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Originally Posted by Praxus
If the Universe - the sum of all that exists - were expanding, it would have to expand into something that doesn't exist for it to expand into.
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That's where your misunderstanding is. There is no space outside the universe. Space is defined within the universe. Space itself is curved. That is to say, you cannot travel outside the universe. You go in a straight line long enough, you'll end back right back where you started from (assuming everything stays still). So, space is expanding and by extension, the universe is expanding.