<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 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>



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

<p>Today's Image of the Day from <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA Earth Observatory</a> features a vibrant and detailed depiction of the Gulf of Oman. The image was captured on March 17, 2024 by the primary sensor on the PACE satellite. </p>



<h2 class="wp-block-heading" id="h-pace-satellite-nbsp">PACE satellite&nbsp;</h2>



<p>NASA launched the PACE (Plankton, Aerosol, Cloud, ocean Ecosystem) satellite aboard a SpaceX Falcon 9 rocket on February 8, 2024. The mission marks a significant advancement in our ability to study Earth’s oceanic and atmospheric systems.&nbsp;</p>



<p>The PACE satellite is equipped with a state-of-the-art Ocean Color Instrument (OCI), designed to capture intricate details of ocean phenomena that are often invisible to the naked eye. This technology aims to provide new insights into the complex interactions between the <a href="https://www.earth.com/news/good-news-ocean-oxygen-loss-may-ultimately-reverse/" target="_blank" rel="noreferrer noopener">ocean</a> and the atmosphere.</p>



<h2 class="wp-block-heading" id="h-compelling-visual-data-nbsp">Compelling visual data&nbsp;</h2>



<p>Less than two months after its launch, the PACE satellite has already begun delivering compelling visual data, thanks to the efforts of NASA engineer Joseph Knuble and his team. Knuble, who serves as the lead instrument systems engineer for OCI, compiled a remarkable gallery of 36 images.</p>



<p>This standout image of the Gulf of Oman has been crafted using a combination of red, green, and blue wavelengths of light, specifically at 630, 532, and 465 nanometers, respectively.</p>



<h2 class="wp-block-heading" id="h-enhanced-image-of-the-gulf-of-oman">Enhanced image of the Gulf of Oman</h2>



<p>The image Knuble selected is not a natural-color representation but an enhanced one designed to highlight specific details within the water.&nbsp;</p>



<p>This technique allows for a more vivid portrayal of oceanic features, such as the swirling bands of a <a href="https://www.earth.com/news/phytoplankton-remain-surprisingly-active-underneath-arctic-sea-ice/" target="_blank" rel="noreferrer noopener">phytoplankton</a> bloom. Jeremy Werdell, PACE project scientist at NASA’s Goddard Space Flight Center, noted: "The image highlights the beauty and complexity of that area."</p>



<h2 class="wp-block-heading" id="h-phytoplankton-bloom-in-the-gulf-of-oman-nbsp">Phytoplankton bloom in the Gulf of Oman&nbsp;</h2>



<p>Phytoplankton blooms, like the one visible in the Gulf of Oman, occur when environmental conditions - such as light availability and nutrient levels - are favorable, leading to rapid growth. These blooms can have significant ecological impacts.&nbsp;</p>



<p>The swirls of green seen in the image likely include Noctiluca scintillans, a type of marine dinoflagellate known for its striking appearances. However, despite their beauty, Noctiluca blooms can deplete <a href="https://www.earth.com/news/cautionary-tale-todays-ocean-oxygen-levels-may-have-cascading-impacts/" target="_blank" rel="noreferrer noopener">oxygen levels</a> in the water, resulting in hypoxia and creating dead zones that severely impact marine life.</p>



<h2 class="wp-block-heading" id="h-changing-dynamics-in-the-arabian-sea-nbsp">Changing dynamics in the Arabian Sea&nbsp;</h2>



<p>The changing dynamics in the Arabian Sea are also noteworthy. Historically rich in diatoms, vital components of the marine food chain, the region now sees a dominance of Noctiluca. This shift could be attributed to changes in water stratification and nutrient availability, with Noctiluca thriving under conditions that are less favorable for diatoms.</p>



<p>One of the groundbreaking aspects of the OCI is its ability to detect hundreds of different wavelengths of light. This capability is not just about capturing beautiful images; it provides a critical tool for identifying and differentiating between various types of phytoplankton from space. Previously, such determinations could only be made through direct water samples.</p>



<h2 class="wp-block-heading" id="h-tracking-the-health-of-marine-ecosystems-nbsp">Tracking the health of marine ecosystems&nbsp;</h2>



<p>The PACE mission is poised to transform our understanding of oceanic and atmospheric interactions. By providing detailed, high-resolution images and data, the satellite will enable scientists to monitor environmental changes, track the health of <a href="https://www.earth.com/news/overfishing-and-habitat-degradation-have-devastated-marine-ecosystems/" target="_blank" rel="noreferrer noopener">marine ecosystems</a>, and better understand the global climate system. </p>



