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big-bang theory

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big-bang 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

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Mentioned in

age of the Universe
Big Bang theory
cosmic background radiation
cosmological models
dark matter
decoupling era
Dicke, Robert H.
early Universe
entropy per baryon
expanding Universe
flatness problem
fundamental forces
galaxies, formation and evolution
George Gamow
hadron
helium
horizon problem
hydrogen
inflation

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