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It's always been in the back of my head that the Universe is 13.8~ billion years old and that the Observable Universe is 46~ billion light years in radius. How is this so? It would logically be only 13.8~ billion light years in diameter as that is the length of time it would take for things 13.8~ billion years to get to us?

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marked as duplicate by RedGrittyBrick, Qmechanic May 23 '17 at 13:13

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