>Analyzing data from 430 U.S. <a href="https://www.earth.com/news/global-warming-is-disrupting-the-seasonal-flow-of-rivers/" target="_blank" rel="noreferrer noopener">rivers</a> spanning 1980 to 2019, the research team used a deep learning model to uncover troubling trends. </p>



<p>While phosphorus levels have declined in 60% of the studied rivers, overall phosphorus flowing into waterways has increased.</p>



<p>“Agricultural areas are the biggest contributors to the problem, with phosphorus levels increasing in most rivers near agricultural areas, even as they decline in rivers near urban areas,” Li explained.&nbsp;</p>



<p>“This suggests that efforts to control phosphorus pollution from sources like agricultural runoff are not as effective as we thought.”</p>



<p>By contrast, targeted efforts to reduce phosphorus pollution from urban wastewater treatment plants appear to be succeeding.&nbsp;</p>



<h2 class="wp-block-heading" id="h-soil-nutrient-loss-is-beyond-local-control">Soil nutrient loss is beyond local control </h2>



<p>However, the researchers warn that the broader problem is worsening due to factors beyond local control, particularly the increased frequency of extreme weather events linked to climate change.</p>



<p>“This means that even though we’re doing a better job at limiting phosphorus pollution from urban areas, the problem is getting worse overall, due to factors largely beyond the control of just one region,” Li said.</p>



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



<p><a href="https://www.earth.com/news/droughts-and-extreme-weather-events-are-escalating/" target="_blank" rel="noreferrer noopener">Extreme weather events</a>, such as heavier rainfall and flooding, have amplified phosphorus runoff into waterways. As storms grow wetter and more frequent due to climate change, the volume of water flowing through rivers increases, pulling more phosphorus from the soil.</p>



<p>“We’ve seen from recent weather events that water quantity, the amount of water that storms and waterways carry, can lead to dangerous flooding and mudslides,” Li said.&nbsp;</p>



<p>“What we wanted to understand is what happens to the land when these storms pull the subsurface of the soil into rivers and streams. What we found is an alarming loss of this finite element that lets soil sustain life.”</p>



<h2 class="wp-block-heading" id="h-innovative-solutions-are-needed">Innovative solutions are needed</h2>



<p>To combat this escalating issue, the researchers emphasize the need for innovation and changes in agricultural practices. One promising development is a technology invented at Penn State by alumnus Hunter Swisher.</p>



<p>Swisher, founder and CEO of <a href="https://www.phospholutions.com/" target="_blank" rel="noreferrer noopener">Phospholutions</a>, has developed a fertilizer designed to improve phosphorus efficiency in soil. “We are advocating for more innovation, more creativity and more urgency,” Li said.</p>



<p>The company’s product has shown remarkable results, reducing phosphorus runoff potential by 78% compared to conventional fertilizers.&nbsp;</p>



<p>Phospholutions is now expanding its technology across the Americas, Europe, and India, aiming to address phosphorus pollution on a global scale.</p>



<h2 class="wp-block-heading" id="h-a-ddressing-soil-nutrient-loss"><strong>A</strong>ddressing soil nutrient loss</h2>



<p>The study highlights the urgent need for comprehensive strategies to address phosphorus loss.&nbsp;</p>



<p>With climate change exacerbating the problem, researchers call for a combination of advanced technologies and sustainable farming practices to mitigate the impacts on both <a href="https://www.earth.com/news/climate-and-agriculture-are-locked-in-a-destructive-feedback-loop/" target="_blank" rel="noreferrer noopener">agriculture</a> and aquatic ecosystems.</p>



<p>“The connection between water and land is essential, and that balance is growing increasingly fragile,” Li concluded.</p>



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



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Soil nutrient loss due to heavy rainfall threatens agriculture 

Phosphorus, a crucial nutrient for soil fertility and life sustainability,...

