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The left eye of the Mast Camera (Mastcam) on NASA's Mars rover Curiosity took this image of the MAHLI camera on the rover's arm, on Mars, on September 5, 2012. The image shows that MAHLI has a thin film or coating of Martian dust on it. This dust accumulated during Curiosity's final descent to the Martian surface, as the Mars Science Laboratory spacecraft's descent stage (or sky crane) engines were disrupting the surface nearby. The reddish circle near the center of the Mastcam Sol 30 image is the window of MAHLI's dust cover, with a diameter a little less than a soda can's diameter. The mechanism at the right in this image is Curiosity's dust removal tool, a motorized wire brush. (Photo by NASA/JPL-Caltech/MSSS)
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