Constraints on the past atmospheric pressure of Mars can be obtained if small ancient craters are located. Earlier Context Camera and HiRISE images show large, ancient sedimentary impact craters exist at this site near Nili Fossae. The hypothesis: small craters exist too, meaning the atmosphere was thin at the time of sedimentation.

ID: ESP_057018_2015
date: 25 September 2018
altitude: 278 km

https://uahirise.org/hipod/ESP_057018_2015
NASA/JPL-Caltech/UArizona
#Mars #science #NASA