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Science 18 May 2007:
Vol. 316. no. 5827, pp. 993 - 994
DOI: 10.1126/science.1141971
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Perspectives

PLANETARY SCIENCE:
The Shifting Sands of Asteroids

Erik Asphaug

A tiny asteroid, expected to be solid, turns out to be an active pile of gravel.

The author is in the Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA 95064, USA. E-mail: asphaug{at}pmc.ucsc.edu

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