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Science 5 January 2001:
Vol. 291. no. 5501, pp. 22 - 23
DOI: 10.1126/science.10.1126/SCIENCE.291.5501.22
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News of the Week

PLANETARY SCIENCE:
Jupiter's Two-Faced Moon, Ganymede, Falling Into Line

Richard A. Kerr

SAN FRANCISCO--At the fall meeting of the American Geophysical Union, researchers studying data returned by the Galileo spacecraft reported that Ganymede, like its neighbors Callisto and Europa, probably has a salty ocean. Ganymede's is far below its icy surface and far less promising of life than Europa's, however. Researchers now believe that Ganymede's more youthful-looking half could be due to a crust that stretched--as has happened in the past few million years on Europa--rather than any sort of icy volcanism, as many had assumed.

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