The pale rock in the upper center of this image, about the size of a human forearm, includes a target called "Esperance," which was inspected by NASA's Mars Exploration Rover Opportunity. This image ... more 
The pale rock in the upper center of this image, about the size of a human forearm, includes a target called "Esperance," which was inspected by NASA's Mars Exploration Rover Opportunity. This image is a composite of three exposures taken by Op less 
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SPACE.com | Photo By NASA/JPL-Caltech/Cornell/Arizona State Univ.
Fri, Jun 7, 2013 3:36 PM EDT