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Posted by Alexander on April 10, 2001 00:22:55 UTC

Universe is believed to be 15 billion years old, so it can be 15 light years big if space expanded with c and much bigger if with more than c.

If all matter is concentrated in tiny space and is moving with escape velocity, then it will expand forever. Less than escape- it will collapce. More than escape - it will expand forewer (and will have less and less than critical density).

So, it depends on what is the actual density (of mass-energy) - equal to critical, less or more.

It is believed to be critical.

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