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While unpacking itself on the Martian surface, Spirit took a closeup of one of its wheels.
Here's one of the last photos taken by Spirit in 2010 as it was about to endure its fourth Martian winter. You can see it's stuck and NASA scientists were unable to move its solar panels directly toward the sun to sufficiently recharge the batteries. It went into a standby mode for the winter but was never heard from again.
The rovers are leaving their mark on Mars. This track was taken on April 1, 2011by the other rover Opportunity that's still working despite signs of wear and tear. You can see it also has a damaged wheel. There's about 40 inches between the tracks.