<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 Ruang, a small volcanic island in North Sulawesi, Indonesia. The tranquil environment of Ruang was shattered by a powerful volcanic eruption on the night of April 16, 2024.</p>



<p>This event has left the island's 800 residents grappling with its devastating aftermath, while scientists are assessing its potential global effects.</p>



<h2 class="wp-block-heading" id="h-a-violent-awakening-on-ruang">A violent awakening on Ruang</h2>



<p>Ruang, located in the Sangihe Islands arc, is known for its long history of <a href="https://www.earth.com/news/volcanic-eruptions-play-an-overlooked-role-in-earths-climate/" target="_blank" rel="noreferrer noopener">volcanic activity</a>, but the intensity of the latest eruption has been particularly alarming. The <a href="https://www.earth.com/news/explosive-volcanic-eruption-triggered-an-hours-long-thunderstorm/" target="_blank" rel="noreferrer noopener">eruption</a> produced explosive discharges, sending vast plumes of ash and gas soaring into the stratosphere. The force of nature transformed lush greenery into a gray wasteland.</p>



<p>“Late on April 16, 2024, the mountain roared to life, unleashing a series of explosive eruptions that, at times, sent plumes of ash and gas billowing high into the stratosphere. The eruption also bombarded the island with tephra, small pebbles of lapilli, and fine shards of pulverized rock called ash,” said NASA.</p>



<h2 class="wp-block-heading" id="h-extensive-damage-and-humanitarian-efforts">Extensive damage and humanitarian efforts</h2>



<p>The eruption's immediate impact was severe, with settlements on the north side of Ruang and Laingpatehi village experiencing extensive damage due to volcanic debris.&nbsp;</p>



<p>More than 500 houses were destroyed or severely damaged, according to Indonesia’s disaster management agency, Badan Nasional Penanggulangan Bencana (BNPB). The heavy ashfall also impacted local agriculture, damaging crops and farms.&nbsp;</p>



<p>In response to the crisis, the Sam Ratulangi International Airport in nearby Manado was temporarily closed, disrupting travel and causing widespread flight cancellations. It was not until April 22 that the airport could reopen, following significant cleanup efforts and a decrease in the volcanic threat level.</p>



<h2 class="wp-block-heading" id="h-scientific-analysis-and-global-concerns">Scientific analysis and global concerns</h2>



<p>The eruption has attracted significant scientific interest due to the vast quantities of ash and sulfur dioxide it emitted. Atmospheric scientist Ghassan Taha from NASA’s Goddard Space Flight Center noted, "We expect to see aerosol particles circulating in the stratosphere for weeks, if not months." This observation is critical as particles reaching this altitude can have extensive, albeit temporary, effects on global climate patterns.</p>



<p>Volcanologist Simon Carn from Michigan Technological University reported that the eruption released between 0.3 to 0.5 teragrams of sulfur dioxide on April 17 and 18. These levels, while substantial, fall below the threshold generally required to affect global temperatures significantly.&nbsp;</p>



<p>For context, the 1991 Mount Pinatubo eruption, which had a pronounced cooling effect on the Earth's climate, released approximately 20 teragrams of sulfur dioxide.</p>



<h2 class="wp-block-heading" id="h-preparedness-and-future-risks">Preparedness and future risks</h2>



<p>In light of Ruang's active volcanic history and the potential for further eruptions, local authorities remain vigilant. The risk of lahars and tsunamis prompted immediate evacuations and multiple tsunami warnings, though, fortunately, no substantial tsunamis have occurred thus far. Over 16,000 residents have been evacuated from the most vulnerable areas, a move that has likely prevented any fatalities or serious injuries.</p>



<p>The 2024 <a href="https://www.earth.com/news/underwater-volcanic-eruptions-are-more-harmful-than-previously-believed/" target="_blank" rel="noreferrer noopener">eruption</a> of Ruang is a stark reminder of the powerful and often unpredictable nature of volcanic islands. While the local and immediate impacts are devastating, the eruption also offers valuable data for scientists studying the broader implications of such natural events on atmospheric conditions and climate. </p>



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



<p>The population on Ruang is small, with residents primarily engaged in subsistence fishing and agriculture, which is typical of remote Indonesian islands. The island's terrain and soil fertility, influenced by volcanic ash, may support the cultivation of certain crops that are adapted to such conditions.</p>



<p>The Ruang volcano rises to about 725 meters above sea level, making it a prominent feature in the region. This area is part of the volcanic arc that includes numerous volcanoes produced by the subduction of the oceanic plate under the continental margin.</p>



<p>The active stratovolcano has had several recorded eruptions in history, with significant activity occurring in 1871, 1873, and 2002.&nbsp;</p>



<p>The image was captured by the Operational Land Imager (OLI) on April 20, 2024.</p>



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



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Ruang volcano eruption has devastated the tranquil island

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>The tallest flying bird found in South and Central America, jabirus 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 are appreciated by aquarium enthusiasts worldwide and 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 <a href="https://earthobservatory.nasa.gov/" target="_blank" rel="noreferrer noopener">NASA Earth Observatory</a> features the delta of the Ebro River on the northeast coast of Spain, captured by the Copernicus Sentinel-2 mission.</p>



<h2 class="wp-block-heading" id="h-ebro-river">Ebro River</h2>



<p>“Stretching across 910 km of northern Spain, the Ebro River is the second-longest river in the Iberian Peninsula. In the image, it can be seen as a green line winding its way through the peninsula before flowing into the Mediterranean, shaping the Ebro Delta,” noted ESA.</p>