<p>This mission highlights the importance of continued investment in space technology and research, offering a clearer view of our planet's intricate and changing natural systems.</p>



<h2 class="wp-block-heading" id="h-gulf-of-oman">Gulf of Oman</h2>



<p>The Gulf of Oman is a strategically significant body of water located in the Middle East, connecting the Arabian Sea with the Strait of Hormuz, which then leads into the Persian Gulf. This gulf borders several countries including Iran, Oman, Pakistan, and the United Arab Emirates, making it a crucial geographic and economic zone.</p>



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



<p>The Gulf of Oman is particularly important for its role in global oil transportation. A large percentage of the world's petroleum, as it is shipped from the oil-rich countries of the Persian Gulf, passes through the Strait of Hormuz into the Gulf of Oman and then to various destinations across the globe.&nbsp;</p>



<p>This makes the area not only economically significant but also a hot spot for geopolitical tensions and security concerns.</p>



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



<p>Ecologically, the Gulf of Oman is diverse, hosting various species of <a href="https://www.earth.com/news/ocean-noise-is-getting-louder-what-does-this-mean-for-animals/" target="_blank" rel="noreferrer noopener">marine life</a> which support local fishing communities. However, the area faces environmental challenges, including the risk of oil spills and the impacts of industrialization and maritime traffic which threaten its marine ecosystems.</p>



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



<p>Additionally, the Gulf of Oman has a rich cultural history, influenced by the various civilizations that have inhabited its shores and traded across its waters. This history is reflected in the diverse cultures of the region today, making it a place of significant cultural heritage.</p>



<p>Image Credit: NASA Earth Observatory&nbsp;</p>



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The Gulf of Oman in the Middle East

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

<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 the Bermejo River and the Río Grande de Tarija, which flow through Argentina and Bolivia in South America. The photograph was captured by an astronaut onboard the International Space Station.</p>



<h2 class="wp-block-heading" id="h-meandering-rivers">Meandering rivers</h2>



<p>“The meandering rivers in this image are sourced in the Andes Mountains and generally flow southeast through valleys in the foothills - the region between the high mountains and plains. The Iruya River deposits particles of silt and clay as it flows into the valley centered in this image,” said NASA.</p>



<p>“Visible indications of the rivers’ shifting channels include river islands, point bars (on the inside curve of streams), and several meander scars. Such scars form when a river gets cut off from the main flow and fills in with sediment, soil, and vegetation.”</p>



<p>“Sediment from the adjacent highlands filled valleys that were formed by tectonic forces driving uplift of the Andes. These deposits are subsequently carried by rivers, such as the Iruya, along with new sediment to form the light-toned braided channels and the adjacent darker-toned floodplains. Nutrient-rich floodplain soils provide fertile ground for agricultural fields.”</p>



<h2 class="wp-block-heading" id="h-bermejo-river">Bermejo River</h2>



<p>The Bermejo River originates in the Bolivian <a href="https://www.earth.com/news/biodiversity-hotspots-are-shrinking-in-the-andes-mountains/" target="_blank" rel="noreferrer noopener">Andes</a> and flows into Argentina. It plays a crucial role in the geographical and ecological landscape of the region. The river's course is characterized by its meandering path through the Gran Chaco plain, making it a significant river in the region's hydrological system.</p>



<h3 class="wp-block-heading" id="h-economic-importance">Economic importance</h3>



<p>The Bermejo River is vital for agriculture, providing essential water resources for irrigation. It also has potential for hydroelectric power generation.</p>



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



<p>The diverse habitats created by the Bermejo River, including its riverbanks, floodplains, and adjacent forests, support rich biodiversity. However, the wildlife in this region faces threats from habitat destruction, pollution, and climate change, making conservation efforts critical for their survival.</p>



<p><a href="https://www.earth.com/news/jaguars-in-the-amazon-are-threatened-by-climate-extremes/" target="_blank" rel="noreferrer noopener">Jaguars</a> are the apex predators of this region, and are occasionally spotted along the riverbanks, where they hunt. Large, herbivorous mammals called tapirs are found in the forests around the Bermejo River. They often visit the river to drink and cool off.</p>



<p>Capibaras, the world’s largest rodents, are commonly found in the wetlands and along the river edges.</p>



