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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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

Haze pollution is an environmental crisis in Thailand

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

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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The ice giant Uranus in stunning detail

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

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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Bomb cyclone rapidly intensified in the Pacific Northwest

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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Spiral galaxy NGC 1559 is a loner in outer space

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

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



<p>The gas that fuels <a href="https://www.earth.com/news/black-hole-is-starving-its-host-galaxy-of-star-forming-fuel/" target="_blank" rel="noreferrer noopener">star formation</a> can be used up, or it can be heated and pushed out of galaxies by supernovae or black holes, reducing the galaxy's ability to form new stars.</p>



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



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



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



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



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



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



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



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



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NGC 1792: A galactic powerhouse 

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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Fedchenko Glacier in the Pamir Mountains

Typhoon Ponsona Near Northern Mariana Islands.  Therefore at the time these images were acquired on December 8 and 10, 2002, Super Typhoon Pongsona was descending from its peak strength. Also a Category 4. Therefore with winds of 120 knots (1 knot = 1.15 mph) to Category 3, with winds around 100 knots. The image from the 8th is of Pongsona over the Northern Mariana Islands in the western Pacific Ocean, just south of the Tropic of Cancer, and about 1500 kilometers north of Papua New Guinea. In the image from the 10th, Pongsona had moved northeast, out into the open Pacific.
Pongsona had dissipated four times before reaching Typhoon level, and gained a level approximately every day, up to Category 4. However, the descent was quicker. By late on the 9th, Pongsona began losing power, and by the 11th had dropped to the lowest level, Category 1, with winds of 75 knots. After this, it dissipated for good.

Typhoon Pongsona was the last typhoon of the 2002 Pacific <a href="https://en.wikipedia.org/wiki/Typhoon_Pongsona">typhoon</a> season, and was the second costliest United States disaster in 2002, only behind Hurricane Lili. The name "Pongsona" was contributed by North Korea for the Pacific tropical cyclone list and is the Korean name for the garden balsam. Pongsona developed out of an area of disturbed weather on December 2, and steadily intensified to reach typhoon status on December 5. On December 8 it passed through <a href="http://www.earth.com/image/island-guam-clear-day/">Guam</a> and the Northern Mariana Islands while near its peak winds of 175 km/h (110 mph 10-min). It ultimately turned to the northeast, weakened, and became extratropical on December 11

Credit: <a href="https://visibleearth.nasa.gov/view.php?id=63565">Jacques Descloitres, MODIS Rapid Response Team, NASA/GSFC</a>

Typhoon Ponsona Near Northern Mariana Islands

<p>The Red Planet has always been a subject of intrigue and fascination. Recent research led by Curtin University has added more fuel to this age-old curiosity. The scientists discovered what could possibly be the oldest evidence of hot water activity on Mars.</p>



<p>This discovery opens up possibilities that at some point in its mysterious past, Mars may have been a place where life could exist.</p>



<h2 class="wp-block-heading" id="h-hot-water-on-mars">Hot water on Mars</h2>



<p>The study focused on a zircon grain from the renowned <a href="https://www.earth.com/news/hidden-water-found-on-mars-would-cover-the-planet-over-one-mile-deep/" target="_blank" rel="noreferrer noopener">Martian</a> meteorite NWA7034, fondly known as Black Beauty. This tiny grain, although no larger than a grain of sand, holds secrets dating back billions of years.</p>



<p>The analysis of the 4.45 billion-year-old zircon grain revealed geochemical fingerprints of ancient water-rich fluids. These traces of the past suggest that hot water was once present on Mars.</p>



<p>Dr. Aaron Cavosie from Curtin's <a href="https://www.curtin.edu.au/about/learning-teaching/science-engineering/school-of-earth-and-planetary-sciences/" target="_blank" rel="noreferrer noopener">School of Earth and Planetary Sciences</a> noted that this discovery opens new paths for understanding early Martian hydrothermal systems and the planet's past habitability.</p>



<p>"We used nano-scale geochemistry to detect elemental evidence of hot water on Mars 4.45 billion years ago," said Dr. Cavosie.</p>



<h2 class="wp-block-heading" id="h-early-conditions-on-mars">Early conditions on Mars</h2>



<p>Hydrothermal systems are vital for the development of life. They were crucial for life to flourish on Earth. Dr. Cavosie noted that the same essential ingredients for habitable environments were present on <a href="https://www.earth.com/news/meteorite-that-struck-mars-reveals-when-the-planet-had-liquid-water/" target="_blank" rel="noreferrer noopener">Mars</a> during its early crust formation period. </p>



<p>The team utilized nano-scale imaging and spectroscopy to identify essential elements on the zircon grain, including iron, aluminum, yttrium, and sodium.</p>



<p>The presence and pattern of these elements, added during the zircon's formation billions of years ago, suggest that water was present during early Martian magmatic activity. </p>



<p>This intriguing discovery indicates that during the initial stages of the Red Planet's existence, conditions were conducive to the existence of water.</p>



<h2 class="wp-block-heading" id="h-resilience-of-mars-crust">Resilience of Mars' crust</h2>



<p>The study also highlighted the resilience of Mars' crust. Despite enduring massive meteorite impacts, causing upheaval of its surface, Mars still had <a href="https://www.earth.com/news/mars-lost-most-of-its-water-but-where-did-it-go/" target="_blank" rel="noreferrer noopener">water</a> during the early Pre-Noachian period, which was before about 4.1 billion years ago.</p>



<p>In 2022, Curtin researchers studied the same zircon grain. They found that it had been "shocked" by a meteorite impact, marking it as the first and only known shocked zircon from Mars.</p>



<h2 class="wp-block-heading" id="h-implications-for-life-on-mars">Implications for life on Mars</h2>



