<p>Today's <strong>Image of the Day</strong> from <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA Earth Observatory</a> features dust streaming from Lago Colhué Huapi, a shallow endorheic lake located in the Chubut Province in southern Argentina.</p>



<p>"Strong northwesterly winds often race down the eastern side of the Andes Mountains and whip across the central Patagonian Desert. In the process, they sometimes lift dust from Argentina’s drying Lago Colhué Huapi, fueling intense dust storms," said NASA.</p>



<p>"Lago Colhué Huapi is a particularly rich source of dust because the shallow lake regularly grows and shrinks with variations in the flow of the Senguer River and the pace of evaporation. When lake water levels are low, as they were when MODIS captured this image, fine-grained, lightweight particles are easily transported by the wind."</p>



<h2 class="wp-block-heading" id="h-dust-activity-from-lago-colhue-huapi">Dust activity from Lago Colhué Huapi</h2>



<p><a href="https://www.earth.com/news/dust-storms-in-the-gulf-of-alaska-help-shape-the-global-climate/" target="_blank" rel="noreferrer noopener">Dust storms</a> in this region are most common during the summer months from December to March. There are 15 to 30 dust storms in a typical year. </p>



<p>"Dust storms are frequent and persistent enough in this area that they have exposed an open-air archaeological site along the lake’s edge," said NASA.</p>



<p>"The Puesto Roberts 1 site, located in an old floodplain on the southeast side of Lago Colhué Huapi, was first identified in 2019 when archaeologists noticed that winds had exposed a five-centimeter layer of sandy loam soil littered with stone tools and the bones of a wild species of llama called guanaco."</p>



<p>"Archaeologists identified 427 artifacts at the site - including stone cutting blades, milling tools, scrapers, and egg-shaped bola stones used for hunting - spread across 15 square meters, according to a 2022 study led by Heidi Hammond, an archaeologist at the National University of the Patagonia San Juan Bosco."</p>



<h2 class="wp-block-heading" id="h-more-about-lago-colhue-huapi">More about Lago Colhué Huapi</h2>



<p>This lake is an interesting geographical feature primarily because it acts as a seasonal sink for the Senguerr River, which in turn gathers waters from various smaller streams in the region.&nbsp;</p>



<h3 class="wp-block-heading" id="h-size">Size</h3>



<p>Due to its shallow nature, the size of Lago Colhué Huapi can vary significantly with the seasons and the amount of water it receives from its sources. During times of drought or reduced rainfall, the <a href="https://www.earth.com/news/climate-change-is-pushing-lakes-to-their-boiling-point/" target="_blank" rel="noreferrer noopener">lake</a> can shrink considerably, affecting the local ecosystem and the wildlife that depends on it.</p>



<h3 class="wp-block-heading" id="h-climate">Climate</h3>



<p>The lake's surroundings are characterized by a semi-arid climate, which influences the type of vegetation and animal life that can thrive in the area. Despite the harsh conditions, the region around Lago Colhué Huapi supports a variety of bird species, making it a site of interest for birdwatchers and naturalists.</p>



<h3 class="wp-block-heading" id="h-environmental-challenges">Environmental challenges </h3>



<p>In recent years, Lago Colhué Huapi has faced environmental challenges, including the impact of <a href="https://www.earth.com/news/alarming-study-most-of-the-worlds-largest-lakes-are-quickly-losing-water/" target="_blank" rel="noreferrer noopener">climate change</a>, which has led to lower water levels and increased salinity. These changes pose threats to the lake's ecological balance and the species that inhabit its waters and shores. The situation at Lago Colhué Huapi serves as a reminder of the broader environmental issues facing water bodies in arid and semi-arid regions around the world.</p>



<p>The image was captured on March 29, 2024 by the MODIS (Moderate Resolution Imaging Spectroradiometer) on NASA’s Aqua satellite.</p>



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



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Dust streams from Lago Colhué Huapi in Argentina 

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

<p>Today's <strong>Image of the Day</strong> from the <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">European Space Agency</a> features the star-forming region NGC 604, which is located 2.73 million light-years away from Earth in the Triangulum Galaxy (M33). The image was captured by the James Webb Space Telescope.</p>



<p>By studying regions like NGC 604, astronomers can gain insights into the complex interactions between stars and the interstellar medium, as well as the conditions that lead to the birth of stars. This, in turn, helps in understanding the evolution of <a href="https://www.earth.com/news/galaxies-like-our-own-milky-way-are-not-unique/" target="_blank" rel="noreferrer noopener">galaxies</a> and the universe as a whole.</p>



<h2 class="wp-block-heading" id="h-massive-stars-of-ngc-604">Massive stars of NGC 604</h2>



<p>"Sheltered among NGC 604’s dusty envelopes of gas are more than 200 of the hottest, most massive kinds of stars, all in the early stages of their lives," said ESA.</p>



<p>"These types of stars are known as B-types and O-types, the latter of which can be more than 100 times the mass of our own Sun. It’s quite rare to find this concentration of them in the nearby Universe. In fact, there’s no similar region within our own Milky Way galaxy."</p>



<p>"This concentration of massive stars, combined with its relatively close distance, means NGC 604 gives astronomers an opportunity to study these objects at a fascinating time early in their life."</p>



