NASA Images: Set 2
Images grabbed from Flickr using the "no known restrictions" search parameter: https://www.flickr.com/search/?text=NASA%27s%20Marshall%20Space%20Flight...
These might make good load screens, or title/menu backgrounds. I tried to submit as somebody else's work but don't see anywhere to name the authors?
For all images: https://www.flickr.com/commons/usage/
NASA's media use policy: https://www.nasa.gov/multimedia/guidelines/index.html