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I have just found time to get round to this interesting question because it opens the door to some details that many people seem to ignore. When we talk about the "size" of the universe we are always talking about the "size of the piece of the universe that we can see"because if the universe did end physically at the limit of our visibility and it was empty space beyond it would in effect be non uniform and this non uniformity could be detected similarly if our visible universe and nothing else was compressed to become very small it would have become a black hole long before it got down to the size of a peanut. So logically there must be a lot more outside of this limit that we cannot see to stabilise the process. Therefore it might be better to talk about the amount of the universe that is visible to us is decreasing.
am i expanding at the same rate as the universe?