PerspectivePlanetary Science

Glass Beads Tell a Tale of Lunar Bombardment

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Science  10 Mar 2000:
Vol. 287, Issue 5459, pp. 1768-1769
DOI: 10.1126/science.287.5459.1768

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Earth and the moon have been bombarded by asteroids and comets throughout their history, but this bombardment has not been constant, as Ryder discusses in this Perspective. Lunar and terrestrial observations have suggested that in the past 200 million years or so, bombardment was more severe than in the preceding 3 billion years, but conclusive evidence has been lacking. Culler et al. (page 1785) have now dated glass beads in lunar soil samples returned by the Apollo 14 mission, which substantiate the previous suggestions.