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I: Early Universe. - Big Bang Nucleosynthesis and the Density of Baryons in the Universe. - Observed Densities in the Universe. - Big Bang Theory and Primordial Nuclei. - II: Extragalactic Objects.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.