Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010psrd.repte.149t&link_type=abstract
Planetary Science Research Discoveries
Other
Moon, Lunar, Lunar Interior, Lunar Water, Kreep, Apatite, Lunar Mare Basalt, Water Content Of The Moon, Water In The Moon
Scientific paper
The discovery in 2008 by Alberto Saal (Brown University) and colleagues that lunar volcanic glasses contain water surprised lunar scientists: the Moon could no longer be viewed as being practically waterless. Francis McCubbin (Carnegie Institute of Washington) and coworkers there, at the Stony Brook University (New York), and Okayama University in Japan have confirmed the presence of water in the lunar interior and show that it is present in other types of igneous rocks, not just in those forming glassy volcanic deposits. McCubbin and colleagues measured the concentrations of fluorine, chlorine, and hydroxyl ion (OH-) in apatite (calcium phosphate) crystals in a lunar mare basalt sample and an igneous rock from the highlands. They found abundant water in the apatite crystals (hundreds to thousands of parts per million), which translates to at least 0.6 to 5 parts per million of H2O in the lunar interior. While less than that estimated by Alberto Saal and coworkers from volcanic glasses (tens of parts per million), it is still vastly larger than the next-to-nothing (less than one part per billion) of previous estimates. The higher water content has implications for the origin of the Moon and may shed light on how the inner planets acquired their water.
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