<p>“The Ebro River discharges more water into the sea than any other river in Spain. As suspended sediment flows from the river’s mouth, it tints the coastal waters with a turquoise hue.”</p>



<h2 class="wp-block-heading" id="h-ebro-delta">Ebro Delta</h2>



<p>The Ebro Delta is one of the largest <a href="https://www.earth.com/news/wetland-methane-emissions-have-surged-at-high-latitudes/">wetland areas</a> in the western Mediterranean region. The river's basin is the largest in Spain, covering about 85,000 square kilometers.</p>



<h2 class="wp-block-heading" id="h-historical-significance-nbsp">Historical significance&nbsp;</h2>



<p>Historically, the Ebro River has been significant in numerous battles, including the famous Battle of the Ebro during the Spanish Civil War, which was one of the war's longest and deadliest conflicts.&nbsp;</p>



<h2 class="wp-block-heading" id="h-economic-significance-nbsp">Economic significance&nbsp;</h2>



<p>Economically, the Ebro plays a crucial role in agriculture, particularly in regions like La Rioja and Navarre, which are known for their vineyards. Additionally, the river supports various industries and hydroelectric power generation.</p>



<h2 class="wp-block-heading" id="h-ecological-significance">Ecological significance</h2>



<p>The Ebro Delta is ecologically rich, providing habitat for diverse bird species. It is also a vital area for rice cultivation in Spain.&nbsp;</p>



<h3 class="wp-block-heading" id="h-nature-reserve">Nature reserve</h3>



<p>“Most of the delta comprises the Ebro Delta Nature Reserve. With its protected wetlands, beaches, marshes, salt pans and estuaries, this reserve provides a natural habitat for numerous migratory birds and waterfowl,” said ESA.</p>



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



<p>The river and its delta face environmental challenges such as pollution, water extraction for irrigation, and the impacts of <a href="https://www.earth.com/news/climate-change-may-have-altered-river-flow-worldwide/">climate change</a>, which threaten its ecosystem and the sustainability of its water resources.</p>



<h2 class="wp-block-heading" id="h-the-northeast-coast-of-spain">The northeast coast of Spain</h2>



<p>The northeast coast of Spain is a vibrant and diverse region, characterized by its rich history, unique culture, and stunning landscapes. </p>



<p>It includes the autonomous communities of Catalonia, which features the dynamic city of Barcelona, and part of the Valencian Community. This area is also part of what is known as the Costa Brava, which stretches from the town of Blanes up to the French border.</p>



<h3 class="wp-block-heading" id="h-geography">Geography</h3>



<p>The <a href="https://www.earth.com/news/human-activity-impacts-97-percent-of-the-worlds-coastline/">coastline</a> is renowned for its rugged beauty, with rocky cliffs, secluded coves, and small beaches. The interior regions feature mountains such as the Pyrenees, which offer skiing in winter and hiking in the summer.</p>



<h3 class="wp-block-heading" id="h-cultural-heritage">Cultural heritage</h3>



<p>The area has a strong cultural identity, particularly in Catalonia, where there is a significant movement for independence. The Catalan language is widely spoken alongside Spanish. The region is also known for its festivals, architecture (notably the works of Antoni Gaudí in Barcelona), and traditional dances like the Sardana.</p>



<h3 class="wp-block-heading" id="h-cuisine">Cuisine</h3>



<p>The cuisine is a delightful mix of fresh seafood from the Mediterranean, traditional Catalan dishes like "pa amb tomàquet" (bread with tomato), and rice dishes such as paella in the Valencian region. The area is also famous for its wines, including the sparkling wine Cava.</p>



<h3 class="wp-block-heading" id="h-tourism">Tourism</h3>



<p>The northeast coast attracts millions of tourists each year due to its beautiful beaches, historical sites, and vibrant cities. Barcelona, in particular, is a major tourist destination with attractions like the Sagrada Familia, Park Güell, and the bustling La Rambla.</p>



<h3 class="wp-block-heading" id="h-economy">Economy</h3>



<p>The economy of the northeast coast is one of the most dynamic in Spain, with Barcelona serving as a major hub for trade, education, entertainment, and technology.</p>



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



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The Ebro River on the northeast coast of Spain

<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 United Arab Emirates, where a slow-moving storm system dumped more than a year's worth of rainfall in just a few hours. </p>



<p>“The UAE’s National Center for Meteorology reported that eastern parts of the country measured up to 250 millimeters (10 inches) of rain in less than 24 hours. UAE, known for its dry desert climate, receives only about 140 to 200 millimeters (5.5 to 8 inches) of rainfall per year,” said NASA.</p>



<p>“Dubai International Airport recorded 119 millimeters on April 16, which is 1.5 times its typical annual rainfall. The deluge temporarily halted flights at the airport, which is among the world’s busiest for international travel.”</p>



<h2 class="wp-block-heading" id="h-heaviest-rainfall-on-record-in-the-united-arab-emirates-nbsp">Heaviest rainfall on record in the United Arab Emirates&nbsp;</h2>



<p>Authorities noted that this was the heaviest <a href="https://www.earth.com/news/record-heat-fueled-unexpected-and-deadly-storms-in-2023/" target="_blank" rel="noreferrer noopener">rainfall</a> on record in the United Arab Emirates. The news agency WAM called it a historic weather event that surpassed “anything documented since the start of data collection in 1949.”&nbsp;</p>



