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]
Source: http://science.nasa.gov/media/medialibrary/2003/12/22/29dec_magneticfield_resources/world-pr.gif This file is from NASA and thus lies in the public domain.
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