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Returning humans to the Moon presents an unprecedented opportunity todetermine the origin of volatiles stored in the permanently shaded regions(PSRs), which trace the history of lunar volcanic activity, solar wind surfacechemistry, and volatile delivery to the Earth and Moon through impacts ofcomets, asteroids, and micrometeoroids. So far, the source of the volatilessampled by the Lunar Crater Observation and Sensing Satellite (LCROSS) plumehas remained undetermined. We show here that the source could not be volcanicoutgassing and the composition is best explained by cometary impacts. Rulingout a volcanic source means that volatiles in the top 1-3 meters of the CabeusPSR regolith may be younger than the latest volcanic outgassing event (~1billion years ago; Gya).

Exogenic origin for the volatiles sampled by the Lunar CRater Observation and Sensing Satellite impact