<h2 class="wp-block-heading" id="h-gigantic-region-of-ionized-hydrogen">Gigantic region of ionized hydrogen</h2>



<p>NGC 604 is one of the largest known regions of ionized hydrogen, also known as an H II region. This nebula is significantly larger than the Orion Nebula, which is one of the most well-known H II regions in our own <a href="https://www.earth.com/news/large-amount-of-dark-matter-may-be-missing-from-the-milky-way/" target="_blank" rel="noreferrer noopener">Milky Way galaxy</a>. </p>



<p>NGC 604 spans about 1,500 light-years across, making it one of the largest H II regions in the Local Group of galaxies, which includes the Milky Way, the Andromeda Galaxy, and about 54 other smaller galaxies. </p>



<h2 class="wp-block-heading" id="h-ngc-604-starburst-phenomenon">NGC 604 starburst phenomenon </h2>



<p>Within NGC 604, there are hundreds of young, hot, massive <a href="https://www.earth.com/news/stars-at-the-edge-of-our-milky-way-galaxy-travel-more-slowly/" target="_blank" rel="noreferrer noopener">stars</a>. These stars have ionized the surrounding gas, causing it to glow and creating the nebula. The region is a prime example of a starburst phenomenon, where stars form at a much higher rate than in typical galactic conditions.</p>



<p>“The bright orange streaks in this image signify the presence of carbon-based molecules known as polycyclic aromatic hydrocarbons, or PAHs," explained ESA.</p>



<p>"As you travel further from the immediate cavities of dust where the star is forming, the deeper red signifies molecular hydrogen. This cooler gas is a prime environment for star formation. Ionized hydrogen from ultraviolet radiation appears as a white and blue ghostly glow."</p>



<h2 class="wp-block-heading" id="h-more-about-star-formation">More about star formation </h2>



<p>Star formation is crucial for the evolution of galaxies and the synthesis of heavy elements. Elements heavier than helium are created in the cores of stars and spread throughout the <a href="https://www.earth.com/news/ancient-stars-shakti-shiva-shaped-milky-way-galaxy/" target="_blank" rel="noreferrer noopener">galaxy</a> when stars reach the end of their lives and expel their material, either gently through winds or violently via supernova explosions. This enriching process allows for the formation of new stars and planets, and ultimately, the potential for life.</p>



<h2 class="wp-block-heading" id="h-process-of-star-formation">Process of star formation</h2>



<h3 class="wp-block-heading">Cloud collapse</h3>



<p>The process begins when part of a molecular cloud becomes unstable and starts to collapse under its own gravity. This can be triggered by events like shock waves from nearby <a href="https://www.earth.com/news/supernova-explosions-could-damage-distant-planets/" target="_blank" rel="noreferrer noopener">supernovae</a>, galactic collisions, or the influence of other massive stars.</p>



<h3 class="wp-block-heading">Formation of a protostar</h3>



<p>As the cloud collapses, it fragments into smaller clumps. Each clump will eventually form one or more stars. The material within these clumps continues to fall inward, heating up as it does so, eventually forming a warm core called a protostar. At this stage, the protostar is not yet hot enough for nuclear fusion, the process that powers stars, to occur.</p>



<h3 class="wp-block-heading">Accretion disk</h3>



<p>Around the protostar, material from the surrounding cloud continues to fall inward, forming a rotating disk. This material slowly accretes onto the protostar, increasing its mass.</p>



<h3 class="wp-block-heading">Nuclear fusion begins</h3>



<p>Once the core of the protostar reaches a high enough temperature and pressure, hydrogen atoms begin to fuse into helium, releasing energy in the process. This marks the transition from a protostar to a main sequence star, like our Sun.</p>



<h3 class="wp-block-heading">Main sequence and beyond</h3>



<p>The star will spend the majority of its life in the main sequence stage, where it balances the gravitational forces trying to collapse it and the outward pressure from nuclear fusion. </p>



<p>Eventually, the star will exhaust its hydrogen fuel. Its subsequent evolution will depend on its initial mass, leading to various end stages such as red giants, supernovae, neutron stars, or black holes.</p>



<p>Image Credit: NASA/ESA/CSA James Webb Space Telescope</p>



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NGC 604 is home to hundreds of hot, massive stars

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

<p>Today's <strong>Image of the Day</strong> from <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA Earth Observatory</a> features thick haze over Thailand during the fire season. The photograph was captured by the VIIRS (Visible Infrared Imaging Radiometer Suite) on the Suomi NPP satellite on March 16, 2024.</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. Fire activity 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 NASA.</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>"Such hazes contain mixtures of small airborne particles called aerosols and gaseous pollutants such as nitrogen dioxide, sulfur dioxide, carbon monoxide, and ozone that degrade air quality and have harmful health effects."</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 recently 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-root-causes">Root causes</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 air quality is particularly poor, using air purifiers, wearing masks designed to filter out fine particles, and following local health advisories.</p>



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



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

Haze pollution is an environmental crisis in Thailand

<p>Today's <strong>Image of the Day</strong> from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> features smoke streaming from a fire near the border of Oaxaca and Chiapas in southern Mexico.</p>



<p>"As Mexico entered peak fire season in March 2024, dry and warm conditions helped fuel the flames of more than 100 active blazes across the country," said NASA.</p>



