File:Mars dust opacities MER-B Sol 1205 to 1235.jpg

a time-lapse composite of the Martian horizon during a dust storm taken in July 2007 Sols 1205 (0.94), 1220 (2.9), 1225 (4.1), 1233 (3.8), 1235 (4.7) by NASA's Mars Exploration Rover Opportunity at Victoria crater (numbers in parentheses are Tau opacities).
From JPL linked from NASA Mars Rovers Braving Severe Dust Storms July 20, 2007 archive copy at the Wayback Machine. Caption: a time-lapse composite where each horizon-survey image has been compressed horizontally (but not vertically) to emphasize the sky where Opportunity is. Image credit: NASA/JPL-Caltech/Cornell

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