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]
from http://eoimages.gsfc.nasa.gov/images/imagerecords/82000/82937/ISS038-E-020918_front.jpg {{PD-NASA}} Alternative with more annotations http://earthobservatory.nasa.gov/IOTD/view.php?id=82937
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