pallidin said:
- The "backtrack" itself would be the outside reference point.
I understand what you are saying, but this "backtrack" reference point is arbitrary, and within this 'outside' reference all galaxies are still moving away from each other from every perspective.
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- Not all galaxies are moving away from each other. Some are actually in collision. Check it out.
Yes, but that is just a local phenomenon. Galaxies in collision and clusters of galaxies are moving toward each other, but If we view the universe as a whole, all galaxies and clusters of galaxies are overall moving away from each other. Eventually these clustering galaxies will unite, but these united galaxies are still part of the expansion of the universe, and will eventually be separated from all other galaxies.
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A Universe expansion requires, by default, a point of origin of the expansion; else "expansion" is impossible by definition.
The way to view this is, the expansion of the universe is uniform from from every location in the universe. If there were a central location from which we would see everything moving away from this special, specific location, then this point would be the center of the universe, the center of expansion.
But we never find this special location.
From each and every location we view the universe around us, everything is moving away from us. Therefore, there is no preferred location of expansion. The universe is expanding uniformly from every location we view it. Everywhere seems to be the center from which expansion is taking place, so there cannot be a central location that is special. This is the critical fact to keep in mind.
As I said before, no matter how small we contract the universe, we will never observe a center, we will continue to see the universe as we see it now, a general uniform expansion from every point in space. No specific point being different or special.