Well I disagree to some extant with that, but the only thing I am relying on cosmology for is to establish the universe is finite.
But that is far from established.
Moreover, there is even speculation about which kind of "infinite" the universe could be.
Is the observable universe infinite in size?
Is it infinite continuously or in discrete increments?
Is it one of infinitely many universes?
Is this collection of an infinite number of infinite universes a "universe" itself?
Too much is unknown & perhaps even unknowable to say what the fundamental nature of the universe is.
No one has conclusively established any such thing.Philosophy and reality is what illuminates the rest. The big contention within this argument has been the steady state or Eternal universe versus the finite universe because everybody knows things that begin to exist have a cause. Finally the issue is getting close to being conclusively established as a finite nature to the universe. The rest is simple deduction except for the final step and it is perfectly reasonable itself.
If our observable universe is "finite" in some sense, then perhaps it's still just the result of
interaction of a couple branes, which could be infinite in size & number. No one knows.
http://physics.about.com/od/physicsatod/g/brane.htm
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