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]
(Pair of satellite images, taken before and after the Kolka-Karmadon ice rock slide. {{PD-USGov-NASA}} From http://earthobservatory.nasa.gov/Study/Kolka/Images/kolka_ast_comparison.jpg)
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