- 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.
- 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
