I wonder whether 3D models & textures by NASA are public domain. Their GitHub repo implies so:
We offer these assets for your use, free and without copyright.
Or according to Wikipedia, speaking of "pictures":
Under United States copyright law, works created by the U.S. federal government or its agencies cannot be copyrighted. (This does not apply to works created by state or local governments.) Therefore, the NASA pictures are legally in the public domain.
I therefore assume they are, yet I would like to be certain. Are the contents of said repo available under the public domain, as the author of this issue assumes? How far is the "public domain" equal to WTFPL/CC0?
Update: after browsing the repo, I found the following
meta.json, which claims:
"license": "NASA Open Source Agreement Version 1.3" as well as
"description": "collection of 3D models, textures, and images from inside NASA". This is confusing me; is this license equal to public domain?