<p>Jabirus, the tallest flying birds in South and Central America, can often be seen in wetlands along the Bermejo River. Toco toucans, known for their colorful bills, can be found in the forested areas near the river.</p>



<h2 class="wp-block-heading" id="h-rio-grande-de-tarija">Río Grande de Tarija</h2>



<p>The Río Grande de Tarija, also known in its lower stretches as the Guadalquivir, flows primarily within Bolivia. It is a critical watercourse in the Tarija Department, contributing significantly to the region's agriculture and livelihoods.</p>



<h3 class="wp-block-heading" id="h-economic-importance-0">Economic importance</h3>



<p>This river is essential for irrigation, supporting a variety of crops and contributing to the local economy. The surrounding lands are fertile and productive, thanks to the river's water.</p>



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



<p>Similar to other rivers, the Río Grande de Tarija faces challenges such as water management issues, <a href="https://www.earth.com/news/predicting-the-effects-of-pollutants-on-river-ecosystems/" target="_blank" rel="noreferrer noopener">pollution</a>, and the impacts of climate change on its flow and health.</p>



<h3 class="wp-block-heading" id="h-wildlife-in-bolivian-rivers">Wildlife in Bolivian rivers</h3>



<p>River basins in Bolivia are home to a wide range of bird species, including various species of herons, egrets, kingfishers, and perhaps even some rarer species like the wattled jacana or the sunbittern. The diverse birdlife is attracted to the abundance of fish and the relatively untouched natural habitats along the river.</p>



<p>The Characidae family includes many fish species that are commonly found in South American rivers, such as tetras. They are known for their diversity and are a key part of the river's ecosystem, serving as both <a href="https://www.earth.com/news/diving-to-extremes-predatory-fish-frequent-the-oceans-twilight-zone/" target="_blank" rel="noreferrer noopener">predator</a> and prey.</p>



<p>Cichlids are another diverse group of fish that can be found in South American rivers. They play significant roles in their ecosystems as both predators and herbivores.</p>



<p>The rivers of Bolivia are also home to various catfish species, which are well adapted to life in muddy and turbulent waters. These include the armored catfish, which are often found clinging to rocks and logs.</p>



<p>Image Credit: NASA Earth Observatory/ ISS Crew Earth Observations Facility/ Earth Science and Remote Sensing Unit, Johnson Space Center</p>



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

The Río Grande de Tarija and Bermejo River in South America

<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 Columbia Glacier, a tidewater glacier located in Prince William Sound on the south coast of Alaska. It is one of the most rapidly changing <a href="https://www.earth.com/news/melting-glaciers-pose-great-threat-to-biodiversity-in-mountain-ranges/" target="_blank" rel="noreferrer noopener">glaciers</a> in the world and has been closely studied for the insights it provides into glacial mechanics and climate change impacts. </p>



<p>"Since the early 1980s, the Columbia Glacier has retreated more than 20 km and lost about half of its total volume. This one glacier accounts for nearly half of the ice lost in the Chugach Mountains," noted ESA.</p>



<p>"The changing climate is thought to have caused its retreat. Until 1980, when its rapid and constant retreat began, the glacier’s terminus was observed at the northern edge of Heather Island, which lies near the end of Columbia Bay, the inlet into which the glacier currently flows before draining into Prince William Sound."</p>



<p>"This satellite image, acquired in September 2023, shows instead the deep mostly ice-free Columbia Bay dotted with numerous icebergs and fragmented sea-ice."</p>



<h2 class="wp-block-heading" id="h-dramatic-calving-events">Dramatic calving events</h2>



<p>The Columbia Glacier is known for its dramatic calving events, where large chunks of ice break off from the glacier's terminus and fall into the sea, becoming icebergs. This process has been particularly active as the glacier has retreated, contributing to hazards for shipping in Prince William Sound.</p>



<p>The glacier has been the focus of extensive scientific research, serving as a case study for understanding the dynamics of tidewater glaciers and their responses to <a href="https://www.earth.com/news/preparing-for-ocean-acidification-a-silent-killer-of-climate-change/" target="_blank" rel="noreferrer noopener">climate change</a>. Studies have used satellite imagery, field observations, and modeling to track its changes over time.</p>



<h2 class="wp-block-heading" id="h-climate-impact-on-the-columbia-glacier">Climate impact on the Columbia Glacier</h2>



