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Originally posted by Shamatt
We are told nothing can travel faster than the speed of light. Most of us would agree with that I am sure. So we must asume that the universe is not expanding faster than the speed of light.
We are told that the universe started with the big bang. So my first problem is this - how can anything that is infinate have a starting point?
"If the universe is expanding, what is it expanding in to?"
it can't be expanding into anything because there is nothing there - no time, no space = no spacetime, nothing.
We are told nothing can travel faster than the speed of light.
Most of us would agree with that I am sure.
So we must asume that the universe is not expanding faster than the speed of light.
So let us take an arbitary mesurement of time, lets say 1 earth year. I know, it is a long time untill the earth comes into existence, but lets just use that. And lets look at the state of the unverse 1 earth year after the big bang. Lets say the speed of expansion is the same as the speed of light: Well, we must assume it has expanded by 1 light year in every direction, and is therefore 2 light years accross. And a hundred earth years after the big bang, it would be 200 light years accross. And so on.
So, no infinite universe.
Black holes can't have infinite mass, or gravity.
Careful - your initial claim was that the universe was not infinite, not something within it. I agree that nothing in the universe is infinite, but the universe itself is.
Which backs up my theory that nothing in the universe can be infinite if the universe itself isn't!