<p>Cracks in a Crater's Ice – 
Sometimes ice flows slumps down a crater's walls into the center and acquires concentric wrinkles as a result.
</p><p>NASA/JPL/University of Arizona. Cracks in a Crater's Ice
</p>
Sometimes ice flows slumps down a crater's walls into the center and acquires concentric wrinkles as a result.)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2016-12-05 10:51
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/uahirise-mars/31343739612/">ESP_047247_1150</a>