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Mars Rovers Get New Manager During Challenging Period NASA's long-lived Mars rovers demand lots of care as they age and the Martian winter approaches. Dr. John Callas, newly named project manager for NASA's Mars Exploration Rover mission, is coordinating the work to meet these challenges. He is a scientist at NASA's Jet Propulsion Laboratory in Pasadena, Calif. He was named project manager after earlier roles as science manager and deputy project manager for the Spirit and Opportunity rovers.
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