big-bang theory

/bɪg bæŋ/
IPA guide

Definitions of big-bang theory
  1. noun
    (cosmology) the theory that the universe originated sometime between 10 billion and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature
    synonyms: big bang theory
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    type of:
    scientific theory
    a theory that explains scientific observations
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