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]
http://eoimages.gsfc.nasa.gov/images/imagerecords/77000/77197/ISS030-E-059398.jpg http://earthobservatory.nasa.gov/IOTD/view.php?id=77197 Annotated view of Lake Fitri {{PD=NASA}}