Spirit, Opportunity Readied for New Duties

NASA’s Mars Exploration Rovers – Spirit and Opportunity – are entering new phases of work on the Red Planet. At its Gusev Crater site, Spirit has studied a flaky rock called Mimi. Scientists have found Mimi of particular interest as its layers are suggestive of a process that might have involved the action of water. Mimi looks very different from any rock that scientists have seen at the Gusev crater site so far.