What does big-bang theory mean?

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What does big-bang theory mean?

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• BIG-BANG THEORY (noun) The noun BIG-BANG THEORY has 1 sense: 1. (cosmology) the theory that the universe originated 20 billion years ago from the cataclysmic explosion of a small mass of matter at extremely high density and temperature Familiarity information: BIG-BANG THEORY used as a noun is very rare.

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