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Science 17 November 2006:
Vol. 314. no. 5802, p. 1045
DOI: 10.1126/science.314.5802.1045e
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This Week in Science

Noble gas isotope ratios in lunar soils differ from those of the solar wind, and the explanation given has been that the lunar soils recorded a second component of energetic solar noble-gas particles that may have been stronger in the past but that is not now identifiable. Grimberg et al. (p. 1133) measured how neon in the solar wind decomposes when caught in glass detectors on the Genesis spacecraft, and they observed a change in isotope ratio with depth of implantation caused by fractionation. This process can explain the variation seen on the Moon's surface without recourse to other mechanisms.




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