<p>"Columbia is just one of the many glaciers suffering from the effects of climate change. Most of the glaciers around the world are losing mass. However, before the advent of satellites, measuring their retreat and studying their vulnerability to climate change was difficult considering their size, remoteness and rugged terrain they occupy," said ESA.</p>



<p>"Different satellite instruments now can gather information systematically and over large areas, providing an effective means to monitor change, keep track of all calving stages and quantify the melting rate and their contribution to sea-level rise."</p>



<h2 class="wp-block-heading">More about Columbia Glacier&nbsp;</h2>



<p>Columbia Glacier flows from the Chugach Mountains into Columbia Bay. It was once one of the largest contributors to <a href="https://www.earth.com/news/sea-level-rise-will-cost-coastal-cities-over-1-trillion-in-damages/" target="_blank" rel="noreferrer noopener">sea level rise</a> due to its significant ice loss. </p>



<p>The glacier's dynamics are influenced by its interaction with water, where the terminus meets the ocean. As the glacier flows into the sea, large chunks of ice calve off the front, leading to dramatic scenes of ice crashing into the <a href="https://www.earth.com/news/shelf-sediment-ocean-composition/" target="_blank" rel="noreferrer noopener">ocean</a>. This process has been intensifying due to warmer temperatures and changes in water circulation, which undermine the ice from below.</p>



<p>Columbia Glacier's retreat has significant implications for marine navigation and local ecosystems. The increase in icebergs calving into the bay poses hazards to ships, while the fresh meltwater impacts local water temperatures and salinity, affecting the habitat of fish and other marine life.</p>



<h2 class="wp-block-heading">Melting glaciers and ocean composition&nbsp;</h2>



<p>Glaciers, which are large masses of accumulated snow and ice, store about 69 percent of the world's fresh water. As the climate warms, these glaciers increasingly melt and release freshwater into nearby seas and the ocean at large.</p>



<h3 class="wp-block-heading">Influx of freshwater</h3>



<p>This influx of freshwater from <a href="https://www.earth.com/news/melting-glaciers-pose-great-threat-to-biodiversity-in-mountain-ranges/" target="_blank" rel="noreferrer noopener">melting glaciers</a> alters the salinity (salt concentration) of the ocean water. Since freshwater is less dense than saltwater, its addition can lead to stratification in which lighter, less salty water layers on top of denser, saltier water. </p>



<p>This stratification can disrupt ocean currents, which are driven in part by differences in water density and temperature. These currents are crucial for regulating global climate by distributing heat and nutrients around the planet.</p>



<h3 class="wp-block-heading">Changes in salinity&nbsp;</h3>



<p>Furthermore, changes in <a href="https://www.earth.com/news/human-induced-changes-in-ocean-salinity-threaten-biodiversity-and-marine-ecosystems/" target="_blank" rel="noreferrer noopener">salinity</a> can affect marine life, which often has narrow salinity tolerance ranges. For example, shifts in salinity can impact breeding cycles, migration patterns, and the availability of nutrients. </p>



<h3 class="wp-block-heading">Global carbon cycle</h3>



<p>As the ocean's composition changes, its capacity to absorb carbon dioxide from the atmosphere could also be altered, affecting the global carbon cycle and, by extension, climate change feedback mechanisms.</p>



<p>The melting of glaciers contributes to more pronounced changes in ocean conditions, impacting everything from global climate systems to local ecosystems in marine environments.</p>



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



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Columbia Glacier on the south coast of Alaska

Illustration,Of,The,Sun,Showing,Formidable,Solar,Flares

"Extreme" and very rare G5-level geomagnetic storm hits Earth

On Friday, April 12, 2024, at 6:54 pm EDT, extreme...

Two,Women,Sisters,Or,Friends,Sharing,A,Smoke,Or,Joint

<p>As cannabis gains popularity and acceptance, a growing concern arises for breastfeeding mothers who use the drug. A recent study has shed light on the presence of THC, the psychoactive component of <a href="https://www.earth.com/news/recreational-cannabis-use-protects-against-cognitive-decline/" target="_blank" rel="noreferrer noopener">cannabis</a>, in the breast milk produced by these mothers. </p>



<p>The findings raise important questions about the potential effects on infants and the need for further research.</p>



<h2 class="wp-block-heading" id="h-milk-moms-and-marijuana-a-delicate-balance">Milk, moms, and marijuana: A delicate balance</h2>



