Martian surface frost, made up largely of carbon dioxide, appears blueish-white in these images from the Thermal Emission Imaging System (THEMIS) camera aboard NASA's 2001 Odyssey orbiter. THEMIS takes images in both visible light perceptible to the human eye and heat-sensitive infrared.

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Photo credit: © NASA/piemags / Alamy / Afripics
License: Licensed
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Keywords: ., 2001, mars, odyssey