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Science 1 January 1999:
Vol. 283. no. 5398, pp. 15 - 16
DOI: 10.1126/science.283.5398.15a
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News of the Week

PLANETARY SCIENCE:
Moon-Forming Crash Is Likely in New Model

Dana Mackenzie

Planetary scientists believe that sometime in the first 100 million years after the solar system took shape from gas and dust, a Mars-sized planet smashed into Earth. The impact liquefied Earth's surface and ejected a huge blob of material that coalesced into the moon. New computer simulations suggest that far from being a chance encounter that defied all the odds, an impact like this is expected to occur in the solar system's first 100 million years.

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