<p>Courtney Meehan, a biological anthropologist at <a href="https://wsu.edu/" target="_blank" rel="noreferrer noopener">Washington State University</a>, led a groundbreaking study published in the journal <em>Breastfeeding Medicine</em>. </p>



<p>The research team analyzed breast milk donated by 20 breastfeeding mothers who used <a href="https://www.earth.com/news/cannabis-smokers-not-lazy-unmotivated-despite-stereotypes/" target="_blank" rel="noreferrer noopener">cannabis</a>, aiming to uncover how long cannabinoids, like THC, persisted in breast milk.</p>



<p>"Breastfeeding parents need to be aware that if they use <a href="https://www.earth.com/news/smoking-cannabis-significantly-increases-the-risk-of-heart-attack/" target="_blank" rel="noreferrer noopener">cannabis</a>, their infants are likely consuming cannabinoids via the milk they produce, and we do not know whether this has any effect on the developing infant," said Meehan, the study's corresponding author.</p>



<h2 class="wp-block-heading" id="h-thc-levels-found-in-breast-milk">THC levels found in breast milk</h2>



<p>The researchers discovered that the amount of THC detected in the breast milk was low, with an estimated average of 0.07 mg of THC per day consumed by infants. </p>



<p>To put this into perspective, a common <a href="https://www.earth.com/news/u-s-plans-to-reclassify-marijuana-and-ease-restrictions/" target="_blank" rel="noreferrer noopener">low-dose edible</a> contains 2 mg of THC. However, the research team stressed that it is unknown whether this amount has any impact on the infant.</p>



<p>"Human milk has compounds called lipids, and cannabinoids are lipophilic, meaning they dissolve in those lipids. This may mean that <a href="https://www.earth.com/news/cannabis-legalization-does-not-increase-youth-substance-abuse/" target="_blank" rel="noreferrer noopener">cannabinoids</a> like THC tend to accumulate in breast milk -- and potentially in infants who drink it," explained Meehan.</p>



<h2 class="wp-block-heading" id="h-knowns-and-unknowns-of-cannabis-and-breast-milk">Knowns and unknowns of cannabis and breast milk</h2>



<p>The study revealed that, unlike alcohol, when THC was detected in breast milk, there was no consistent time when its concentration peaked and started to decline. This makes it difficult for breastfeeding mothers to avoid feeding their infants when <a href="https://www.earth.com/news/cannabis-potency-linked-to-dramatic-rise-in-psychiatric-disorders/" target="_blank" rel="noreferrer noopener">THC levels</a> are at their highest.</p>



<p>"There was such a range. If you're trying to avoid breastfeeding when the <a href="https://www.earth.com/news/cannabis-impairment-is-difficult-to-determine-using-police-field-sobriety-tests/" target="_blank" rel="noreferrer noopener">concentration of THC</a> peaks, you're not going to know when THC is at its peak in the breast milk," said lead author Elizabeth Holdsworth, who worked on this study while a WSU post-doctoral researcher and is now on the faculty of <a href="https://www.osu.edu/" target="_blank" rel="noreferrer noopener">The Ohio State University</a>.</p>



<p>Furthermore, scientists know almost nothing about how many commonly used drugs may impact breastfeeding babies, partly because women, especially those who are breastfeeding, have historically been left out of clinical trials on medicines.</p>



<h2 class="wp-block-heading" id="h-thoughtful-decisions-and-therapeutic-use">Thoughtful decisions and therapeutic use</h2>



<p>A related qualitative study by the research team revealed that many breastfeeding moms are using cannabis for <a href="https://www.earth.com/news/chemical-found-in-cannabis-plants-can-actually-reduce-cannabis-induced-anxiety/" target="_blank" rel="noreferrer noopener">therapeutic purposes</a> -- to manage anxiety, other mental health issues, or chronic pain. The mothers often chose cannabis over using other medications because they felt it was safer.</p>



<p>"Our results suggest that mothers who use cannabis are being thoughtful in their decisions," said co-author Shelley McGuire, a <a href="https://www.uidaho.edu/" target="_blank" rel="noreferrer noopener">University of Idaho</a> professor who studies maternal-infant nutrition. "These women were mindful about their choices. This is far from a random lifestyle choice."</p>



<h2 class="wp-block-heading" id="h-substantial-rigorous-research-needed-on-thc-and-breast-milk">Substantial, rigorous research needed on THC and breast milk</h2>



