1) GReat Images in NASA (GRIN): http://grin.hq.nasa.gov/
This site has been moved and renamed “NASA on the Commons”: https://www.flickr.com/photos/nasacommons
2) Terms and Conditions: https://www.flickr.com/commons/usage/
3) Collection summary according to the website:
The Great Images in NASA (GRIN) system provides a database of photos documenting NASA. Photos include: aircraft structures, aircraft design, aircraft models, wind tunnel tests, materials research, space programs, astronaut training, robotic planetary exploration and images taken by NASA spacecraft such as the Hubble Space Telescope and Mars Global Surveyor. GRIN contains many, but not all of the most popular images from NASA’s history. It also contains important historical images that you may not have seen before. We established GRIN to help journalists, publishers, educators, authors and the general public find high-quality historical photos. Photos were selected both for their historical importance and their visual impact. Having been moved to Flickr (owned by Yahoo), over 2,500 images are supported copyright free with the following conditions:
- NASA materials may not be used to state or imply the endorsement by NASA or by any NASA employee of a commercial product, service or activity, or used in any other manner that might mislead.
- NASA should be acknowledged as the source of its material.
- It is unlawful to falsely claim copyright or other rights in NASA material.
- NASA shall in no way be liable for any costs, expenses, claims or demands arising out of use of NASA’s cassettes and photographs by a recipient’s distributees.
- NASA personnel are not authorized to sign indemnity or hold harmless statements, release from copyright infringement, or documents granting exclusive use rights.
4) This is a sharing service so it is CC. The photo linked as the example also says NASA Public Domain. However certain photos are labeled “Some rights reserved” which takes you to: https://creativecommons.org/licenses/by/2.0/
Safety level: Safe