<p>“Heavy rain triggered flash flooding across eastern parts of the country, inundating roads and disrupting transportation,” said NASA. “The system first hit Oman on April 14 and continued to batter the UAE through most of the day on April 16.”&nbsp;</p>



<p>At least 18 people were killed in the <a href="https://www.earth.com/news/heavy-rainfall-events-in-the-northeast-are-set-to-increase-by-over-50-percent/" target="_blank" rel="noreferrer noopener">heavy rains</a> in Oman, including ten children that were swept away in a vehicle with one adult, according to a statement from the country’s National Committee for Emergency Management.&nbsp;</p>



<h2 class="wp-block-heading" id="h-strong-low-pressure-system">Strong low-pressure system</h2>



<p>Michael Mann, a climate scientist at the University of Pennsylvania, noted that three low-pressure systems formed a train of <a href="https://www.earth.com/news/thunderstorms-are-becoming-more-intense-due-to-climate-change/" target="_blank" rel="noreferrer noopener">storms</a> slowly moving along the jet stream - the river of air that moves weather systems - toward the Persian Gulf.&nbsp;</p>



<p>“The strong low-pressure system delivered multiple rounds of high winds and heavy rain to the northern and eastern parts of the country,” said NASA. “Some areas remained flooded on April 19, when Landsat 9 passed over the region for the first time since the storms.”&nbsp;</p>



<p>Climate experts attribute such extreme weather events to <a href="https://www.earth.com/news/limiting-global-warming-to-1-5-degrees-celsius-would-save-billions-of-lives/" target="_blank" rel="noreferrer noopener">global warming</a>. According to a report from Reuters, researchers anticipate that climate change will lead to hotter temperatures, increased humidity, and a greater risk of <a href="https://www.earth.com/news/seeking-ways-to-prevent-flooding-caused-by-climate-change/" target="_blank" rel="noreferrer noopener">flooding</a> in parts of the Gulf region. “Countries like the UAE where there is a lack of drainage infrastructure to cope with heavy rains can suffer the most,” the report stated.&nbsp;</p>



<h2 class="wp-block-heading" id="h-more-about-the-united-arab-emirates-nbsp">More about the United Arab Emirates&nbsp;</h2>



<p>The United Arab Emirates (UAE) is a federation of seven emirates located on the eastern side of the Arabian Peninsula. It borders Oman and Saudi Arabia, and has maritime borders with Iran and Qatar in the Persian Gulf. Established as a federation in 1971, the UAE has rapidly developed into one of the most modern and wealthy nations in the world, largely thanks to its vast oil and natural gas reserves.</p>



<p>Abu Dhabi serves as the capital and is the largest emirate, both in terms of land area and economy, largely because it holds the majority of the UAE's oil reserves. Dubai is the most populous city and is renowned globally for its spectacular skyscrapers, including the Burj Khalifa, the tallest building in the world, as well as its bustling ports, and vibrant tourism and shopping sectors.</p>



<p>The UAE has a diverse and multicultural society with a significant expatriate population, drawn by business opportunities and the tax-free living in many sectors. The official language is Arabic, though English is widely spoken, especially in business and educational settings.</p>



<p>Politically, the UAE is a federal absolute monarchy. It is governed by a Supreme Council of Rulers made up of the seven emirs, who appoint the prime minister and the cabinet. The country has made significant strides in terms of infrastructure and healthcare, and it continues to invest heavily in various sectors including renewable energy, education, and technology.</p>



<p>Culturally, the UAE balances its rapid modernization with a strong commitment to traditional Arab culture. The heritage of the desert Bedouin lifestyle is celebrated with falconry, camel racing, and traditional dance remaining integral to its cultural festivities. The nation is also a major hub for international arts and sports events, enhancing its global profile and cultural footprint.</p>



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



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Storms dumped record rainfall in the United Arab Emirates

<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 barred spiral galaxy NGC 3783, which is located about 130 million light-years away in the constellation Centaurus. NGC 3783 is also the most prominent of a galaxy group (by the same name) that contains 47 <a href="https://www.earth.com/news/james-webb-captures-galaxies-that-are-too-old-to-exist/" target="_blank" rel="noreferrer noopener">galaxies</a>. </p>



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



<p>“Like galaxy clusters, galaxy groups are aggregates of gravitationally bound galaxies. Galaxy groups, however, are less massive and contain fewer members than <a href="https://www.earth.com/news/titanic-galaxy-cluster-collision-defies-all-current-understanding-of-the-universe/" target="_blank" rel="noreferrer noopener">galaxy clusters</a> do: where galaxy clusters can contain hundreds or even thousands of constituent galaxies, galaxy groups do not typically include more than 50,” noted ESA.</p>



<p>“The Milky Way is actually part of a galaxy group, known as the Local Group, which contains two other large galaxies (Andromeda and the Triangulum galaxy), as well as several dozen satellite and dwarf galaxies.”</p>



<h2 class="wp-block-heading" id="h-hd-101274-a-blue-giant-star">HD 101274: A blue giant star</h2>



<p>The bright object that appears to the right of the galaxy is the star HD 101274. “The perspective in this image makes the star and the galaxy look like close companions, but this is an illusion. HD 101274 lies only about 1,530 light-years from Earth, meaning it is about 85 thousand times closer than NGC 3783,” explained ESA.&nbsp;</p>