<p>The discovery of ancient hydrothermal activity on Mars significantly changes our understanding of the planet's potential for life. Hydrothermal systems could have created environments rich in chemical energy and nutrients vital for life.</p>



<p>The presence of warm, mineral-laden waters in Mars' crust could have served as a cradle for microbial communities, much like the hydrothermal vents on Earth harbor diverse ecosystems despite the absence of sunlight. </p>



<p>This implies that if life ever existed on early Mars, hydrothermal systems may have been havens, providing conditions to support some form of life.</p>



<p>The research offers valuable insights into planetary habitability within our solar system and beyond.</p>



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



<p>The revelations from the zircon grain continue to ignite curiosity and lay the groundwork for future Mars exploration missions. </p>



<p>Planetary scientists are eager to explore other ancient Martian rocks and meteorites that might hold additional clues about Mars' hydrothermal systems and geological history. </p>



<p>Missions equipped with advanced technology could further investigate the surface and subsurface of Mars, searching for more evidence of past water activity and potential biological markers.</p>



<p>These future efforts could significantly enhance our understanding of the <a href="https://www.earth.com/news/mars-vanishing-water-mystery-new-insights-curiosity-rover/" target="_blank" rel="noreferrer noopener">Red Planet</a> and refine our search for life beyond Earth, spurring innovative technologies and methodologies in planetary science research.</p>



<h2 class="wp-block-heading" id="h-early-mars-and-its-water-activity">Early Mars and its water activity</h2>



<p>This recent study builds on previous research, taking us a step closer to understanding what early Mars was like. </p>



<p>According to Dr. Cavosie, identifying the signs of water-rich fluids from the zircon's formation period provides geochemical markers of water in the oldest known Martian crust.</p>



<p>The research was conducted by scientists from Curtin’s Space Science and Technology Centre, the John de Laeter Centre, and the <a href="https://www.adelaide.edu.au" target="_blank" rel="noreferrer noopener">University of Adelaide</a>. </p>



<p>Dr. Jack Gillespie is the lead author of the paper detailing study, which is set to be published in the journal <a href="https://www.science.org/doi/10.1126/sciadv.adq3694" target="_blank" rel="noreferrer noopener"><em>Science Advances.</em></a></p>



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Discovery: Ancient Mars had hot water that could have supported life

The Red Planet has always been a subject of intrigue...

<p>Giraffes, the world's tallest animals, are facing a serious crisis. </p>



<p>From urbanization to poaching, habitat loss and climate change-induced droughts, the long-necked wonders have been encountering challenges that have sent their populations on a rapid downward spiral.</p>



<p>This alarming speed of decline has prompted US wildlife officials to step in, with a proposal targeted at securing the future of many giraffe species.</p>



<h2 class="wp-block-heading" id="h-proposal-for-giraffe-protection">Proposal for giraffe protection</h2>



<p>In a remarkable move, the U.S. Fish and Wildlife Service has suggested classifying various giraffe species under the <a href="https://www.earth.com/news/nasa-is-tracking-endangered-animal-habitats-from-space/" target="_blank" rel="noreferrer noopener">endangered</a> or threatened groups. </p>



<p>This would mark the first time these African natives enjoy federal protections under the Endangered Species Act.</p>



<p>Being classified as "endangered" signals an immediate risk of <a href="https://www.earth.com/news/earth-may-be-enduring-its-seventh-mass-extinction-not-sixth/" target="_blank" rel="noreferrer noopener">extinction</a>, and represents the highest level of threat under the Act.</p>



<p>On the other hand, a "threatened" tag indicates that the species is on track towards endangerment within a predictable timeframe in the future.</p>



<h2 class="wp-block-heading" id="h-federal-protections-for-giraffes">Federal protections for giraffes</h2>



<p>"Federal protections for giraffes will help protect a vulnerable species, foster <a href="https://www.earth.com/news/scientists-climate-change-and-biodiversity-loss-are-one-indivisible-global-health-crisis/" target="_blank" rel="noreferrer noopener">biodiversity</a>, support ecosystem health, combat wildlife trafficking, and promote sustainable economic practices," explained Martha Williams, the director of <a href="https://www.fws.gov/" target="_blank" rel="noreferrer noopener">US Fish and Wildlife Service</a>. </p>



<p>"This action supports <a href="https://www.earth.com/news/world-giraffe-day-2024-a-towering-celebration-of-the-gentle-giants/" target="_blank" rel="noreferrer noopener">giraffe conservation</a> while ensuring the United States does not contribute further to their decline." </p>



<h2 class="wp-block-heading" id="h-endangered-and-threatened-sub-species">Endangered and threatened sub-species</h2>



<p>The officials have proposed to include three subspecies of the Northern giraffe under the endangered category.</p>



<p>This includes the West African, Kordofan, and Nubian subspecies, which have seen a dramatic reduction of about 77% in their populations since 1985. Their numbers have decreased from 25,653 individuals to just 5,919.</p>



<p>Moreover, in East Africa, two subspecies, commonly known as the reticulated and Masai giraffes, are up for consideration to be listed as "threatened."</p>



<h2 class="wp-block-heading" id="h-america-s-role-in-the-giraffe-trade">America's role in the giraffe trade</h2>



<p>America has emerged as a significant market for giraffe parts and products, with 40,000 being imported in a decade, according to a 2018 report.</p>



<p>In addition, American hunters traveling to Africa for <a href="https://www.earth.com/news/does-hunting-fishing-connect-humans-with-nature-or-reinforce-superiority-complex/" target="_blank" rel="noreferrer noopener">hunting</a> and the acquisition of a trophy means that the imported giraffe body parts have also contributed to the crisis.</p>



<p>“These gentle giants are suffering a silent extinction, and Endangered Species Act safeguards will curb US imports of giraffe skins and other body parts,” said Tanya Sanerib, international legal director at the Center for Biological Diversity. </p>



