Today's Image of the Day 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.



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.



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



"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>.



"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."



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



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;



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.



"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."



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;



"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;



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



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



"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.



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>.



“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."



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



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



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.



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



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. 



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.



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



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;



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.



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. 



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.



Image Credit: NASA Earth Observatory



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The Corbassière glacier in the Swiss Alps

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

Today's Image of the Day 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.



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



"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>.



"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." 



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.



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



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



"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.



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



“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.



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



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;



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



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. 



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



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



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. 



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​.



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



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​​. 



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​​.



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. 



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​​.



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



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:



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



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.



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



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.



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



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



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



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.



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



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



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



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.



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



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.



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.



Image Credit: NASA Earth Observatory



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

Haze pollution is an environmental crisis in Thailand

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



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



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



“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.



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;



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.



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



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.



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



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.



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.



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.



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



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;



“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.



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.



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.



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



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;



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.



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;



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.



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



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;



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.



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.



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;



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.



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



“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.



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



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;



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.



Image Credit: NASA, ESA, CSA, STScI



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The ice giant Uranus in stunning detail

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

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



“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.” 



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.”



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



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.



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;



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



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



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.



“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.



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.



“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.



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



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;



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



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.



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



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



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



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



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.



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



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.



Tropical cyclones typically lack fronts, whereas extratropical cyclones are defined by them.



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



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



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.



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.”



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



Image Credit: NASA Earth Observatory



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Bomb cyclone rapidly intensified in the Pacific Northwest

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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Spiral galaxy NGC 1559 is a loner in outer space

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

Today's Image of the Day 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;



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



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



“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>.



“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.”



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



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.



“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.”



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



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;



“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;



“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.”



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



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



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. 



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



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;



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



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



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;



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



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



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.



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



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;



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



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



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;



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.



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.



Image Credit: ESA/Hubble &amp; NASA, J. Lee



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NGC 1792: A galactic powerhouse 

Hot Springs National Park in <a href="https://www.earth.com/image/flooding-on-the-arkansas-river/">Arkansas</a> is captured in stunning detail in this Image of the Day, thanks to the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a>. Hot Springs National Park in Arkansas is both the smallest and most urban national park in the United States. It covers 5,550 acres in the Ouachita Mountains.

Hot Springs National Park

For the past two months, a small asteroid named 2024 PT5 has been keeping Earth company, acting as a temporary "mini-moon." This week, it's set to drift away, pulled by the stronger gravity of the sun.



Richard Binzel, an astronomer at the Massachusetts Institute of Technology (<a href="https://www.mit.edu" target="_blank" rel="noreferrer noopener">MIT</a>), has been following these kinds of celestial visitors for years. 



"These happen more often than we think, but they're small and tough to spot," Binzel explained. "Only lately have our telescopes become powerful enough to catch them regularly."



In August, a team of astronomers from the <a href="https://www.ucm.es/english" target="_blank" rel="noreferrer noopener">Complutense University</a> of Madrid detected 2024 PT5 using a powerful telescope in Sutherland, South Africa. 



They weren't the only ones watching; NASA's Asteroid Terrestrial-impact Last Alert System (<a href="https://fallingstar.com/home.php" target="_blank" rel="noreferrer noopener">ATLAS</a>) at Haleakala Observatory in Hawaii first noticed the asteroid on August 7, 2024.



This discovery has excited astronomers, offering a rare chance to learn more about <a href="https://www.earth.com/news/nasa-test-simulation-shows-earth-not-prepared-prevent-large-asteroid-strike/" target="_blank" rel="noreferrer noopener">near-Earth objects</a>. But what exactly is 2024 PT5, and why does it matter?



<h2 class="wp-block-heading" id="h-2024-pt5-tiny-asteroid-big-role">2024 PT5: Tiny asteroid, big role</h2>



<a href="https://www.earth.com/news/its-official-earth-now-has-two-moons-captured-asteroid-2024-pt5/" target="_blank" rel="noreferrer noopener">Earth occasionally captures small asteroids</a> like 2024 PT5, placing them into temporary orbits around our planet. 



While most asteroids orbit the sun on regular paths, some come close enough for Earth's gravity to grab them for a brief visit. 



These cosmic hitchhikers stay with us for a short time -- typically a few weeks or months -- before breaking free and continuing their journey around the sun.



"All mini-moons are unique in their own way," said William Blackmore, Planetarium Director and Astronomy Instructor at <a href="https://www.mhcc.edu/" target="_blank" rel="noreferrer noopener">Mt. Hood Community College</a>. "This one isn't different from others except that it's the most recent."



<h2 class="wp-block-heading" id="h-comparing-2024-pt5-to-the-moon">Comparing 2024 PT5 to the Moon</h2>



To put things into perspective, 2024 PT5 is about 37 feet across. In contrast, <a href="https://www.earth.com/news/how-did-earth-get-its-moon-a-new-theory-has-emerged/" target="_blank" rel="noreferrer noopener">Earth's main moon</a> stretches a massive 2,159 miles in diameter. 



That makes our moon over 300,000 times wider than this tiny asteroid. Knowing it's up there is pretty exciting, even if we can't see it without some serious telescopic equipment.



"These temporary captures are natural cosmic laboratories," Binzel mentioned. "They help us understand the small bodies that <a href="https://www.earth.com/news/27500-hidden-near-earth-asteroids-discovered-using-google-cloud/" target="_blank" rel="noreferrer noopener">come close to Earth</a> and could be important for future space missions."



<h2 class="wp-block-heading" id="h-how-2024-pt5-became-a-mini-moon">How 2024 PT5 became a mini-moon</h2>



Understanding how 2024 PT5 became Earth's temporary companion involves a bit of <a href="https://www.earth.com/news/finding-order-in-the-chaos-of-the-three-body-problem/" target="_blank" rel="noreferrer noopener">orbital mechanics</a>. 



