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.

ID: ESP_054161_2540
date: 14 February 2018
altitude: 317 km

https://uahirise.org/hipod/ESP_054161_2540
NASA/JPL-Caltech/UArizona
#Mars #science #NASA