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Two Wet Moons

NASA recently chose Europa over Titan as the destination for a future outer-planets mission.

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Search for Life Heads to the Outer Solar System
Article | Europa vs. Titan. They're two moons in the outer solar system, both circling gas giants but otherwise as alien from each other as alien can be. One orbits Jupiter and is a crusty iceball with signs of a very deep subsurface ocean. The other orbits Saturn and has a thick atmosphere, dramatic weath...

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