Saturn's icy moon Enceladus may keep oceans liquid with wobble

NASA's Cassini spacecraft discovered a giant plume of water gushing from cracks in the surface near the south pole of Saturn's moon Enceladus in 2005, indicating that there was a reservoir of water beneath the ice. Cassini data also suggest that the south polar has been continuously releasing about 13 billion watts of energy. But how does Enceladus stay warm enough to maintain liquid water underground?

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