The arm of NASA's Mars Exploration Rover Opportunity is seen extended toward a light-toned rock, "Tisdale 2", during the 2,695th Martian day, or "sol", of the rover's work on Mars, in this picture taken by the rover's front hazard-avoidance camera on August 23, 2011. The rock, "Tisdale 2", is about 12 inches (30 cm) tall. The rover used two instruments on the robotic arm, the microscopic imager and the alpha particle X-ray spectrometer, to examine Tisdale 2. In this image, the turret at the end of the arm is positioned so that the microscopic imager is facing the rock. REUTERS/NASA/JPL-Caltech/Handout less
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