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NASA’s Opportunity rover explores Spirit Mound after descending down Marathon Valley, and looks out across the floor of vast Endeavour crater. This photo mosaic was assembled from raw images taken on Sol 4505 (25 Sept 2016) and colorized. (A Sol is a Martian day.)

Credit: NASA/JPL/Cornell/ Ken Kremer/kenkremer.com/Marco Di Lorenzo

Opportunity was expected to last 90 Sols on Mars, but has so far been there 50 times longer than that. And there's more to come. Another mission extension is sending the rover to "an ancient gully where life giving liquid water almost certainly once flowed on our solar systems most Earth-like planet."