<p>While some research has been done regarding alcohol, with guidelines for new mothers to wait at least two hours after consuming alcohol before breastfeeding, nothing similar has been developed for cannabis.</p>



<p>"This is an area that needs substantial, rigorous research for moms to know what's best," McGuire said.</p>



<p>The collaborative research team is currently working to address some of that knowledge gap with further research on cannabis use in breastfeeding moms, holistic composition of the milk they produce, and its effects on infant development.</p>



<h2 class="wp-block-heading" id="h-navigating-cannabis-use-as-a-breastfeeding-mother">Navigating cannabis use as a breastfeeding mother</h2>



<p>In summary, as the landscape of cannabis use continues to evolve, breastfeeding mothers face a unique set of challenges and uncertainties. </p>



<p>The Washington State University-led study has taken the first steps in unraveling the complex relationship between cannabis use and breastmilk, but it has also highlighted the urgent need for further research. </p>



<p>Only through rigorous scientific inquiry can we provide breastfeeding mothers with the knowledge and support they need to make informed decisions about their health and the well-being of their infants. </p>



<p>By prioritizing this area of study, we can work towards creating a safer, more informed environment for mothers and their babies, ensuring that the choices they make are grounded in evidence and understanding.</p>



<p>The full study was published in the journal <em><a href="https://www.liebertpub.com/doi/10.1089/bfm.2024.0021" target="_blank" rel="noreferrer noopener">Breastfeeding Medicine</a></em>.</p>



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



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THC from cannabis use lingers in breast milk of new mothers

As cannabis gains popularity and acceptance, a growing concern arises...

<p><strong>Update: May 10, 2024, 7:55 PM EDT</strong></p>



<p>A series of powerful solar flares and eruptions from the sun are set to trigger a <a href="https://www.earth.com/news/noaa-issues-severe-geomagnetic-storm-watch-first-time-since-2005/" target="_blank" rel="noreferrer noopener">severe geomagnetic storm</a>, potentially bringing breathtaking displays of auroras, the northern lights, to skies across the United States. </p>



<p>The National Oceanic and Atmospheric Administration's Space Weather Prediction Center (<a href="https://www.swpc.noaa.gov/" target="_blank" rel="noreferrer noopener">SWPC</a>) issued a rare severe geomagnetic storm watch on Thursday, the first since 2005.</p>



<p>Today, as the storms began striking Earth, the forecast predicts that auroras could be visible as far south as Florida and Texas in the southeast and as low as southern California on the west coast.</p>



<h2 class="wp-block-heading" id="h-solar-flares-and-auroras">Solar flares and auroras</h2>



<p>Observers have witnessed severe (G4) geomagnetic storm conditions today. Several additional Earth-directed Coronal Mass Ejections (CMEs) are in transit to Earth's outer atmosphere, making it highly likely that geomagnetic storming will persist for several days.</p>



<p>The CMEs are associated with a large and magnetically complex sunspot cluster, known as NOAA <a href="https://www.earth.com/news/earth-prepares-impact-three-cme-events-solar-storms/" target="_blank" rel="noreferrer noopener">region 3664</a>, which continues to grow and now spans an impressive 17 times the diameter of Earth. Several strong flares have been detected in this region, contributing to the heightened alert level.</p>



<p>Shawn Dahl, a service coordinator at the SWPC in Boulder, Colorado, emphasized the significance of the event, stating, "We have a rare event on our hands."</p>



<h2 class="wp-block-heading" id="h-understanding-the-aurora-borealis">Understanding the aurora borealis</h2>



<p>The northern lights, or <a href="https://www.earth.com/news/the-solar-wind-which-creates-beautiful-auroras-on-earth-is-now-less-mysterious/" target="_blank" rel="noreferrer noopener">aurora borealis</a>, are created when charged particles ejected from <a href="https://www.earth.com/news/sun-covered-with-moss-peculiar-structure-sunspot-groups/" target="_blank" rel="noreferrer noopener">the sun</a> during solar storms collide with Earth's magnetic field. </p>



<p>These energetic particles interact with atoms and molecules in the planet's upper atmosphere, resulting in the mesmerizing, colorful displays we observe in the night sky. </p>



<p>While typically seen at high latitudes, intense periods of <a href="https://www.earth.com/news/team-creates-video-showing-the-sun-in-gamma-rays-over-a-14-year-period/" target="_blank" rel="noreferrer noopener">solar activity</a> can cause the auroras to be visible much farther south than usual.</p>