<p>A team of scientists led by the Wellcome Sanger Institute has developed the most detailed cellular map of the human gut to date, combining data from 1.6 million cells.&nbsp;</p>



<p>This atlas provides crucial insights into conditions like bowel cancer and inflammatory bowel disease (IBD) by highlighting cellular changes and interactions within the gastrointestinal (GI) tract.</p>



<p>Published in the journal <a href="http://dx.doi.org/10.1038/s41586-024-07571-1" target="_blank" rel="noreferrer noopener"><em>Nature</em></a>, the study combined over 25 single-cell datasets to create a unified and freely available resource for researchers worldwide. </p>



<p>The atlas includes samples from both healthy individuals and those with <a href="https://www.earth.com/news/new-tool-detects-changes-in-gut-health-to-help-prevent-disease/" target="_blank" rel="noreferrer noopener">gut</a>-related diseases, offering a valuable tool for understanding and potentially treating these conditions.</p>



<h2 class="wp-block-heading" id="h-the-gi-tract-and-its-illnesses">The GI tract and its illnesses</h2>



<p>The GI tract comprises organs responsible for <a href="https://www.earth.com/news/coffee-stimulates-digestion-and-protects-against-disease/" target="_blank" rel="noreferrer noopener">digestion</a> and nutrient absorption, including the stomach, intestines, and rectum. It also acts as a barrier against pathogens. Disorders affecting this system, such as IBD and bowel cancer, significantly impact millions of lives globally.</p>



<p>For instance, over seven million people worldwide suffer from <a href="https://www.earth.com/news/wolves-have-gut-bacteria-that-can-help-dogs-with-canine-ibd/" target="_blank" rel="noreferrer noopener">IBD</a>, which includes conditions like ulcerative colitis and Crohn’s disease. Symptoms such as abdominal pain, diarrhea, and extreme fatigue often disrupt daily life. </p>



<p>Meanwhile, bowel cancer, one of the most common cancers globally, affects nearly two million people each year and is the fourth most prevalent cancer in the UK.</p>



<h2 class="wp-block-heading" id="h-a-unified-picture-of-gut-cells">A unified picture of gut cells</h2>



<p>Despite extensive research, fragmented data from multiple studies with varying processes and labeling systems have complicated efforts to understand the cellular structure of the gut.&nbsp;</p>



<p>To address this, the <a href="https://www.sanger.ac.uk/" target="_blank" rel="noreferrer noopener">Wellcome Sanger Institute</a> team developed a tool to harmonize these datasets, enabling researchers to see a unified picture of gut cells, their locations, and their interactions.</p>



<h2 class="wp-block-heading" id="h-a-new-resource-for-gut-health-research">A new resource for gut health research</h2>



<p>The researchers merged 25 datasets to create an atlas containing spatial and single-cell data from 1.6 million cells.&nbsp;</p>



<p>This unified resource includes tissue samples from individuals with conditions like gastric and <a href="https://www.earth.com/news/daily-aspirin-use-strongly-tied-to-colorectal-cancer-prevention/" target="_blank" rel="noreferrer noopener">colorectal cancers</a>, celiac disease, and IBD, as well as from healthy individuals.</p>



<p>The atlas allows researchers to identify which cells are present in the gut, their precise locations, and how they communicate with their environment.&nbsp;</p>



<p>By integrating this data, the team has created a dynamic resource that can be updated with future studies, enhancing collaboration among scientists worldwide.</p>



<p>“Spatial and single-cell data provide unique information about how gut cells interact, that can be used to continue piecing together an in-depth understanding of how the human body works,” said lead author Amanda Oliver, a scientist at the Wellcome Sanger Institute.&nbsp;</p>



<p>“Combining existing single-cell datasets allows us to create a more complete picture of the human gut and ensures that researchers can work together to continue to benefit human health.”&nbsp;</p>



<p>“Our Gut Cell Atlas is also harmonized and freely available, and we hope that people will continue to build on this, adding in data for scientists worldwide to use.”</p>



<h2 class="wp-block-heading" id="h-insights-into-gut-inflammation">Insights into gut inflammation</h2>



<p>One of the study’s significant findings involves gut metaplastic cells. Previously known for their role in healing the stomach lining, these cells were found to share genetic similarities with inflammatory cells in the gut.&nbsp;</p>