<p>"According to Mexico’s National Forestry Commission (CONAFOR), there were 120 actively burning fires across Mexico on March 27. Preliminary data indicated that fires that day affected more than 7,000 hectares (27 square miles) across 19 of Mexico’s 31 states."</p>



<h2 class="wp-block-heading" id="h-fire-season-in-mexico-nbsp">Fire season in Mexico&nbsp;</h2>



<p>Fire season in Mexico is a period marked by a heightened risk of wildfires, primarily occurring from January through June, with the peak usually observed between March and May. This timing is largely due to the country's climatic patterns, where the end of the dry season and the beginning of the warmer spring months create conditions ripe for fires.&nbsp;</p>



<p>These conditions include dry vegetation, which serves as ample fuel for wildfires, and the onset of warmer temperatures, which can exacerbate the risk of fires starting and spreading.</p>



<p>Mexico's varied topography and climatic zones mean that fire risk and behavior can differ significantly across the country. However, areas with extensive forest cover, such as the pine-oak forests in the northern and central regions, are particularly vulnerable during the fire season.&nbsp;</p>



<p>Human activities, including agricultural practices such as the clearing of land through burning (known as "slash and burn"), contribute significantly to the ignition of these wildfires. Additionally, accidental fires caused by campfires, cigarettes, or even deliberate arson add to the annual fire count.</p>



<h2 class="wp-block-heading" id="h-intense-fire-seasons-across-the-globe-nbsp">Intense fire seasons across the globe&nbsp;</h2>



<p>The phenomenon of more <a href="https://www.earth.com/news/record-breaking-wildfire-years-are-just-getting-started/">intense fire seasons</a> across the globe is a complex and multifaceted issue that intertwines with climate change, land management practices, and human activities.&nbsp;</p>



<p>Over the past decades, several regions around the world have experienced unprecedented wildfires in both frequency and intensity. These fires have resulted in devastating impacts on ecosystems, wildlife, <a href="https://www.earth.com/news/wildfire-smoke-is-an-underestimated-threat-to-public-health/">air quality</a>, and human settlements.</p>



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



<p>In North America, particularly in the United States and Canada, fire seasons have become significantly longer and more destructive.&nbsp;</p>



<p>The combination of prolonged droughts, higher temperatures, and an increase in the amount of dead and dry vegetation has turned vast areas into tinderboxes, ready to ignite with a single spark.&nbsp;</p>



<p>Notably, the wildfires in <a href="https://www.earth.com/news/what-caused-the-devastating-2020-fire-season-in-california/">California</a> have set records for their sheer size and the amount of destruction they've caused, burning millions of acres and destroying thousands of homes.</p>



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



<p>Australia's fire season during 2019-2020, known as the Black Summer, was one of the most severe in the country's history. A prolonged drought and extreme heatwaves contributed to widespread <a href="https://www.earth.com/news/australian-bushfires-triggered-rare-multi-year-la-nina/">bushfires</a> that burned through millions of hectares, destroyed over 3,000 homes, and led to the loss of at least 33 lives.&nbsp;</p>



<p>The environmental impact was catastrophic, with significant losses to wildlife and biodiversity, including an estimated billion animals killed.</p>



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



<p>In the Amazon rainforest, often referred to as the Earth's lungs, there has been an alarming increase in fires. These are largely attributed to deforestation and agricultural practices.&nbsp;</p>



<p>The fires not only contribute to the global carbon emissions but also result in the loss of biodiversity and the degradation of vital ecosystems that are crucial for global climate regulation.</p>



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



<p>Europe has not been spared either, with countries like Greece, Portugal, and Spain experiencing deadly wildfires that have been linked to heatwaves and changing precipitation patterns. The Mediterranean region, in particular, is becoming more susceptible to wildfires as temperatures rise and summers become drier.</p>



<h3 class="wp-block-heading" id="h-siberia-fires">Siberia fires</h3>



<p>Russia's Siberia has also seen an increase in fire activity, with massive wildfires engulfing vast areas of forest. The smoke from these fires has reached as far as the United States and Canada, highlighting the global impact of such events. These fires not only release significant amounts of carbon dioxide but also thaw permafrost, releasing methane, a potent greenhouse gas.</p>



<p>The increasing intensity and frequency of fire seasons around the world underscore the urgent need for global action on <a href="https://www.earth.com/news/wildfire-impacts-are-evolving-due-to-climate-change-but-in-what-ways/">climate change</a> and more sustainable land management practices. As temperatures continue to rise and weather patterns become more extreme, the challenge of managing wildfires and mitigating their impacts becomes increasingly daunting.</p>



<p>The image was captured on March 27, 2024 by the OLI-2 (Operational Land Imager-2) on Landsat 9.</p>



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



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Intense fire season in Mexico is part of a worldwide trend

<p>Today's <strong>Image of the Day</strong> from the <a href="https://www.esa.int/" target="_blank" rel="noreferrer noopener">European Space Agency</a> features the Little Dumbbell Nebula, also known as Messier 76, located in the constellation Perseus 3,400 light-years away from Earth.</p>



<p>Astronomers captured this new image of the Little Dumbbell Nebula to commemorate the 34th anniversary of the Hubble Space Telescope, a joint venture between NASA and the European Space Agency (ESA).</p>



