Quote:
Originally Posted by MrB
Blah, thats like saying a falling tree doesn't make sound because no one is around to hear it.
Forget what was, or wasn't, there before.
Once there were no landmarks on earth, and no possitioning relative to them. Relative possitioning is done now, but using you're logic that shouldn't be possible, because those landmarks once weren't there and neither was our concept of space and distance etc.
There is matter now, and we should be able to find the point of origin of the expanding bubble.
We now have a reference, all the observable galaxies, so where is the origin(referenced to observable/mappable galaxies) that the red-shifted galaxies are moving away from?
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Your line of reasoning contradicts the Cosmological principle. If you use red shift to calculate the origin you will find the BB to have occurred in your own backyard.
Red shifted galaxies are moving away from you, or from an observer from any point in the Universe. Doppler red shift is not an absolute parameter but is relative to the position of the observer.
At the scale of the universe, galaxies are essentially evenly distributed. This is a direct consequence of space time expansion which makes the universe homogenic and isotropic.
If you want to use a bubble analogy think of the universe as the surface of the bubble rather than its volume. You will find that every point on the surface is moving away from every other point as the bubble expands. There is no specific origin.
Regards
Steven