When the Mars rovers were deployed to the red planet in 2003, they were only expected to last three months. But here we are, five years later celebrating Spirit and Opportunity’s anniversary. During their adventure, what have the Rovers discovered? How much longer can we expect Spirit and Opportunity to be with us? Ray Arvidson, Deputy Principal Investigator on the Mars Exploration Rover Mission, joins us as we look back at the last five years and forward into the next.