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At a ceremony today at the National Federation of the Blind, NASA unveiled a new book that brings majestic images taken by its Great Observatories to the fingertips of the blind. "Touch the Invisible Sky" is a 60-page book with color images of nebulae, stars, galaxies and some of the telescopes that captured the original pictures. Braille and large-print descriptions accompany each of the book's 28 photographs, making the book's design accessible to readers of all visual abilities.The book contains spectacular images from the Hubble Space Telescope, Chandra X-ray Observatory, Spitzer Space Telescope and powerful ground-based telescopes. The celestial objects are presented as they appear through visible-light telescopes and different spectral regions invisible to the naked eye, from radio to infrared, visible, ultraviolet and X-ray light.

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    • By NASA
      NASA Administrator Bill Nelson, left, and U.S. Department of State Acting Assistant Secretary in the Bureau of Oceans and International Environmental and Scientific Affairs Jennifer R. Littlejohn, right, look on as Ambassador of the Republic of Austria to the United States of America Petra Schneebauer, signs the Artemis Accords, Wednesday, Dec. 11, 2024, at the Mary W. Jackson NASA Headquarters building in Washington. The Republic of Austria is the 50th country to sign the Artemis Accords, which establish a practical set of principles to guide space exploration cooperation among nations participating in NASA’s Artemis program. Credit: NASA/Joel Kowsky
      Lee esta nota de prensa en español aquí.
      Panama and Austria signed the Artemis Accords Wednesday during separate signing ceremonies at NASA Headquarters in Washington, becoming the 49th and 50th nations to commit to the responsible exploration of space for all humanity.
      “NASA welcomes Panama and Austria to the Artemis Accords community and celebrates 50 countries united by shared principles for the safe and responsible exploration of space,” NASA Administrator Bill Nelson said. “More than ever before, NASA is opening space to more nations and more people for the benefit of all. Together we are building long-term and peaceful deep space exploration for the Artemis Generation.”
      In just a few years, the original group of eight country signatories including the United States has multiplied, with 17 countries signings in 2024. More than a number, the Artemis Accords represent a robust community, from every region of the world, unified by the same goal: to ensure safe and responsible civil space exploration.  
      Through the Artemis Accords, the United States and other signatories are progressing toward continued safe and sustainable exploration of space with concrete outcomes. They committed to a method of operation and set of recommendations on non-interference, interoperability, release of scientific data, long-term sustainability guidelines, and registration to advance the implementation of the Artemis Accords. 
      Potential focus areas for the next year include further advancing sustainability, including debris management for both lunar orbit and the surface of the Moon. 
      Austria Joins Artemis Accords
      Petra Schneebauer, ambassador of the Republic of Austria to the United States, signed the accords on behalf of Austria, becoming the 50th country signatory.
      “Austria is proud to sign the Artemis Accords, an important step in fostering international cooperation for the civil exploration of the Moon and expanding humanity’s presence in the cosmos,” said Schneebauer. “By signing the Accords, we reaffirm our commitment to the peaceful, responsible, and cooperative use of space while emphasizing our support for strong multilateral partnerships and scientific progress. This cooperation will open new prospects for Austrian businesses, scientists, and research institutions to engage in pioneering space initiatives.”
      Jennifer Littlejohn, acting assistant secretary, Bureau of Oceans and International Environmental and Scientific Affairs, U.S. Department of State, also participated in Austria’s signing event.
      Panama Joins Artemis Accords
      Earlier Wednesday, Nelson hosted Panama for a signing ceremony. José Miguel Alemán Healy, ambassador of the Republic of Panama to the United States, signed the Artemis Accords on behalf of Panama. Principal Deputy Assistant Secretary Tony Fernandes for U.S. Department of State’s Bureau of Oceans and International Environmental and Scientific Affairs also participated in the event.
