This artist's concept features NASA's Mars Science Laboratory Curiosity rover, a mobile robot for investigating Mars' past or present ability to sustain microbial life. In this picture, the rover examines a rock on Mars with a set of tools at the end of the rover's arm, which extends about 7 feet (2 meters). Two instruments on the arm can study rocks up close. A drill can collect sample material from inside of rocks and a scoop can pick up samples of soil. The arm can sieve the samples and deliver fine powder to instruments inside the rover for thorough analysis. The mast, or rover's head, rises to about 6.9 feet (2.1 meters) above ground level. This mast supports two remote-sensing science instruments: the Mast Camera, or eyes, for stereo color viewing of surrounding terrain and material collected by the arm; and, the Chemistry and Camera instrument, which uses
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