AI Article Synopsis
- The Moon is mostly dry, but the Deep Impact spacecraft discovered that its surface shows hydration at certain times of day, particularly near the North Pole.
- Hydration levels, which include hydroxyl and water, are influenced by temperature changes rather than total sunlight exposure, with mare basalts experiencing higher levels of hydration changes than highlands.
- The findings suggest a daily cycle of hydration and dehydration, likely due to a source of water-related ions from the solar wind.
Article Abstract
The Moon is generally anhydrous, yet the Deep Impact spacecraft found the entire surface to be hydrated during some portions of the day. Hydroxyl (OH) and water (H2O) absorptions in the near infrared were strongest near the North Pole and are consistent with <0.5 weight percent H2O. Hydration varied with temperature, rather than cumulative solar radiation, but no inherent absorptivity differences with composition were observed. However, comparisons between data collected 1 week (a quarter lunar day) apart show a dynamic process with diurnal changes in hydration that were greater for mare basalts (approximately 70%) than for highlands (approximately 50%). This hydration loss and return to a steady state occurred entirely between local morning and evening, requiring a ready daytime source of water-group ions, which is consistent with a solar wind origin.
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| http://dx.doi.org/10.1126/science.1179788 | DOI Listing |
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