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Science 6 January 2006:
Vol. 311. no. 5757, p. 29
DOI: 10.1126/science.311.5757.29
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News of the Week

PLANETARY SCIENCE:
How Saturn's Icy Moons Get a (Geologic) Life

Richard A. Kerr

SAN FRANCISCO, CALIFORNIA--Why is there geology on Saturn's icy satellites? A group of Cassini team members puzzling over the odd shape of Iapetus has hit on a possible explanation. Perhaps the moons formed early and grabbed just enough heat-generating radioactivity from the nascent solar system. (Read more.)

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Science. ISSN 0036-8075 (print), 1095-9203 (online)