Shoulder Motor Balks on Opportunity Rover's Robotic Arm

A small motor in the robotic arm of NASA's Mars Exploration Rover Opportunity that began stalling occasionally more than two years ago has become more troublesome recently.

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<p><a href="http://www.physorg.com/news128268289.html">Shoulder Motor Balks on Opportunity Rover's Robotic Arm</a></p> <p>A small motor in the robotic arm of NASA's Mars Exploration Rover Opportunity that began stalling occasionally more than two years ago has become more troublesome recently.</p>