<h2 class="wp-block-heading" id="h-viewing-the-northern-lights">Viewing the northern lights</h2>



<p>The SWPC's aurora dashboard provides short-term forecasts for those hoping to catch a glimpse of the northern lights. For the best viewing experience, find a dark location far from city lights on a clear night. </p>



<p>Keep an eye on the dashboard and local weather forecasts to maximize your chances of witnessing this spectacular celestial event.</p>



<h2 class="wp-block-heading" id="h-potential-impacts-of-severe-solar-storms">Potential impacts of severe solar storms</h2>



<p>While amplified northern lights displays are a breathtaking sight, severe solar storms can also have disruptive effects on Earth. </p>



<p>Coronal mass ejections, the clouds of plasma and charged particles unleashed by solar flares, have the power to disrupt communications and power grids on Earth and interfere with satellites in space when directed at our planet. </p>



<p>The SWPC has notified operators of these systems to take protective action in anticipation of the incoming solar activity.</p>



<ul>
<li><strong>Induced Currents</strong>: Power system voltage irregularities and false alarms on some protection devices.</li>



<li><strong>Spacecraft</strong>: Surface charging and increased drag on low Earth-orbit satellites, potentially causing orientation problems.</li>



<li><strong>Navigation</strong>: Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error.</li>



<li><strong>Radio</strong>: Intermittent HF (high frequency) radio communication.</li>



<li><strong>Aurora</strong>: Northern lights may be seen as low as Florida and Texas in the southern states, down to Missouri in the Midwest, and down to Southern California on the west coast.</li>
</ul>



<h2 class="wp-block-heading" id="h-increased-solar-activity-expected">Increased solar activity expected</h2>



<p>The sun's activity follows an <a href="https://www.earth.com/news/solar-storms-will-intensify-then-slow-as-the-solar-cycle-peaks-in-early-2024/" target="_blank" rel="noreferrer noopener">11-year cycle</a>, alternating between periods of minimum and maximum activity. The current cycle, which began in late 2019, is predicted to reach its peak in July 2025, according to NOAA and NASA forecasts. </p>



<p>As we approach this peak, we can expect more frequent and intense solar events, potentially leading to more opportunities to witness the awe-inspiring northern lights.</p>



<p>With several moderate to strong solar flares detected since Wednesday morning and at least five flares and their associated coronal mass ejections apparently directed at Earth, the SWPC warns that geomagnetic storm conditions could persist through the weekend. </p>



<p>As we eagerly await the arrival of this rare celestial event, remember to stay informed, stay safe, and, most importantly, take a moment to marvel at the wonders of our universe.</p>



<h2 class="wp-block-heading" id="h-rare-opportunity-to-witness-our-universe-in-action">Rare opportunity to witness our universe in action</h2>



<p>In summary, as we eagerly anticipate the arrival of this rare and awe-inspiring celestial event, remember to stay informed about the latest updates from Earth.com and the NOAA's Space Weather Prediction Center.</p>



<p>Take necessary precautions to protect sensitive equipment, and find a dark, clear location to maximize your chances of witnessing the northern lights. </p>



<p>Embrace this opportunity to marvel at the wonders of our universe, and share the experience with friends and family. </p>



<p>The severe solar storm this weekend promises to paint the skies with breathtaking auroras, reminding us of the powerful and beautiful forces at work in the cosmos.</p>



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



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Auroras expected all weekend across the U.S. as massive solar storm hits Earth

Update: May 10, 2024, 7:55 PM EDT A series of...

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<p><br />
<span style="font-weight: 400;">Sunrise from the International Space Station 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;"> (ESA) features the captivating timelapse of a sunrise as it is appears from the International Space Station (ISS).</span></p>
<p><span style="font-weight: 400;">According to the ESA, the space station encounters 16 sunrises and sunsets every single day, which is due to the fact that the ISS completes an orbit around the Earth every 90 minutes.</span></p>
<p><span style="font-weight: 400;">These photos were captured by German astronaut Alexander Gerst at a rate of two images per second. The International Space Station travels at a brisk 17,100 miles per hour. That means it orbits Earth every 90 minutes—so it sees a sunrise every 90 minutes. Thus, every day, the residents of the ISS witness 16 sunrises and 16 sunsets. </span></p>
<p><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>
<p><i><span style="font-weight: 400;">Video Credit: European Space Agency</span></i></p>