Waters Appears to be Resurfacing  Ganymede,
One of Jupiter's Four Larger Moons

February 28, 2001  From the BBC:  "Jupiter's major moon, Ganymede, may be being resurfaced by water seeping on to its surface from the satellite's interior. This so-called cryomagma freezes out to form vast plains of ice that cover over rough terrain or old craters."  BBC Article

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Nasa Ganymede
A 3-D reconstruction of Ganymede's surface