NASA's Opportunity rover has reached the rim of a 14-mile-wide crater after nearly three years of traveling across desolate Martian plains, scientists reported Wednesday.Full story
NASA's mired Spirit rover remains in a nine-month slumber as it begins the eighth year of its Mars mission, but its twin, Opportunity, keeps chugging along. Full story
John Callas, of NASA's Jet Propulsion Laboratory, is manager of the Mars Exploration Rover project. MER involves the Mars rovers Spirit and Opportunity, which have been chugging around the Red Planet since 2004.