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    • By European Space Agency
      Video: 00:09:01 Proba-3 is such an ambitious mission that it needs more than one single spacecraft to succeed. In order for Proba-3’s Coronagraph spacecraft to observe the Sun’s faint surrounding atmosphere, its disk-bearing Occulter spacecraft must block out the fiery solar disk. This means Proba-3’s Occulter ends up facing the Sun continuously, making it a valuable platform for science in its own right.
      Proba-3 is scheduled for launch on a PSLV-XL rocket from Satish Dhawan Space Centre in Sriharikota, India, on Wednesday, 4 December, at 11:38 CET (10:38 GMT, 16:08 local time).
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    • By NASA
      8 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      Virtual meetings feeling a little stale? NASA has just unveiled a suite of new Artemis backgrounds to elevate your digital workspace.

      From the majesty of the Artemis I launch lighting up the night sky to the iconic image of the Orion spacecraft with the Moon and Earth in view, these virtual backgrounds allow viewers to relive the awe-inspiring moments of Artemis I and glimpse the bright future that lies ahead as the Artemis campaign enables humans to live and work at the Moon’s South Pole region.

      Scroll through to download your next virtual background for work, school, or just for fun, and learn about all things Artemis as the agency and its partners cross off milestones leading up to Artemis II and missions beyond.

      Artemis I Launch
      Credit: NASA/Bill Ingalls NASA’s SLS (Space Launch System) rocket carrying the Orion spacecraft launches on the Artemis I flight test on Nov. 16, 2022, from Launch Complex 39B at NASA’s Kennedy Space Center in Florida. NASA’s Artemis I mission was the first integrated flight test of the agency’s deep space exploration systems: the Orion spacecraft, SLS rocket, and ground systems. SLS and Orion launched at 1:47 a.m. EST from Launch Pad 39B at Kennedy.
      Artemis II Crew
      Credit: NASA Meet the astronauts who will fly around the Moon during the Artemis II mission. From left are Commander Reid Wiseman, Pilot Victor Glover, and Mission Specialist Christina Koch from NASA, and Mission Specialist Jeremy Hansen from the Canadian Space Agency.
      Astronaut Regolith
      Credit: NASA An artist’s concept of two suited Artemis crew members working on the lunar surface. The samples collected during future Artemis missions will continue to advance our knowledge of the solar system and help us understand the history and formation of Earth and the Moon, uncovering some of the mysteries that have long eluded scientists.
      Exploration Ground Systems
      Credit: NASA NASA’s mobile launcher, atop Crawler Transporter-2, is at the entrance to High Bay 3 at the Vehicle Assembly Building (VAB) on Sept. 8, 2018, at NASA’s Kennedy Space Center in Florida. This is the first time that the modified mobile launcher made the trip to the pad and the VAB. The mobile launcher is the structure that is used to assemble, process, and launch the SLS rocket.
      Credit: NASA/Joel Kowsky NASA’s SLS rocket with the Orion spacecraft aboard is seen atop a mobile launcher at Launch Pad 39B on Nov. 4, 2022, as Crawler Transporter-2 departs the pad following rollout at NASA’s Kennedy Space Center in Florida.
      Credit: NASA After Orion splashed down in the Pacific Ocean, west of Baja California, the spacecraft was recovered by personnel on the USS Portland from the U.S. Department of Defense, including Navy amphibious specialists, Space Force weather specialists, and Air Force specialists, as well as engineers and technicians from NASA’s Kennedy Space Center in Florida, the agency’s Johnson Space Center in Houston, and Lockheed Martin Space Operations. Personnel from NASA’s Exploration Ground Systems led the recovery efforts.
      Credit: NASA/Keegan Barber NASA’s SLS (Space Launch System) rocket with the Orion spacecraft aboard is seen atop a mobile launcher as it rolls out to Launch Complex 39B for the first time on March 17, 2022, at NASA’s Kennedy Space Center in Florida. At left is the Vehicle Assembly Building.
