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]
The original description page was here. All following user names refer to en.wikipedia.
2012-01-24 20:39 Gildir 300×242× (28503 bytes) Astronaut Michael López-Alegría conducting spacewalk during International Space Station Expedition 14. From http://www.nasa.gov/mission_pages/station/expeditions/expedition15/journal_sunita_williams_13.html. NASA photo ISS014e14537 in public domain.
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