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:''' NASA
'''URL:''' [http://www.gutenberg.org/dirs/1/2/0/8/12082/12082-h/opportunity/op.htm http://www.gutenberg.org/dirs/1/2/0/8/12082/12082-h/opportunity/op.htm]
'''Description:''' Rock Abrasion Tool (RAT) on the Mars Rover Opportunity's Ins)
Captions
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