Blackmore explained, "It's moving along with us in our orbit around the sun. It's part of a group of asteroids called the Arjuna asteroids, which move at about the same pace as Earth."



He added an analogy to make it clearer: 



"Imagine a skateboarder dropping into a skate park. They ride the curves, adding energy as they go. That's like the asteroid getting caught in <a href="https://www.earth.com/news/dart-mission-debris-will-create-a-human-made-meteor-shower/" target="_blank" rel="noreferrer noopener">Earth's gravitational field</a>, riding the curve before moving on."



<h2 class="wp-block-heading" id="h-spotting-mini-moons-like-2024-pt5">Spotting mini-moons like 2024 PT5</h2>



Catching sight of mini-moons is no easy task. 



They're incredibly small and faint, often just a few dozen feet across, which means they don't reflect much sunlight. This makes them nearly invisible against the dark backdrop of space.



Astronomers use powerful telescopes equipped with <a href="https://www.earth.com/news/gaia-reveals-moons-around-hundreds-of-asteroids/" target="_blank" rel="noreferrer noopener">sensitive detectors and smart software</a> to find them. 



Projects like the ATLAS system scan the skies every night, searching for any objects that weren't there before. 



When they spot something moving in a way that suggests it's close to Earth, they alert other astronomers to help confirm the find.



"It's a collaborative effort," Blackmore said. "Combining technology and teamwork helps us spot these elusive cosmic visitors."



<h2 class="wp-block-heading" id="h-why-does-any-of-this-matter">Why does any of this matter?</h2>



While 2024 PT5 doesn't pose any threat to Earth, <a href="https://www.earth.com/news/is-there-a-fifth-force-of-nature-asteroids-provide-new-clues/" target="_blank" rel="noreferrer noopener">studying it is crucial</a>. 



"It's important to analyze how it moves and interacts with Earth's gravitational pull," Blackmore noted. "This helps us refine our techniques for tracking objects that could cross our path again."



Another expert, Todd, highlighted the practical applications of this knowledge. 



"We need to understand how to intercept an asteroid at a distance and change its direction," he said. "This could be vital in <a href="https://www.earth.com/news/nasa-dart-mission-proves-humanity-can-be-saved-from-asteroid-collision/" target="_blank" rel="noreferrer noopener">preventing potential impacts</a> in the future."



<h2 class="wp-block-heading" id="h-challenges-in-observing-2024-pt5">Challenges in observing 2024 PT5</h2>



For those eager to see this mini-moon, experts warn that it would be extremely difficult. 



"You'd need a telescope with a diameter of at least 30 inches," Blackmore mentioned. "That's beyond what most amateur astronomers have."



Todd agreed, adding, "It won't be visible to the naked eye. Being 33 feet wide and so far away, you'd need a very large telescope."



<h2 class="wp-block-heading" id="h-inspiration-for-future-space-missions">Inspiration for future space missions</h2>



Blackmore envisioned future missions that could take advantage of these temporary visitors. 



"It would be fascinating if we had missions ready to send small satellites or probes to these objects when they come close," he mused. "Imagine building a network of sensors or cameras traveling along with us, like space webcams."



Todd also saw potential in <a href="https://www.earth.com/news/asteroid-named-psyche-is-worth-10000-quadrillion-for-whoever-can-extract-minerals/" target="_blank" rel="noreferrer noopener">asteroid mining</a> and scientific discovery. 



"There might be materials on these asteroids that we can't find on Earth," he said. "They could solve problems in medicine or technology. But we need to weigh the benefits carefully."



<h2 class="wp-block-heading" id="h-brief-visit-with-a-lasting-impact">Brief visit with a lasting impact</h2>



The short stay of asteroid 2024 PT5 serves as a reminder of the dynamic nature of our solar system. While it didn't stick around long, its presence offered valuable opportunities for learning and exploration.



As technology advances, we'll likely spot more of these mini-moons. Each one gives us a chance to understand our cosmic environment better and prepare for the future.



The full study was published in the&nbsp;<a href="https://iopscience.iop.org/article/10.3847/2515-5172/ad781f" target="_blank" rel="noreferrer noopener">journal IOPscience</a>.



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Earth has lost its mini-moon, which may have come from our main Moon

For the past two months, a small asteroid named 2024...

In the world of science, we often focus on what we see. We examine what is visible, tangible, and easy to perceive with our own two eyes. But what about the sounds of the past - more specifically, the sounds of dinosaurs?



How can we possibly know what a creature from millions of years ago sounded like? Well, this can be answered using paleoacoustics.



Before we dive into the how, let's take a moment to consider what we are talking about. Picture the Parasaurolophus - a duck-billed <a href="https://www.earth.com/news/rare-triassic-fossil-gondwanax-paraisensis-may-rewrite-history-of-dinosaurs/" target="_blank" rel="noreferrer noopener">dinosaur</a> with a unique crest.



This huge creature, standing around 16 feet tall and weighing between 6,000 to 8,000 pounds, dominated the landscapes some 70 million to 80 million years ago. It has been named in many science fiction films and dinosaur-themed games.



<h2 class="wp-block-heading" id="h-decoding-dinosaur-sounds">Decoding dinosaur sounds</h2>



Sound is essentially vibrations traveling through the air. These vibrations hit our eardrums, get converted into electrical signals, and are interpreted by our brains. 



But for creatures like the Parasaurolophus, with unique physical attributes, their sounds would have been produced and resonated differently.



The starting point to understanding how the Parasaurolophus might have sounded is through mathematical modeling. 



Sounds a bit strange, doesn't it? But it's not just number crunching. Math is a universal language that is able to represent complex physical phenomena in a way that can be computed, simulated, and even visualized.



