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]
{{Information | Description=Two computer models showing the amount of methane found at the Earth's surface and in the stratosphere. | Source=http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=16827 | Date=not specified | Author=GMAO C