Dogmafood writes:
No - it is a reasonable representation. Arbitrarily pick any spatial coordinate on the right hand side of the diagram as of 'special interest'. Now move to the left, (keeping the same spatial coordinates but going backwards in time). Eventually you'll arrive at the big bang. Now pick another spot and do the same.
Now look at the big bang. Point to a single spatial coordinate that exists that is not at the big bang at the time of the big bang.
You can't.
Why? Because the big bang happened every'where'
I am fairly certain that I understand the 4 dimensions x y z and t.
It seems to me that you are saying that all of the galaxies in the universe are not moving apart but that there is an increasing amount of space between them. That doesnt make sense to me. Nor do I see how that negates the possibility of a centre. All the stuff that makes up the earth is not where it was 13.5 billion yrs ago. Something has moved.
Look at this video. When I imagine the BB I see something like this only shaped as a sphere.
Pause the video at the 5 second mark. Pick a speck on the right hand side of the screen in the middle of the band. Thats us. When we look around everything looks the same. How do we know that we are seeing all the way to the left side of the screen/disk/universe and not just 13.5 billion light yrs worth of galaxies in a globe surrounding us locally? Like a small bubble on the right side of the screen
The universe does not have a spatial center. What this means is that if you travel in one direction long enough you will eventually end back at your starting point. The universe essentially loops back on itself in all directions (this is assuming a finite universe of course). How can there be a center in such a system?
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