<h2 class="wp-block-heading" id="h-exploring-what-dinosaurs-sounded-like">Exploring what dinosaurs sounded like</h2>



Enter our scientist, Hongjun Lin, a researcher at <a href="https://www.nyu.edu" target="_blank" rel="noreferrer noopener">New York University</a> who is on a mission to decode the sounds of the past.



He presented his research on the acoustic characteristics of a physical model of the Parasaurolophus' crest at the 187th Meeting of the Acoustical Society of America in November 2024.



"I've been fascinated by giant animals ever since I was a kid. I'd spend hours reading books, watching movies, and imagining what it would be like if <a href="https://www.earth.com/news/carnian-pluvial-episode-one-million-years-of-rain-triggered-dinosaur-takeover-of-earth/" target="_blank" rel="noreferrer noopener">dinosaurs</a> were still around today," said Lin.



But a realization in college sparked a new direction for Lin's passion. "It wasn't until college that I realized the sounds we hear in movies and shows - while mesmerizing - are completely fabricated using sounds from modern animals."



"That's when I decided to dive deeper and explore what dinosaurs might have actually sounded like."



<h2 class="wp-block-heading" id="h-creating-dinosaur-sounds">Creating dinosaur sounds</h2>



To bring mathematics into the tangible realm, Lin created a physical setup - affectionately named the "Linophone." It is made of tubes that resemble the resonance chambers used in musical instruments.



This theoretical model, despite its simplicity, was pivotal in approximating what was happening acoustically inside the Parasaurolophus' crest.



The Linophone isn’t a perfect replica of the Parasaurolophus, but it's a stepping stone - a means to verify the mathematical framework.



Lin's initial findings suggest that the Parasaurolophus' crest was used for resonance, a phenomenon not unfamiliar to us - it’s the same principle that gives birds their unique songs.



<h2 class="wp-block-heading" id="h-where-do-we-go-from-here">Where do we go from here?</h2>



The journey has just begun. Lin's research is far from complete, and the mathematical model is still a work in progress. 



But the implications of this study extend beyond just dinosaurs. This research paves the way for studying animals with similar vocal structures, leading to a deeper understanding of Earth's ancient inhabitants.



The idea doesn't stop there. Lin shares his plan for the future - an accessible plug-in for people to experiment with and even incorporate dinosaur sounds into music. Can you imagine rock and roll with a dash of Parasaurolophus?



"Once we have a working model, we'll move toward using&nbsp;fossil&nbsp;scans," Lin said. "My ultimate goal is to re-create the sound of the Parasaurolophus."



<h2 class="wp-block-heading" id="h-understanding-how-dinosaurs-communicated">Understanding how dinosaurs communicated</h2>



Understanding how dinosaurs communicated provides insights into their social structures and behaviors. The Parasaurolophus, with its crest capable of producing distinctive sounds, is a fascinating subject to explore these <a href="https://www.earth.com/news/qunkasaura-pintiquiniestra-new-sauropod-dinosaur-discovered-in-spain/" target="_blank" rel="noreferrer noopener">dynamics</a>. 



This anatomical feature may have allowed it to generate low-frequency calls, which could travel across long distances - a valuable adaptation for herd communication over expansive territories.



Such communication would have played a pivotal role in coordinating movement, warning of approaching predators, or even engaging in mating rituals. 



As research progresses, scientists hope to unravel whether these sounds were unique to each species, locality, or even individual, offering a more nuanced picture of dinosaur life.



<h2 class="wp-block-heading" id="h-broader-implications-of-the-research">Broader implications of the research </h2>



While Lin's work has primarily focused on recreating the sounds of the Parasaurolophus, the broader implications of paleoacoustic research are vast. 



By refining techniques and understanding, scientists can apply these methods to other <a href="https://www.earth.com/news/nadir-crater-second-massive-asteroid-impact-discovered-dinosaur-extinction/" target="_blank" rel="noreferrer noopener">prehistoric animals</a>, providing a comprehensive soundtrack of the past. These innovations bolster educational tools, allowing students and enthusiasts worldwide to engage more deeply with Earth's history through sound. 



The field also enriches other disciplines, such as paleontology, biology, and acoustics - promoting interdisciplinary collaboration and innovative thinking.



As the boundaries of current research continue to expand, so too does our capacity to connect with the ancient world, transforming silent fossils into a symphony of prehistory.



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What did dinosaurs sound like?

In the world of science, we often focus on what...

The Arctic plays an increasingly important role in global discussions about rising sea levels and the threats they pose to coastal areas around the world.



With this in mind, it is necessary to explore the intricate process of calving - where ice breaks away from a glacier's edge.



This phenomenon significantly contributes to sea-level rise, which makes it imperative that we understand the process and can use it to predict future changes in our world.



<h2 class="wp-block-heading" id="h-arctic-exploration-with-sentinel-1">Arctic exploration with Sentinel-1</h2>



A recent stride forward in this quest for understanding has been made by a remarkable collaboration between I-SEA (based in France) and <a href="https://www.norceresearch.no/en/" target="_blank" rel="noreferrer noopener">NORCE</a> (from Norway). 



As part of the Space for Shore project, the scientists have made extensive use of over a thousand images from the Sentinel-1 mission.



Their purpose? To meticulously monitor the evolution of Svalbard's coastal <a href="https://www.earth.com/news/the-worlds-glaciers-contain-less-ice-than-previously-thought/" target="_blank" rel="noreferrer noopener">glaciers</a>.



The Sentinel-1 mission, a key element of the European Union’s Copernicus Program, employed synthetic aperture radar (SAR) technology to capture high-resolution data in the challenging Arctic conditions.



Thanks to this technology, there is now consistent, year-round monitoring of these critical glaciers.



