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No copyright is asserted for these images. If a recognizable person appears in an image, 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 product, process or service, or used in any other manner that might mislead. Accordingly, it is requested that if these images are used in advertising and other commercial promotion, layout and copy be submitted to NASA prior to release.Here's another NASA statement:
National Aeronautics and Space Administration, Houston TX 77058
All of the images presented on NSSDC's Photo Gallery are in the public domain. As such, they may be used for any purpose. NSSDC does ask, however, that you acknowledge NSSDC as the supplier of the data. In addition, where the source of the image (by project or as a specific person) is credited in the text, you should also acknowledge that, too.Or see NASA's copyright guidelines page.
HST images are generally OK for non-commercial use. But see their copyright page.