<p>The snapshot provides not only a breathtaking view but also deep insights into the life cycle of <a href="https://www.earth.com/news/dark-stars-scientists-discover-a-new-type-of-star-powered-by-dark-matter/" target="_blank" rel="noreferrer noopener">stars</a> and the dynamic processes within nebulae.</p>



<h2 class="wp-block-heading" id="h-understanding-messier-76">Understanding Messier 76</h2>



<p>Messier 76 is categorized as a planetary nebula, a term which historically arises from its round, planet-like appearance when viewed through early, low-power telescopes. However, the term is somewhat misleading as planetary nebulae have no connection to actual <a href="https://www.earth.com/news/nasa-finds-17-exoplanets-that-have-oceans-and-possibly-alien-life/" target="_blank" rel="noreferrer noopener">planets</a>. </p>



<p>Instead, they represent an expansive shell of luminous gases expelled by a dying red giant star, which subsequently collapses into a dense, hot white dwarf. This transformation marks the late stages of stellar evolution for medium to low-mass stars.</p>



<h2 class="wp-block-heading" id="h-structure-of-messier-76">Structure of Messier 76</h2>



<p>The structure of Messier 76 is particularly notable. It comprises a central ring - viewed edge-on - giving the appearance of a bar-like feature, with two distinct lobes emanating from either side. This formation is believed to be the result of materials ejected by the star during its red giant phase, possibly sculpted by interactions with a companion star.&nbsp;</p>



<p>Although this binary companion is not visible in current Hubble images, its presence is inferred from the thick disk of dust and gas aligned with its orbital plane. The phenomenon of the companion star potentially being absorbed by the primary star, a process akin to stellar cannibalism, is a captivating aspect of the nebula's history.</p>



<h2 class="wp-block-heading" id="h-the-dynamic-environment-of-the-nebula">The dynamic environment of the nebula</h2>



<p>At the core of the nebula, the primary star, now collapsing into a <a href="https://www.earth.com/news/white-dwarf-stars-may-be-billions-of-years-older-than-estimated/" target="_blank" rel="noreferrer noopener">white dwarf</a>, reaches extreme temperatures, estimated at a scorching 120,000 degrees Celsius - about 24 times hotter than the surface of our Sun. </p>



<p>This intensely hot remnant is visible as a small, bright point at the center of the nebula. Directly below this, another star can be seen; however, it is merely aligned with the nebula by chance and is not a part of it.</p>



<p>The dynamics within Messier 76 are driven by powerful forces. The central disk seems to constrict the material, creating two lobes of gas escaping along the rotational axis of the star, perpendicular to the disk.&nbsp;</p>



<p>The lobes are propelled outward by a potent stellar wind, moving at a staggering two million miles per hour. This rapid movement is sufficient to travel the distance from Earth to the <a href="https://www.earth.com/news/timeless-mystery-solved-scientists-uncover-what-is-inside-the-moons-core/" target="_blank" rel="noreferrer noopener">Moon</a> in just over seven minutes. </p>



<p>The collision of the fast-moving gas with older, slower-moving material ejected during the star’s red giant phase results in the stunning glowing effect seen in the nebula. The glow, ignited by the ultraviolet radiation from the white dwarf, is a spectacle of colors with red emanating from nitrogen and blue from oxygen.</p>



<h2 class="wp-block-heading" id="h-a-cosmic-moment-in-time">A cosmic moment in time</h2>



<p>Despite its current brilliance, the existence of the Little Dumbbell Nebula is fleeting on a cosmological scale, expected to last only about 15,000 years - a mere moment in the lifespan of the <a href="https://www.earth.com/news/dark-energy-is-ripping-the-universe-apart-but-we-arent-sure-how/" target="_blank" rel="noreferrer noopener">universe</a>. </p>



<p>This brief period highlights the transient nature of such cosmic phenomena, which, while short-lived, provide crucial insights into the mechanics of stellar evolution and the complex interactions within these celestial sculptures.</p>



<h2 class="wp-block-heading" id="h-more-about-messier-76">More about Messier 76</h2>



<p>Messier 76 was discovered by Pierre Méchain in 1780. It was later cataloged by Charles Messier, who included it in his famous list of nebulous objects.</p>



<p>The nebula's faintness and small size require a good telescope to be observed effectively, with larger telescopes able to reveal more of its fine details and structure.</p>



<p>Studying objects like Messier 76 helps astronomers understand the life cycle of stars and the processes that occur during the late stages of stellar evolution. The materials expelled by planetary nebulae like Messier 76 eventually contribute to the interstellar medium, from which new stars and planetary systems may form.</p>



<p>Image Credit: ESA Space Agency </p>



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



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Cosmic cannibalism and stellar winds: Unveiling the secrets of Messier 76 

Aerial,Top,View,Green,Forest,With,Earth,,Green,Planet,In

<p>Earth, our vibrant planet, has witnessed countless climatic shifts throughout its history, each one leaving an indelible mark on the landscape and the life it sustains. At the heart of this intricate dance between <a href="https://www.earth.com/news/good-news-plants-are-absorbing-more-human-produced-co2-than-expected/" target="_blank" rel="noreferrer noopener">climate and life lie plants</a>, the silent architects of Earth's atmosphere and the key to understanding our planet's response to the pressing issue of global warming. </p>