<h2 class="wp-block-heading" id="h-measuring-calving-activity">Measuring calving activity</h2>



Using Sentinel-1 data between 2015 and 2023, the researchers were able to map glacier front lines and measure calving activity during <a href="https://www.earth.com/image/svalbard-melts-into-the-arctic-ocean/" target="_blank" rel="noreferrer noopener">Svalbard</a>’s summer months, the period when calving intensities peak.



One significant breakthrough was the ability to define the summer glacier fronts. 



The researchers examined images taken between July and September and were able to identify summer glacier fronts as areas where glacier extent is maintained 95% of the time during these months.



What's more, the team found a way to understand summer calving intensity by observing floating <a href="https://www.earth.com/news/iceberg-that-weighs-more-than-the-eiffel-tower-is-floating-freely/" target="_blank" rel="noreferrer noopener">icebergs</a> and growlers. 



Interestingly, summers with a higher occurrence of these ice masses indicate more active calving and accelerated glacier retreat. These are crucial signs of a glacier’s health and stability.



<h2 class="wp-block-heading" id="h-observing-changes-in-arctic-glaciers">Observing changes in Arctic glaciers</h2>



In Kongsfjorden, one of the primary study areas, glaciers like Kronebreen and Kongsvegen showed significant changes.



Daily Sentinel-1 observations were used to classify the region into areas of glacier, iceberg, and growler occurrence.



 The Sentinel-1 method "provides a statistically defined composite of the <a href="https://www.earth.com/news/ice-free-arctic-summers-could-be-the-new-normal-by-2030/" target="_blank" rel="noreferrer noopener">summer glacier</a> front positions and calving intensities, revealing the dynamic interactions between ice and ocean over time," explained Jörg Haarpaintner, a team member from NORCE.



Manon Tranchand, the project's lead researcher, noted that this analysis paints a clear picture of current changes in Arctic glaciers.



"They're crucial for predicting the future impacts of climate change on these sensitive regions," said Tranchand. 



"Without the consistent, high-resolution data from Sentinel-1, monitoring these dynamic ice-ocean interactions wouldn't be possible. Ongoing warming is likely to accelerate ice loss, and our data show how that could contribute to global sea-level rise. Sentinel-1’s capabilities allow us to capture these shifts with unprecedented accuracy."



<h2 class="wp-block-heading" id="h-the-launch-of-sentinel-1c">The launch of Sentinel-1C</h2>



Scheduled for launch next month, Sentinel-1C represents a significant leap forward in the monitoring of Arctic glaciers and global climate impacts.



The soon-to-be addition to the Sentinel-1 mission will offer enhanced radar imaging capabilities and improved continuity for crucial climate research.



With its advanced capabilities, Sentinel-1C will amplify our ability to capture detailed, year-round data on glacier front lines, <a href="https://www.earth.com/news/birth-of-an-iceberg-a-83-breaks-free-from-antarctica/" target="_blank" rel="noreferrer noopener">calving</a> rates, and ice-ocean interactions, even amidst the challenging conditions of the Arctic. 



<h2 class="wp-block-heading" id="h-global-implications-of-arctic-ice-loss">Global implications of Arctic ice loss</h2>



The insights gained from monitoring Arctic glacier calving extend far beyond the region itself. 



As glaciers retreat and calving intensifies, the influx of freshwater into the oceans disrupts natural currents, including the Atlantic Meridional Overturning Circulation (AMOC), a critical component of Earth's climate system. 



This disruption could lead to significant shifts in weather patterns, such as harsher winters in Europe and intensified monsoons in South Asia.



Moreover, Arctic ice loss exacerbates the global feedback loop of climate change. As ice melts, it exposes darker ocean water, which absorbs more sunlight, accelerating warming - a phenomenon known as the albedo effect.



These changes not only impact the Arctic's fragile ecosystems but also have cascading effects on biodiversity, fisheries, and human livelihoods worldwide.



By understanding the intricacies of glacier calving through missions like Sentinel-1, researchers are equipping policymakers with the tools to anticipate and mitigate these far-reaching impacts. 



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Satellite images reveal hidden retreat of Arctic glaciers

The Arctic plays an increasingly important role in global discussions...

Picture this: every time you use water from your tap, you're inadvertently influencing our Earth's rotational tilt and climate change. Bizarre, right? 



Well, this is the reality we're living in, according to a study published in the journal Geophysical Research Letters.



<h2 class="wp-block-heading" id="h-impact-of-groundwater-pumping">Impact of groundwater pumping</h2>



Our planet is a dynamic entity, constantly shifting and adapting. Believe it or not, something as seemingly insignificant as our water usage can cause Earth's physical orientation to deviate. 



Over less than two decades, our groundwater pumping has tilted the <a href="https://www.earth.com/news/earth-days-getting-longer-rotation-slows-climate-change/" target="_blank" rel="noreferrer noopener">Earth</a> by 31.5 inches. To put this into perspective, this water redistribution equates to approximately 0.24 inches of sea-level rise.



“Our study shows that among climate-related causes, the redistribution of groundwater actually has the largest impact on the drift of the rotational pole,” said Ki-Weon Seo, a geophysicist at <a href="https://en.snu.ac.kr/index.html" target="_blank" rel="noreferrer noopener">Seoul National University</a>.



So, before you dismiss the power of your water usage, remember, even the smallest actions have consequences.



<h2 class="wp-block-heading" id="h-groundwater-s-role-in-earth-s-tilt">Groundwater's role in Earth's tilt</h2>



The study, which included data from 1993 through 2010, showed that pumping as much as 2,150 gigatons of groundwater has caused a shift in the Earth's tilt. These figures are hard to comprehend, but they reflect our intense water consumption for irrigation and human use.



We may not think about where our water goes after we use it, but most of it ends up being transported to the oceans. 



“Observing changes in Earth’s rotational pole is useful for understanding continent-scale water storage variations,” said Seo.



