HiRISE: Corduroy dunes

tumblr_p9lpuchq571rlz4gso1_1280Corduroy dunes. The permanent polar cap of Mars is encircled by sand dunes and looking like pulled threads, these dunes march across a fabric of patterned ground. At this time of the Martian year they are free of the seasonal dry ice that forms a temporary cover every winter.

Beautiful Mars series. [More at links]

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