<p>HD 101274 is part of the NGC 3766 cluster, which is sometimes referred to as the Pearl Cluster, an open cluster known for its richness in bright stars and its relatively young age.</p>



<p>HD 101274 is categorized as a blue giant star, characterized by its high temperature and luminosity. Blue giants are massive stars that have left the main sequence phase of stellar evolution and are burning helium or heavier elements in their cores. These stars are known for their short lifespans relative to smaller stars due to their rapid consumption of nuclear fuel.</p>



<p><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> like HD 101274 are important for astronomers because they help in studying the properties of stellar populations in clusters and the dynamics of stellar evolution in different environments. The spectral and photometric observations of such stars can provide valuable insights into the characteristics of their atmospheres, internal structures, and the processes occurring within and around them.</p>



<h2 class="wp-block-heading" id="h-bright-central-region-of-ngc-3783">Bright central region of NGC 3783</h2>



<p>One of the most interesting aspects of NGC 3783 is that it harbors an active galactic nucleus, meaning its central region is exceptionally luminous, likely due to the presence of a supermassive black hole. This black hole is actively accreting material, which emits a substantial amount of radiation as it spirals inward and heats up.</p>



<p>This galaxy is particularly known for its bright central region and has been studied extensively in the ultraviolet and X-ray light spectra to understand better the properties of the accretion disk around the black hole and the complex dynamics of the material surrounding it. These studies are crucial for understanding the physics of active galactic nuclei and the role they play in <a href="https://www.earth.com/news/galaxies-like-our-own-milky-way-are-not-unique/" target="_blank" rel="noreferrer noopener">galaxy evolution</a>.</p>



<p>According to ESA, NGC 3783 is a Type I Seyfert galaxy. “In this image it is recorded by Hubble in incredible detail, from its glowing central bar to its narrow, winding arms and the dust threaded through them, thanks to five separate images taken in different wavelengths of light," noted ESA.</p>



<p>“In fact, the galactic center is bright enough to Hubble that it exhibits diffraction spikes, normally only seen on stars such as HD 101274.”</p>



<h2 class="wp-block-heading" id="h-more-about-the-ngc-3783-galaxy-group">More about the NGC 3783 galaxy group</h2>



<p>The NGC 3783 group is part of the larger Hydra-Centaurus Supercluster, which itself is a massive collection of galaxies and galaxy clusters located primarily in the constellations of Hydra and Centaurus.</p>



<p>The NGC 3783 group consists of several galaxies that are gravitationally bound and interact with each other. These interactions can influence the galaxies' evolution through mechanisms like tidal forces and merger events, which can trigger star formation, fuel central black holes, and reshape the galaxies' structures.</p>



<p>Studying groups like the NGC 3783 group helps astronomers understand how <a href="https://www.earth.com/news/ceers-2112-ancient-galaxy-looks-strikingly-similar-to-ours/" target="_blank" rel="noreferrer noopener">galaxies</a> evolve together in a common gravitational environment, offering insights into the dynamics and evolution of structures on cosmic scales. This is especially relevant in understanding how galaxies influence each other through gravitational interactions and the environmental effects on galaxy evolution.</p>



<p>Image Credit: ESA/Hubble &amp; NASA</p>



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The luminous galaxy NGC 3783 and a blue giant star

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

<p>Researchers at the <a href="https://illinois.edu/">University of Illinois Urbana-Champaign</a> have recently reported that both public parks and private backyards play a vital role in supporting bird diversity in urban environments. </p>



<p>"Greenspaces are increasingly valued for supporting biodiversity in urbanized landscapes. Previous research efforts have emphasized the importance of public land such as parks and nature preserves for biodiversity, yet private yards in residential neighborhoods also have great potential for species conservation," wrote the researchers. </p>



<p>By studying two closely situated cities in Illinois with contrasting development histories and green space management, the experts discovered that these spaces are crucial for different bird species during varying seasons.</p>



<h2 class="wp-block-heading" id="h-urban-bird-populations">Urban bird populations</h2>



<p>The researchers monitored <a href="https://www.earth.com/news/bird-populations-are-declining-worldwide/" target="_blank" rel="noreferrer noopener">bird populations</a> across 39 public parks and 41 private yards in Urbana and Champaign - cities with distinct urban characteristics and historical development. </p>



<p>Urbana, with a history dating back to 1822, boasts extensive green spaces nurtured within an ancient hardwood forest. By contrast, Champaign was developed in the mid-1800s along a railway - with a focus on human recreation in its smaller parks.</p>



<h2 class="wp-block-heading" id="h-seasonal-variations-in-urban-bird-diversity">Seasonal variations in urban bird diversity </h2>



<p>The analysis revealed significant seasonal shifts in bird <a href="https://www.earth.com/news/u-s-bird-diversity-puzzling-geographical-differences-identified/" target="_blank" rel="noreferrer noopener">diversity</a> between the two cities. During summer, Urbana's richer vegetation and cooler green spaces attracted a broader variety of birds, including species like the belted kingfisher and scarlet tanager. </p>



<p>Conversely, in winter, Urbana's parks and yards continued to support diverse communities, including the winter wren and yellow-bellied sapsucker.</p>



<h2 class="wp-block-heading" id="h-impact-of-urban-management-on-bird-diversity">Impact of urban management on bird diversity</h2>