Linking these variations to water movement, particularly from western North America and northwestern India, shows how our everyday actions can impact the <a href="https://www.earth.com/news/earths-rotation-is-shifting-toward-a-25-hour-day/" target="_blank" rel="noreferrer noopener">Earth</a> on a global scale.



<h2 class="wp-block-heading" id="h-rotational-pole-drift">Rotational pole drift</h2>



Alongside influencing our planet's tilt and rotation, groundwater pumping paints an alarming picture for the consequences of climate change. 



“I’m very glad to find the unexplained cause of the rotation pole drift. On the other hand, as a resident of Earth and a father, I’m concerned and surprised that pumping groundwater is another source of sea-level rise,” said Seo.



These findings might seem overwhelming, especially considering the challenges we already face in combating climate change. However, understanding the impact of groundwater pumping on Earth's tilt and climate is a step in the right direction. 



This knowledge can potentially guide conservationists toward effective strategies to mitigate further sea-level rise and other climate issues.



<h2 class="wp-block-heading" id="h-groundwater-pumping-and-polar-motion">Groundwater pumping and polar motion</h2>



The new revelations about groundwater pumping open new doors for our understanding of climate change and our capacity for action.



"They’ve quantified the role of groundwater pumping on polar motion, and it’s pretty significant," said Surendra Adhikari, a research scientist at NASA’s Jet Propulsion Laboratory.



The potential for change isn't exclusive to scientists and researchers. As individuals, we can adapt our habits and live more sustainably. This awareness around groundwater pumping's global impact should empower us to reconsider our everyday water usage.



<h2 class="wp-block-heading" id="h-future-research-and-policy-initiatives">Future research and policy initiatives </h2>



Given the significant findings of the study, future research and policy initiatives must prioritize sustainable groundwater management to mitigate its adverse impacts on Earth's rotation and climate change. 



It is imperative to balance human needs with environmental conservation, which requires innovative approaches to water usage, such as enhanced irrigation <a href="https://www.earth.com/news/our-moon-is-drifting-away-and-earth-will-never-be-the-same-without-it/" target="_blank" rel="noreferrer noopener">systems</a>, rainwater harvesting, and improved municipal water management. 



Furthermore, global cooperation among countries is essential to create comprehensive policies that address the equitable distribution and consumption of water resources. 



By encouraging multidisciplinary collaboration among geophysicists, climate scientists, policy-makers, and the public, we can develop a robust framework for more sustainable water management practices. 



Such initiatives not only hold promise for protecting Earth's rotational stability but also contribute to broader climate change mitigation efforts.



<h2 class="wp-block-heading" id="h-water-taps-tilting-the-earth">Water taps tilting the Earth</h2>



The journey towards understanding and combating climate change is a long and complex one. But in this struggle, knowledge is power. 



Understanding the impact of groundwater pumping is an invaluable tool in our arsenal.



As we look to the future, let's harness this knowledge and strive for a more sustainable world.



The study is published in the journal <a href="https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL103509" target="_blank" rel="noreferrer noopener">Geophysical Research Letters</a>.



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Our everyday water use is literally tilting the Earth

Picture this: every time you use water from your tap,...

Our food choices hold immense power. Not just over our personal health, but also for the Earth itself. Shifting towards sustainable diets can significantly combat climate change and food scarcity. 



But, implementing such changes on a global scale requires delicacy due to the interconnectedness of our global food network.



<h2 class="wp-block-heading" id="h-global-food-chain">Global food chain</h2>



The world's food system is a complex, interconnected web. A shift in food demand in one corner of the globe can have far-reaching effects on people in other parts of the world, often in ways we might not initially anticipate. 



“Changes in food demand in one part of the world can have cascading environmental and <a href="https://www.earth.com/news/what-you-eat-can-literally-change-the-world/" target="_blank" rel="noreferrer noopener">human welfare</a> implications for people around the world),” said Joe DeCesaro, data analyst at UC Santa Barbara’s&nbsp;National Center for Ecological Analysis &amp; Synthesis (<a href="https://www.nceas.ucsb.edu/" target="_blank" rel="noreferrer noopener">NCEAS</a>).



<h2 class="wp-block-heading" id="h-decoding-the-global-diet-shifts">Decoding the global diet shifts</h2>



To navigate the complexity of the global <a href="https://www.earth.com/news/world-food-day-fighting-global-hunger/" target="_blank" rel="noreferrer noopener">food system</a> and ensure a healthy population and planet, a comprehensive shift in our global diet is needed. 



DeCesaro, along with a team of international researchers, embarked on the ambitious mission to understand where and how environmental pressures might occur within global dietary shifts.



The experts analyzed four types of diets - Indian, Mediterranean, EAT-Lancet (primarily plant-based), and food-based dietary guidelines (FBDGs).



<h2 class="wp-block-heading" id="h-tale-of-four-diets">Tale of four diets</h2>



The team's findings, published in the journal Environmental Research Letters, show that the Indian diet emerging as the most beneficial of the four, estimated to reduce <a href="https://www.earth.com/news/feeding-children-healthy-diets-can-be-very-challenging/" target="_blank" rel="noreferrer noopener">food</a> production-based global environmental pressure by a remarkable 20.9 percent.



On the other hand, the food-based dietary guidelines were projected to potentially increase environmental pressure by a staggering 35.2 percent.



<h2 class="wp-block-heading" id="h-global-food-system-and-sustainable-diets">Global food system and sustainable diets</h2>



Our global food system is a major player in environmental change. It is linked to about a third of global greenhouse gas emissions and over 70% of freshwater resources.



Shifting towards a more sustainable diet - leaning away from resource-intensive foods like red meat - can decrease the environmental pressure, bring health benefits, and increase the intake of nutrient-dense foods like vegetables and legumes.



