<p>Most gullies in the southern mid-latitudes are on south-facing slopes, which are the coldest and have the most frost in the winter. However, some occur on other slopes.
</p><p>This image shows large gullies on both the pole- and equator-facing slopes. An important puzzle in Mars science is whether or not all of these gullies form in the same geologic eras and by the same processes. 
</p><p>NASA/JPL/University of Arizona
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<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2019-03-14 14:30
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/46498456905/">Complex Gullies in a Crater</a>