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No copyright is asserted for these images. If a recognizable person appears in an imageĦA use for commercial purposes may infringe a right of privacy or publicity. These images may not be used to state or imply the endorsement by NASA or by any NASA employee of a commercial productĦA process or serviceĦA or used in any other manner that might mislead. AccordinglyĦA it is requested that if these images are used in advertising and other commercial promotionĦA layout and copy be submitted to NASA prior to release.Here's another NASA statement:National Aeronautics and Space AdministrationĦA Houston TX 77058
All of the images presented on NSSDC's Photo Gallery are in the public domain. As suchĦA they may be used for any purpose. NSSDC does askĦA howeverĦA that you acknowledge NSSDC as the supplier of the data. In additionĦA where the source of the image (by project or as a specific person) is credited in the textĦA you should also acknowledge thatĦA too.Or see NASA's copyright guidelines page.
HST images are generally OK for non-commercial use. But see their copyright page.