<h2 class="wp-block-heading" id="h-who-bears-the-environmental-burden">Who bears the environmental burden?</h2>



The research team's curiosity didn't end at understanding the impact of dietary changes. They sought to find out who would bear the environmental burden brought on by these diet shifts. 



“The research was motivated originally by the question: Who’s consumption is generating the pressures of food production that are being felt by people and places around the world?” DeCesaro noted.



“Are poorer countries paying the environmental price of producing higher pressure foods that are being eaten by richer countries or vice versa? Our methods allow us to track changes in the environmental pressures from the producer to the consumer, and vice versa, in a standardized format across four pressures. Our work is quite novel in this space.”



"The Indian and FBDGs being directly from government recommendations, the Mediterranean being widely discussed for its health benefits, and the EAT-Lancet diet being developed by subject matter experts,” DeCesaro said. 



<h2 class="wp-block-heading" id="h-power-of-sustainable-diets">Power of sustainable diets</h2>



Their findings revealed that except for the FBDGs, shifts to all other diets resulted in reductions in global cumulative pressure. 



The Indian diet performed best due to its recommendation of zero red meat consumption, while food-based dietary guidelines typically suggest more red meat than countries currently consume.



However, these global pressure reductions would primarily rely on dietary shifts in higher-income countries. 



“Higher-income countries’ average current diets have higher consumption quantities of most food categories than the recommended quantities in our diet scenarios,” noted DeCesaro.



<h2 class="wp-block-heading" id="h-sustainable-diets-and-lower-income-countries">Sustainable diets and lower-income countries</h2>



A shift towards more sustainable, plant-forward <a href="https://www.earth.com/news/eating-less-could-extend-your-lifespan/" target="_blank" rel="noreferrer noopener">diets</a> would increase environmental pressures related to food production in lower-income countries. But, DeCesaro explained that this is mainly due to the diet scenarios meeting more of their daily needs.



The researchers advocate for support from wealthier countries via access to imports of efficiently produced foods, economic development, and sharing knowledge of efficient and environmentally friendly food production practices.



At the end of the day, our decisions about what we eat are vital for reducing our environmental footprint. Nevertheless, others might pay the price for those decisions, concluded Halpern.



As global citizens, we thus share the responsibility of making informed food choices that nourish both ourselves and the world we live in.



The study is published in the journal <a href="https://iopscience.iop.org/article/10.1088/1748-9326/ad8509" target="_blank" rel="noreferrer noopener">Environmental Research Letters</a>.



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Sustainable diets can reduce environmental pressure

Our food choices hold immense power. Not just over our...

Our planet Earth has a mesmerizing history that spans across 4.6 billion years. For a majority of this immense timeframe, single-celled life reigned supreme. 



But, about 500 million years ago, everything changed immensely. A dramatic occurrence took place known as the Cambrian “explosion."



During this period, an enormous diversity of life forms made an appearance and found a place for themselves in the fossil record. 



Imprinted in these preserved fossils, we can find traces of diverse animal groups that eventually evolved into animal species we see around us today, including us humans.



<h2 class="wp-block-heading" id="h-grand-canyon-reveals-earth-s-past">Grand Canyon reveals Earth's past</h2>



Now, an intriguing paper published by a team of researchers from The University of New Mexico (<a href="https://www.unm.edu" target="_blank" rel="noreferrer noopener">UNM</a>) has added fresh insights into this fascinating event in <a href="https://www.earth.com/news/mountain-building-triggered-a-mass-extinction-event/" target="_blank" rel="noreferrer noopener">Earth's history</a>. 



“The Tonto Group of Grand Canyon holds a treasure trove of sedimentary layers and fossils chronicling the Cambrian Explosion some 500 million years ago, when the first animals with hard shells rapidly proliferated and sea levels rose to envelop continents with emerging marine life,” said Carol Dehler, professor at <a href="https://www.usu.edu" target="_blank" rel="noreferrer noopener">Utah State University</a>.



Dehler served as the lead author for this paper, with UNM's adjunct professor and paleontologist, Fred Sundberg, serving as the co-lead author.



<h2 class="wp-block-heading" id="h-new-model-of-the-cambrian-explosion">New model of the Cambrian explosion</h2>



This research doesn't just bring <a href="https://www.earth.com/news/cambrian-explosion-fossil-sponges/" target="_blank" rel="noreferrer noopener">evolutionary advances</a> to the table; it also has implications for geoscience education. 



The study builds on Eddy McKee's classic model for marine transgression (the spread of seas across continents), which was developed 50 years ago based on these same rocks. 



McKee's model, taught to geology students worldwide, suggests a gradual deepening and slow shifts in sedimentary environments.



“Our new model for deposition of the Tonto Group is much more nuanced, showing a mixture of marine and non-marine settings, breaks or unconformities when no sediment was being deposited, and a much faster tempo of evolution," noted Professor Karlstrom.



"Even more than before, the Tonto Group of Grand Canyon remains one of the most important Cambrian-type sections in the world because of its complete exposure.”



<h2 class="wp-block-heading" id="h-dating-methods-used-for-the-study">Dating methods used for the study</h2>



The application of advanced techniques has provided new insights into the rate at which rock sedimentation occurred and has offered hints into how marine species like trilobites and other early animals diversified swiftly.



“Our new tandem U-Pb dating methods are refining precise ages for each layer in the succession and for the transitions between trilobite biozones,” said Schmitz. 



“We are finding that different trilobite species radiated, then went extinct at a very fast, sub-million year, tempo.”



The dating methods used for the study involve extracting hundreds of sand-sized zircon crystals from a ground-up sedimentary rock sample. 



The U-Pb ratios of these grains were first obtained using a preliminary method for swift dating, and then the youngest grains were precisely dated using a more elaborate laboratory technique.



