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]
This is a derivative work (cropping) of a NASA photo of Mae Jemison that was produced by the US government and as such is in the public domain. The photo comes from a NASA web site at: http://images.jsc.nasa.gov/luceneweb/fullimage.jsp?searchpage=true&ke
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Photo de l'astronaute Mae Jemison travaillant dans le module Spacelab-J.