Plumes of Enceladus
Enceladus is a mid-sized satellite of Saturn, about 500 km across, known since 1789. In 2005, the
Cassini spacecraft discovered that this relatively small world is, surprisingly, geologically
active. Geyser-like jets of water were seen spewing from the moon's south-polar surface ices, vented
by a process called cyrovolcanism ('cold volcanism'). Another satellite, Mimas, is seen on Saturn's
ring plane.
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