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Re: Why a "big crunch?"
Thank you for the response freeztar. I checked out the link you provided, a great source for the evolution of the universe. But maybe you can explain something you mentioned, about 'critical mass' of the universe. The concept makes sense, that beyond a certain mass there would be enough attraction to stop and reverse the expansion of the universe.
What i don't understand, however, is if our universe was in fact beyond this critical mass, how could expansion be accelerating (in the positive direction) as it currently is? Big crunch is a theory, so someone believes in its validity, but to me it seems that if a 'crunch' were to occur, the expansion would be accelerating in the opposite direction (slowing expansion). Even if we have calculated the wrong value of lambda, observation shows that expansion is speeding up, not slowing down. Any ideas?
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