<p>Pollock pointed out the significant effects of active management in urban green spaces. "In places where there’s been active management to try to increase plant diversity and get some native plant cover back, it has had a big impact on the <a href="https://www.earth.com/news/as-urban-heat-continues-to-rise-birds-are-moving-away/" target="_blank" rel="noreferrer noopener">bird</a> communities," he explained. </p>



<p>Urbana's parks, with their focus on conservation and habitat restoration, were especially beneficial for rare and specialist bird species.</p>



<h2 class="wp-block-heading" id="h-practical-actions-for-residents">Practical actions for residents</h2>



<p>The study also suggests practical ways for residents to enhance bird diversity in their own backyards. Carena Van Riper, a collaborator on the project, encouraged simple yet effective actions. </p>



<p>"Perhaps this will allow people to see that there are small but important behaviors that will influence birds and increase bird diversity," noted Van Riper. </p>



<p>Among the recommendations were installing bird feeders (especially during winter), planting native vegetation, and setting up bird baths.</p>



<h2 class="wp-block-heading" id="h-urban-greenery-a-blueprint-for-biodiversity">Urban greenery: A blueprint for biodiversity </h2>



<p>This comprehensive study underscores the interconnectedness of urban management and biodiversity. It offers a fresh perspective on how both public and private green spaces play integral roles in supporting urban wildlife. </p>



<p>As cities continue to grow, understanding and implementing strategies that facilitate coexistence with nature becomes even more crucial. </p>



<p>The insights from Urbana and Champaign can serve as a guide for other <a href="https://www.earth.com/news/green-spaces-shape-bird-characteristics-in-urban-areas/" target="_blank" rel="noreferrer noopener">urban areas</a> aiming to enhance biodiversity and sustainability within their confines.</p>



<h2 class="wp-block-heading">What influences urban bird diversity?</h2>



<p>Urban bird diversity is influenced by a variety of factors, each playing a role in how well birds can adapt and thrive in city environments. Key factors include:</p>



<h3 class="wp-block-heading">Green spaces</h3>



<p>The presence and quality of green spaces such as parks, gardens, and green roofs are crucial. These areas provide essential resources like food, nesting sites, and safe havens from urban threats.</p>



<h3 class="wp-block-heading">Water bodies</h3>



<p>Rivers, lakes, and ponds in urban settings attract waterfowl and other species that rely on aquatic habitats for feeding and breeding.</p>



<h3 class="wp-block-heading">Food availability</h3>



<p>The accessibility of natural food sources, supplemented by bird feeders, significantly impacts which species are able to sustain populations in urban areas.</p>



<h3 class="wp-block-heading">Building designs</h3>



<p>The architecture of a city influences bird diversity. Features like reflective glass can cause bird collisions, whereas features like ledges and nooks might offer nesting spots.</p>



<h3 class="wp-block-heading">Pollution</h3>



<p>Air and noise pollution can deter birds from settling in urban areas. Pollution can also affect the health of the habitats birds rely on.</p>



<h3 class="wp-block-heading">Human interaction</h3>



<p>The level and nature of human activity and disturbance - ranging from benign presence to active conservation efforts - play a big role. Quieter, less disturbed areas tend to support more diverse bird populations.</p>



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



<p>Urban microclimates, influenced by the heat island effect where cities are warmer than surrounding areas, can affect which species are likely to thrive or decline in urban settings.</p>



<p>The study is published in the journal <em><a href="https://www.sciencedirect.com/science/article/pii/S0169204624000598?via%3Dihub" target="_blank" rel="noreferrer noopener">Landscape and Urban Planning</a></em>.</p>



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



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How urban spaces support bird diversity

Researchers at the University of Illinois Urbana-Champaign have recently reported...

<p>Water evaporation is a fundamental process that occurs all around us, from the surfaces of oceans and lakes to the <a href="https://www.earth.com/news/scientists-are-unraveling-the-mysteries-of-fog-formation/" target="_blank" rel="noreferrer noopener">burning off of fog</a> in the morning light from the sun. </p>



<p>For centuries, humans have observed and utilized this phenomenon, assuming that heat was the sole cause of <a href="https://www.earth.com/news/new-technology-can-purify-water-as-it-is-collected-from-fog/" target="_blank" rel="noreferrer noopener">evaporation</a>. However, a truly groundbreaking discovery by a team of scientists has revealed that there is more to evaporation than meets the eye.</p>



<h2 class="wp-block-heading" id="h-photomolecular-effect-how-light-breaks-water-molecules">Photomolecular effect: How light breaks water molecules</h2>



<p>In a series of meticulous experiments, a team led by Gang Chen, the Carl Richard Soderberg Professor of Power Engineering at <a href="https://www.mit.edu" target="_blank" rel="noreferrer noopener">MIT</a>, along with postdocs Guangxin Lv and Yaodong Tu, and graduate student James Zhang, has demonstrated that light can also cause water to <a href="https://www.earth.com/news/transforming-drinking-bird-toy-into-power-generator-electricity/" target="_blank" rel="noreferrer noopener">evaporate</a>, even in the absence of heat. </p>



<p>Their findings, published in the journal <em>PNAS</em>, suggest that this effect, which they have named the photomolecular effect, could have far-reaching implications in various fields, from climate science to industrial applications.</p>



<p>The researchers have named this phenomenon the photomolecular effect, drawing an analogy with the <a href="https://www.earth.com/news/quantum-ping-pong-game-played-by-two-atoms-controlling-photons/" target="_blank" rel="noreferrer noopener">photoelectric effect</a> discovered by Heinrich Hertz in 1887 and later explained by Albert Einstein in 1905. </p>



