That is something I need to do too... Never studied that part, although I've read some mind boggling descriptions! The cosmology as in planets and other solar systems, I mean.

As for the realms that is kinda more practical and not too hard to imagine. An interesting thing is that I've seen texts describing shared karmic visions within realms, like humans having very different experiences from each others in groups.

That is certainly something that I'm literally living here btw, something in me just feels home...