How Asteroids Come to Earth

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Science  25 Sep 1998:
Vol. 281, Issue 5385, pp. 1971-1973
DOI: 10.1126/science.281.5385.1971

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Although it has long been assumed that material from the asteroid belt between Mars and Jupiter reaches Earth in the form of meteorites, the details of that process are unknown. In his Perspective, Greenberg discusses results reported in the same issue by Migliorini et al. on a scenario in which weak orbital resonances cause chaotic behavior that results in objects breaking away from the main belt. The results support one of the classical mechanisms for delivery of asteroid material to Earth.