The Multiplying Mystery of Moonwater

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Researchers who once confidently stated that the Moon was bone-dry are now thinking the unthinkable: The Moon has so much water, there's actually a "lunar hydrosphere." International spacecraft have recently discovered no fewer than three "flavors" of moonwater and no one knows when the discoveries will end.

http://science.nasa.gov/headlines/y2010/18mar_moonwater.htm