New NASA evidence suggests that there's a chemical reaction taking place under the moon's icy surface that could provide conditions for life. NASA/JPL/Space Science Institute hide caption

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NASA/JPL/Space Science Institute

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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The mosaic was constructed from individual images obtained by the Solid State Imaging (SSI) system on NASA's Galileo spacecraft during six flybys of Europa between 1996 and 1999. NASA/JPL-Caltech/University of Arizona hide caption

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NASA/JPL-Caltech/University of Arizona