<p>Researchers suggest that in conditions like IBD, inflammation transforms these metaplastic cells, perpetuating a cycle of inflammation that contributes to pain and distress.</p>



<p>Study co-senior author Rasa Elmentaite is a scientist at <a href="https://www.ensocell.com/" target="_blank" rel="noreferrer noopener">Ensocell Therapeutics</a> who previously worked at the Wellcome Sanger Institute.</p>



<p>“As the integrated atlas contains such a large amount of data, from people with and without gut conditions, we were able to uncover a pathogenic cell type that may play a role in some chronic conditions and could be a target for intervention in the future,” said Elmentaite.&nbsp;</p>



<p>“This demonstrates the power of using integrated single-cell atlases in research, and I am confident that applying this approach to other tissues and organs will drive new therapeutic discoveries for a range of conditions.”&nbsp;</p>



<p>Understanding this cycle of inflammation could pave the way for innovative treatments for IBD and similar chronic conditions.</p>



<h2 class="wp-block-heading" id="h-human-cell-atlas-initiative">Human Cell Atlas initiative</h2>



<p>This research is part of the Human Cell Atlas (HCA) initiative, which aims to map every cell type in the human body to better understand human health and disease.&nbsp;</p>



<p>The Gut Cell Atlas is among more than 40 studies recently published in <em>Nature</em> journals, representing a significant leap in cellular biology and the development of new analytical tools.</p>



<p>Professor Sarah Teichmann, co-senior author and co-founder of the HCA, highlighted the collaborative nature of the project.&nbsp;</p>



<p>“A detailed understanding of cells through the Human Cell Atlas will help explain many aspects of human health and disease and possibly illuminate new avenues for treatment,” said Teichmann.&nbsp;</p>



<p>“This harmonized Gut Cell Atlas shows what can be achieved through open collaboration with scientists worldwide, and has led to an accessible combined resource that can be used by everyone to find new ways to understand and treat disease.”</p>



<h2 class="wp-block-heading" id="h-a-tool-for-global-collaboration">A tool for global collaboration</h2>



<p>The Gut Cell Atlas not only advances gut research but also provides a framework for studying other organs.&nbsp;</p>



<p>Its harmonized data and innovative analytical tools could drive breakthroughs in understanding various conditions and developing new therapies.&nbsp;</p>



<p>With the resource freely accessible, it stands as a testament to the power of open collaboration in science.</p>



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



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Map of 1.6 million gut cells will reveal new ways to treat disease

A team of scientists led by the Wellcome Sanger Institute...

<p>The magnetic North Pole, a vital navigational anchor for our planet, is far from stationary. Most of us remain blissfully unaware that it shifts constantly under the influence of dynamic forces beneath the Earth’s crust. </p>



<p>However, recent movements have been more extreme than usual, making people take notice. Once steady, this silent sentinel has recently been speeding erratically toward Russia at an unprecedented pace.</p>



<p>Such rapid shifts could have dramatic consequences, disrupting modern navigation systems and, by extension, the way we navigate our daily lives.</p>



<h2 class="wp-block-heading" id="h-what-exactly-is-the-magnetic-north-pole">What exactly is the magnetic North Pole?</h2>



<p>First, let's make it clear what exactly we're talking about. The magnetic North Pole is the point on Earth where the <a href="https://www.earth.com/earthpedia-articles/earths-magnetic-field-origin-structure-and-impact-on-humanity/" target="_blank" rel="noreferrer noopener">planet’s magnetic field</a> points directly downward. This is the direction that your compass needle aligns with when you’re navigating outdoors. </p>



<p>Unlike the geographic North Pole, which is fixed in the Arctic, the magnetic north pole is constantly on the move, drifting several kilometers each year due to changes in Earth’s molten core. </p>



<p>This movement can sometimes throw off navigation systems, requiring updates to maps and compasses to stay accurate.</p>



<p>What makes the magnetic North Pole even more interesting is how it affects both technology and nature. </p>



