PerspectivePlanetary Science

A Lunar Waterworld

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Science  23 Oct 2009:
Vol. 326, Issue 5952, pp. 531-532
DOI: 10.1126/science.1181471

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Since the first sample return missions of the 1960s, lunar scientists have operated under the presumption that the Moon is entirely dry. Three papers in this week's issue challenge that notion: Infrared spectroscopic measurements of the lunar surface from spacecraft provide unambiguous evidence for the presence of hydroxyl (OH) or water (13).