The big bang theory of the origin of the universe was once very popular.
The basic framework is the standard big bang theory for the expansion of the universe.
A picture of the origin of the universe that has much in its favor is the big bang theory.
A form of matter hypothesized by proponents of the big bang theory to have existed before the formation of the chemical elements.
As an extension of the big bang theory inflation theory predicts the universe density is rather close to the critical density. Thus the universe is flat.
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