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big' bang' the"ory

a theory that deduces a cataclysmic birth of the universe (big' bang') from the observed expansion of the universe, cosmic background radiation, abundance of the elements, and the laws of physics. Also called big'-bang' mod"el. Cf. steady state theory.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Big Band musicbig beat
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