Today's moon is Enceladus, a moon of Saturn.
Enceladus is one of only three bodies in the outer solar system where active eruptions have been observed (the other two are Jupiter's Io and Neptune's Triton). The geological activity is the result of tidal heating from Saturn's immense gravitational pull, and the cryovolcanism is thought to be the source of Saturn's diffuse E Ring.
Photo taken by Voyager 2 in August, 1981.
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