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Mars rover reaches crater after 3-year trek

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

Surviving NASA rover nears rim of Martian crater

Months after the death of the Mars rover Spirit, its surviving twin is poised to reach the rim of a vast crater to begin a fresh round of exploration. Full story

Spirit Rover Remains Silent as Mars Mission Begins 8th Year

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

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John Callas
John Callas

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.