cavediver writes:
Think of the balloon analogy. Every point on the balloon skin thinks that every other point is moving away radially as the balloon inflates, so concludes that it is the centre of expansion of the balloon. But we can see from our vantage that there is no centre on the balloon surface.
The surface of a baloon is two dimensional. Our universe is three dimensional. The balloon does indeed have a center, but obviously it is not on the surface.
As we look out across the galaxy we find the far away galaxies are indeed moving faster the closer galaxies. The galaxies are not moving at the same speed.
cavediver writes:
Then every point is the centre. Every point in space was "born" in the big bang. In a finite closed big bang scenario, all of those points were coincident.
What has been done to prove that every point in space was "born" in the big bang rather than the big bang occurring at a point in space. I certainly do not have knowledge but I suspect we have found neither the the edge of the universe nor evidence that there is no edge.
Going back to the baloon analogy, every molecule of air in the baloon "thinks" that every other molecules is moving away. This does seem to be true. However, the molecule at the center will find symetrical movement in all directions while I suspect that the ones near the edge will not.
Hmm, I don't know how I would approach this but it seems like a good module to simulate with a computer. But continuing to think, it can probably be calculated by hand much easier. Has anyone done that?
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