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It is my understanding that the universe is expanding and that matter takes up space. While the universe only contains small percent of matter, wouldn't expansion indicate that the universe is encroaching/growing into other space(other universes, dark matter, dark energy, something)?

What is the universe expanding into (or don't we know)? Or is there some other way of understanding the expanding universe?

Related question about universe itself, not outside of it (unless I misread/misunderstood it)

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I find it helpful, when considering a universe that may be infinite, to think of everything within space getting smaller, rather than space itself getting "bigger". Rulers, planets, stars, galaxies. That allows visualisation of an expanding universe without having to worry about the "edges". Not very scientific as it assumes space itself is empty, but it eases my brain!

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    $\begingroup$ several articles I've seen seem to indicate the universe has a size one source. While the edges are probably not clearly defined, what was in the 'space' before the universe reached that point? $\endgroup$
    – depperm
    Jul 15 at 19:35

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