      First Woman
      Credit: NASA “First Woman” graphic novel virtual background featuring an illustration of the inside of a lunar space station outfitted with research racks and computer displays. To learn more about the graphic novel and interactive experiences, visit: nasa.gov/calliefirst/
      Credit: NASA “First Woman” graphic novel virtual background featuring the illustration of the inside of a lunar space station outfitted with research racks and computer displays, along with zero-g indicator suited rubber duckies floating throughout. To learn more about the graphic novel and interactive experiences, visit: nasa.gov/calliefirst/
      Credit: NASA This “First Woman” graphic novel virtual background features an illustrated scene from a lunar mission. At a lunar camp, one suited astronaut flashes the peace sign while RT, the robot sidekick, waves in the foreground. To learn more about the graphic novel and interactive experiences, visit: nasa.gov/calliefirst/
      Gateway
      Credit: NASA The Gateway space station hosts the Orion spacecraft and SpaceX’s deep space logistics spacecraft in a polar orbit around the Moon, supporting scientific discovery on the lunar surface during the Artemis IV mission.
      Credit: Northrop Grumman and Thales Alenia Space The Gateway space station’s HALO (Habitation and Logistics Outpost) module, one of two of Gateway’s habitation elements where astronauts will live, conduct science, and prepare for lunar surface missions, successfully completed welding in Turin, Italy. Following a series of tests to ensure its safety, the future home for astronauts will travel to Gilbert, Arizona, for final outfitting ahead of launch to lunar orbit. Gateway will be humanity’s first space station in lunar orbit and is an essential component of the Artemis campaign to return humans to the Moon for scientific discovery and chart a path for human missions to Mars.
      Lunar Surface
      Credit: SpaceX Artist’s concept of SpaceX Starship Human Landing System, or HLS, which is slated to transport astronauts to and from the lunar surface during Artemis III and IV.
      Credit: Blue Origin Artist’s concept of Blue Origin’s Blue Moon MK-2 human lunar lander, which is slated to land astronauts on the Moon during Artemis V.
      Credit: NASA The “Moon buggy” for NASA’s Artemis missions, the Lunar Terrain Vehicle (LTV), is seen here enabling a pair of astronauts to explore more of the Moon’s surface and conduct science research farther away from the landing site. NASA has selected Intuitive Machines, Lunar Outpost, and Venturi Astrolab to advance capabilities for an LTV.
      Credit: JAXA/Toyota An artist’s concept of the pressurized rover — which is being designed, developed, and operated by JAXA (Japan Aerospace Exploration Agency) — is seen driving across the lunar terrain. The pressurized rover will serve as a mobile habitat and laboratory for the astronauts to live and work for extended periods of time on the Moon.
      Logo
      Credit: NASA The NASA “meatball” logo. The round red, white, and blue insignia was designed by employee James Modarelli in 1959, NASA’s second year. The design incorporates references to different aspects of NASA’s missions.
      Credit: NASA The NASA meatball logo (left) and Artemis logo side by side.
      Moon Phases
      Credit: NASA The different phases of the Moon, shown in variations of shadowing, extend across this virtual background.
      Orion
      Credit: NASA On flight day 5 during Artemis I, the Orion spacecraft took a selfie while approaching the Moon ahead of the outbound powered flyby — a burn of Orion’s main engine that placed the spacecraft into lunar orbit. During this maneuver, Orion came within 81 miles of the lunar surface.
      Credit: NASA On flight day 13 during Artemis I, Orion reached its maximum distance from Earth at 268,563 miles away from our home planet, traveling farther than any other spacecraft built for humans.
      Credit: NASA This first high-resolution image, taken on the first day of the Artemis I mission, was captured by a camera on the tip of one of Orion’s solar arrays. The spacecraft was 57,000 miles from home and distancing itself from planet Earth as it approached the Moon and distant retrograde orbit.
      Silhouettes
      Credit: NASA In this virtual background, various scenes from Earth, Moon, and Mars are depicted within the silhouette outlines of three suited astronauts, artistically representing the interconnected nature of human space exploration from low Earth orbit to the Moon and, one day, human missions to Mars.
