Jupiter Icy Moons Orbiter
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Jupiter Icy Moons OrbiterA proposed NASA probe set to orbit Jupiter's large moons Ganymede, Callisto, and Europa. The earlier probe Galileo found evidence suggesting that these satellites may harbor vast oceans beneath their icy surfaces. The Jupiter Icy Moons Orbiter is not planned for launch until 2015 or later. It may be the first nuclear-powered spacecraft.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006