AST201H1 Lecture Notes - Lecture 13: Density, Big Crunch, Cosmic Microwave Background

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AST201H1 Full Course Notes
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AST201H1 Full Course Notes
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Mass density of the universe is large enough, an expanding universe will eventually collapse again. If the mass density of the universe is zero, the expansion of the universe will continue forever without slowing down. If the mass density of the universe is smaller than the critical density, the expansion will slow down but never stop. If the mass density of the universe is exactly right, then the expansion will keep slowing down to a stop. If the mass density of the universe is large enough, the universe will collapse again in a big crunch. If expansion is slowing down, distant galaxies should have larger redshifts than predicted by. But, we have found that the expansion of space is accelerating --> the universe is expanding. If you put dark energy in an expanding universe, you get an accelerating expanding universe. Measurements of the cosmic microwave background show the overall composition of the.

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