Jupiter Icy Moons Orbiter

(redirected from Prometheus I)

Jupiter Icy Moons Orbiter

A 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.