      NASA Administrator Bill Nelson, left, Ambassador of the Republic of Panama to the United States of America José Miguel Alemán Healy, center, and U.S. Department of State Principal Deputy Assistant Secretary in the Bureau of Oceans and International Environmental and Scientific Affairs Tony Fernandes, pose for a picture after the Republic of Panama signed the Artemis Accords, Wednesday, Dec. 11, 2024, at the Mary W. Jackson NASA Headquarters building in Washington. The Republic of Panama is the 49th country to sign the Artemis Accords, which establish a practical set of principles to guide space exploration cooperation among nations participating in NASA’s Artemis program. Credit: NASA/Joel Kowsky “Today, Panama takes its place among many other nations looking not just to our own horizons, but to the horizons beyond our planet – exploring, learning, and contributing to humanity’s collective knowledge,” said Alemán.”This moment represents far more than a diplomatic signature. It is a bold commitment to peaceful exploration, scientific discovery, and international collaboration.”
      In 2020, the United States, led by NASA with the U.S. Department of State, and seven other initial signatory nations established the Artemis Accords, identifying a set of principles promoting the beneficial use of space for humanity.
      The Artemis Accords are grounded in the Outer Space Treaty and other agreements including the Registration Convention, the Rescue and Return Agreement, as well as best practices and norms of responsible behavior that NASA and its partners have supported, including the public release of scientific data.   
      The accords are a voluntary commitment to engage in safe, transparent, responsible behavior in space, and any nation that wants to commit to those values is welcome to sign.
      Learn more about the Artemis Accords at:
      https://www.nasa.gov/artemis-accords
      -end-
      Meira Bernstein / Elizabeth Shaw
      Headquarters, Washington
      202-358-1600
      meira.b.bernstein@nasa.gov / elizabeth.a.shaw@nasa.gov
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      Last Updated Dec 11, 2024 LocationNASA Headquarters Related Terms
      Bill Nelson Office of International and Interagency Relations (OIIR) View the full article
    • By NASA
      5 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      Watersheds on the U.S. Eastern Seaboard will be among the areas most affected by underground saltwater intrusion by the year 2100 due to sea level rise and changes in groundwater supplies, according to a NASA-DOD study. NASA’s Terra satellite captured this image on April 21, 2023. Intrusion of saltwater into coastal groundwater can make water there unusable, damage ecosystems, and corrode infrastructure.
      Seawater will infiltrate underground freshwater supplies in about three of every four coastal areas around the world by the year 2100, according to a recent study led by researchers at NASA’s Jet Propulsion Laboratory in Southern California. In addition to making water in some coastal aquifers undrinkable and unusable for irrigation, these changes can harm ecosystems and corrode infrastructure.
      Called saltwater intrusion, the phenomenon happens below coastlines, where two masses of water naturally hold each other at bay. Rainfall on land replenishes, or recharges, fresh water in coastal aquifers (underground rock and soil that hold water), which tends to flow below ground toward the ocean. Meanwhile, seawater, backed by the pressure of the ocean, tends to push inland. Although there’s some mixing in the transition zone where the two meet, the balance of opposing forces typically keeps the water fresh on one side and salty on the other.
      Now, two impacts of climate change are tipping the scales in favor of salt water. Spurred by planetary warming, sea level rise is causing coastlines to migrate inland and increasing the force pushing salt water landward. At the same time, slower groundwater recharge — due to less rainfall and warmer weather patterns — is weakening the force moving the underground fresh water in some areas.
      Worldwide Intrusion
      Saltwater intrusion will affect groundwater in about three of every four coastal aquifers around the world by the year 2100, a NASA-DOD study estimates. Saltwater can make groundwater in coastal areas undrinkable and useless for irrigation, as well as harm ecosystems and corrode infrastructure.NASA/JPL-Caltech The study, published in Geophysical Research Letters in November, evaluated more than 60,000 coastal watersheds (land area that channels and drains all the rainfall and snowmelt from a region into a common outlet) around the world, mapping how diminished groundwater recharge and sea level rise will each contribute to saltwater intrusion while estimating what their net effect will be.
      Considering the two factors separately, the study’s authors found that by 2100 rising sea levels alone will tend to drive saltwater inland in 82% of coastal watersheds studied. The transition zone in those places would move a relatively modest distance: no more than 656 feet (200 meters) from current positions. Vulnerable areas include low-lying regions such as Southeast Asia, the coast around the Gulf of Mexico, and much of the United States’ Eastern Seaboard.  
