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Re: Why a "big crunch?"
It seems to me that the observation and the theory are incompatible, that the accelerating expansion (whether or not due to dark energy) rules out a big crunch. Correct me if i'm wrong...
From your links, the relationship between critical density and shape/evolution of the universe is fairly clear, and with the observation that expansion is accelerating, I can see why most believe the universe to be open.
So i suppose the real answer is, a big crunch is NOT a plausible fate of the universe, given the validity of modern observations?
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