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nasaimages.org

Great space images for your comps or projects. From their terms of use

The NASA imagery offered on NASAIMAGES.ORG is generally not copyrighted. You may use this NASA imagery for educational or informational purposes, including photo collections, textbooks, public exhibits and Internet Web pages (personal or otherwise). This general permission does not extend to any use of the NASA insignia logo (the blue “meatball” insignia), the retired NASA logotype (the red “worm” logo) and the NASA seal (the “NASA Properties”) whether or not used in conjunction with images obtained from NASAIMAGES.ORG. Notwithstanding the foregoing restriction, you may use the NASA name and the NASA initials only as indicators of the original source of the NASA imagery.

If the NASA images obtained from NASAIMAGES.ORG are used for commercial purposes (including advertisements or packaging), such use may not suggest, either explicitly or implicitly, that NASA endorses any commercial goods or services.