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What does it mean when you say that the universe is below the critical density?
Wiki User
∙ 12y ago
If the universe is ever to stop expanding and start contracting there has to be a certain amount of material (mass). This amount is called the 'critical density'.
So far as is known to date the universe does not have sufficient mass to stop expanding, hence it is below the critical density.
Wiki User
∙ 12y ago
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