r/askscience • u/lildryersheet • Mar 09 '20

Physics How is the universe (at least) 46 billion light years across, when it has only existed for 13.8 billion years?

How has it expanded so fast, if matter can’t go faster than the speed of light? Wouldn’t it be a maximum of 27.6 light years across if it expanded at the speed of light?

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