PerspectivePlanetary Science

Solving Laplace's Lunar Puzzle

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Science  04 Aug 2006:
Vol. 313, Issue 5787, pp. 622-623
DOI: 10.1126/science.1131113

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Given its size and shape, the Moon's present orbit does not make sense. Its shape can be understood if, while the Moon was beginning to solidify, it was closer to Earth, with a more eccentric orbit.