If the universe is always expanding, that means that there are places that the universe hasn’t reached yet. What is there before the universe gets there.

Question

I just can’t fathom what’s on the other side of the universe, and would love if you guys could help!

In: Physics

Answer 1

The best metaphor for this is to imagine the universe is 2D, not 3D, so it’s basically on a plane, like stars are painted on a sheet of paper. Now imagine it’s not a sheet of paper but the rubber surface of a ballon. Now imagine the ballon is inflating. More and more space (the surface) is created, it is expanding, but it’s not like it is expanding “over” empty space: the space itself is expanding.

(This metaphor creates some misunderstanding as well, but works well for your question. Here is where it fails: it leads you to think you need some “3D” space outside/inside that 2D “universe”; you don’t actually need that to explain our universe).