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This video, taken by the Navigation Cameras, or Navcams, on the Mast of NASA's Curiosity Mars rover, shows the rover's robotic arm as it rotates to take a selfie. A camera at the end of the arm captured 86 individual images that were later stitched into a panorama.
The Navcams are black-and-white cameras generally used to help engineers plan Curiosity's movements.
More information about Curiosity is online at http://www.nasa.gov/msl and http://mars.jpl.nasa.gov/msl/.