<p>Aging with Impacts — Counting craters to determine age estimates of planetary surfaces has been used throughout the solar system.
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NASA/JPL/University of Arizona (<a rel="nofollow" class="external text" href="http://uahirise.org/ESP_049398_2180">uahirise.org/ESP_049398_2180</a>)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2017-04-20 16:20
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