>> Finite? Maybe.
>> Must have a border? Maybe not. Or it may just be that there is no way to
>> perceive it, even if you are almost "touching" it...
>
>  If there is a border, it's probably impossible for us to ever reach it.
> There's this thing called "cosmological horizon" which, if true, means
> that there's just no way, even theoretical, for as to "see" it in any way.
>
>  But that doesn't mean there is no border.

Einstein postulated a finite universe as part of his formulation of
relativity. He said that, since space-time can curve, eventually if
you travel in a straight line far enough you will come back to your
starting point. This would mean that there is no well defined edge.

Modern astronomers can find no evidence of such a large scale
warping of space-time. This is part of why the theories of parallel
universes are in vogue, if the universe is infinite, then if you
travel in a straight line far enough you might reach a region
that is very similar to earth, but isn't quite. It would be "parallel".

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