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NASA / JPL / SCIENCE PHOTO LIBRARY NASA / JPL / SCIENCE PHOTO LIBRARY
Spirit analysing soil on Mars. Mars Exploration Rover Spirit using its robotic arm (instrument deployment device, centre left) to examine freshly-exposed soil in the bottom of a trench. The rover dug the trench with its left front wheel (lower left). The arm supports several scientific tools (centre), including a microscopic imager and spectrometers to analyse the soil composition. This picture was taken on 21 February 2004 by Spirit's hazard-avoidance camera.
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