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== *[https://oea.larc.nasa.gov/trailblazer/SP-4216/chapter4/ch4.html A Technology Eclipsed: The Microwave Landing System and the Dawn of GPS] [https://oea.larc.nasa.gov/trailblazer/SP-4216/photos/p41b.JPG] ==Caption== The NASA 737 research aircraft
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