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]
from http://planetary.s3.amazonaws.com/assets/images/universe/20131105_2002_UX25_hst.png HST/Brown {{PD-NASA}} Hubble Space Telescope image of [[(55637) 2002 UX25]]
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