<p>For example, airplanes and ships rely on accurate magnetic readings for safe travel, while some animals use Earth’s magnetic field to migrate across vast distances. </p>



<h2 class="wp-block-heading" id="h-the-northern-odyssey-from-canada-to-siberia">The northern odyssey: From Canada to Siberia</h2>



<p>Ever since we started tracking it, the magnetic North Pole has been on the move. However, its recent behavior is quite out of the ordinary. </p>



<p>Once comfortably located in northern Canada, the pole kicked into high gear in the late 20th century, making its way across the <a href="https://www.earth.com/news/arctic-ocean-warming-four-times-faster-than-global-average/" target="_blank" rel="noreferrer noopener">Arctic Ocean</a> by the 1990s.</p>



<p>From there, the pace has increased progressively , peaking at an astonishing 55 kilometers per year during the 2010s.</p>



<p>Presently, it's hurtling at a slightly reduced but still impressive speed of 25 kilometers per year towards Siberia.</p>



<h2 class="wp-block-heading" id="h-what-s-steering-the-magnetic-north-pole">What's steering the magnetic North Pole?</h2>



<p>Intellectually stimulating debates have arisen among scientists trying to decipher the underlying cause of this unusual phenomenon.</p>



<p>Dr. William Brown, a renowned geomagnetic field analyst, identifies three possible culprits behind the magnetic North Pole's unusual behavior. </p>



<p>First, changes in the flow of molten iron beneath the <a href="https://www.earth.com/news/earths-crust-is-dripping-under-turkey/" target="_blank" rel="noreferrer noopener">Earth’s crust</a> could be altering the magnetic field’s strength and direction, as the planet's outer core dynamics play a crucial role in generating the field in the first place.</p>



<p>Second, high-energy solar particles interacting with the <a href="https://www.earth.com/news/mysterious-solar-shockwave-has-cracked-earths-magnetosphere/" target="_blank" rel="noreferrer noopener">Earth’s magnetosphere</a>, such as during solar storms and winds, might be causing fluctuations in the magnetic field. </p>



<p>Finally, the phenomenon may be linked to the Earth's history of magnetic pole reversals, which have occurred nearly 200 times over the past 100 million years. The most recent of these reversals occurred approximately 800,000 years ago.</p>



<h2 class="wp-block-heading" id="h-navigating-without-a-north-star">Navigating without a North Star</h2>



<p>The potential chaos that the moving magnetic pole can cause is not abstract or confined to scholarly concern. </p>



<p>Our technology is deeply intertwined with magnetic orientations, and any abrupt changes can cause significant turmoil. </p>



<p>Devices like smartphones, cars, and military equipment rely on the World Magnetic Model (WMM), which is designed by the British Geological Survey and NOAA. </p>



<p>This model tracks the pole’s movements and ensures accurate <a href="https://www.earth.com/news/earths-magnetic-field-is-shifting-and-putting-navigation-at-risk/" target="_blank" rel="noreferrer noopener">navigation</a>. If the pole's movement outpaces updates to the WMM, our devices could miscalculate locations and throw our wayfinding abilities into disarray.</p>



<h2 class="wp-block-heading" id="h-preparing-for-the-polar-paradox">Preparing for the polar paradox</h2>



<p>Mitigating the potential risks of such a change involves a three-pronged approach: frequent updates to the WMM, expanding research to continue monitoring the <a href="https://www.earth.com/news/earths-inner-core-rotation-has-begun-moving-backwards/" target="_blank" rel="noreferrer noopener">Earth’s core</a> dynamics, and raising public awareness. </p>



<p>Through these efforts, industries that rely heavily on magnetic field-based navigation are being prepped for any potential upcoming disruptions.</p>



<h2 class="wp-block-heading" id="h-gearing-up-for-a-world-upside-down">Gearing up for a world upside down?</h2>



<p>While the pole's movement is no longer as rapid, it remains a crucial area of research.</p>