<p>Recent data, from 2022, “shows everything coming into the US, from giraffe tails and skulls to lots of skins, leather products, bones, bone carvings, of course hunting trophies, giraffe feet, giraffe rugs and giraffe jewelery,” stated Sanerib.</p>



<h2 class="wp-block-heading" id="h-pressures-on-stressed-populations">Pressures on stressed populations </h2>



<p>Meanwhile in Africa, the home of these gentle giants, frequent droughts have been causing havoc, leading to crop failures, livestock losses, and a dire need for food and water.</p>



<p>This has been putting additional pressure on the already stressed populations of giraffes.</p>



<p>Should this proposed rule come into action, it would curb illegal hunting and trade of giraffes by mandating a permit for importing the animal's body parts into the US. </p>



<p>Fees from the permits will provide funding for research and giraffe conservation efforts.</p>



<h2 class="wp-block-heading" id="h-global-conservation-efforts-for-giraffes">Global conservation efforts for giraffes</h2>



<p>Since 2017, several environmental groups have been urging federal officials to introduce protections for the species. </p>



<p>The agency will now collect public comments on the proposal until February 19, 2025, and hopes to finalize the action plan within a year, paving the way for better and brighter days for the world's tallest animals.</p>



<p>While the U.S. proposal to classify giraffes under the Endangered Species Act is a milepost, conservation work for these beautiful animals is underway across the globe.</p>



<p>In various parts of Africa, governments and conservation organizations have instigated anti-poaching patrols, community-led habitat restoration initiatives, and educational campaigns in an effort to reduce human-wildlife conflict.</p>



<p>The protection strategy of Giraffe Conservation, for example, works with local communities to monitor giraffe populations and create protected corridors that allow these animals to move freely across fragmented landscapes.</p>



<p>Collaborative international efforts are crucial, as giraffes cross multiple boarders and face varied threats across their vast ranges. </p>



<h2 class="wp-block-heading" id="h-ecological-role-of-giraffes">Ecological role of giraffes</h2>



<p>Beyond their iconic status as the world’s tallest animals, the giraffe has a major ecological role to play in its ecosystems.</p>



<p>Giraffes function as browsers and thus keep African savannas and woodlands in balance by restricting overgrowth and spreading seeds via their droppings. They are also sometimes prey to top predators.</p>



<p>Their decline could be devastating for other wildlife species and plant life throughout the ecosystems.</p>



<p>The giraffes are a focus of ecotourism, which also represents a source of income for local people. </p>



<p>Saving giraffes does not only mean saving a single species; rather, it involves conserving the sensitive balance of ecosystems in which they live. </p>



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Giraffes are suffering a 'silent extinction' and need more protection

Giraffes, the world's tallest animals, are facing a serious crisis....

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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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



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Magnetic North Pole is moving and changing faster than ever, surprising scientists

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

<p>The Chinese Mars rover Zhurong is adding an exciting twist to the story and history of water on Mars. </p>



<p>After landing in southern Utopia Planitia on Mars in May 2021, the now-defunct Zhurong rover went to work exploring the Martian surface, and its latest findings might just change the way we think about the Red Planet.</p>



<p>Bo Wu and a team of researchers from <a href="https://www.polyu.edu.hk/en/" target="_blank" rel="noreferrer noopener">Hong Kong Polytechnic University</a> believe they've found compelling evidence of an ocean shoreline for a massive body of water that once covered Mars' northern lowlands.</p>



<h2 class="wp-block-heading" id="h-what-is-the-zhurong-mars-rover">What is the Zhurong Mars rover?</h2>



<p>The Zhurong rover is <a href="https://www.earth.com/news/china-plans-to-inhabit-a-space-station-on-the-moon-by-2030/" target="_blank" rel="noreferrer noopener">China's first foray</a> into Martian exploration, landing successfully on Mars in May 2021 as part of the <a href="https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=2020-049A" target="_blank" rel="noreferrer noopener">Tianwen-1</a> mission. </p>



<p>Weighing around 240 kilograms (530 lbs) -- about the size of a small car -- Zhurong is packed with scientific instruments, including navigation and topography cameras, a multispectral camera for analyzing surface materials, and a ground-penetrating radar that can probe up to 100 meters beneath the surface. </p>



<p>These tools allow Zhurong to capture detailed images, study the composition of rocks and soil, and investigate the planet's subsurface structures.</p>



<p>What sets Zhurong apart is its ability to study Mars both above and below ground. The ground-penetrating radar is particularly exciting because it helps scientists search for signs of water ice and understand the geological layers hidden <a href="https://www.earth.com/news/does-life-exist-below-the-icy-surface-of-mars/" target="_blank" rel="noreferrer noopener">beneath the surface.</a> </p>



<p>The rover also carries instruments to examine <a href="https://www.earth.com/news/the-internal-structure-of-mars-core-is-finally-revealed/" target="_blank" rel="noreferrer noopener">Mars' magnetic field</a> and atmospheric conditions, contributing valuable data to our understanding of the planet's climate and potential for habitability.</p>



<h2 class="wp-block-heading" id="h-zhurong-sees-water-related-features-on-mars">Zhurong sees water-related features on Mars</h2>



<p>For years, scientists have pondered the possibility of a vast ocean on Mars, especially during the Hesperian period about 3.7 billion years ago. Concrete proof, however, has been hard to come by. </p>



<p>Using a mix of Zhurong's onboard cameras and ground-penetrating radar, plus remote sensing data from orbiting satellites, the team identified several intriguing water-related features around the rover's landing area.</p>



