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Science 9 November 2001:
Vol. 294. no. 5545, pp. 1258 - 1259
DOI: 10.1126/science.294.5545.1258
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News of the Week

ASTROBIOLOGY:
Putting a Lid on Life on Europa

Richard A. Kerr

Now that the idea of an ocean on Jupiter's satellite Europa is generally accepted, the debate has shifted to how far below the icy surface it lies. If it's too far, even the most tenacious ocean life could be cut off from its best energy source-the sun-and heavily shielded from the prying eyes of astrobiologists. Now new information about how comets punch into Europa's surface, reported on page 1326, suggests that the ice is more than 3 to 4 kilometers thick, posing a great obstacle for life in Europa's ocean as well as for astrobiologists.

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