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Our universe may have a 'boundary' (for the want of a better word), in that matter resulting from the Big Bang is continuing to expand and therefore there must be a point beyond which it has not reached yet. But beyond that 'boundary' there is empty space, into which it will expand, and that empty space is boundless, infinite.
..... There is nothing beyond our universe.....
Quote from: QuantumClue on 15/12/2010 08:16:30..... There is nothing beyond our universe..... Precisely my point.
There is nothing beyond our universe.
Assuming acceptance of the Big Bang, which in our present state of knowledge seems a reasonable thing to do, our Universe had a beginning; it is therefore finite (in our F of R), although it may be unbounded.
Quote from: QCThere is nothing beyond our universe.Your apparent certainty suggests one of three things:1. You have been there.2. You are guessing.3. you have been reading Donald Hamilton.Come clean. 
Quote from: Don_1 on 15/12/2010 10:48:41Quote from: QuantumClue on 15/12/2010 08:16:30..... There is nothing beyond our universe..... Precisely my point.Then you would seem to be implying that speaking about space, we are referring to something which is nothing... This would be incorrect. Space in our terminology is in fact something, empty space is not actually void and empty of anything. It's a bubbling couldron of virtual particles. Outside the universe, there is no word which can describe this ''nothingness'' - it simply has no description, a non-reality. It is neither space, nor time - energy or even matter. No volume, nothing.
Agreed. The 'empty space' between the stars planets etc in our universe is not exactly 'empty' at all, but beyond our universe is nothing. The problem, as I stated before, is that our conception of 'nothing' may not quite fit the true meaning of the word.
The problem, as I stated before, is that our conception of 'nothing' may not quite fit the true meaning of the word.
If more than one universe exists, and if nothing exists outside each universe, can we say anything about the relative positions of the universes?
No because universes are self-contained.
QuoteNo because universes are self-contained.I guess that means you don't agree with David Deutsch's claim to be able to provide "proof" of interaction between universes.
In fact, even saying "outside the universe" is problematic, since to be outside something implies that there is geometry outside of the universe!