Like space? Who doesn’t! The last great mystery, not counting the depths of the ocean which is a lot like space but wet. Anyway, NASA’s media archives are free for you to check out and enjoy all you want through their media page.
The library includes still images, videos and audio all of which has been made available to the public to check out, learn from, or just enjoy. It’s a mix of all things space. So not just cool galaxies but also spacecraft in the midst of being built, finished, and those that pilot them.
The images are free to use for noncommercial purposes. So schools, students, news outlets, etc can go ahead and make use of them. If you want to use them in for profit project, contact the copyright holder for permissions. Otherwise, enjoy some space goodness!