Is space infinite?

[JDBar]

It depends on what you define as the edge of the universe. I'd like to define it as "emptiness" where neither matter nor light has existed. Since light from the universe is moving outward forever, then that would mean the universe is constantly growing. In order for it to grow, there must be space to grow right? But then you get stuck on the definition of "space". I mean, who's to say that the universe is merely limited to three dimensional space? There's the possibility that there IS indeed an edge of space that could potentially be imperceptible to us without some rigorous, maybe impossible testing. Take for example, the mobius strip:



Imagine you were a 2-dimensional being on the surface of the mobius strip. You could walk forward along the surface as long as you'd like, but you'd always end up back where you started. It'd seem as if there's some invisible magical force bringing you back to where you started.

Now pop back out as a 3-dimensional being, and you can see that the 2-dimensional strip is curved in such a way to make it seem as if it goes on forever. What if this was the case for our 3-dimensional universe? We likely wouldn't know, especially in our lifetimes. I believe the 4D version of the mobius strip is the Klein bottle.