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Science 6 February 2009:
Vol. 323. no. 5915, p. 718
DOI: 10.1126/science.1167987
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Policy Forum

PLANETARY SCIENCE:
Biologically Reversible Exploration

Christopher P. McKay

International policies for protection of Mars and other planets from biological contamination need to be maintained and strengthened.

Space Sciences, NASA-Ames Research Center, Moffett Field, CA 94035, USA; christopher.mckay{at}nasa.gov

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