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]
(Redding, California - April 1994 image description [http://eol.jsc.nasa.gov/sseop/EFS/photoinfo.pl?PHOTO=STS059-213-7 here] The source for this image file is ftp://eol.jsc.nasa.gov/EFS_highres_STS059_STS059-213-7.JPG which is a 10890 KB. It was then rot)