On Earth, a fast runner takes a few hours to complete a marathon. On Mars, it takes about 11 years. NASA's Opportunity rover crossed the finish line of the first "Martian Marathon" in 2015.
FULL STORY: http://science.nasa.gov/science-news/science-at-nasa/2015/15may_marathon/
VIDEO: https://www.youtube.com/watch?v=9gN_cmK9TUc&feature=youtu.be