<p>As researchers delve deeper into the field of biogeodynamics, they uncover the fascinating interplay between <a href="https://www.earth.com/news/climate-change-triggers-epic-plant-migration-in-brazils-cerrado/" target="_blank" rel="noreferrer noopener">vegetation and climate</a>, revealing how Earth's flora has not only adapted to changing conditions but also played an active role in shaping the very climate that sustains them.</p>



<h2 class="wp-block-heading" id="h-interplay-of-plant-life-and-earth-s-climate">Interplay of plant life and Earth's climate</h2>



<p>Julian Rogger, a researcher at the Institute of Geophysics at <a href="https://ethz.ch/en.html" target="_blank" rel="noreferrer noopener">ETH Zurich</a>, is fascinated by the interplay of plant life and climate. </p>



<p>Earth is the only known planet in the universe capable of supporting living organisms, thanks to its climatic conditions that allow for the presence of liquid water. Rogger explains, "We're trying to understand processes relevant to the present using the geological past."</p>



<p>When the planet's climate shifts, it impacts <a href="https://www.earth.com/news/trees-struggling-to-breathe-store-co2-hotter-climate/" target="_blank" rel="noreferrer noopener">plant life</a>, forcing ecosystems to evolve and adapt to changing conditions. "I'm interested in the role of life itself in the whole system," Rogger says. "I find it really fascinating to reconstruct the world as it was millions of years ago."</p>



<h2 class="wp-block-heading" id="h-plants-as-active-participants-in-earth-s-climate-cycle">Plants as active participants in Earth's climate cycle</h2>



<p>In a recent paper published in the journal <em>Science Advances</em>, Rogger and colleagues from ETH and the <a href="https://www.leeds.ac.uk/" target="_blank" rel="noreferrer noopener">University of Leeds</a> argue that plants are not just passive participants in Earth's climate cycle, but can play an important role in shaping it. </p>



<p>"We could assume life is just reacting to changes, but it's also possible it's interacting with the system and regulates it," Rogger says.</p>



<p>Using <a href="https://www.earth.com/news/ai-sleap-creating-new-plants-that-help-fight-climate-change/" target="_blank" rel="noreferrer noopener">computer models</a> that simulate the interplay between climate change, continental movement, and plant life in the deep past, Rogger and his team have shown that plants likely help regulate the Earth's atmosphere by trapping carbon and emitting oxygen, thus controlling CO2 levels. </p>



<p>They also accelerate the process of mineral weathering in soils, which consumes CO2. The models suggest that the planet's climate and atmosphere are part of a feedback loop, with life itself playing a role in regulating or accelerating climatic changes.</p>



<h2 class="wp-block-heading" id="h-speed-of-climatic-change-is-a-critical-factor">Speed of climatic change is a critical factor</h2>



<p>The speed of climatic change is a critical factor in determining the impact on <a href="https://www.earth.com/news/beneficial-plant-bacteria-likely-to-decline-due-to-climate-change/" target="_blank" rel="noreferrer noopener">plant life</a>. When change is slow enough for plants to evolve or spread to new niches over millions of years, plant activity can act as a buffer, preventing temperatures from shifting too rapidly. </p>



<p>However, the geological record and fossil evidence show that there have been changes that occurred too quickly, resulting in major disruptions of vegetation and even mass extinctions.</p>



<p>"What we want to know is how fast vegetation is able to <a href="https://www.earth.com/news/plants-have-a-way-of-telling-us-what-climate-they-can-survive-in/" target="_blank" rel="noreferrer noopener">change its characteristics</a> when the world suddenly gets 5 or 6 degrees warmer," Rogger says. "The overall goal is to understand the co-evolution of climate, vegetation and tectonics."</p>



<h2 class="wp-block-heading" id="h-modeling-the-past-to-understand-the-present">Modeling the past to understand the present</h2>



<p>Rogger and his interdisciplinary team of geologists, computer scientists, and earth scientists created a computer model of the last 390 million years, taking into account the shifting of continents, climate, and <a href="https://www.earth.com/news/flowers-blooming-92-days-earlier-due-to-climate-change/" target="_blank" rel="noreferrer noopener">vegetation's response</a> to these changes. </p>



<p>Running simulations on powerful supercomputers can take up to a month due to the complexity of the problem and the length of time they represent.</p>



<p>The team uses geological data, such as chemical analysis of sediments and fossils, to make the models as realistic as possible. </p>



<p>The models show that long periods of stability allow <a href="https://www.earth.com/news/hidden-power-plants-impact-climate-ecosystems/" target="_blank" rel="noreferrer noopener">vegetation to flourish</a>, absorbing CO2 and stabilizing the Earth's climate over time. Plants were able to evolve fast enough to adjust to gradual shifts in climate and landscapes due to continental drift.</p>



<p>However, when the climate system is disrupted and changes too rapidly for vegetation to adapt, plants are wiped out and can't act as a buffer to slow down shifts in climate. </p>



<p>"It's like a feedback effect," Rogger explains. "Because regulation falls away, you could have a stronger increase in CO2 and more climate change than was previously expected."</p>



<h2 class="wp-block-heading" id="h-resilience-of-earth-s-ecosystems">Resilience of Earth's ecosystems</h2>



<p>At a time when the Earth's climate is changing faster than ever before, Rogger's research has practical implications. Information from the past can help us understand how resilient the Earth's interlocking systems are. </p>



