<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>Picture yourself at a social event. As the gathering comes to a close, and you step out, a barrage of thoughts flood your mind. Did you talk excessively? Did you unintentionally offend someone with a misplaced comment? Were your companions entertained or burdened by your presence?</p>



<p>This anxiety-inducing pattern of thought might seem frustrating, but it's part of what makes us human - our brain's advanced social cognitive abilities.</p>



<p>In a scientific study led by Northwestern Medicine, researchers have investigated the intricate evolutionary aspects of this phenomenon.</p>



<p>The study suggests that the human brain's evolutionary advances in social cognition could be harnessed for future psychiatric therapies, potentially aiding those who suffer from anxiety or depression.</p>



<h2 class="wp-block-heading" id="h-lizard-brain-and-social-cognitive-abilities">Lizard brain and social cognitive abilities</h2>



<p>We often find ourselves caught up in thoughts, attempting to decipher the emotions and intentions of those around us. </p>



<p>"What is that person feeling, thinking? Did I say something to upset them?" noted senior author Rodrigo Braga. </p>



<p>This cognitive ability, however, is a recent addition to our evolutionary timeline. It involves placing oneself in another's shoes and making educated guesses about their thought process, despite not having any concrete evidence.</p>



<p>The study aimed to decipher the link between the relatively new social <a href="https://www.earth.com/news/where-does-creativity-start-in-the-brain/" target="_blank" rel="noreferrer noopener">cognitive network</a> and the ancient part of the brain called the amygdala, also known as the "lizard brain." The amygdala typically processes fear and detects threats.</p>



<p>Yet, it also governs social behaviors like parenting, mating, aggression, and social dominance hierarchies.</p>



<h2 class="wp-block-heading" id="h-ancient-and-advanced-brain-functions">Ancient and advanced brain functions</h2>



<p>The researchers found that the communication between the amygdala and the social <a href="https://www.earth.com/news/young-adult-depression-linked-to-worse-memory-skills/" target="_blank" rel="noreferrer noopener">cognitive network</a> is ongoing.</p>



<p>In particular, the medial nucleus, a specific part of the amygdala that governs social behaviors, has a connection with the newly evolved social cognitive network areas that are linked to perceiving the emotions and intentions of others.</p>



<p>This link helps shape the social cognitive network's function by granting access to the amygdala's role in processing emotionally significant content.</p>



<p>To uncover these connections, the researchers turned to a noninvasive brain-imaging technique, known as functional magnetic resonance imaging (fMRI), which is used to measure brain activity by detecting variations in blood oxygen levels.</p>



<p>These high-resolution scans came courtesy of Kendrick Kay, a collaborator at the <a href="https://twin-cities.umn.edu" target="_blank" rel="noreferrer noopener">University of Minnesota</a>.</p>



<p>The scans enabled the researchers to observe details of the social cognitive network that are not seen in lower-resolution brain scans.</p>



<h2 class="wp-block-heading" id="h-social-cognition-of-the-brain">Social cognition of the brain</h2>



<p>Understanding the interplay between the amygdala and the social <a href="https://www.earth.com/news/transcendent-thinking-promotes-brain-growth-in-adolescents/" target="_blank" rel="noreferrer noopener">cognitive</a> network offers significant insights into the evolutionary trajectory of the human brain. </p>



<p>This unique relationship represents a sophisticated adaptation that allows for higher-order social processing, an attribute crucial for the complex social structures that define human societies.</p>



<p>By aligning instinctual responses with advanced cognitive capabilities, this system equips humans with the ability to navigate intricate social landscapes, promoting cooperation, empathy, and theoretical thinking.</p>



<p>Such advancements have likely been pivotal in humanity's survival and success as a species, reflecting an evolutionary advantage to processing social information.</p>



<h2 class="wp-block-heading" id="h-implications-for-anxiety-and-depression">Implications for anxiety and depression</h2>



<p>Both anxiety and depression involve amygdala hyperactivity, which can lead to excessive emotional responses and impaired emotional regulation. Current treatments, like deep brain stimulation, are invasive because of the amygdala's deep-seated location in the brain.</p>



<p>With the insights this study provides, transcranial magnetic stimulation (TMS), a less intrusive procedure, might be used to target the amygdala indirectly by focusing on the interconnected regions. This could offer a new, more comfortable treatment route for those dealing with these disorders.</p>



