HiPOD: 31 August 2019
Raindrops of Sand in Copernicus Crater

Raindrops of Sand in Copernicus Crater
The dark features here look like raindrops, but are actually sand dunes rich in the mineral olivine. These types of dunes are rare on Earth as olivine rapidly weathers to clays in a wet environment.  (Read the full caption.)

ID: ESP_031221_1315
date: 25 March 2013
altitude: 253 km
Observation details page

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NASA/JPL/University of Arizona
Black & white is less than 5 km across; enhanced color is less than 1 km