Mars rover Opportunity studying new surroundings (AP)

This image provided Thursday Sept. 1, 2011 by NASA shows NASA's Mars Exploration Rover Opportunity using its camera to take this picture showing the rover's arm extended toward a light-toned rock, 'Tisdale 2,' during the 2,695th Martian day, Aug. 23, 2011. The solar-powered rover beamed back images of the horizon, soil and nearby rocks that are unlike any it has seen during its seven years roaming the Martian plains. (AP Photo/NASA)AP - The Mars rover Opportunity is snapping pictures like a tourist since arriving at its latest crater destination, much to the delight of scientists many millions of miles away.

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