<p>Does this mean we are a step closer to alleviating the emotional load carried by millions around us? Only time will tell. But it is studies like these that keep inching us forward in our quest to better understand <a href="https://www.earth.com/news/humans-are-walking-ecosystems-and-microbes-rule-their-evolution/" target="_blank" rel="noreferrer noopener">ourselves</a>, our brains, and our shared humanity.</p>



<p>So next time you leave a social gathering and get swamped by intrusive thoughts about the way others see you, remember that it's just your evolved human brain at work. And who knows, this advanced cognitive trait might offer a lifeline to many who grapple with their emotional well-being.</p>



<p>The study titled “The human social cognitive network contains multiple regions within the amygdala”&nbsp; is published in the journal <em><a href="https://www.science.org/doi/10.1126/sciadv.adp0453" target="_blank" rel="noreferrer noopener">Science Advances</a>.</em></p>



<p>—–</p>



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'Lizard brain' shapes social abilities in humans

Picture yourself at a social event. As the gathering comes...

<p>What if switching to a vegan diet could not only save you money but also upgrade your health?</p>



<p>A new study from the Physicians Committee for Responsible Medicine suggests that trading in red meat and dairy products for a greener diet could be kinder to both your wallet and your well-being. </p>



<h2 class="wp-block-heading" id="h-saving-money-on-a-vegan-diet">Saving money on a vegan diet</h2>



<p>The focus of the study was a humble vegan diet that is low in fat and bursting with fruits, grains, veggies, and beans. This <a href="https://www.earth.com/news/what-you-eat-can-literally-change-the-world/" target="_blank" rel="noreferrer noopener">dietary change</a> could slash your food bill by an impressive 19 percent.</p>



<p>That's a savings of $1.80 each day when compared to the traditional American diet consisting of meat, dairy, and other animal-derived products.</p>



<p>While this amount may not seem like much, if you multiply those savings over a year, they add up to $650.</p>



<h2 class="wp-block-heading" id="h-exploring-the-mediterranean-diet">Exploring the Mediterranean diet </h2>



<p>But what if you find yourself gravitating towards a Mediterranean diet? </p>



<p>With its emphasis on fruits, vegetables, legumes, fish, low-fat dairy, and extra-virgin olive oil, this heart-friendly diet might cost you a tad more - about 60 cents per day - compared to the Standard American Diet (SAD).</p>



<p>But if stack up the low-fat vegan diet against the Mediterranean diet, the savings rise to a significant $2.40 per day - a whopping 25% drop in food costs.</p>



<h2 class="wp-block-heading" id="h-costs-of-a-vegan-diet">Costs of a vegan diet </h2>



<p>The secret to these savings is simple: swap out the costly meat and dairy for budget-friendly plant-based <a href="https://www.earth.com/news/global-diet-shifts-the-hidden-costs-of-what-we-eat/" target="_blank" rel="noreferrer noopener">alternatives</a>, and you've got yourself a deal.</p>



<p>The study's findings revealed a daily savings of $2.90 on meat, 50 cents on dairy, and an additional 50 cents on added fats with a vegan diet. But it's not all about the money, is it?</p>



<p>Dr. Hana Kahleova is the study's lead researcher and the Director of Clinical Research at the Physicians Committee for Responsible Medicine (<a href="https://www.pcrm.org" target="_blank" rel="noreferrer noopener">PCRM</a>).</p>



<p>"A vegan diet won't just save money; it could save lives by helping to avoid or improve conditions like obesity, type 2 diabetes, and heart disease," said Dr. Kahleova.</p>



<p>Sure, the vegan diet comes with its own additions to the bill - an extra 50 cents a day on vegetables, 30 cents on grains, and a supplementary 50 cents on meat alternatives.</p>



<p>Yet, it seems like even with these additions, the financial and health benefits tip the balance in favor of the vegan lifestyle.</p>



<h2 class="wp-block-heading" id="h-is-going-vegan-worth-it">Is going vegan worth it?</h2>



<p>The study also revealed that a low-fat vegan diet outperformed the Mediterranean diet in areas of weight, body composition, insulin sensitivity, and cholesterol levels.</p>



