Flickr Community guidelines | Flickr
Public Domain images from NASA with no copyright restrictions. These are grouped into various galleries on Flickr that can be freely used by anyone for their projects. The Flickr guidelines are for the entire website but are helpful knowledge for any use of images on the web. NASA has several galleries elsewhere and due to it being a government agency, these are all public domain and no copyright. The top image is special to me as I have seen the vacuum chamber in person as my brother in law has worked on this chamber during his career at NASA.
