Mars photographed through the years

<div class="meta image-caption"><div class="origin-logo origin-image none"><span>none</span></div><span class="caption-text">This is a view of Mariner 4 in flight attitude on July 13, 1965. (Photo&#47;AP)</span></div>
NASA has been exploring Mars -- and sending back incredible images -- for 50 years. The latest big announcement, complete with photographic evidence, is that the red planet contains liquid water.

Take a look back at some other big moments in NASA's Mars exploration history in the gallery above.


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