<p>"How fast are ecosystems able to respond to changes in the climate and landscape? That's one of the major unknowns," he says. "It's an acute question – how resilient is the Earth?"</p>



<p>In summary, as we face the unprecedented pace of climate change today, Rogger's research serves as a vital reminder of the intricate dance between life, plants and Earth's climate.</p>



<p>By studying the past, we gain invaluable insights into the resilience of Earth's ecosystems and their <a href="https://www.earth.com/news/plants-pass-down-memories-to-help-offspring-survive/" target="_blank" rel="noreferrer noopener">ability to adapt</a> to changing conditions. This knowledge arms us with the tools to better understand and respond to the challenges we face in the present and future. </p>



<p>As we work to protect and preserve our planet's delicate balance, we must remember that we are not mere spectators in Earth's climate dance, but active participants with the power to shape its rhythm for generations to come.</p>



<p>The full study was published in the journal <em><a href="https://www.science.org/doi/10.1126/sciadv.adj4408" target="_blank" rel="noreferrer noopener">Science Advances</a></em>.</p>



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



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How plants actively shaped Earth's climate cycle throughout history

Earth, our vibrant planet, has witnessed countless climatic shifts throughout...

Smiling,Happy,Healthy,Middle,Aged,50s,Woman,Holding,Glass,Of

<p>In the quest to extend human lifespan and improve overall health, scientists have been searching for effective <a href="https://www.earth.com/news/drinking-tea-delays-biological-aging/" target="_blank" rel="noreferrer noopener">anti-aging interventions</a>. They may have found one by accident. A drug used for high blood pressure, known as rilmenidine, may also be effective in slowing the aging process.</p>



<p>While caloric restriction has been considered the most robust method to <a href="https://www.earth.com/news/t-cells-could-be-used-to-slow-down-or-even-reverse-aging/" target="_blank" rel="noreferrer noopener">promote longevity</a> across species, its mixed results and side effects in humans have led researchers to explore alternative solutions.</p>



<h2 class="wp-block-heading" id="h-rilmenidine-potential-game-changer-in-the-fight-against-aging">Rilmenidine: Potential game-changer in the fight against aging</h2>



<p>Researchers from <a href="https://ethz.ch/en.html" target="_blank" rel="noreferrer noopener">ETH Zürich</a>, <a href="https://hms.harvard.edu/" target="_blank" rel="noreferrer noopener">Harvard Medical School</a>, and the <a href="https://www.liverpool.ac.uk/" target="_blank" rel="noreferrer noopener">University of Liverpool</a>, led by Professor João Pedro Magalhães, have found that rilmenidine, an antihypertensive medication, can extend lifespan and slow aging in animals.</p>



<p>The study demonstrates that treating animals with rilmenidine at both young and older ages increases lifespan and improves health markers, mimicking the effects of <a href="https://www.earth.com/news/intermittent-fasting-may-be-the-secret-to-slowing-down-aging/" target="_blank" rel="noreferrer noopener">caloric restriction</a>. </p>



<p>Professor Magalhães, now based at the <a href="https://www.birmingham.ac.uk/" target="_blank" rel="noreferrer noopener">University of Birmingham</a>, emphasized the significance of these findings, stating, "With a global aging population, the benefits of delaying aging, even if slightly, are immense."</p>



<h2 class="wp-block-heading" id="h-role-of-the-i1-imidazoline-receptor">Role of the I1-imidazoline receptor</h2>



<p>The researchers also discovered that the healthspan and lifespan benefits of rilmenidine treatment in the roundworm <em>C. elegans</em> are mediated by the I1-imidazoline receptor nish-1. </p>



<p>This identification of nish-1 as a potential <a href="https://www.earth.com/news/scientists-have-identified-anti-aging-drugs-using-ai-technology/" target="_blank" rel="noreferrer noopener">longevity target</a> opens up new avenues for future research and drug development.</p>



<p>I1-imidazoline receptors are a family of receptors that bind to imidazoline compounds and are involved in various physiological processes. </p>



<p>These receptors are found in both invertebrates and vertebrates, including humans. They are distinct from alpha-2 adrenergic receptors, although some imidazoline compounds can bind to both receptor types.</p>



<p>I1-imidazoline receptors are located in the central nervous system, particularly in the brainstem and hypothalamus, as well as in peripheral tissues such as the kidneys, pancreas, and adipose tissue. They play a role in regulating blood pressure, insulin secretion, and lipid metabolism.</p>



<h3 class="wp-block-heading" id="h-i1-imidazoline-receptors-are-the-unsung-heroes-of-physiology">I1-Imidazoline receptors are the unsung heroes of physiology</h3>



<p>Several studies have investigated the potential therapeutic applications of targeting I1-imidazoline receptors. For example, some research suggests that activating these receptors may have antidepressant effects and could be useful in treating depression and <a href="https://www.earth.com/news/lsd-can-treat-crippling-anxiety-with-a-single-dose/" target="_blank" rel="noreferrer noopener">anxiety disorders</a>. </p>



<p>Other studies have explored the role of I1-imidazoline receptors in regulating glucose homeostasis and their potential as targets for the treatment of <a href="https://www.earth.com/news/sleep-deprivation-linked-type-2-diabetes-risk/" target="_blank" rel="noreferrer noopener">type 2 diabetes</a>.</p>



