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Updated: Oct 4, 2025

Experimental Methods of Dust Charging and Mobilization on Surfaces with Exposure to Ultraviolet Radiation or Plasmas
Published on: April 3, 2018
Exogenic origin for the volatiles sampled by the Lunar CRater Observation and Sensing Satellite impact
K E Mandt1, O Mousis2, D Hurley3
1Johns Hopkins Applied Physics Laboratory, 11100 Johns Hopkins Rd, 20723, Laurel, MD, USA. Kathleen.Mandt@jhuapl.edu.
Abstract:
Returning humans to the Moon presents an unprecedented opportunity to determine the origin of volatiles stored in the permanently shaded regions (PSRs), which trace the history of lunar volcanic activity, solar wind surface chemistry, and volatile delivery to the Earth and Moon through impacts of comets, asteroids, and micrometeoroids. So far, the source of the volatiles sampled by the Lunar Crater Observation and Sensing Satellite (LCROSS) plume has remained undetermined. We show here that the source could not be volcanic outgassing and the composition is best explained by cometary impacts. Ruling out a volcanic source means that volatiles in the top 1-3 meters of the Cabeus PSR regolith may be younger than the latest volcanic outgassing event (~1 billion years ago; Gya).
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