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]
Artist impression of Teegarden's star b.
Made from the exoplanet catalog at NASA, hue changed to green to make it more in line with it being the most earth-like exoplanet.
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