NASA MAKES THEIR ENTIRE MEDIA LIBRARY PUBLICLY ACCESSIBLE AND COPYRIGHT FREE!
“No matter if you enjoy taking or just watching images of space, NASA has a treat for you. They have made their entire collection of images, sounds, and video available and publicly searchable online. It’s 140,000 photos and other resources available for you to see, or even download and use it any way you like.
You can type in the term you want to search for and browse through the database of stunning images of outer space. Additionally, there are also images of astronauts, rocket launches, events at NASA and other interesting stuff. What’s also interesting is that almost every image comes with the EXIF data, which could be useful for astrophotography enthusiasts.”(DIY Photography)