Lunar eclipses can yield information about the cooling of the Moon's soil when the Sun's radiation is suddenly removed and therefore about the soil's conductivity of heat and its structure. Infrared and radio-wavelength radiation from the Moon declines in intensity more slowly than does visible light emission during an eclipse because they are emitted from below the surface, and measurements indicate how far the different kinds of radiation penetrate into the lunar soil. Infrared observations show that at many "bright spots" the soil retains its heat much longer than in surrounding areas.
Because of the absence of a lunar atmosphere, the Moon's solid surface is exposed to the full intensity of ultraviolet and particulate radiation from the Sun, which may give rise to fluorescence in some rock materials. Observations during lunar eclipses have given positive results for this phenomenon, with the appearance of abnormal bright regions in eclipse-obscured parts of the Moon
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