<p>Scientists from <a href="https://www.noaa.gov/" target="_blank" rel="noreferrer noopener">NOAA</a> and other organizations are keeping a close eye on its shifting trajectory, ensuring our technological world is prepared for any seismic shifts in Earth's magnetic nature. </p>



<p>In the face of a potential world where the poles flip, these insights and precautionary measures could prove indispensable.</p>



<p>So, the magnetic North Pole's flight towards Russia isn't just an intriguing natural occurrence. Its implications for our global navigation systems and technologies could be profound and far-reaching. </p>



<h2 class="wp-block-heading" id="h-magnetic-north-pole-and-earth-s-future">Magnetic North Pole and Earth’s future</h2>



<p>Rapid movement of the magnetic North Pole&nbsp;is&nbsp;not&nbsp;just&nbsp;an&nbsp;issue&nbsp;for&nbsp;technology&nbsp;and navigation but&nbsp;also&nbsp;offers&nbsp;insight&nbsp;into the inner workings&nbsp;of the Earth.<br><br>The&nbsp;erratic&nbsp;behavior of the&nbsp;pole&nbsp;reflects&nbsp;what is happening in&nbsp;the dynamic processes&nbsp;deep within our&nbsp;outer core, where molten iron generates&nbsp;a&nbsp;<a href="https://www.earth.com/news/doughnut-shaped-region-discovered-in-earths-liquid-core-impacts-our-magnetic-field/" target="_blank" rel="noreferrer noopener">magnetic field</a>.<br><br>By studying this phenomenon, scientists can gain a better understanding of Earth's geodynamo,&nbsp;which is&nbsp;the engine behind the magnetic field that shields us from harmful solar radiation.<br><br>The&nbsp;shifting&nbsp;pole&nbsp;also&nbsp;raises questions over the possibility of a full magnetic reversal - a natural process&nbsp;in&nbsp;which&nbsp;the North and South magnetic poles swap places.<br><br>While such reversals have happened thousands of times in&nbsp;the&nbsp;Earth's history, their effects&nbsp;cannot&nbsp;be predicted.</p>



<p>A reversal could temporarily weaken Earth's magnetic field,&nbsp;meaning that&nbsp;the planet would be exposed to&nbsp;more intense and damaging cosmic radiation,&nbsp;which would affect living organisms, ecosystems and infrastructure.<br><br>Monitoring&nbsp;changes&nbsp;in&nbsp;this&nbsp;manner&nbsp;helps researchers&nbsp;keep&nbsp;an eye on&nbsp;the Earth's interior and also&nbsp;prepares&nbsp;humanity for potential future challenges.</p>



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Magnetic North Pole is moving faster than ever as it races toward Russia

The magnetic North Pole, a vital navigational anchor for our...

<p></p>
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<p>                <br />
<span style="font-weight: 400;">Today’s </span><b>Video of the Day</b><span style="font-weight: 400;"> comes from the </span><a href="https://www.acs.org/content/acs/en.html"><span style="font-weight: 400;">American Chemical Society</span></a><span style="font-weight: 400;">’s </span><i><span style="font-weight: 400;">Reactions </span></i><span style="font-weight: 400;">series and features a look at a delicacy known as century eggs, or pidan.</span></p>
<p><span style="font-weight: 400;">Pidan is a cuisine that originated in the Ming Dynasty era of China and is made up of fermented duck eggs. </span></p>
<p><span style="font-weight: 400;">The eggs are coated in a paste consisting of <a href="https://www.earth.com/news/salt-dangerous-healthy-diet/">salt</a>, quicklime, sodium carbonate, ash, and tea and then are rolled in rice husks and left to ferment.</span></p>
<p><span style="font-weight: 400;">&#8212;</span></p>
<p><i><span style="font-weight: 400;">By </span></i><a href="mailto:rarnold@earth.com"><i><span style="font-weight: 400;">Rory Arnold</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>
<p><i><span style="font-weight: 400;">Video Credit: </span></i><a href="https://www.acs.org/content/acs/en.html"><i><span style="font-weight: 400;">American Chemical Society</span></i></a></p>

Old fermented eggs make a delicacy known as pidan