Lunar Impact History
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Impacts on the moon (and the earth) increased about 400 Myr ago, a result that we published in SCIENCE in May, 2000. A follow-up investigation on impacts at the Apollo 12 site published in the Journal of Geophysical Research showed a weaker effect than we first reported. This increase, if real, may have implications both for evolution and our model of the solar system. There is an interesting interpretation of these data in terms of the Nemesis idea: see my paper " Measurements of lunar impacts ... and implications for the Nemesis theory." For more on the Nemesis idea. You can read all three papers below:
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