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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, 2007archive 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
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]