<figure class="wp-block-image aligncenter size-full"><a href="https://www.earth.com/wp-content/uploads/2024/11/Zhurong-mars-rover_china_landing-site_ocean-shore_Sci-Reports_1m.jpg" target="_blank" rel="noreferrer noopener"><img src="https://www.earth.com/wp-content/uploads/2024/11/Zhurong-mars-rover_china_landing-site_ocean-shore_Sci-Reports_1s.webp" alt="The Zhurong landing site (red cross) shown on the geologic map by Tanaka et al. Regions of different colors indicate different geologic units. The red box shows the study area, covering an area of ~ 1800 km × 800 km. The thick black line is the Deuteronilus contact indicating a possible shoreline across the region. The background map is a shaded relief of the MOLA topography." class="wp-image-1951081"/></a><figcaption class="wp-element-caption"><em>The Zhurong landing site (red cross) shown on the geologic map by Tanaka et al. Regions of different colors indicate different geologic units. The red box shows the study area, covering an area of ~ 1800 km × 800 km. The thick black line is the Deuteronilus contact indicating a possible shoreline across the region. The background map is a shaded relief of the MOLA topography.</em></figcaption></figure>



<p>Since touching down, Zhurong has traveled about 1.2 miles, studying the geology of its surroundings in search of signs of water or ice. </p>



<p>The features spotted include crater-like pitted cones, troughs, sediment channels, and <a href="https://www.earth.com/news/water-frost-detected-on-mars-enormous-volcanoes/" target="_blank" rel="noreferrer noopener">mud volcano formations</a>. If that sounds like the remnants of a beachfront, you're onto something. </p>



<p>According to Bo Wu and his colleagues, these formations are consistent with what you'd expect to find in a nearshore zone, suggesting this area was once a coastline.</p>



<h2 class="wp-block-heading" id="h-dating-the-martian-ocean">Dating the Martian ocean</h2>



<p>Based on the composition of surface deposits, the team estimates that the ocean likely existed around 3.68 billion years ago. </p>



<p>"The water was heavily silted, forming the layering structure of the deposits," study co-author Sergey Krasilnikov of the Hong Kong Polytechnic University told Reuters. </p>



<p>This silt-laden water would have created distinct sedimentary layers, much like those found in ancient seabeds on Earth.</p>



<p>Interestingly, the researchers propose that after forming, the ocean froze over for about 10,000 to 100,000 years -- a mere <a href="https://www.earth.com/news/when-was-mars-habitable-much-more-recently-than-we-thought/" target="_blank" rel="noreferrer noopener">blink in geological terms</a>. </p>



<p>This freezing period etched out the coastline features observed today before the ocean eventually dried up roughly 260 million years later. Imagine a vast frozen ocean, sitting quietly on Mars, waiting for its turn to disappear.</p>



<h2 class="wp-block-heading" id="h-not-everyone-agrees">Not everyone agrees</h2>



<p>However, not everyone is jumping on the bandwagon. </p>



<p>Benjamin Cardenas of <a href="https://www.psu.edu/" target="_blank" rel="noreferrer noopener">Pennsylvania State University</a> points out that erosion over billions of years would likely have erased such delicate features. It's a fair concern -- Mars isn't exactly a place where things stay preserved forever. </p>



<p>Wu acknowledges this skepticism but suggests that asteroid impacts might have resurfaced portions of the shoreline, making them detectable today.</p>



<h2 class="wp-block-heading" id="h-implications-for-martian-life">Implications for Martian life</h2>



<p>So, what does all this mean in the grand scheme of things? Well, the presence of an ancient ocean has profound implications for <a href="https://www.earth.com/news/meteorite-that-struck-mars-reveals-when-the-planet-had-liquid-water/" target="_blank" rel="noreferrer noopener">our understanding of Mars</a>. </p>



<p>Water is a key ingredient for life as we know it. If Mars had oceans, could it have also hosted life? It's a tantalizing thought that keeps scientists up at night.</p>



<p>NASA's Insight Lander </p>



<p>Adding another layer to the mystery, <a href="https://science.nasa.gov/mission/insight/" target="_blank" rel="noreferrer noopener">NASA's Insight lander</a> found that a significant amount of water had seeped into Mars's crust. </p>



<p>"At least we have identified a place that should, in principle, be able to sustain life," Michael Manga of the <a href="https://www.universityofcalifornia.edu/" target="_blank" rel="noreferrer noopener">University of California</a>, one of the study authors, said in a previous statement. </p>



<p>This underground water could have provided a stable environment for <a href="https://www.earth.com/news/insights-alien-life-mars-water-sulfur-discovered-gained-studying-extreme-life-earth/" target="_blank" rel="noreferrer noopener">life to develop</a>.</p>



<h2 class="wp-block-heading" id="h-what-s-next-for-zhurong-and-mars-water">What's next for Zhurong and Mars water?</h2>



<p>But here's the kicker: to get definitive answers, we need to bring Martian samples back to Earth for detailed analysis. </p>



<p>China's Tianwen 3 Mars sample return mission aims to do just that by 2031, potentially beating NASA's own sample return mission to the punch. </p>



<p>If all goes according to plan, we'll have pieces of Mars right here on Earth in less than a decade.</p>



<p>As we await these missions, Zhurong continues to send valuable data, inching us closer to understanding the Red Planet's watery past. </p>



<p>Could Mars have been teeming with life billions of years ago? It's the million-dollar question. Only time -- and more research -- will tell.</p>



<p>The full study was published in the journal <em><a href="https://www.nature.com/articles/s41598-024-75507-w" target="_blank" rel="noreferrer noopener">Scientific Reports</a></em>.</p>



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China’s Mars Zhurong rover finds an ocean shoreline on the Red Planet

The Chinese Mars rover Zhurong is adding an exciting twist...

