PerspectiveAstronomy

Growing Apart in Lock Step

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Science  25 Aug 2006:
Vol. 313, Issue 5790, pp. 1054-1055
DOI: 10.1126/science.1128447

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Summary

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.