The NASA rover Opportunity has broke the record for distance traveled by a rover, as it has officially traveled 26 miles on the surface of mars, which is the exact length of a Marathon. What makes this feat impressive, is that Opportunity, has been on this pace since 2004, meaning it is NASA's longest operational rover. The previous record holder was the soviet moon rover, Lunokhod-2, which had traveled about 25 miles and had held the record since 1973.
Before it set the record for distance, Opportunity had provided evidence of a presence of water on Mars shortly after it began traveling Mars's surface in 2004, which begs one to wonder what Opportunity and future rovers will provide us with.
http://www.cnn.com/2015/03/25/world/opportunity-rover-marathon-milestone/
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