<p>Just as the photoelectric effect demonstrates that photons of light can liberate electrons from atoms in a material, the photomolecular effect shows that photons can also liberate entire molecules from a liquid surface.</p>



<h2 class="wp-block-heading">Solving an 80-year-old mystery in climate science</h2>



<p>This discovery may hold the key to solving an 80-year-old mystery in <a href="https://www.earth.com/news/global-temperature-increase-2023-blew-past-all-climate-models/" target="_blank" rel="noreferrer noopener">climate science</a>, which has puzzled scientists for decades. Measurements of cloud absorption of sunlight have often shown discrepancies, with clouds absorbing more sunlight than conventional physics dictates possible.</p>



<p>"Those experiments are based on satellite data and flight data. They fly an airplane on top of and below the clouds, and there are also data based on the ocean temperature and radiation balance. And they all conclude that there is more <a href="https://www.earth.com/news/sci-fi-inspired-scenarios-illustrate-our-impact-on-earths-water-cycle/" target="_blank" rel="noreferrer noopener">absorption by clouds</a> than theory could calculate," Gang Chen explains. </p>



<p>"However, due to the complexity of clouds and the difficulties of making such measurements, researchers have been debating whether such discrepancies are real or not. And what we discovered suggests that hey, there's another mechanism for <a href="https://www.earth.com/news/microplastics-found-in-clouds-may-be-affecting-the-weather/" target="_blank" rel="noreferrer noopener">cloud absorption</a>, which was not accounted for, and this mechanism might explain the discrepancies," Chen continued.</p>



<h2 class="wp-block-heading" id="h-rigorous-testing-and-evidence">Rigorous testing and evidence</h2>



<p>Due to the unexpected <a href="https://www.earth.com/news/light-can-drive-water-evaporation-without-heat/" target="_blank" rel="noreferrer noopener">nature of the effect</a>, the research team conducted 14 different kinds of tests and measurements to establish that water was indeed evaporating due to light alone, not heat. </p>



<p>One key indicator, consistently observed in four different experiments under varying conditions, was the cooling and leveling off of air temperature above the water's surface as evaporation began under visible light. This finding suggests that thermal energy was not the driving force behind the effect.</p>



<p>Lv, one of the postdocs involved in the study, highlights that among the many lines of evidence, "the flat region in the air-side temperature distribution above hot water will be the easiest for people to reproduce." This temperature profile "is a signature" that demonstrates the effect clearly, he says.</p>



<p>Zhang, the graduate student on the team, adds: "It is quite hard to explain how this kind of flat temperature profile comes about without invoking some other mechanism" beyond the accepted theories of thermal evaporation. </p>



<p>According to Zhang, "It ties together what a whole lot of people are reporting in their <a href="https://www.earth.com/news/cheap-and-drinkable-water-from-desalination-is-finally-a-reality/" target="_blank" rel="noreferrer noopener">solar desalination</a> devices," which again show evaporation rates that cannot be explained by the thermal input.</p>



<h2 class="wp-block-heading" id="h-substantial-impact-four-times-the-thermal-limit">Substantial impact: Four times the thermal limit</h2>



<p>The photomolecular effect can have a substantial impact on evaporation rates. Under the optimum conditions of color, angle, and polarization, Lv says, "the evaporation rate is four times the thermal limit."</p>



<p>"I think this has a lot of applications," Chen says. "We're exploring all these different directions. And of course, it also affects the basic science, like the effects of clouds on climate, because clouds are the most uncertain aspect of climate models."</p>



<p>Since the publication of the <a href="https://news.mit.edu/2023/surprising-finding-light-makes-water-evaporate-without-heat-1031" target="_blank" rel="noreferrer noopener">first paper</a> on this topic, the team has been approached by companies hoping to harness the effect for various applications, including evaporating syrup and drying paper in a paper mill. </p>



<p>Chen believes that the likeliest first applications will come in the areas of <a href="https://www.earth.com/news/converting-seawater-into-drinkable-water-is-now-more-sustainable/" target="_blank" rel="noreferrer noopener">solar desalinization</a> systems or other industrial drying processes. "Drying consumes 20 percent of all industrial energy usage," he points out.</p>



<h2 class="wp-block-heading" id="h-new-frontier-in-light-water-interactions-and-evaporation">New frontier in light-water interactions and evaporation</h2>



<p>As the photomolecular effect is a new and unexpected phenomenon, Chen emphasizes that "this phenomenon should be very general, and our experiment is really just the beginning." </p>



<p>The experiments needed to demonstrate and quantify the effect are very time-consuming, and there are many variables to explore, from understanding water itself to extending the research to other materials, liquids, and even solids.</p>



<p>"The finding of evaporation caused by light instead of heat provides new disruptive knowledge of light-water interaction. It could help us gain new understanding of how sunlight interacts with cloud, fog, oceans, and other natural water bodies to affect weather and climate," enthused Xiulin Ruan, professor of mechanical engineering at <a href="https://www.purdue.edu" target="_blank" rel="noreferrer noopener">Purdue University</a>, who was not involved in the study.</p>



<p>"It has significant potential practical applications such as high-performance water desalination driven by solar energy. This research is among the rare group of truly revolutionary discoveries which are not widely accepted by the community right away but take time, sometimes a long time, to be confirmed," Ruan concluded.</p>



