More than 8 years after landing on the Red Planet, Mars rover Opportunity is still running. Indeed, mission planners say the tireless robot is poised to complete a full marathon--the first ever long-distance race on an alien planet.
FULL STORY: http://science.nasa.gov/science-news/science-at-nasa/2012/18jul_martianmarathon/
VIDEO: http://www.youtube.com/watch?v=DC-rvKjBHfE
