The NASA Commons at Flickr is a collection of photos from the NASA archives, most of which have no known copyright restrictions. Content created by NASA is the public domain because material created by the federal government is not subject to copyright. The NASA Commons includes freely downloadable images of astronauts, rockets, planets, space, and views of the Earth. The images can be used without permission in exhibits, for educational, and for informational purposes. NASA should be acknowledged as the source for the image.