
NASA's Mars rover Opportunity looks back at its tracks in the Martian soil on Sol 2321. Originally planned to operate for 90 days, after landing on Mars in January of 2004, Opportunity continues to function well over 2,500 days later, and has now driven more than 26 km (16 mi) across the planet's surface, sending back data and images nearly every day. (NASA/JPL) #
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