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I thought "open" and "closed" were used to describe whether the Universe
would collapse or not -- ie whether the Universe would expand forever or at
some point start to contract to an eventual Big Crunch.
But this aside for a moment --and whether we can actually "see" (by
whatever means) to the "edge" of the Universe -- doesn't the current
standard model assume that the Universe is finite in size
-- although I
don't know what that would mean: There could be no one standing outside
the Universe with a large caliper to measure the size. Or ....