Many valleys occur all over Mars that reveal an extensive ancient history of liquid water erosion. While these valley systems are typically now covered with fine soils and sand dunes, the overall scale and shape of the valleys reveals much about the ancient climate.

ID: ESP_054899_2160
date: 13 April 2018
altitude: 295 km

https://uahirise.org/hipod/ESP_054899_2160
NASA/JPL-Caltech/UArizona
#Mars #science #NASA