This image taken by the microscopic imager on NASA's Mars Exploration Rover Spirit shows the powdery soil of Mars in 3-D. 3D glasses are necessary to view this image.

This image taken by the microscopic imager on the Mars Exploration Rover Spirit shows the powdery soil of Mars in 3-D. It is the sharpest look yet at the surface of another planet. The microscopic imager is located on the rover's instrument deployment device, or "arm."

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