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https://science.nasa.gov/photojournal/frost-free-north-polar-layers-in-the-good-old-summertime/
Frost-free North Polar Layers in the Good Old Summertime - NASA Science
Oct 17, 2006 - NASA's Mars Global Surveyor shows a nearly ice-free view of layers exposed by erosion in the north polar region. The light-toned patches are remnants of water...
in the good old summertimefrost free