Dictionary
big' bang' the"ory
Astron.
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.