      Meanwhile, slower recharge on its own will tend to cause saltwater intrusion in 45% of the coastal watersheds studied. In these areas, the transition zone would move farther inland than it will from sea level rise — as much as three-quarters of a mile (about 1,200 meters) in some places. The regions to be most affected include the Arabian Peninsula, Western Australia, and Mexico’s Baja California peninsula. In about 42% of coastal watersheds, groundwater recharge will increase, tending to push the transition zone toward the ocean and in some areas overcoming the effect of saltwater intrusion by sea level rise.
      All told, due to the combined effects of changes in sea level and groundwater recharge, saltwater intrusion will occur by century’s end in 77% of the coastal watersheds evaluated, according to the study.
      Generally, lower rates of groundwater recharge are going to drive how far saltwater intrudes inland, while sea level rise will determine how widespread it is around the world. “Depending on where you are and which one dominates, your management implications might change,” said Kyra Adams, a groundwater scientist at JPL and the paper’s lead author. 
      For example, if low recharge is the main reason intrusion is happening in one area, officials there might address it by protecting groundwater resources, she said. On the other hand, if the greater concern is that sea level rise will oversaturate an aquifer, officials might divert groundwater.
      Global Consistency
      Co-funded by NASA and the U.S. Department of Defense (DOD), the study is part of an effort to evaluate how sea level rise will affect the department’s coastal facilities and other infrastructure. It used information on watersheds collected in HydroSHEDS, a database managed by the World Wildlife Fund that uses elevation observations from the NASA Shuttle Radar Topography Mission. To estimate saltwater intrusion distances by 2100, the researchers used a model accounting for groundwater recharge, water table rise, fresh- and saltwater densities, and coastal migration from sea level rise, among other variables.
      Study coauthor Ben Hamlington, a climate scientist at JPL and a coleader of NASA’s Sea Level Change Team, said that the global picture is analogous to what researchers see with coastal flooding: “As sea levels rise, there’s an increased risk of flooding everywhere. With saltwater intrusion, we’re seeing that sea level rise is raising the baseline risk for changes in groundwater recharge to become a serious factor.”
      A globally consistent framework that captures localized climate impacts is crucial for countries that don’t have the expertise to generate one on their own, he added.
      “Those that have the fewest resources are the ones most affected by sea level rise and climate change,” Hamlington said, “so this kind of approach can go a long way.”
      News Media Contacts
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      Jet Propulsion Laboratory, Pasadena, Calif.
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      Last Updated Dec 11, 2024 Related Terms
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    • By NASA
      Earth (ESD) Earth Explore Climate Change Science in Action Multimedia Data For Researchers About Us 4 min read
      NASA Study: Crops, Forests Responding to Changing Rainfall Patterns
      Earth’s rainy days are changing and plant life is responding. This visualization shows average precipitation for the entire globe based on more than 20 years of data from 2000 to 2023. Cooler colors indicate areas that receive less rain. Warm colors receive more rain. NASA’s Scientific Visualization Studio A new NASA-led study has found that how rain falls in a given year is nearly as important to the world’s vegetation as how much. Reporting Dec. 11 in Nature, the researchers showed that even in years with similar rainfall totals, plants fared differently when that water came in fewer, bigger bursts. 
      In years with less frequent but more concentrated rainfall, plants in drier environments like the U.S. Southwest were more likely to thrive. In humid ecosystems like the Central American rainforest, vegetation tended to fare worse, possibly because it could not tolerate the longer dry spells.
      Scientists have previously estimated that almost half of the world’s vegetation is driven primarily by how much rain falls in a year. Less well understood is the role of day-to-day variability, said lead author Andrew Feldman, a hydrologist and ecosystem scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. Shifting precipitation patterns are producing stronger rainstorms — with longer dry spells in between — compared to a century ago.
      “You can think of it like this: if you have a house plant, what happens if you give it a full pitcher of water on Sunday versus a third of a pitcher on Monday, Wednesday, and Friday?” said Feldman. Scale that to the size of the U.S. Corn Belt or a rainforest and the answer could have implications for crop yields and ultimately how much carbon dioxide plants remove from the atmosphere.
