big-bang theory

World English Dictionary
big-bang theory
 
n
Compare steady-state theory a cosmological theory postulating that approximately 12 billion years ago all the matter of the universe, packed into a small superdense mass, was hurled in all directions by a cataclysmic explosion. As the fragments slowed down, the galaxies and stars evolved but the universe is still expanding

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WordNet
big-bang theory

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 
WordNet® 3.0, © 2006 by Princeton University.
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