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SlideshowReport

Evolution of Density

Description
Evolution of Density
For approximately 30,000 years after the Big Bang, the gravitational effects from
photons (ρrad, shown in red) exceeded the attraction of all the matter in the
universe (ρm, shown in blue). This early period is said to have been radiation-
dominated. Later, however, continued expansion of the universe caused ρrad to
become less than ρm, at which time the universe became matter-dominated.
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