<p>However, much remains to be discovered about the specific functions and mechanisms of I1-imidazoline receptors in different species and their potential as therapeutic targets. </p>



<p>Further research is needed to fully understand the role of these receptors in various physiological processes and to develop targeted therapies that can harness their potential for treating a range of conditions, including <a href="https://www.earth.com/news/plant-protein-linked-to-healthier-aging-and-lower-risk-of-disease/" target="_blank" rel="noreferrer noopener">aging-related diseases</a>.</p>



<h2 class="wp-block-heading" id="h-anti-aging-advantages-of-rilmenidine">Anti-aging advantages of rilmenidine</h2>



<p>One of the key advantages of rilmenidine is its potential for future translatability to humans. Unlike other drugs previously studied for <a href="https://www.earth.com/news/harvard-scientists-fountain-of-youth-pill-sparks-controversy/" target="_blank" rel="noreferrer noopener">anti-aging purposes</a>, rilmenidine is a widely-prescribed, oral antihypertensive medication with rare and non-severe side effects. </p>



<p>This makes it a more feasible and safer option for human use compared to caloric restriction, which has shown mixed results and side effects in human studies.</p>



<h2 class="wp-block-heading" id="h-untapped-potential-of-drug-repurposing">Untapped potential of drug repurposing</h2>



<p>Professor Magalhães highlighted the immense potential of repurposing drugs for extending lifespan and healthspan, stating, "Repurposing drugs capable of extending lifespan and healthspan has a huge untapped potential in translational geroscience." </p>



<p>This study marks the first time rilmenidine has been shown to increase lifespan in animals, paving the way for further exploration of its potential clinical applications.</p>



<h2 class="wp-block-heading" id="h-promising-step-towards-healthier-aging">Promising step towards healthier aging</h2>



<p>This study on rilmenidine, led by Professor João Pedro Magalhães, offers a glimmer of hope in the search for effective anti-aging interventions. </p>



<p>By demonstrating rilmenidine's ability to extend lifespan and improve health markers in animals, the researchers have unlocked a potential game-changer in the field of geroscience. </p>



<p>As they continue to explore the drug's mechanisms and potential clinical applications, the prospect of repurposing this widely-prescribed antihypertensive medication for healthier aging becomes increasingly tangible. </p>



<p>With further research and development, rilmenidine could pave the way for a new era of accessible and effective anti-aging solutions, bringing us one step closer to the dream of a longer, healthier life.</p>



<p>The full study was published in the journal <em><a href="https://onlinelibrary.wiley.com/doi/10.1111/acel.13774" target="_blank" rel="noreferrer noopener">Aging Cell</a></em>.</p>



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



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High blood pressure drug called 'rilmenidine' dramatically slows aging in animals

In the quest to extend human lifespan and improve overall...

<p>The latest negotiations on a global treaty to address plastic pollution concluded in Canada early Tuesday, advancing the dialogue despite significant debates, particularly over the prospect of setting global limits on <a href="https://www.earth.com/news/plastic-production-increases-create-identical-plastic-pollution-increase/" target="_blank" rel="noreferrer noopener">plastic production</a>. </p>



<p>This session marked a pivotal shift as negotiators for the first time discussed the draft text of the treaty, moving from conceptual discussions to concrete treaty language.</p>



<p>The session in Ottawa, which is the fourth of five planned meetings, saw negotiators grappling with one of the most contentious issues: the potential limitation of plastic production.&nbsp;</p>



<h2 class="wp-block-heading" id="h-highly-complex-issue">Highly complex issue</h2>



<p>Despite strong objections from countries and industries reliant on plastic production, this issue remained in the treaty draft. Since most plastic is manufactured using fossil fuels and chemicals, reducing production is a highly complex issue.</p>



<p>As the meeting wrapped up, the committee resolved to continue refining the treaty's terms before reconvening for the final session in South Korea later this year.&nbsp;</p>



<h2 class="wp-block-heading" id="h-moving-forward-with-the-plastics-treaty">Moving forward with the plastics treaty</h2>



<p>The next session will focus on key issues such as financing mechanisms for the treaty's implementation, assessing <a href="https://www.earth.com/news/4200-harmful-plastic-chemicals-hidden-in-everyday-objects/" target="_blank" rel="noreferrer noopener">chemicals</a> of concern in plastics, and examining product design. </p>



<p>However, Rwanda's representative expressed concern that by not directly addressing the volume of plastic production, negotiators were avoiding a critical issue.</p>



<p>“In the end, this is not just about the text, it’s not just about the process,” said Jyoti Mathur-Filipp, the executive secretary of the committee. “It is quite simply about providing a better future for generations and for our loved ones.”&nbsp;</p>



<h2 class="wp-block-heading" id="h-focus-on-circularity-nbsp">Focus on circularity&nbsp;</h2>



<p>Industry representatives, however, have different priorities. Stewart Harris from the <a href="https://icca-chem.org/" target="_blank" rel="noreferrer noopener">International Council of Chemical Associations</a> emphasized the industry's focus on <a href="https://www.earth.com/news/recycling-is-not-enough-to-address-the-plastic-crisis/" target="_blank" rel="noreferrer noopener">recycling</a> and reusing plastics, a concept often referred to as “circularity.” </p>



