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Re: Why a "big crunch?"
Here's a link that describes critical density well:
How was the critical density of the universe calculated?
Currently, most scientists believe that the universe is open and it will continue to expand indefinitely.
As for the acceleration of the expansion, it is a bit troubling. One possible explanation for this is a mysterious anti-gravitational force named dark energy.
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Hypography Science Forums Moderator
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"There are no passengers on Spaceship Earth. We are all crew." - Marshall McLuhan
"We must not forget that when radium was discovered no one knew that it would prove useful in hospitals. The work was one of pure science. And this is a proof that scientific work must not be considered from the point of view of the direct usefulness of it." - Marie Curie
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