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Powering Enceladus' plumes

Astronomers in 2005 were astonished to find that Saturn's tiny, chilly moon Enceladus expels giant plumes of water vapor from an array of cracks marking its southern hemisphere. Because Enceladus is so small, researchers reasoned that it ought to have lost any interior source of heat long ago, and so should be frozen solid (SN: 5/6/06, p. 282).

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