<p>Thus, the Council does not want a cap on plastic production, and considers that chemicals should not be regulated through this agreement.&nbsp;</p>



<p>Harris also expressed satisfaction with the progress made in discussions, particularly around additional work on financing and plastic product design.</p>



<h2 class="wp-block-heading" id="h-addressing-the-issue-of-microplastics-nbsp">Addressing the issue of microplastics&nbsp;</h2>



<p>The negotiations were also informed by scientific input aimed at dispelling myths about plastics.&nbsp;</p>



<p>“I heard yesterday that there’s no data on <a href="https://www.earth.com/news/microplastics-migrate-from-the-gut-to-other-organs/" target="_blank" rel="noreferrer noopener">microplastics</a>, which is verifiably false: 21,000 articles on micro and nanoplastics have been published,” said Bethanie Carney Almroth, an ecotoxicology professor and co-leader of the <a href="https://ikhapp.org/scientistscoalition/" target="_blank" rel="noreferrer noopener">Scientists’ Coalition for an Effective Plastics Treaty</a>. She also mentioned challenges faced by scientists, including harassment by industry lobbyists.</p>



<p>In a news conference on Saturday, members of an Indigenous Peoples’ Caucus said that microplastics are contaminating their food supply and threatening their communities and ways of life.&nbsp;</p>



<p>“We have bigger stakes. These are our ancestral lands that are being polluted with plastic,” said Juressa Lee of New Zealand. “We’re rights holders, not stakeholders. We should have more space to speak and make decisions than the people causing the problem.”</p>



<h2 class="wp-block-heading" id="h-common-goal-to-move-forward-with-plastics-treaty">Common goal to move forward with plastics treaty</h2>



<p>Despite these challenges, the diverse group of countries shared a common goal to progress with the treaty.&nbsp;</p>



<p>“Because at the end of the day, we’re talking about the survival of the future of life, not only of human life but all sorts of life on this planet,” argued Ecuador’s chief negotiator, Walter Schuldt.</p>



<p>However, the discussions, initiated by a resolution proposed by Rwanda and Peru, have been marked by slow progress and intense debate.&nbsp;</p>



<p>“We took a major step forward after two years of lots of discussion. Now we have text to negotiate,” said Björn Beeler, the international coordinator for the <a href="https://www.ipen.org/" target="_blank" rel="noreferrer noopener">International Pollutants Elimination Network</a>. “Unfortunately, much more political will is needed to address the out of control escalating plastic production.”</p>



<h2 class="wp-block-heading" id="h-plastics-treaty-negotiations-continue">Plastics treaty negotiations continue</h2>



<p>As the plastics treaty negotiation process continues, the involvement of affected communities and advocacy groups underscores the urgent need for change.&nbsp;</p>



<p>From Louisiana to New Zealand, individuals and groups are calling for actions that go beyond government discussions to address the tangible impacts of <a href="https://www.earth.com/news/the-interlinked-crisis-of-plastic-pollution-and-global-warming/" target="_blank" rel="noreferrer noopener">plastic pollution</a> on communities and natural environments. </p>



<p>This collective effort highlights a global recognition of the need for significant and effective measures to combat plastic pollution, ensuring a healthier planet for future generations.</p>



<p>“We are working toward a world where we won’t have plastic litter everywhere in our ecosystems,” said Mathur-Filipp. “The energy is there, the will is there and I know we will get an instrument by the end of the year.”</p>



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



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Plastics treaty talks: Slow progress yet restored hope

The latest negotiations on a global treaty to address plastic...

<p></p>
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<p><br />
<span style="font-weight: 400;">The history of water on Mars Today&#8217;s </span><b>Video of the Day </b><span style="font-weight: 400;">from the </span><a href="https://www.esa.int/"><span style="font-weight: 400;">European Space Agency</span></a><span style="font-weight: 400;"> describes how data from the ExoMars Trace Gas Orbiter is providing new insight into water loss on Mars, which also sheds light on the planet’s climate evolution.</span></p>
<p><span style="font-weight: 400;">The liquid water that once flowed across the surface of Mars is now mostly locked up in ice caps and buried underground. However, water loss is still taking place even today.</span></p>
<p><span style="font-weight: 400;">The ExoMars Trace Gas Orbiter is following the vertical path of water through the atmosphere and tracking its changing isotopic composition. This data can be used to estimate water loss on Mars.  Water on Mars. However, it seems Mars once had liquid water flowing on the surface. This would make large areas like Earth&#8217;s oceans. There are a number of signs of water on or under the surface, now or in the distant past. These include stream beds, polar caps, spectroscopic measurement, eroded craters.</span></p>
<p><span style="font-weight: 400;">V</span><i><span style="font-weight: 400;">ideo Credit: ESA </span></i></p>
<p><span style="font-weight: 400;">&#8211;</span><span style="font-weight: 400;">&#8212;</span></p>
<p><i><span style="font-weight: 400;">By </span></i><a href="http://csexton@earth.com"><i><span style="font-weight: 400;">Chrissy Sexton</span></i></a><i><span style="font-weight: 400;">, </span></i><a href="https://www.earth.com/staff/"><i><span style="font-weight: 400;">Earth.com</span></i></a><i><span style="font-weight: 400;"> Staff Writer</span></i></p>