[How does one explain space while high.]

You have stars, right? At night? Each of those stars is something massive, but very far away. Different suns, different planets... It all exists in space, just like this planet. And galaxies are, uh, kind of like space... Countries. But mostly just. Geographically? A galaxy is a collection of stars and planets that are loosely related by gravitational pull, um... An invisible connection that keeps them close.