      SLS (Space Launch System)
      Credit: Joel Kowsky In this sunrise photo at NASA’s Kennedy Space Center in Florida, NASA’s SLS rocket with the Orion spacecraft aboard is seen atop the mobile launcher at Launch Pad 39B as preparations continued for the Artemis I launch.
      Credit: NASA/Joel Kowsky In this close-up image, NASA’s SLS rocket with the Orion spacecraft aboard is seen atop the mobile launcher at Launch Pad 39B on Nov. 12, 2022, at NASA’s Kennedy Space Center in Florida.
      Credit: NASA/Joel Kowsky NASA’s SLS rocket with the Orion spacecraft aboard is seen at sunrise atop the mobile launcher at Launch Pad 39B on Nov. 7, 2022, at NASA’s Kennedy Space Center in Florida.
      Earth, Moon, and Mars
      Credit: NASA From left, an artist’s concept of the Moon, Earth, and Mars sharing space. NASA’s long-term goal is to send humans to Mars, and we will use what we learn at the Moon to help us get there. This is the agency’s Moon to Mars exploration approach.  
      Credit: NASA In this artist’s concept, the upper portion of a blended sphere represents the Earth, Moon, and Mars.
      Credit: NASA An artist’s concept showing, from left, the Earth, Moon, and Mars in sequence. Mars remains our horizon goal for human exploration because it is a rich destination for scientific discovery and a driver of technologies that will enable humans to travel and explore far from Earth. 
      About the Author
      Catherine E. Williams

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      Last Updated Dec 02, 2024 Related Terms
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    • By European Space Agency
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    • By NASA
      As any urban dweller who has lived through a heat wave knows, a shady tree can make all the difference. But what happens when there’s no shade available?
      A recent study in Nature Communications used NASA satellite data to identify a major gap in global resilience to climate change: cities in the Global South have far less green space — and therefore less cooling capacity — than cities in the Global North. The terms Global North and Global South were used in the study to distinguish developed countries (mostly in the Northern Hemisphere) from developing nations (mostly in the Southern Hemisphere).
      Cities tend to be hotter than nearby rural areas because of the urban heat island effect. Heat-trapping dark surfaces such as sidewalks, buildings, and roads absorb heat from the Sun’s rays, which raises the temperature of the city. Extreme heat poses serious health threats for urban residents, including dehydration, heat stroke, and even death. Though not a cure-all, greenery provides shade and releases moisture into the air, cooling the surroundings.
      “Cities can strategically prioritize developing new green spaces in areas that have less green space,” said Christian Braneon, a climate scientist at NASA’s Goddard Institute for Space Studies in New York who was not affiliated with this study. “Satellite data can be really helpful for this.”
      The Operational Land Imager (OLI) on the NASA and U.S. Geological Survey’s Landsat 8 satellite captured this natural color image of Sanaa, Yemen, on June 8, 2024. Sanaa, which has a hot, dry climate and little green space, had the second-lowest cooling capacity of 500 cities studied in a paper recently published in the journal Nature Communications. Wanmei Liang, NASA Earth Observatory An international team of researchers led by Yuxiang Li, a doctoral student at Nanjing University, analyzed the 500 largest cities in the world to compare their cooling capacities. They used data from the Landsat 8 satellite, jointly managed by NASA and the U.S. Geological Survey, to determine how effective green space was at cooling each city.
      First, they calculated the average land surface temperature for the hottest month of 2018 for each city, as well as the average of the hottest months from 2017 to 2019. Next, the researchers used a metric called the Normalized Difference Vegetation Index (NDVI) to map how much green space each city had. The NDVI relies on the fact that healthy vegetation absorbs red light and reflects infrared light: the ratio of these wavelengths can show the density of healthy vegetation in a given satellite image.