<p>Uranus has long captivated scientists with its mysteries, particularly those that remain hidden within our solar system. </p>



<p>Decades-old data from Voyager 2, a NASA spacecraft, has now breathed new life into our understanding of this distant, enigmatic planet, settling age-old questions that have puzzled researchers for years.</p>



<h2 class="wp-block-heading" id="h-basics-of-planet-uranus">Basics of planet Uranus</h2>



<p>Uranus is the seventh planet from the Sun, and it has this wild tilt -- it's basically spinning on its side with an axis tilt of about 98 degrees. </p>



<p>This unique tilt leads to some extreme seasons that last over 20 Earth years each. The planet's blue-green hue comes from methane in its atmosphere, which absorbs red light and reflects blue, giving it that cool color.</p>



<p>Uranus has a set of rings and 27 known moons, most of which are named after characters from Shakespeare's plays. While its rings aren't as flashy as Saturn's, they're still pretty interesting.</p>



<p> And talk about cold -- Uranus has the coldest planetary atmosphere in the solar system, dipping down to -224 degrees Celsius (-371 Fahrenheit). </p>



<p>Finally, it takes about 84 Earth years to complete one orbit around the Sun, so a single year on Uranus is basically a lifetime for the average human.</p>



<h2 class="wp-block-heading" id="h-voyager-2-meets-uranus">Voyager 2 meets Uranus</h2>



<p>In 1986, Voyager 2 embarked on a momentous journey that brought it into close proximity with Uranus, providing the first -- and so far, only -- detailed examination of this unique, sideways-rotating planet.</p>



<p>This flyby not only unveiled new moons and rings but also introduced perplexing enigmas that challenged the scientific community. </p>



<p>Solving these mysteries and understanding their broader implications is akin to piecing together a cosmic puzzle.</p>



<h2 class="wp-block-heading" id="h-unexplained-oddities-of-uranus">Unexplained oddities of Uranus</h2>



<p>The presence of energized particles around Uranus was a conundrum. Here was a planet, rotating on its side and challenging the established understanding of how <a href="https://www.earth.com/news/milky-way-galaxy-is-surrounded-by-massive-magnetic-fields/" target="_blank" rel="noreferrer noopener">magnetic fields</a> trap particle radiation. </p>



<p>Uranus, known for its unusual properties, was once again surprising the experts.</p>



<p>Scientists re-analyzed data from the notable flyby a few decades ago and, in an exciting twist, identified that an unexpected, cosmic occurrence had thrown this distant planet a curveball.</p>



<p>The experts discovered that, just before the spacecraft’s flyby, <a href="https://www.earth.com/news/space-weather-poses-significant-risks-to-railway-safety/" target="_blank" rel="noreferrer noopener">space weather</a> had peculiarly squashed the planet’s magnetic field, leading to a dramatic compression of Uranus' magnetosphere.</p>



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



<p>“The spacecraft saw Uranus in conditions that only occur about 4% of the time,” stated Jamie Jasinski, a scientist based at <a href="https://www.jpl.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA’s Jet Propulsion Laboratory</a> in Southern California and the lead author of a new study published in <a href="https://www.nature.com/articles/s41550-024-02389-3"><em>Nature Astronomy</em></a>.</p>



<p>Imagine the odds. Had Voyager 2 arrived just a few days earlier, it would have recorded a completely different magnetosphere around Uranus.</p>



<h2 class="wp-block-heading" id="h-mysteries-of-the-magnetosphere">Mysteries of the magnetosphere</h2>



<p>Earth's <a href="https://www.earth.com/news/mysterious-solar-shockwave-has-cracked-earths-magnetosphere/" target="_blank" rel="noreferrer noopener">magnetosphere</a> plays a crucial role in maintaining life on our planet by protecting us from the ionized gas jets that the Sun releases.</p>



<p>Comprehending how magnetospheres operate carries immense significance not just for us, but for understanding the distant, less-explored planets in our solar system.</p>



<p>In their quest to understand Uranus' magnetosphere, scientists were confused by what they witnessed in the <a href="https://www.earth.com/news/nasa-lost-contact-with-voyager-2-spacecraft-12-billion-miles-away/" target="_blank" rel="noreferrer noopener">Voyager 2</a> data. </p>



<p>Despite a marked absence of plasma, the planet's magnetosphere boasted electron radiation belts with an intensity second only to the notorious radiation belts of Jupiter. </p>



<p>This posed an enigma, as the Uranian moons, which should have been a significant source of water ions, were believed to be inactive.</p>



<h2 class="wp-block-heading" id="h-unexpected-solar-wind-event">Unexpected solar wind event</h2>



<p>The latest data analysis suggests that the solar wind, a flow of charged particles released from the Sun's upper atmosphere, could be the key to solving this puzzle.</p>



<p>It is possible that, as the solar wind compressed the planet's magnetosphere, it also drove the plasma out of the system.</p>



<p>The intensity of the solar wind event could have increased the magnetosphere's dynamics, thereby providing a source for the radiation belts.</p>



<p>This discovery has led researchers to speculate that the five major moons of Uranus might be geologically active, contradicting previous beliefs. </p>



<p>They suggest that these moons could have been continually spewing ions into the surrounding magnetosphere.</p>



<h2 class="wp-block-heading" id="h-renewed-focus-on-uranus-and-future-exploration">Renewed focus on Uranus and future exploration</h2>



<p>The National Academies’ 2023 Planetary Science and Astrobiology Decadal Survey has highlighted the study of Uranus as a key objective for future NASA missions.</p>



<p>Linda Spilker from the JPL, who was involved in the Voyager 2 mission, elaborated on the findings.</p>



<p>“The flyby was packed with surprises, and we were searching for an explanation of its unusual behavior. The magnetosphere Voyager 2 measured was only a snapshot in time," said Spilker.</p>



