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Saturn Geyser Moon Hiding Global Ocean

By measuring tiny wobbles in Enceladus' orbit, scientists have figured out that Enceladus has a giant ocean.

September 16, 2015
11:45 AM EDT
An artist's rendering of Enceladus' solid core, liquid subsurface ocean and icy shell, along with hydrothermal vents in the southern pole from which geysers flow. | NASA/JPL-Caltech