<p>Twin Craters in Meridiani Planum — This image is an example of the principle of superposition: figuring out what happened first by looking at how features interact with each other. 
</p><p>NASA/JPL/University of Arizona (273 km above the surface, less than 5 km across)
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<a rel="nofollow" class="external text" href="https://www.flickr.com/people/71688597@N05">UAHiRISE (NASA)</a>
2018-04-27 12:33
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