News of the WeekPlanetary Science

How Wet the Moon? Just Damp Enough to Be Interesting

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Science  22 Oct 2010:
Vol. 330, Issue 6003, pp. 434
DOI: 10.1126/science.330.6003.434

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The moon's recently discovered hydrosphere is nothing like Earth's watery regime. None of the moon's water is ever liquid. Water in its reservoirs can be imperceptibly sparse, flows into its reservoirs may proceed a few molecules at a time, and none may ever leave. And, as seen in the five reports of new water-related results from the moon beginning on page 463 of this week's issue of Science, many enigmas remain.