|Three thousand light-years away, the Cat's Eye Nebula, a dying star throws off shells of glowing gas. This image from the Hubble Space Telescope reveals the nebula to be one of the most complex planetary nebulae known.|
Image credit: NASA, J. P. Harrington (U. Maryland) and K. J. Borkowski (NCSU)
NASA still images, audio files and video generally are not copyrighted. If the NASA material is to be used for commercial purposes, especially including advertisements, it must not explicitly or implicitly convey NASA's endorsement of commercial goods or services.
If a NASA image includes an identifiable person, using the image for commercial purposes may infringe that person's right of privacy or publicity, and permission should be obtained from the person.
Generally speaking, works created by U.S. Government employees are not eligible for copyright protection in the United States. See Circular 1 "COPYRIGHT BASICS" PDF from the U.S. Copyright Office.
Let this small sampling be a guide to better quality, more plentiful, public domain, royalty free, copyright free, high resolution, images, stock photos, jpeg, jpg, clip art, clipart, clip-art.