Comment by embedding-shape

Generally yeah, but NASA seems to explicitly allow hot linking?

> NASA images may be used as graphic “hot links” to NASA websites, provided they are used within the guidelines above. https://www.nasa.gov/nasa-brand-center/

As long as you don't "explicitly or implicitly convey NASA’s endorsement of commercial goods or services" and "NASA should be acknowledged as the source of the material" they seem fine with it.

Seems this project does miss that last part though, I don't see any mention of where the images are from.