Image: Tattooed Mars
Image Credit: NASA/JPL-Caltech/University of Arizona
Originally released Aug. 1, 2007, this image is of Mars' Russell Crater dune field, which is covered seasonally by carbon dioxide frost.
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Based on the vapor pressure/temperature diagram, that means that the temperature in the Russell crater must be less than -120 deg C (ca. -180 F). Has that low a temperature been measured there? Or is this just speculation.