Rovers to Speed Across Mars as Support Staff Shrinks

With NASA’s Mars rover Spirit nearing the end of its primary mission profile and its twin, Opportunity, more than halfway through its own, mission planners preparing to give the two robots a longer leash while scaling back the amount of people on the project. Mission managers are looking ahead to an extended mission for both Spirit and Opportunity, which will kick in once the robots complete their first 90 days — or sols on Mars.