<p>"This new work explains some of the apparent contradictions and will once again change our view of Uranus." </p>



<h2 class="wp-block-heading" id="h-the-legacy-of-voyager-2">The legacy of Voyager 2</h2>



<p>Despite being billions of miles away, Voyager 2 continues to communicate with Earth using NASA's Deep Space Network, specifically via the antenna in Canberra, Australia. </p>



<p>It is still operational, collecting data on the interstellar medium and is expected to continue transmitting data until at least 2025​​​​​​.</p>



<p>Decades after it was launched, Voyager 2 continues to serve as a cornerstone for scientific discovery, offering invaluable insights into the mysteries of our solar system.</p>



<p>The study is published in the journal <em><a href="https://www.nature.com/articles/s41550-024-02389-3" target="_blank" rel="noreferrer noopener">Nature Astronomy</a></em>.</p>



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<p></p>

Uranus mystery finally solved almost 40 years after flyby from Voyager 2 spacecraft

Uranus has long captivated scientists with its mysteries, particularly those...

<p>Speech often betrays us at the most inconvenient moments: we grasp for a word, knowing exactly what we mean to say, but are unable to retrieve that elusive term.</p>



<p>This experience, known as "lethologica," is a common symptom of aging but, in some cases, may also signal the early stages of Alzheimer's Disease, long before more obvious signs appear.</p>



<h2 class="wp-block-heading" id="h-tracking-brain-health-through-speech">Tracking brain health through speech</h2>



<p>Recently, a fascinating analysis sprang from the research halls of the <a href="https://learn.utoronto.ca/" target="_blank" rel="noreferrer noopener">University of Toronto</a>. </p>



<p>Contrary to popular belief, they found that the speed of speech is more diagnostic of neurological health than the inability to retrieve words.  </p>



<p>Studying a group of 125 adults - aged 18 to 85 - the researchers asked them to describe a scene in as much detail as they could.</p>



<p>The responses were recorded and then examined by <a href="https://www.earth.com/news/artificial-intelligence-boosts-creativity-but-reduces-variety/" target="_blank" rel="noreferrer noopener">artificial intelligence</a> software, which measured their speech speed, the length of their pauses, and the diversity in their vocabulary.</p>



<p>In addition, all participants completed a range of tests aiming to evaluate their focus, thinking speed, and task management abilities. </p>



<p>Notably, the researchers found a correlation between a participant's everyday speech pace and age-related cognitive decline in these "executive" skills, indicating a broader decline than just difficulty in finding the right word.</p>



<h2 class="wp-block-heading" id="h-a-new-lens-for-analysis">A new lens for analysis</h2>



<p>Especially noteworthy was the introduction of a unique "picture-word interference task." This method requires participants to first identify an object and then instruct their mouths to form the words.</p>



<p>Further exploring the rich tapestry of cognitive and linguistic changes that come with age, the study demonstrated a correlation between a person’s <a href="https://www.earth.com/news/neurons-can-predict-human-speech-before-we-say-a-word/" target="_blank" rel="noreferrer noopener">natural speech</a> speed and their ability to name images quickly .</p>



<p>However, to paint a more accurate picture of our verbal adaptability, it would be beneficial to combine the results of picture-naming tests with "verbal fluency tasks" that require participants to produce as many words as possible within a short time from a given category or starting with a specific letter.</p>



<p>Such tasks are better indicators of everyday conversations as they involve active retrieval and production of words from one's vocabulary.</p>



<h2 class="wp-block-heading" id="h-speech-and-cognitive-decline">Speech and cognitive decline</h2>



<p>Verbal fluency tasks have another crucial function: they serve as markers of <a href="https://www.earth.com/news/food-for-the-aging-brain-mediterranean-diet-protects-cognitive-health/" target="_blank" rel="noreferrer noopener">cognitive health</a>. </p>



<p>Age-related changes in word retrieval ability are perfectly normal, but struggling disproportionately on these tests may be an early sign of neurodegenerative diseases like Alzheimer's.</p>



<p>To take their research even further, the Toronto team might consider gauging participants' personal experiences of word-finding difficulties in addition to the objective measures like speech pauses. </p>



<p>These personal narratives could give added perspective on the cognitive processes at play.</p>



<h2 class="wp-block-heading" id="h-looking-to-the-future">Looking to the future</h2>



<p>This study is a significant stride forward, and reveals that our cognitive health can be gauged not just by what we say, but also by how quickly we say it.</p>



<p>By harnessing our ever-advancing natural <a href="https://www.earth.com/news/caregiver-speech-shapes-infant-language-development/" target="_blank" rel="noreferrer noopener">language</a> processing technologies to detect changes in speech rate, we can identify people at risk before more severe symptoms appear.</p>



<h2 class="wp-block-heading" id="h-monitoring-brain-health-through-speech">Monitoring brain health through speech </h2>



<p>The study highlights the growing importance of speech as a marker for understanding how the brain changes with age. </p>



<p>Unlike traditional cognitive tests that rely on deliberate responses, natural speech offers an organic reflection of underlying cognitive processes.</p>



<p>The researchers found that everyday <a href="https://www.earth.com/news/songbirds-and-humans-use-similar-speech-patterns/" target="_blank" rel="noreferrer noopener">speech patterns</a> - such as the speed of delivery, the length of pauses, and the diversity of vocabulary - provide valuable clues about a person's executive functioning and processing ability.</p>



<p>What makes speech analysis particularly compelling is its accessibility, as conversations are a part of daily life. Analysis of speech is thus a low-cost, non-invasive method for monitoring brain health.</p>



<p>This approach not only reduces the barriers to early detection but also opens the door for widespread use in community health settings. </p>



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



<p>By leveraging speech, healthcare providers may identify early signs of cognitive decline in aging populations without the need for specialized equipment.</p>



