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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Qmechanic
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2Because the universe is expanding. See answers to related questions – RedGrittyBrick May 23 '17 at 13:05
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I would add that the expansion of the universe is accelerating. – T. Auerrac May 23 '17 at 13:07
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1Possible duplicate of Why is the observable universe so big? – RedGrittyBrick May 23 '17 at 13:09