<p>So, before you turn a blind eye to that tofu or give those beans the cold shoulder, consider this: Could saving money while potentially improving your health be reason enough to give a plant-based <a href="https://www.earth.com/news/world-food-day-fighting-global-hunger/" target="_blank" rel="noreferrer noopener">diet</a> a chance?</p>



<p>With the cost of living on a steady incline, a vegan diet seems like an option that is worth considering.</p>



<h2 class="wp-block-heading" id="h-vegan-diet-and-environmental-consciousness">Vegan diet and environmental consciousness </h2>



<p>While we're pondering personal health and financial benefits, it's only fair that we consider the environmental implications of our dietary choices. Shifting towards a vegan diet doesn’t just favor your finances but also ticks the eco-friendly box.</p>



<p>Animal agriculture contributes to a significant portion of greenhouse gas emissions, land degradation, and deforestation. By shifting towards a greener diet, we have a shot at significantly reducing our carbon footprints.</p>



<p>Producing plant-based foods generally calls for fewer resources like land and water, and results in fewer emissions compared to meat and dairy production. </p>



<p>This compelling argument weaves together the ecological, personal, and financial advantages of going vegan.</p>



<h2 class="wp-block-heading" id="h-navigating-through-the-green-transition">Navigating through the green transition</h2>



<p>Granted, the benefits of a vegan diet are plentiful. But the transition might come with a few bumps in the road, especially when it comes to snapping out of old habits and ensuring nutritional adequacy.</p>



<p>Thankfully, assistance is abundant. Recipes, meal plans, and nutritional guides could ease the transition, ensuring a wholesome <a href="https://www.earth.com/news/modern-human-diets-pose-many-risks-health-environment/" target="_blank" rel="noreferrer noopener">diet</a>. </p>



<p>Community support - such as online forums or local vegan groups - can provide needed motivation and answer pressing questions. Introducing plant-based meals gradually into your routine might make the shift feel less formidable and more sustainable.</p>



<p>Setting achievable goals, like starting with one vegan meal a day, could pave the way for lasting changes that benefit both your health and the environment.</p>



<p>The study is published in the journal <em>JAMA Network Open</em>.</p>



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Switching to a vegan diet can cut grocery costs by a very significant amount

What if switching to a vegan diet could not only...

<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></p>
<div class="vdb_player vdb_58e3ebce955a315103d39bd158d96b98cd4fed198a0d2a49" vdb_params="m.embeded=cms_video_plugin_www.earth.com" data-placeholder="//img.vidible.tv/prod/2017-06/09/593b1f9b1de5a1766916bc0f/593b1fc3b4dbed1fa4163221_o_A_v2.jpg?w=1440&#038;h=900">	<script type="text/javascript" src="//delivery.vidible.tv/jsonp/pid=58e3ebce955a315103d39bd1/vid=593b1f9b1de5a1766916bc0f/58d96b98cd4fed198a0d2a49.js?m.embeded=cms_video_plugin_www.earth.com"></script></div>
<p><br />
<span style="font-weight: 400;">Today’s </span><b>Video of the Day</b><span style="font-weight: 400;"> comes thanks to </span><a href="http://www.esa.int/"><span style="font-weight: 400;">ESA’s</span></a> <i><span style="font-weight: 400;">Earth from Space </span></i><span style="font-weight: 400;">series and features a look at Botswana.</span></p>
<p><span style="font-weight: 400;">The clip features images taken by the Sentinel-2A satellite taken over the Central District in <a href="https://www.earth.com/news/african-countries-are-divided-over-ivory-trade/">Botswana. </a></span></p>
<p><span style="font-weight: 400;">&#8212;</span></p>
<p><i><span style="font-weight: 400;">By </span></i><a href="mailto:rarnold@earth.com"><i><span style="font-weight: 400;">Rory Arnold</span></i></a><i><span style="font-weight: 400;">, </span></i><a href="https://www.earth.com/staff"><i><span style="font-weight: 400;">Earth.com</span></i></a></p>
<p><i><span style="font-weight: 400;">Source: </span></i><a href="http://www.esa.int/spaceinvideos/Videos/2017/03/Earth_from_Space_Central_District_Botswana"><i><span style="font-weight: 400;">ESA</span></i></a></p>

Earth from space: Botswana