Europa and Titan are the two most interesting and different Moons in our solar system. Europa is an icy shell that probably harbors a salty ocean underneath. A rover with a heat missile of some design should be able to melt its way to the inside and find out if there is life. Titan has a nitrogen atmosphere that uses methane vapor for it's hydrological cycle, and probably frozen water underneath its surface. We need to send a rover to each to discover if we find life there and if man could survive there.
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