      Researchers found that cities in the Global South have just 70% of the greenery-related cooling capacity of cities in the Global North. The green spaces in an average Global South city cool the temperature by about 4.5 F (2.5 C). In an average Global North city, that cooling capacity is 6.5 F (3.6 C). This compounds an existing problem: cities in the South tend to be at lower latitudes (that is, nearer to the Equator), which are predicted to see more heat extremes in the coming years.
      “It’s already clear that Global South countries will be impacted by heat waves, rising temperatures, and climatic extremes more than their Global North counterparts,” said Chi Xu, a professor of ecology at Nanjing University and a co-author of the study. The Global South has less capacity to adapt to heat because air conditioning is less common and power outages are more frequent.
      Why do cities in the Global South struggle to stay cool? Cities in the Global South tend to have less green space than cities in the Global North. This mirrors studies of the disparities within cities, sometimes referred to as the “luxury effect”: wealthier neighborhoods tend to have more green space than poorer neighborhoods. “Wealthier cities also have more urban green spaces than the poorest cities,” Chi said.
      It’s unlikely that urban planners can close the gap between the study’s worst-performing city (Mogadishu, Somalia) and the best-performing one (Charlotte, North Carolina).
      Mogadishu is a dense city with a dry climate that limits vegetation growth. Still, there’s a lot that each city can learn from its neighbors. Within a given region, the researchers identified the city with the greatest cooling capacity and used that as a goal. They calculated the difference between the best-performing city in the region and every city nearby to get the potential additional cooling capacity. They found that cities’ average cooling capacity could be increased substantially — to as much as 18 F (10 C) — by systematically increasing green space quantity and quality.
      “How you utilize green space is really going to vary depending on the climate and the urban environment you’re focused on,” said Braneon, whose research at NASA focuses on climate change and urban planning.
      Greener cities in the U.S. and Canada have lower population densities. However, fewer people per square mile isn’t necessarily good for the environment: residents in low-density cities rely more on cars, and their houses tend to be bigger and less efficient. Braneon noted that there’s a suite of solutions beyond just planting trees or designating parks: Cities can increase cooling capacity by creating water bodies, seeding green roofs, and painting roofs or pavement lighter colors to reflect more light.
      With a global study like this, urban planners can compare strategies for cities within the same region or with similar densities. “For newly urbanized areas that aren’t completely built out, there’s a lot of room to still change the design,” Braneon said.
      By Madeleine Gregory
      NASA’s Goddard Space Flight Center, Greenbelt, Md.
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      Last Updated Nov 26, 2024 Editor Rob Garner Contact Rob Garner rob.garner@nasa.gov Location Goddard Space Flight Center Related Terms
      Climate Change Earth Goddard Institute for Space Studies Goddard Space Flight Center Landsat Landsat 8 / LDCM (Landsat Data Continuity Mission) View the full article
    • By NASA
      5 Min Read Hats Off to NASA’s Webb: Sombrero Galaxy Dazzles in New Image
      NASA’s James Webb Space Telescope recently imaged the Sombrero galaxy with its MIRI (Mid-Infrared Instrument), resolving the clumpy nature of the dust along the galaxy’s outer ring. Credits:
      NASA, ESA, CSA, STScI In a new image from NASA’s James Webb Space Telescope, a galaxy named for its resemblance to a broad-brimmed Mexican hat appears more like an archery target.
      In Webb’s mid-infrared view of the Sombrero galaxy, also known as Messier 104 (M104), the signature, glowing core seen in visible-light images does not shine, and instead a smooth inner disk is revealed. The sharp resolution of Webb’s MIRI (Mid-Infrared Instrument) also brings into focus details of the galaxy’s outer ring, providing insights into how the dust, an essential building block for astronomical objects in the universe, is distributed. The galaxy’s outer ring, which appeared smooth like a blanket in imaging from NASA’s retired Spitzer Space Telescope, shows intricate clumps in the infrared for the first time.
