In the search for extraterrestrial life, Jupiter's moon Ganymede, the largest in the solar system, is no Europa. The salty subsurface ocean it likely harbors is much farther below its surface than is Europa's probable liquid ocean, and it's sandwiched between layers of ice, leading most scientists to conclude that the prospects for life on--or inside-- Ganymede are dim.
A joint NASA/ESA mission to both Europa and Ganymede is proposed to launch in 2020.
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