<p>Furthermore, speech-based assessments have the potential to complement other diagnostic tools. When paired with imaging techniques or genetic testing, they can provide a more complete picture of an individual's cognitive trajectory.</p>



<p>This multi-faceted approach ensures a more personalized understanding of aging and neurological health, and may lay the groundwork for proactive care strategies in the fight against Alzheimer’s and other neurodegenerative diseases.</p>



<p>The study is published in the journal <em><a href="https://www.tandfonline.com/doi/full/10.1080/13825585.2024.2315774" target="_blank" rel="noreferrer noopener">Taylor and Francis online</a></em>.</p>



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



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<p>Check us out on <a href="https://www.earth.com/earthsnap/" target="_blank" rel="noreferrer noopener">EarthSnap</a>, a free app brought to you by <a href="https://www.earth.com/author/eralls/" target="_blank" rel="noreferrer noopener">Eric Ralls</a> and Earth.com.</p>



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



<p></p>

How speech speed can signal brain health

Speech often betrays us at the most inconvenient moments: we...

<p>A recent capture by the powerful European Southern Observatory’s Very Large Telescope Interferometer (ESO’s VLTI) has enabled researchers to view the scene of a lifetime -- a first-ever close-up image of a dying star outside of our galaxy.</p>



<p>This celestial spectacle details the dramatic death throes of a giant star, named WOH G64, that is situated in a galaxy beyond our Milky Way. </p>



<h2 class="wp-block-heading" id="h-dying-star-s-last-breath">Dying star's last breath</h2>



<p>Keiichi Ohnaka, an astrophysicist at <a href="https://www.unab.cl/en/" target="_blank" rel="noreferrer noopener">Universidad Andrés Bello</a> in Chile, shared the exciting news.</p>



<p>Ohnaka and his team found an egg-shaped shell of dust and gas surrounding WOH G64 -- a dying star about 160,000 light-years away from us.</p>



<p>“We are excited because this may be related to the drastic ejection of material from the dying <a href="https://www.earth.com/news/supernova-dandelion-year-1181-leaves-behind-zombie-star-defying-death/" target="_blank" rel="noreferrer noopener">star</a> before a supernova explosion,” said Ohnaka.</p>



<h2 class="wp-block-heading" id="h-tale-of-the-behemoth-star">Tale of the "behemoth star"</h2>



<p>For decades, astronomers referred to WOH G64 as the "behemoth star."</p>



<p>It is located in the Large Magellanic Cloud, a small galaxy that orbits our Milky Way. With its humongous size, around 2,000 times that of our own sun, WOH G64 is a red supergiant star.</p>



<p>Viewing such stars that are hidden in far-off galaxies has been a challenge until now, but ESO’s VLTI’s sharpness has brought WOH G64 to our virtual doorstep.</p>



<h2 class="wp-block-heading" id="h-observing-a-dying-star">Observing a dying star</h2>



<p>Ohnaka and his team at Universidad Andrés Bello have long been intrigued by WOH G64. The researchers first used observations from ESO's VLTI in 2005 and 2007 in Chile's Atacama Desert.</p>



<p>Despite their persistent efforts, the actual image of the star remained elusive until the development of one of VLTI's second-generation instruments known as GRAVITY.</p>



<h2 class="wp-block-heading" id="h-significant-changes-in-woh-g64">Significant changes in WOH G64 </h2>



<p>GRAVITY allowed the team to examine WOH G64 with a fresh pair of eyes, leading them to a surprising discovery. Over the last decade, the star has dimmed considerably.</p>



<p>Study co-author Gerd Weigelt is an astronomy professor at the Max Planck Institute for Radio Astronomy in Bonn, Germany.</p>



<p>"We have found that the <a href="https://www.earth.com/news/how-earth-will-meet-its-demise-astronomers-witness-a-star-devour-a-planet/" target="_blank" rel="noreferrer noopener">star</a> has been experiencing a significant change in the last 10 years, providing us with a rare opportunity to witness a star’s life in real-time,” said Weigelt.</p>



<h2 class="wp-block-heading" id="h-shedding-layers-of-gas-and-dust">Shedding layers of gas and dust</h2>



<p>Red supergiants like WOH G64 are known to discard their outer layers of gas and dust in a process that spans thousands of years. </p>



<p>The team suspects that the dimming of the <a href="https://www.earth.com/news/binary-systems-with-living-and-dead-stars-reveal-stellar-secrets/" target="_blank" rel="noreferrer noopener">star</a> and the unexpected egg-like shape of the dust cocoon surrounding it could be due to this shedding.</p>



<p>"This star is one of the most extreme of its kind, and any drastic change may bring it closer to an explosive end," noted study co-author Jacco van Loon, director of Keele Observatory at Keele University, UK.</p>



<h2 class="wp-block-heading" id="h-looking-closely">Looking closely</h2>



<p>As the star continues to fade, capturing detailed images of it becomes increasingly challenging, even for the VLTI. </p>



<p>However, with planned upgrades like GRAVITY+, we can expect to get even better insights into the life of this far-off stellar giant.</p>



<p>“Similar follow-up observations with ESO instruments will be important for understanding what is going on in the star,” said Ohnaka, who is the lead author of the study. </p>



<h2 class="wp-block-heading" id="h-eso-s-very-large-telescope-interferometer">ESO’s Very Large Telescope Interferometer</h2>



<p>The VLTI is an impressive piece of technology that combines light collected by ESO’s Very Large Telescope array to create detailed cosmic images.</p>



<p>The process is highly complex and needs instruments specifically dedicated to this task. In 2005 and 2007, Ohnaka’s team had access to the first generation of these instruments, MIDI. </p>