      Blooms in Desert
      The team, including researchers from the U.S. Department of Agriculture and multiple universities, analyzed two decades of field and satellite observations, spanning millions of square miles. Their study area encompassed diverse landscapes from Siberia to the southern tip of Patagonia.
      Yellow wildflowers and orange poppies carpet the desert following a wet winter for the Antelope Valley in California. NASA/Jim Ross They found that plants across 42% of Earth’s vegetated land surface were sensitive to daily rainfall variability. Of those, a little over half fared better — often showing increased growth — in years with fewer but more intense wet days. These include croplands as well as drier landscapes like grasslands and deserts.
      In contrast, broadleaf (e.g., oak, maple, and beech) forests and rainforests in lower and middle latitudes tended to fare worse under those conditions. The effect was especially pronounced in Indo-Pacific rainforests, including in the Philippines and Indonesia.
      Statistically, daily rainfall variability was nearly as important as annual rainfall totals in driving growth worldwide.
      Red Light, Green Light
      The new study relied primarily on a suite of NASA missions and datasets, including the Integrated Multi-satellitE Retrievals for GPM (IMERG) algorithm, which provides rain and snowfall rates for most of the planet every 30 minutes using a network of international satellites.
      To gauge plant response day to day, the researchers calculated how green an area appeared in satellite imagery. “Greenness”, also known asthe Normalized Difference Vegetation Index, is commonly used to estimate vegetation density and health. They also tracked a faint reddish light that plants emit during photosynthesis, when a plant absorbs sunlight to convert carbon dioxide and water into food, its chlorophyll “leaks” unused photons. This faint light is called solar-induced fluorescence, and it’s a telltale sign of flourishing vegetation.
      Growing plants emit a form of light detectable by NASA satellites orbiting hundreds of miles above Earth. Parts of North America appear to glimmer in this visualization, depicting an average year. Gray indicates regions with little or no fluorescence; red, pink, and white indicate high fluorescence. NASA Scientific Visualization Studio Not visible bythe naked eye, plant fluorescence can be detected by instruments aboard satellites such as NASA’s Orbiting Carbon Observatory-2 (OCO-2). Launched in 2014, OCO-2 has observed the U.S. Midwest fluorescing strongly during the growing season.
      Feldman said the findings highlight the vital role that plants play in moving carbon around Earth — a process called the carbon cycle. Vegetation, including crops, forests, and grasslands, forms a vast carbon “sink,” absorbing excess carbon dioxide from the atmosphere.
      “A finer understanding of how plants thrive or decline day to day, storm by storm, could help us better understand their role in that critical cycle,” Feldman said.
      The study also included researchers from NASA’s Jet Propulsion Laboratory in Southern California, Stanford University, Columbia University, Indiana University, and the University of Arizona.
      By Sally Younger
      NASA’s Earth Science News Team
      About the Author
      Sally Younger

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    • By NASA
      3 Min Read They Grow So Fast: Moon Tree Progress Since NASA’s Artemis I Mission
      In the two years since NASA’s Orion spacecraft returned to Earth with more than 2,000 tree seedlings sourced in a partnership with USDA Forest Service, Artemis I Moon trees have taken root at 236 locations across the contiguous United States. Organizations are cultivating more than just trees, as they nurture community connections, spark curiosity about space, and foster a deeper understanding of NASA’s missions.
      Universities, federal agencies, museums, and other organizations who were selected to be Moon tree recipients have branched out to provide their community unique engagements with their seedling.
      Children sitting in a circle around a newly planted Moon tree and learning about NASA’s Artemis I mission. Adria Gillespie “Through class visits to the tree, students have gained a lot of interest in caring for the tree, and their curiosity for the unknown in outer space sparked them to do research of their own to get answers to their inquiries,” said Adria Gillespie, the district science coach at Greenfield Union School District in Greenfield, California.
