John Callas, Mars Exploration Rovers project manager, with a one-tenth Rover scale model, speaks at a news conference marking the 10th anniversary of the NASA Mars Opportunity rover mission, at a news... more 
John Callas, Mars Exploration Rovers project manager, with a one-tenth Rover scale model, speaks at a news conference marking the 10th anniversary of the NASA Mars Opportunity rover mission, at a news conference at Jet Propulsion Laboratory in Pasadena, Calif., Thursday, Jan. 23, 2014. (AP Photo/Reed Saxon) less 
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Associated Press | Photo By Reed Saxon
Thu, Jan 23, 2014 6:32 PM EST