This image shows NASA's Mars Exploration Rover Opportunity's arm exploring the trench the rover dug with one of its wheels. The arm holds a suite of scientific instruments designed to examine rocks and soil for signs of past water on Mars.

This animation shows the Mars Exploration Rover Opportunity's arm exploring the trench the rover dug with one of its wheels. The arm, or instrument deployment device, holds a suite of scientific instruments designed to examine rocks and soil for signs of past water on Mars. The movie was made from images taken by the rover's hazard-avoidance camera.

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