      The presence of a Moon tree at schools has blossomed into more student engagements surrounding NASA’s missions. Along with planting their American Sycamore, students from Eagle Pointe Elementary in Plainfield, Illinois, are participating in a Lunar Quest club to learn about NASA and engage in a simulated field trip to the Moon.
      Eagle Pointe Elementary students also took part in a planting ceremony for their seedling, where they buried a time capsule with the seed, and established a student committee responsible for caring for their Moon tree.
      At Marshall STEMM Academy in Toledo, Ohio, second grade students were assigned reading activities associated with their Moon tree, fourth graders created Moon tree presentations to show the school, and students engaged with city leaders and school board members to provide a Moon tree dedication.
      Two individuals planting a Moon tree. Brandon Dillman A seedling sent to The Gathering Garden in Mount Gilead, North Carolina, is cared for by community volunteers. Lessons with local schools and 4-H clubs, as well as the establishment of newsletters and social media to maintain updates, have sprouted from The Gathering Garden’s Loblolly Pine.
      Sprucing Up the Moon Trees’ Environment
      In addition to nurturing their Moon tree, many communities have planted other trees alongside their seedling to foster a healthier environment. In Castro Valley, California, a non-profit called ForestR planted oak, fir, and sequoia trees to nestle their seedling among a tree “family.”
      New homes for additional Moon tree seedlings are being identified each season through Fall 2025. Communities continue to track how the impact of NASA’s science and innovation grows alongside their Moon trees.
      NASA’s “new generation” Moon trees originally blossomed from NASA’s Apollo 14 mission, where NASA astronaut Stuart Roosa carried tree seeds into lunar orbit. NASA’s Next Generation STEM project partnered with USDA Forest Service to bring Moon trees to selected organizations. As NASA continues to work for the benefit of all, its Moon trees have demonstrated how one tiny seed can sprout positive change for communities, the environment, and education.
      Learn more about NASA’s STEM engagements: https://stem.nasa.gov
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    • By NASA
      5 min read
      Preparations for Next Moonwalk Simulations Underway (and Underwater)
      NASA’s Ingenuity Mars Helicopter, right, stands near the apex of a sand ripple in an image taken by Perseverance on Feb. 24, 2024, about five weeks after the rotorcraft’s final flight. Part of one of Ingenuity’s rotor blades lies on the surface about 49 feet (15 meters) west of helicopter (at left in image).NASA/JPL-Caltech/LANL/CNES/CNRS The review takes a close look the final flight of the agency’s Ingenuity Mars Helicopter, which was the first aircraft to fly on another world.
      Engineers from NASA’s Jet Propulsion Laboratory in Southern California and AeroVironment are completing a detailed assessment of the Ingenuity Mars Helicopter’s final flight on Jan. 18, 2024, which will be published in the next few weeks as a NASA technical report. Designed as a technology demonstration to perform up to five experimental test flights over 30 days, Ingenuity was the first aircraft on another world. It operated for almost three years, performed 72 flights, and flew more than 30 times farther than planned while accumulating over two hours of flight time.
      The investigation concludes that the inability of Ingenuity’s navigation system to provide accurate data during the flight likely caused a chain of events that ended the mission. The report’s findings are expected to benefit future Mars helicopters, as well as other aircraft destined to operate on other worlds.
      To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video
      NASA’s Ingenuity Mars Helicopter used its black-and-white navigation camera to capture this video on Feb. 11, 2024, showing the shadow of its rotor blades. The imagery confirmed damage had occurred during Flight 72. NASA/JPL-Caltech Final Ascent
      Flight 72 was planned as a brief vertical hop to assess Ingenuity’s flight systems and photograph the area. Data from the flight shows Ingenuity climbing to 40 feet (12 meters), hovering, and capturing images. It initiated its descent at 19 seconds, and by 32 seconds the helicopter was back on the surface and had halted communications. The following day, the mission reestablished communications, and images that came down six days after the flight revealed Ingenuity had sustained severe damage to its rotor blades.
      What Happened
      “When running an accident investigation from 100 million miles away, you don’t have any black boxes or eyewitnesses,” said Ingenuity’s first pilot, Håvard Grip of JPL. “While multiple scenarios are viable with the available data, we have one we believe is most likely: Lack of surface texture gave the navigation system too little information to work with.”
