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DarkTheImmortal t1_jeduiwg wrote

Reply to comment by mfb- in ELi5 If the universe is expanding, what is it expanding into? by cashmoneyhash

The 2nd part you point out you skipped over something. I said an infinite universe can expand AND remain the same size at the same time. To have both of those seemingly contradictory properties at the same time requires an infinite universe. An infinite volume can get bigger, but it's still infinite.

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mfb- t1_jedv127 wrote

Yes, if the universe is finite then its volume increases. So what? Doesn't stop OP's question from being relevant, with the answer still being "it's not expanding into anything".

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