      Image A: Sombrero Galaxy (MIRI Image)
      NASA’s James Webb Space Telescope recently imaged the Sombrero galaxy with its MIRI (Mid-Infrared Instrument), resolving the clumpy nature of the dust along the galaxy’s outer ring. This image includes filters representing 7.7-micron light as blue, 11.3-micron light as green, and 12.8-micron light as red. NASA, ESA, CSA, STScI Image B: Sombrero Galaxy (Hubble and Webb Image)
      Image Before/After Researchers say the clumpy nature of the dust, where MIRI detects carbon-containing molecules called polycyclic aromatic hydrocarbons, can indicate the presence of young star-forming regions. However, unlike some galaxies studied with Webb, including Messier 82, where 10 times as many stars are born than the Milky Way galaxy, the Sombrero galaxy is not a particular hotbed of star formation. The rings of the Sombrero galaxy produce less than one solar mass of stars per year, in comparison to the Milky Way’s roughly two solar masses a year.
      Even the supermassive black hole, also known as an active galactic nucleus, at the center of the Sombrero galaxy is rather docile, even at a hefty 9-billion-solar masses. It’s classified as a low luminosity active galactic nucleus, slowly snacking on infalling material from the galaxy, while sending off a bright, relatively small, jet.
      Also within the Sombrero galaxy dwell some 2,000 globular clusters, collections of hundreds of thousands of old stars held together by gravity. This type of system serves as a pseudo laboratory for astronomers to study stars — thousands of stars within one system with the same age, but varying masses and other properties is an intriguing opportunity for comparison studies.
      In the MIRI image, galaxies of varying shapes and colors litter the background of space. The different colors of these background galaxies can tell astronomers about their properties, including how far away they are.
      The Sombrero galaxy is around 30 million light-years from Earth in the constellation Virgo.
      Video: Sombrero Galaxy Fade (Spitzer, Webb, Hubble)
      A Bright Future Ahead
      Stunning images like this, and an array of discoveries in the study of exoplanets, galaxies through time, star formation, and our own solar system, are still just the beginning. Recently, scientists from all over the world applied for observation time with Webb during its fourth year of science operations, which begins in July 2025.
      General Observer time with Webb is more competitive than ever. A record-breaking 2,377 proposals were submitted by the Oct. 15, 2024, deadline, requesting about 78,000 hours of observation time. This is an oversubscription rate, the ratio defining the observation hours requested versus the actual time available in one year of Webb’s operations, of around 9 to 1.
      The proposals cover a wide array of science topics, with distant galaxies being among the most requested observation time, followed by exoplanet atmospheres, stars and stellar populations, then exoplanet systems.
      The Space Telescope Science Institute manages the proposal and program selection process for NASA. The submissions will now be evaluated by a Telescope Allocation Committee, a group of hundreds of members of the worldwide astronomical community, on a dual-anonymous basis, with selections announced in March 2025.
      While time on Webb is limited, data from all of Webb’s programs is publicly archived, immediately after it’s taken, or after a time of exclusive access, in the Mikulski Archive for Space Telescopes (MAST) so it can be used by anyone in the world.
      The James Webb Space Telescope is the world’s premier space science observatory. Webb is solving mysteries in our solar system, looking beyond to distant worlds around other stars, and probing the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).
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      Media Contacts
      Laura Betz – laura.e.betz@nasa.gov
      NASA’s Goddard Space Flight Center, Greenbelt, Md.
      Hannah Braun – hbraun@stsci.edu, Christine Pulliam – cpulliam@stsci.edu
      Space Telescope Science Institute, Baltimore, Md.
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      Webb is the premier observatory of the next decade, serving thousands of astronomers worldwide. It studies every phase in the…


      Galaxies



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      Messier 104 (The Sombrero Galaxy)


      Hubble easily resolves some of the Sombrero galaxy’s roughly 2,000 globular clusters.

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      Last Updated Nov 25, 2024 Editor Marty McCoy Contact Laura Betz laura.e.betz@nasa.gov Related Terms
      Astrophysics Galaxies Goddard Space Flight Center James Webb Space Telescope (JWST) Science & Research Spiral Galaxies The Universe View the full article
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