In and Out

This frame from an animation links two images taken by the front hazard avoidance camera on the Mars Exploration Rover Spirit. The rover is stowing and unstowing its robotic arm, or instrument deployment device. The device is designed to hold and maneuver the various instruments on board that will help scientists get up-close and personal with martian rocks and soil.

An animation is available at http://photojournal.jpl.nasa.gov/catalog/PIA05045