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]
https://mars.nasa.gov/mer/gallery/all/1/n/4959/1N568428036EFFD0J8P1826R0M1.HTML Navigation Camera Sol 4959 of the MER-B Opportunity rover on Mars from https://mars.nasa.gov/mer/gallery/all/opportunity_n4959.html {{PD-NASA}}
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