re: Do you think space is infinite?

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Off the top of my head, and I could be wrong, but space is not expanding. The stuff in space is expanding. The fact that the stuff in space that's expanding has a place to expand to says that space was already there to begin with.

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Spacetime, a real thing, is expanding. Matter in spacetime is not expanding, yet. The theory around the Dark Force says that eventually even matter will expand down to its basic components.