<h2 class="wp-block-heading" id="h-new-details-about-the-cambrian-explosion">New details about the Cambrian explosion</h2>



"Sedimentary rocks are hard to date," said Crossey. "But the deposition of the sediment and fossils entombed within it, must be younger than the age of the youngest grain so with many dates we can bracket sedimentary ages"



The team's new model, when compared to McKee's model, provides key pathways that can enable students, researchers, and even anyone interested in geology to understand the Cambrian explosion on a deeper level.



“From the Tonto Group’s 500-meter-thick strata, we’re learning about sea-level rise and the effects of catastrophic tropical storms – probably more powerful than today’s devastating hurricanes. This occurred in a world without land plants and during a period of very hot temperatures when the Earth was ice-free,” said Dehler. 



“Sea levels were so high that sediments like the Tonto Group were deposited atop most continents in environments that allowed rapid expansion of <a href="https://www.earth.com/news/world-animal-day-2024-building-a-legacy-of-compassion/" target="_blank" rel="noreferrer noopener">animal</a> diversity on Earth.”



With advances like these, we can better understand and appreciate the complexity and beauty of the Cambrian explosion and Earth's history, making us more connected to the past, and more conscious about how our actions today might shape the future.



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The team also included Karl Karlstrom and Laurie Crossey, distinguished professors at UNM, James Hagadorn from the Denver Museum of Nature and Science, Mark Schmitz from Boise State University, and Steve Rowland from the <a href="https://www.unlv.edu" target="_blank" rel="noreferrer noopener">University of Nevada Las Vegas</a>.



The study is published in the journal <a href="https://www.geosociety.org/GSA/Publications/GSA_Today/GSA/GSAToday/science/G604A/abstract.aspx" target="_blank" rel="noreferrer noopener">GSA Today</a>.



Image Credit: UNM Newsroom



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Grand Canyon fossils reveal secrets that will force rewrite of evolution textbooks

Our planet Earth has a mesmerizing history that spans across...

Tarantulas are among the captivating wildlife that makes western Cuba more than just a vibrant and culture-rich destination. Recently, this intriguing ecosystem has revealed a charismatic new addition: a unique type of tarantula.



The remarkable creature is more than just another arachnid species - it is a symbol of the magic of nature and its ability to surprise us continuously.



<h2 class="wp-block-heading" id="h-discovery-of-the-tarantula-in-cuba">Discovery of the tarantula in Cuba</h2>



The discovery of the new tarantula species, known as Trichopelma grande, was made by David Ortiz from <a href="https://studyatmasaryk.cz/" target="_blank" rel="noreferrer noopener">Masaryk University</a> in Czechia and Elier Fonseca from the Cuban Zoological Society in Cuba.



In their study, published recently in the Journal of Natural History, the researchers detailed the distinctive traits that set Trichopelma grande apart from its arachnid kin.



<h2 class="wp-block-heading" id="h-details-of-tarantula-dna">Details of tarantula DNA</h2>



This new species has already carved out a special place for itself in the Trichopelma genus because it is the largest and hairiest of its kind.



But there’s more to it than meets the eye. To confirm the tarantula's place within this genus, the researchers carried out a phylogenomic analysis using data on Ultraconserved Elements (UCE) in the DNA, as well morphological assessments.



They successfully extracted, sequenced, and evaluated high-quality <a href="https://www.earth.com/news/dna-analysis-can-predict-which-animals-are-at-risk-of-extinction/" target="_blank" rel="noreferrer noopener">DNA</a> data from the tarantula, which included data from 1,348 target UCE loci.



The genetic information was then compared with data from 27 other theraphosid genera.



<h2 class="wp-block-heading" id="h-tarantulas-in-the-greater-antilles">Tarantulas in the Greater Antilles</h2>



The new species is not as large as some tarantulas can be, but is the largest known species in its genus. It also has several special features that differentiate it from other <a href="https://www.earth.com/news/two-new-tarantula-species-discovered-in-ecuador/">species</a> in the same genus. 



For one, the abundance of long "hairs" sticking out from the middle and lower portions of its legs make it look as though it is walking on feather dusters. It also does not dwell in the trees but prefers the ground, where it constructs burrows with a trap-door entrance for quick retreat.



There is a rich diversity of tarantula spiders in the Greater Antilles, with 11 endemic species of Trichopelma spiders found on Cuba alone. Other Trichopelma species also use burrows with trap doors, making this typical behavior in this group of arachnids. 



<h2 class="wp-block-heading" id="h-unique-appearance-of-the-tarantula">Unique appearance of the tarantula </h2>



Apart from being unusually hairy, this tarantula's abdomen sports a unique pattern of spots and six darker and lighter transversal stripes. These stripes are divided in the middle by a single, longitudinal pale stripe.



Strangely, the dorsal side of its cephalothorax is smooth and hairless, despite the fact that the rest of its body is covered in thick, chestnut-brown "hair."



<h2 class="wp-block-heading" id="h-the-potential-conservation-challenge">The potential conservation challenge</h2>



The new species was found only within a limited range in the Viñales National Park, a <a href="https://www.earth.com/news/how-the-amazon-became-a-biodiversity-hotspot/" target="_blank" rel="noreferrer noopener">biodiversity hotspot</a> in western Cuba.



All four captured specimens were discovered within a 20-kilometer radius of each other, suggesting a potentially restricted distribution.



The apparent scarcity, along with the limited habitat range of this unique species, raises certain conservation concerns that scientists will need to address in future.



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



Tarantulas, including newly discovered species like Trichopelma grande, play a significant role in maintaining ecological balance in ecosystems. As <a href="https://www.earth.com/news/tarantulas-have-beneficial-partnerships-with-other-species/" target="_blank" rel="noreferrer noopener">predators</a>, they help control insect populations, which prevents overpopulation that could harm local flora.



