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Originally Posted by Zenir
This sounds somewhat questionable. So the universe is expanding, though there are no boundaries and there is nothing it is expanding into. I am assuming you are leaving out the elasticity of the balloon and explaining the universe as an equal amount of matter and energy expressed in a given area. Also how can we be sure of the nothingess beyond our universe and at that the confines of our universe. Is this predicted from creation theories or expansion and interaction of bodies of mass? Also are you attempting to define hyperbolic geometry?
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If the expanding universe is elastic, everyone remembers ether, then it has very odd "elastic" properties since studies show that the universe is not only expanding, but something is accelerating the galaxies further and further away from each other.
An we can be sure that whatever exists on the opposite side of our universe's light boundary, we will never see since we would have to go faster than light to ever reach it, which Einstein proved we can't do in normal space or with conventional travel.