Meaning of BIG BANG THEORY

WordNet Dictionary
	Definition:		[n]  (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 [n]  (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
	Synonyms:		big bang theory, big-bang theory
	See Also:		scientific theory