<h2 class="wp-block-heading" id="h-how-the-photomolecular-effect-could-transform-our-world">How the photomolecular effect could transform our world</h2>



<p>In summary, the photomolecular effect represents a paradigm shift in our understanding of water evaporation and light-water interaction. </p>



<p>This truly groundbreaking discovery by Gang Chen and his team at MIT challenges long-held assumptions and opens up a wealth of possibilities for future research and applications. </p>



<p>As scientists continue to explore the variables and implications of this phenomenon, we can anticipate a new era of innovation in fields ranging from climate science to industrial processes. </p>



<p>The photomolecular effect reminds us that even the most fundamental and seemingly well-understood processes in nature can still hold surprises, and that the pursuit of scientific knowledge is an ongoing journey of discovery and wonder.</p>



<p>The full study was published in the journal <em><a href="https://www.pnas.org/doi/10.1073/pnas.2320844121" target="_blank" rel="noreferrer noopener">Proceedings of the National Academy of Sciences</a></em>.</p>



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Paradigm shift: Light causes water evaporation without the need for heat

Water evaporation is a fundamental process that occurs all around...

3d,Illustration,Of,A,Robotic,Or,Machine,Hand,With,A

<p>By focusing on <a href="https://www.earth.com/news/plants-change-their-roots-to-survive-harsh-conditions/" target="_blank" rel="noreferrer noopener">root systems</a>, researchers aim to create new plants, using an artificial intelligence (AI) tool called SLEAP, that can store more carbon for extended periods.</p>



<p>For this intriguing new study, scientists are leveraging AI to optimize plants' natural ability to <a href="https://www.earth.com/news/good-news-plants-are-absorbing-more-human-produced-co2-than-expected/" target="_blank" rel="noreferrer noopener">draw carbon dioxide</a> out of the atmosphere, a crucial step in combating climate change and limiting global temperature rise. </p>



<h2 class="wp-block-heading" id="h-sleap-game-changing-ai-tool-that-creates-plants">SLEAP: Game-changing AI tool that creates plants</h2>



<p>Talmo Pereira and Professor <a href="https://www.salk.edu/scientist/wolfgang-busch/" target="_blank" rel="noreferrer noopener">Wolfgang Busch</a> from Salk’s <a href="https://www.salk.edu/harnessing-plants-initiative/" target="_blank" rel="noreferrer noopener">Harnessing Plants Initiative</a> have joined forces to apply SLEAP, a sophisticated AI software initially designed for tracking animal movement, to the study of plants. </p>



<p>Their research introduces a <a href="https://www.nature.com/articles/s41592-022-01426-1" target="_blank" rel="noreferrer noopener">new protocol</a> for using SLEAP to analyze plant root phenotypes, such as depth, width, and mass.</p>



<p>"This collaboration is truly a testament to what makes Salk science so special and impactful," says Pereira. "We're not just 'borrowing' from different disciplines -- we're really putting them on equal footing in order to create something greater than the sum of its parts."</p>



<h2 class="wp-block-heading" id="h-streamlining-plant-analysis-with-ai">Streamlining plant analysis with AI</h2>



<p>Prior to SLEAP, analyzing plant and animal characteristics was a labor-intensive process that slowed scientific progress. </p>



<p>Researchers had to manually flag parts of images frame-by-frame, part-by-part, and pixel-by-pixel before older AI models could process the data.</p>



<p>SLEAP's unique combination of computer vision and <a href="https://www.earth.com/news/machine-learning-could-help-save-mangrove-forests/" target="_blank" rel="noreferrer noopener">deep learning</a> allows researchers to skip this intermediary step, jumping straight from image input to defined plant features. </p>



<p>This approach significantly reduces analysis time and human error while emphasizing accessibility and ease of use.</p>



<h2 class="wp-block-heading" id="h-sleap-roots-digging-deep-into-plant-biology">sleap-roots: Digging deep into plant biology</h2>



<p>The Salk team developed sleap-roots, a downloadable toolkit for SLEAP that enables the software to process biological traits of root systems, such as depth, mass, and angle of growth. </p>



<p>The toolkit, available as open-source software, was tested on various plants, including soybeans, rice, canola, and <em><a href="https://www.earth.com/news/scientists-capture-plant-communication-on-video/" target="_blank" rel="noreferrer noopener">Arabidopsis thaliana</a></em>.</p>



<p>"We created a robust protocol validated in multiple plant types that cuts down on analysis time and human error, while emphasizing accessibility and ease-of-use -- and it required no changes to the actual SLEAP software," says Elizabeth Berrigan, a bioinformatics analyst in Busch's lab.</p>



<h2 class="wp-block-heading" id="h-deciphering-the-secrets-of-climate-saving-plants">Deciphering the secrets of climate-saving plants</h2>



<p>By connecting phenotypic data, such as a plant's <a href="https://www.earth.com/news/measuring-plant-root-health-scanning-leaves-xray-device/" target="_blank" rel="noreferrer noopener">deep root system</a>, with genotype data obtained through genome sequencing efforts, researchers can identify the genes responsible for creating desirable traits. </p>



<p>This step is crucial in Salk's mission to create plants with AI that hold on to more carbon for longer periods, as these plants will require root systems designed to be deeper and more robust.</p>