The presence of tarantulas is also important in terms of the food web, as they become prey for larger animals, including birds and small mammals.



This intricate relationship highlights the importance of preserving such species and their habitats to maintain <a href="https://www.earth.com/news/healthy-ecosystems-are-needed-to-prevent-future-pandemics/" target="_blank" rel="noreferrer noopener">healthy ecosystems</a>.



However, tarantulas face threats that extend beyond habitat loss. Human activities, such as the spread of invasive species, can disrupt their environment, making it difficult for these creatures to thrive.



<h2 class="wp-block-heading" id="h-conservation-efforts-are-needed">Conservation efforts are needed</h2>



For Trichopelma grande, whose known range is limited to the Viñales National Park, conservation efforts are crucial to ensure its survival and prevent potential endangerment.



Protecting the Park’s ecosystem is not just about conserving a single species; it’s about safeguarding the broader ecological network that sustains all of the species residing there.



In addition to their ecological importance, tarantulas hold cultural significance in many regions. From symbolizing resilience to being featured in local folklore, these spiders have intrigued humans for centuries. 



The discovery of Trichopelma grande adds to this narrative, reinforcing the wonder and complexity of nature. It serves as a reminder that there are still many mysteries left to uncover in connection with the wildlife that shares our world.



The study is published in the journal <a href="https://www.tandfonline.com/doi/full/10.1080/00222933.2024.2401921" target="_blank" rel="noreferrer noopener">Journal of Natural History</a>.



Image Credit: Journal of Natural History (2024)



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Giant tarantula discovered in Cuba has 'feather-duster' legs

Tarantulas are among the captivating wildlife that makes western Cuba...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Nushagak Bay in southwest Alaska

[sendtonews key="0ynNMYkMKa-2340414-12187" type="single"] Today’s Video of the Day from the...

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Flu viruses are more flexible than expected

[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Lake Trasimeno in Central Italy

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Detecting mercury contamination with the tap of a finger

[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"] Today's Video of the Day from the...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Kainji Lake, a reservoir on the Niger River.



In 1968, Kainji Lake was created by the construction of the Kainji Dam. The Niger River, the third longest in Africa, enters the lake in the north.&nbsp;



According to <a href="https://www.earth.com/news/rivers-in-the-american-west-are-a-lifesaving-resource-for-birds/">ESA</a>, the creation of the lake submerged Foge Island and the town of Bussa and permanently flooded other riverine settlements, leaving around 50,000 people displaced.&nbsp;



Large parts of Foge Island are temporarily exposed during low water tides, and the land is often used by migrating fishermen. Kainji Dam is a dam across the Niger River in Niger State of Central Nigeria. 



Wild mammals occur at relatively low densities due to illegal hunting. Lake Kainji has suffered a dramatic decline as a fishery due to the high numbers of artisanal and subsistence fisherfolk using the lake. It has been suggested that a period of closure, together with controlled fishing rights may help improve fish stocks.



Kainji Lake National Park is the oldest of its kind in Nigeria. The park contains three distinct areas: a part of the Kainji Lake, the Borgu Game Reserve to the west of the lake, and the Zugurma Game Reserve to the southeast. The park is home to around 65 mammal species, 350 bird species, and 30 species of reptiles and amphibians. 



Video/ Image Credit: European Space Agency&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Kainji Lake in north central Nigeria

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Today’s Video of the Day from <a href="https://www.igb.illinois.edu/">Carl R. Woese Institute for Genomic Biology</a> reveals how scientists can modify common crops like soybean, rice, and wheat to protect them from heat stress.



“We need to double crop production by 2050 to feed a growing global population, and not only are we not on track to do that, but climate change is further complicating things,” said Amanda Cavanagh, a lecturer at the University of Essex. 



The study is part of Realizing Increased Photosynthetic Efficiency (RIPE), an international research project that aims to develop food crops that turn the sun’s energy into food more efficiently.



“Using an engineering approach we designed multiple alternative metabolic pathways to photorespiration. Testing them in the field showed increases in productivity which led Amanda to significantly move the project forward by showing our engineered plants can withstand pretty extreme temperature stress,” said study co-author and RIPE researcher Paul South.&nbsp;



“As the climate changes and temperature stresses increase the pressure on our global food supply, farmers will need every tool available including engineering approaches like the synthetic biology used here to maintain safe and productive harvests.”



The experts tested plants modified to have more efficient photorespiration to see if they were better adapted to warmer temperatures.&nbsp;



The team found that the engineered plants produced 26 percent more biomass than the wild-type plants exposed to the same temperatures, and had 15 percent less yield loss under the higher temperatures.



Video Credit: Amanda Nguyen/University of Illinois



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Designing crops that can beat the heat

[sendtonews key="QGPzYnXEtN-1712599-12187" type="single"] Today’s Video of the Day from Carl...

This incredible image shows the aftermath of a <a href="https://www.earth.com/image/california-landslide-buries-highway/">landslide</a> in southern Kyrgyzstan. It was captured by the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a>. The landslide occurred in April 2017 just outside the village of Kurbu-Tash in southern Kyrgyzstan, which is an area that is prone to frequent dangerous landslides.

Landslide in Southern Kyrgyzstan

This image features a beautiful coral reef in the <a href="https://www.earth.com/news/gulf-of-mexico-dead-zone/">Gulf of Mexico</a> captured by the <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a>. The reef is located roughly 60 miles north of Progresso, Mexico and owns the title of the largest coral structure in the southern Gulf. In 1994, the area was named a National Park of Mexico, and in 2006, it became designated as a <a href="http://www.unesco.org/mabdb/br/brdir/directory/biores.asp?code=MEX+17&amp;mode=all">UNESCO biosphere reserve</a>.