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BIG BANG EXPANSION SCENARIOS

[[Big Bang|BIG BANG]] EXPANSION SCENARIOS

The Universe is (1) open, (2) closed, or (3), flat, depending on whether the ratio of its

[[The Universe]] is (1) open, (2) closed, or (3), flat, depending on whether the [[ratio]] of its

actual density to the "critical density", called omega, is <1, >1, or precisely equal

actual [[density]] to the "critical density", called omega, is <1, >1, or precisely equal

to 1. The "critical density" of the Universe is the density above which the Universe

to 1. The "critical density" of the Universe is the density above which the Universe

would go on expanding forever.

would go on expanding forever.