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Science 25 August 2006:
Vol. 313. no. 5790, pp. 1054 - 1055
DOI: 10.1126/science.1128447
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Perspectives

ASTRONOMY:
Growing Apart in Lock Step

Jack J. Lissauer

Like our Moon, Pluto's satellite system was probably produced by a giant impact. The orbits of the smaller Nix and Hydra apparently result from interactions with the larger moon Charon.

The author is at NASA, Ames Research Center Moffett Field, CA 94035, USA. E-mail: jlissauer{at}mail.arc.nasa.gov

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