<p>"We have already been able to create the most extensive catalogue of plant root system phenotypes to date, which is really accelerating our research to create carbon-capturing plants that fight climate change," says Busch, the Hess Chair in <a href="https://pbio.salk.edu/" target="_blank" rel="noreferrer noopener">Plant Science at Salk</a>. </p>



<p>"SLEAP has been so easy to apply and use, thanks to Talmo's professional software design, and it's going to be an indispensable tool in my lab moving forward," Busch concluded.</p>



<h2 class="wp-block-heading" id="h-understanding-the-hidden-world-of-plant-root-systems">Understanding the hidden world of plant root systems</h2>



<p>To further clarify, plant root systems are intricate networks of roots that play a crucial role in anchoring plants to the soil, absorbing water and nutrients, and storing essential compounds. </p>



<p>There are <a href="https://www.earth.com/news/maize-plant-genetics-shape-root-health-and-growth/" target="_blank" rel="noreferrer noopener">two main types of root systems</a> exist in plants: taproot systems and fibrous root systems. </p>



<ul>
<li>Taproot systems feature a single, dominant root that grows vertically downward, with smaller lateral roots branching off from it. </li>
</ul>



<ul>
<li>Fibrous root systems, on the other hand, consist of numerous small roots that grow outward from the base of the plant, forming a dense network.</li>
</ul>



<h3 class="wp-block-heading">Functions of root systems</h3>



<p><a href="https://www.earth.com/news/plant-roots-follow-gravity/" target="_blank" rel="noreferrer noopener">Root systems</a> perform several critical functions for plants:</p>



<ul>
<li><strong>Anchoring:</strong> Roots secure plants to the soil, providing stability and preventing them from toppling over.</li>
</ul>



<ul>
<li><strong>Absorption:</strong> Fine root hairs absorb water and dissolved nutrients from the soil, which are then transported to the rest of the plant.</li>
</ul>



<ul>
<li><strong>Storage:</strong> Some plants, such as carrots and beets, use their roots to store carbohydrates and other essential compounds.</li>
</ul>



<h3 class="wp-block-heading">Factors influencing root growth</h3>



<p>Several factors influence the growth and development of plant root systems:</p>



<ul>
<li><strong>Soil type:</strong> Different soil types, such as sandy, loamy, or clay soils, affect root growth and distribution.</li>
</ul>



<ul>
<li><strong>Water availability:</strong> Plants adapt their root systems in response to water availability, with some species growing deeper roots to access water in times of drought.</li>
</ul>



<ul>
<li><strong>Nutrient availability:</strong> The presence or absence of essential nutrients in the soil can impact root growth and architecture.</li>
</ul>



<p>Healthy root systems are essential for overall plant health and productivity. <a href="https://www.earth.com/news/deep-rooted-crops-can-significantly-improve-soil-carbon-storage/" target="_blank" rel="noreferrer noopener">Well-developed roots</a> enable plants to efficiently absorb water and nutrients, leading to stronger growth and increased resilience to stresses such as drought or disease. </p>



<h2 class="wp-block-heading" id="h-ai-and-the-future-of-climate-saving-plants">AI and the future of climate-saving plants</h2>



<p>The accessibility and reproducibility of SLEAP and sleap-roots have the potential to revolutionize plant research worldwide. The Salk team has already begun discussions with NASA scientists hoping to utilize the tool to guide <a href="https://www.earth.com/news/reducing-air-pollution-could-greatly-boost-carbon-sequestration-by-plants/" target="_blank" rel="noreferrer noopener">carbon-sequestering plants</a> on Earth and to study plants in space.</p>



<p>In summary, the Salk Institute's pioneering research in plant-based carbon capture, powered by the innovative SLEAP software and sleap-roots toolkit, paves the way for a greener future. </p>



<p>As scientists continue to refine and expand these tools, they accelerate the development of climate-saving plants with optimized root systems capable of storing more carbon for longer periods. </p>



<p>The accessibility and reproducibility of SLEAP and sleap-roots invite researchers worldwide to join the fight against climate change, fostering global collaboration and innovation. </p>



<p>With the Harnessing Plants Initiative at the forefront, Salk scientists are rooting for change, digging deep into plant biology, and branching out to make a lasting impact on our planet's future.</p>



<p>The full study was published in the journal <em><a href="https://spj.science.org/doi/10.34133/plantphenomics.0175" target="_blank" rel="noreferrer noopener">Plant Phenomics</a></em>.</p>



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AI is creating new plants that can help fight climate change

By focusing on root systems, researchers aim to create new...

<div class="vdb_player vdb_591c9e3c9efa894c3c6e150b58d96b98cd4fed198a0d2a49">
<script src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" type="text/javascript"></script></div>
<p>U.S. EPA Regional Administrator Jared Blumenfeld announced on Earth Day nearly $5 million in EPA grants to state and local agencies to restore water quality and wetlands throughout the San Francisco Bay watershed at a ceremony held at Breuner Marsh (Richmond, Calif.)</p>
<p>The Breuner Marsh restoration will create and restore more than 160 acres of wetland and upland habitat at Breuner Marsh along the Point Pinole Regional Shoreline in Richmond. The project will create a self-sustaining <a href="https://www.earth.com/video/coastal-wetlands-are-threatened-by-salt-water-intrusion/">wetland</a> complex that will filter polluted run-off, support native plant and animal species, and protect against projected sea level rise in the next century.</p>


U.S. EPA Celebrates Earth Day at Breuner Marsh in Richmond