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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 hide caption

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NASA/JPL

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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NASA/JPL-Caltech

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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NASA/JPL-Caltech

'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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Bloomberg via Getty Images

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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Chris Carlson/AP