Congress is requiring NASA to travel to Jupiter's moon Europa by 2022. Currently, it is the space agency's only new mission planned for the outer solar system. NASA/JPL-Caltech/SETI Institute hide caption

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What Comes Next For NASA After Juno? Not Much

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When it named this mission, NASA acknowledged its difficulty. Juno was a Roman goddess, the agency notes, "who was Jupiter's wife, and who could also see through clouds." NASA/JPL-Caltech hide caption

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This illustration show's NASA's Juno mission approaching Jupiter. Juno used distant stars to chart its course across the void. NASA/JPL-Caltech hide caption

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'Star Trackers' Help Juno Find Its Way

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Buildings are seen shrouded in smog from the 102nd floor of Seoul's Lotte World Tower in December 2015. Bloomberg via Getty Images hide caption

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Korea's Air Is Dirty, But It's Not All Close-Neighbor China's Fault

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The last remaining space shuttle external propellant tank is moved across the 405 freeway in Los Angeles on Saturday. The ET-94 will be displayed with the retired space shuttle Endeavour at the California Science Center. Chris Carlson/AP hide caption

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This artist's concept depicts some of the planetary discoveries made by NASA's Kepler Space Telescope. Tuesday's announcement more than doubles the number of verified planets discovered by the Kepler mission. W. Stenzel/NASA hide caption

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NASA Spots 1,284 New Planets, Including 9 That Are 'Potentially Habitable'

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An artist's rendering of the BEAM inflatable annex attached to the side of the International Space Station. Courtesy of Bigelow Aerospace hide caption

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NASA To Test Inflatable Room For Astronauts In Space

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Bob Ebeling with his daughter Kathy (center) and his wife, Darlene. Howard Berkes/NPR hide caption

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Challenger Engineer Who Warned Of Shuttle Disaster Dies

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A Martian gravity map shows the Tharsis volcanoes and surrounding flexure. The white areas in the center are higher-gravity regions produced by the massive Tharsis volcanoes, and the surrounding blue areas are lower-gravity regions that may be cracks in the crust (lithosphere). MIT/UMBC-CRESST/GSFC via NASA hide caption

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NASA has set a new launch opportunity, beginning May 5, 2018, for the InSight mission to Mars. This artist's concept depicts the InSight lander on Mars after the lander's robotic arm has deployed a seismometer and a heat probe directly onto the ground. NASA/JPL-Caltech hide caption

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Expedition 43 NASA astronaut Scott Kelly (left) and his identical twin, Mark Kelly, pose for a photograph in 2015 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Bill Ingalls/NASA/Getty Images hide caption

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'Everybody Stretches' Without Gravity: Mark Kelly Talks About NASA's Twins Study

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U.S. astronaut Scott Kelly shows a victory sign after landing safely on Earth after nearly a year in space. Kirill Kudryavtsev/AFP/Getty Images hide caption

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Astronauts Back Home After A Year In Space

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Kelly posted this photo of an aurora taken from the International Space Station to Twitter on Aug. 15, 2015. NASA hide caption

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Scott Kelly Reflects On His Year Off The Planet

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A camera in the gondola of his balloon photographs Air Force Captain Joseph M. Kittinger Jr., as he starts the jump that set his record-breaking parachute jump over southern New Mexico on Aug. 8, 1960. Bettman/Corbis hide caption

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What It's Like To Freefall From 20 Miles Above The Earth

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