A well-defined dust devil crosses in front of the camera in this animation of a series of images acquired by NASA's Mars Rover Spirit in May, 2005. (NASA/JPL-Caltech/Cornell/USGS)
Several dust devils cross a plain in this animation of a series of images acquired by NASA's Mars Rover Spirit in May, 2005. (NASA/JPL-Caltech/Cornell/USGS)
Source: The Boston Globe
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