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Science 11 April 2008:
Vol. 320. no. 5873, pp. 165 - 166
DOI: 10.1126/science.320.5873.165a
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News of the Week

PLANETARY GEOLOGY:
An Early Big Hit to Mars May Have Scarred the Planet for Life

Richard A. Kerr

Two new studies purport to ease the difficulties with the theory that a giant impact battered the young Mars.

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