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

I’m a little late, but I think I can add a good analogy as to how space can expand when it is infinite and there’s nothing outside of it. Imagine a number line. You’re sitting at 1, and I’m sitting at 2. Now, we “expand” our number line by multiplying every number by 2. So you’re now sitting at 2, and I’m sitting at 4. The distance between us has increased, but we haven’t “moved.” Space itself is expanding beneath us!

But as to what space is expanding “into” it’s expanding into itself. Where did 5 go? It expanded to 10. Where did 100 go to? It went to 200. Where did 9,825,651,057,241 go to? Well, you get the idea. Because there’s no limit to infinity, you never “run out” of space to expand “into” and there’s no edge that needs to push some boundry. Where things were, well, they’re farther apart now.