this post was submitted on 25 Sep 2024
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There is no outside, by definition.
We also don't know for sure wether it's infinite, since we can only see the "observable universe"
If we are considering "the universe" to mean the spacetime that we exist in, there could be an "outside," but we just don't know, and there's no indication of such an outside, or anything about what it would be like.
By way of infinite spacetime, yes, there is only a part of spacetime that we can observe, because the farthest part is moving away from us faster than the speed of light. I seem to recall there having been some estimations of how large all of spacetime is, observable and unobservable, and that it has a finite size.
That said, there does not appear to be a limit to the size of spacetime. Based on what is currently known, spacetime is expanding, the expansion is accelerating, and there is no limit to the expansion.
Honest question: if “nothing is faster than the speed of light,” then how could the universe be expanding faster than the fastest thing?
Wait until you hear about relativity.
And also we don't know that C is the limit entirely, but it is so far. Also, we don't know if there are more dimensions in our reality or not because we cannot observe them. And no, I don't have much of a better answer.
Basically, we still know we don't know a lot, and we probably don't know a ton of what we don't know that we don't know. Also magic.