I'm not able to imagine how flat universe have infinite volume can anyone please tell?
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1$\begingroup$ Very much related/possible duplicate physics.stackexchange.com/a/123692/23615 $\endgroup$– TriatticusNov 29, 2021 at 12:10
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$\begingroup$ A (simply connected) universe is infinite i.e. if you draw a straight line that line will go on forever without ending. So it has an infinite volume. Or were you asking something more subtle that this? $\endgroup$– John RennieNov 29, 2021 at 12:31
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$\begingroup$ can you give more explanation of this @John Reinni $\endgroup$– RK_SmithNov 29, 2021 at 12:40
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1 Answer
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"Flat" in this context doesn't mean flat like a sheet of paper, which is two dimensional. Space is three dimensional and thus can have volume; "flat" means that it doesn't have curvature. 3D curvature is hard (or impossible) to visualize, but it can exist, and we know from observations that on average the universe doesn't have any large scale curvature, so we call it flat. Not flat like a plane - flat like the regular 3D space we're used to.
