This is maybe a noob question, but I want to be 100% sure.

I've seen some stock videos which look like they are using the real photos of nebulas or galaxies (not impossible these images are top quality illustrations, but I would say some of them are definitely photos). I know there is at least one site with the space photos available for commercial use, which should technically be safe to use, but on the other hand I thought that our motion graphics have to be 100% ours.

So can we safely use the space photos for our motion graphics or is it better to stay on the safe side and do everything from scratch?