Reports

Lunar Thermal Anomalies: Infrared Observations

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Science  25 Apr 1969:
Vol. 164, Issue 3878, pp. 419-421
DOI: 10.1126/science.164.3878.419

Abstract

The lunar craters Tycho, Copernicus, and Aristarchus have been observed during lunar night at wavelengths between 3 and 14 microns. After an initial fast decrease to a color temperature of 220°K, the temperature remains nearly constant through the lunar night. The data suggest that these thermal anomalies (craters) contain hot and cold regions with the hot portions constituting 2 to 10 percent of the area and probably thermally connected to a subsurface temperatuer of about 200°K.