(Picture Credits: NASA – Moon Mineralogy Mapper instrument)
For years speculation existed about ice on the Moon but a definitive confirmation never came. Previous results allowed for alternative explanations but data from more recent missions is conclusive. Research published in the Proceedings of the National Academy of Sciences on August 20, 2018 finally puts all doubts to rest.
This means our lunar colonists can have their Martini on the rocks…and produce all the propellant required for their return trip.
from the abstract of the PNAS article:
“Water ice may be allowed to accumulate in permanently shaded regions on airless bodies in the inner solar system such as Mercury, the Moon, and Ceres [Watson K, et al. (1961) J Geophys Res 66:3033–3045]. Unlike Mercury and Ceres, direct evidence for water ice exposed at the lunar surface has remained elusive. We utilize indirect lighting in regions of permanent shadow to report the detection of diagnostic near-infrared absorption features of water ice in reflectance spectra acquired by the Moon Mineralogy Mapper [M (3)] instrument. Several thousand M (3) pixels (∼280 × 280 m) with signatures of water ice at the optical surface (depth of less than a few millimeters) are identified within 20° latitude of both poles, including locations where independent measurements have suggested that water ice may be present. Most ice locations detected in M (3) data also exhibit lunar orbiter laser altimeter reflectance values and Lyman Alpha Mapping Project instrument UV ratio values consistent with the presence of water ice and also exhibit annual maximum temperatures below 110 K. However, only ∼3.5% of cold traps exhibit ice exposures. Spectral modeling shows that some ice-bearing pixels may contain ∼30 wt % ice that is intimately mixed with dry regolith. The patchy distribution and low abundance of lunar surface-exposed water ice might be associated with the true polar wander and impact gardening. The observation of spectral features of H2O confirms that water ice is trapped and accumulates in permanently shadowed regions of the Moon, and in some locations, it is exposed at the modern optical surface.”
For the full article, go to:
Shuai Li et al. Direct evidence of surface exposed water ice in the lunar polar regions, Proceedings of the National Academy of Sciences (2018). DOI: 10.1073/pnas.1802345115