Gullies on Mars form during the winter, fluidized by carbon dioxide frost, so we monitor these sites for activity throughout the year.
This mid-winter scene is almost completely frosted over the pole-facing slope within the shadow.
ID:
ESP_062894_1435date: 27 December 2019
altitude: 252 km
https://uahirise.org/hipod/ESP_062894_1435
NASA/JPL-Caltech/University of Arizona
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