I think I get the gist, though I'm not sure we have...planets. Well. We might, there are certainly things up in the night sky and we call them stars, so they must be the same--I think? You have a sun, you have moons and that sort of thing?

[It wasn't as if they didn't have astrolabes on Hydaelyn, they were just rather different from the ones Peter likely had in mind--or his diagrams, for that matter.]

I come from Hydaelyn. We have earth, but it is just the ground--and aether, that is magic. Is your planet called Earth for that reason? Because it is a word for the ground you walk on? [Clever enough, in her mind. And simple, you wouldn't get lost, there.]

No air is a vacuum? I am not sure we've ever encountered anything like that--save underwater, but that's certainly not a vacuum, I shouldn't think...

It's nice to meet you as well, Peter! Please go on?