"Martian dust appears on the surface of a penny that was brought along with the Curiosity rover and photographed by the <a href=""http://mars.nasa.gov/msl/mission/instruments/cameras/mahli/"" target=""_blank"">Mars Hand Lens Imager</a> on October 2. The image of the 1909 coin is at the highest resolution possible for the high-powered camera: 14 micrometers per pixel (a micrometer is about .000039 inches)."
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