FILE - In this Thursday, Aug. 2, 2012 file photo, engineers work on a model of the Mars rover Curiosity at the Spacecraft Assembly Facility at NASA’s
FILE - In this Thursday, Aug. 2, 2012 file photo, engineers work on a model of the Mars rover Curiosity at the Spacecraft Assembly Facility at NASA's Jet Propulsion Laboratory in Pasadena, Calif. (AP Photo/Damian Dovarganes) (Damian Dovarganes/AP)