Body
Europa
An ice shell over a global ocean holding more water than all of Earth's seas.
Jupiter's ice moon, wrapped around a saltwater ocean holding perhaps twice the water of all Earth's seas. The cracked shell photographed by Voyager 2 made it the solar system's best bet for life.
Visited by
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Voyager 2
The only spacecraft to visit all four giant planets — still calling home from interstellar space.
year: 1979 · encounter: flyby