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]
(NASA satellite image of Sydney, Australia, that I cropped and modified to show borders of Summer Hill; Original NASA image number: PIA03498 {{PD-USGov-NASA}})
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