<p>However, it was the second-generation instrument, GRAVITY, that made the image of WOH G64 possible. But this is just the beginning. With imminent upgrades like GRAVITY+, we're set to witness cosmic phenomena like never before.</p>



<h2 class="wp-block-heading" id="h-significance-of-capturing-a-dying-star">Significance of capturing a dying star</h2>



<p>The wondrous universe is always ready to surprise and inspire us. Today, it is the unique image of a dying <a href="https://www.earth.com/news/six-rogue-worlds-discovered-inside-a-young-star-forming-nebula/" target="_blank" rel="noreferrer noopener">star</a> beyond our galaxy, courtesy of ESO’s VLTI and the relentless curiosity of scientists like Keiichi Ohnaka.</p>



<p>In the ever-evolving field of astronomy, this is just one of the countless wonders that await us. With each star we scrutinize, each galaxy we explore, we inch closer to understanding the cosmos and our place in it. </p>



<p>The study is published in the journal <em><a href="https://www.aanda.org/articles/aa/full_html/2024/11/aa51820-24/aa51820-24.html" target="_blank" rel="noreferrer noopener">Astronomy and Astrophysics</a>.</em></p>



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



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

Astronomers reveal the first detailed image of a dying star in another galaxy

A recent capture by the powerful European Southern Observatory’s Very...

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<p>Today’s <strong>Video of the Day</strong> 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.</p>



<p>"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.</p>



<p>"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."</p>



<p><em>Video/ Image Credit: ESA</em></p>



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



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

Nushagak Bay in southwest Alaska

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

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<p>Today's <strong>Video of the Day</strong> 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.</p>



<p>"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.</p>



<p>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.</p>



<p><em>Video/ Image Credit: American Chemical Society&nbsp;</em></p>



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



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



<p>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.</p>

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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<p>Today’s <strong>Video of the Day</strong> 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;</p>



<p>"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.</p>



<p>"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."</p>



<p>"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."</p>



<p><em>Video/Image Credit: ESA&nbsp;</em></p>



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



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

Lake Trasimeno in Central Italy

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<p>Today's <strong>Video of the Day</strong> 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;</p>



<p>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;</p>



<p>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.</p>



<p><em>Video Credit: American Chemical Society&nbsp;</em></p>



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



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



<p>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.</p>

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



<p>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;</p>



<p>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;</p>



<p>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. </p>



<p>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.</p>



<p>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. </p>



<p><em>Video/ Image Credit: European Space Agency&nbsp;</em></p>



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



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



<p>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.</p>

Kainji Lake in north central Nigeria

[sendtonews key="iuA5mpp3jv-1641775-12187" type="single"] Today’s Video of the Day from the...

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<p>Today’s <strong>Video of the Day</strong> 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.</p>



<p>“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. </p>



<p>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.</p>



<p>“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;</p>



<p>“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.”</p>



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



<p>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.</p>



<p><em>Video Credit: Amanda Nguyen/University of Illinois</em></p>



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



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



<p>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.</p>

Designing crops that can beat the heat

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

<p>In these images from late 2002 and early 2003. Haze and Smog in Central China. air pollution blankets a large region of central China. The pollution gets packed into valleys between mountain ranges and along rivers, and is so thick that in places it completely obscures the surface from the satellite’s view. These images were acquired by the Moderate Resolution Imaging Spectroradiometer <a href="https://www.earth.com/image/credit-nasa-image-courtesy-the-modis-rapid-response-team-goddard-space-flight-center/">(MODIS)</a> on the Aqua and Terra satellites.</p>
<p>Central China is a geographical and a loosely defined cultural region that covers the central area of China.  Therefore This region includes the provinces of Henan, Hubei and Hunan, as Jiangxi is sometimes also regarded to be part of this region. Central China is now officially part of South Central China governed by the People&#8217;s Republic of China. In the context of the Rise of Central China Plan by the State Council of the People&#8217;s Republic of China in 2004. Also surrounding provinces including Shanxi,Anhui, are also defined as regions of <a href="https://en.wikipedia.org/wiki/Central_China">Central</a> China development zones. Also the Haze and Smog in Central China has caused much more than just natural devastation. It has also caused major health concerns for the locals in the area.</p>
<p>Credit: <a href="https://visibleearth.nasa.gov/view.php?id=63323">Jacques Descloitres, MODIS Rapid Response Team, NASA/GSFC</a></p>


Haze and Smog in Central China

These images from Sulfur Plumes off Namibia. They were taken by the Moderate Resolution Imaging Spectroradiometer <a href="http://www.earth.com/image/credit-jacques-descloitres-modis-rapid-response-team-nasagsfc/">(MODIS).</a>  Also the Terra satellite and Aqua satellite in late 2002 show the southwest African coastline centered on Namibia. Therefore the orange wash along the coast is the Namib Desert. Although  to its north is the Skeleton Coast, names for the numerous skeletons of ships (and people) that litter the shoreline.

The coast is often packed with fog, as on November 15, and the fog combined with the rough seas caused by the Benguela Current flowing up from Antarctica, make the region treacherous. In some of these images, the waters of the southern Atlantic Ocean are swirling with blues and greens. These may be due to plumes of hydrogen sulfide gas welling up from the bottom of the ocean. Therefore the Sulfur Plumes off Namibia have caused major damage and have left so many things abandoned. Namibia, the driest country in Sub-Saharan Africa, was inhabited since early times by the San, Damara and Nama people. Around the 14th century, immigrating Bantu peoples arrived as part of the Bantu expansion. Since then, the Bantu groups, the largest being the Aawambo, have dominated the population of the country; since the late 19th century, they have constituted a majority.

Credit: <a href="https://visibleearth.nasa.gov/view.php?id=64041">Jacques Descloitres, MODIS Rapid Response Team, NASA/GSFC</a>