      The helicopter’s vision navigation system was designed to track visual features on the surface using a downward-looking camera over well-textured (pebbly) but flat terrain. This limited tracking capability was more than sufficient for carrying out Ingenuity’s first five flights, but by Flight 72 the helicopter was in a region of Jezero Crater filled with steep, relatively featureless sand ripples.
      This short animation depicts a NASA concept for a proposed follow-on to the agency’s Ingenuity Mars Helicopter called Mars Chopper, which remains in early conceptual and design stages. In addition to scouting, such a helicopter could carry science instruments to study terrain rovers can’t reach. One of the navigation system’s main requirements was to provide velocity estimates that would enable the helicopter to land within a small envelope of vertical and horizontal velocities. Data sent down during Flight 72 shows that, around 20 seconds after takeoff, the navigation system couldn’t find enough surface features to track.
      Photographs taken after the flight indicate the navigation errors created high horizontal velocities at touchdown. In the most likely scenario, the hard impact on the sand ripple’s slope caused Ingenuity to pitch and roll. The rapid attitude change resulted in loads on the fast-rotating rotor blades beyond their design limits, snapping all four of them off at their weakest point — about a third of the way from the tip. The damaged blades caused excessive vibration in the rotor system, ripping the remainder of one blade from its root and generating an excessive power demand that resulted in loss of communications.
      This graphic depicts the most likely scenario for the hard landing of NASA’s Ingenuity Mars Helicopter during its 72nd and final flight on Jan. 18, 2024. High horizontal velocities at touchdown resulted in a hard impact on a sand ripple, which caused Ingenuity to pitch and roll, damaging its rotor blades. NASA/JPL-Caltech Down but Not Out
      Although Flight 72 permanently grounded Ingenuity, the helicopter still beams weather and avionics test data to the Perseverance rover about once a week. The weather information could benefit future explorers of the Red Planet. The avionics data is already proving useful to engineers working on future designs of aircraft and other vehicles for the Red Planet.
      “Because Ingenuity was designed to be affordable while demanding huge amounts of computer power, we became the first mission to fly commercial off-the-shelf cellphone processors in deep space,” said Teddy Tzanetos, Ingenuity’s project manager. “We’re now approaching four years of continuous operations, suggesting that not everything needs to be bigger, heavier, and radiation-hardened to work in the harsh Martian environment.”
      Inspired by Ingenuity’s longevity, NASA engineers have been testing smaller, lighter avionics that could be used in vehicle designs for the Mars Sample Return campaign. The data is also helping engineers as they research what a future Mars helicopter could look like — and do.
      During a Wednesday, Dec. 11, briefing at the American Geophysical Union’s annual meeting in Washington, Tzanetos shared details on the Mars Chopper rotorcraft, a concept that he and other Ingenuity alumni are researching. As designed, Chopper is approximately 20 times heavier than Ingenuity, could fly several pounds of science equipment, and autonomously explore remote Martian locations while traveling up to 2 miles (3 kilometers) in a day. (Ingenuity’s longest flight was 2,310 feet, or 704 meters.)
      “Ingenuity has given us the confidence and data to envision the future of flight at Mars,” said Tzanetos.
      More About Ingenuity
      The Ingenuity Mars Helicopter was built by JPL, which also manages the project for NASA Headquarters. It is supported by NASA’s Science Mission Directorate. NASA’s Ames Research Center in California’s Silicon Valley and NASA’s Langley Research Center in Hampton, Virginia, provided significant flight performance analysis and technical assistance during Ingenuity’s development. AeroVironment, Qualcomm, and SolAero also provided design assistance and major vehicle components. Lockheed Space designed and manufactured the Mars Helicopter Delivery System. At NASA Headquarters, Dave Lavery is the program executive for the Ingenuity Mars helicopter.
      For more information about Ingenuity:
      https://mars.nasa.gov/technology/helicopter
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      NASA Headquarters, Washington
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      Last Updated Dec 11, 2024 Related Terms
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