@anartist what don’t YOU understand????
I have a good understanding of the issues. A part of my job is the purchase of images – I don’t pay for anything that I don’t have to. Nothing those links supports your contention that Government owned images are not copyrighted. Those links allow for specific use as long as it is for private or educational purposes.
Did you read this bit?
“Strict legal regulations govern NASA policy regarding advertising requests. Companies interested in producing NASA-related advertisements must notify NASA’s Multimedia Division in writing by sending e-mail to Bert Ulrich (bert.ulrich@nasa.gov). Requests should describe the intended use of NASA imagery in the ads. If possible, layouts or storyboards of the advertisement should be included. When all legal requirements have been met, NASA will send the advertiser an approval letter. A general overview of NASA policy follows:”
NOTHING there allows using an image for a derivative work. Even so, this is just NASA, not whole of government. You clearly have no idea about copyright law.