big bang theory
big bang theory ig bang theory n. (Astronomy, Cosmology) The theory that the known universe originated in an explosive event (the {big bang}) in which all of the matter and energy of the universe was contained in a single point and began to rapidly expand and evolve, starting as high-energy particles and radiation, and, as it cooled over time, evolving into ordinary subatomic particles, atoms, and then stars and galaxies. According to this theory, the four-dimensional space-time continuum which we perceive as our universe continues to expand to the present time, but it is unknown whether the expansion will continue indefinitely or eventually stop or even reverse, possibly leading to a contraction to a single point sometimes referred to as the ``big crunch''. The competing ``Steady-state Theory'' gradually lost favor in the 1980's and 1990's. See also {big bang}. [PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • big bang theory — big bang .theory n the big bang theory the idea that the universe began with a single large explosion (the big bang ), and that the pieces are still flying apart →↑steady state theory …   Dictionary of contemporary English

  • big-bang theory — [big′baŋ′] n. a theory of cosmology holding that the expansion of the universe began with a gigantic explosion (big bang) between 12 and 20 billion years ago: see STEADY STATE THEORY * * * …   Universalium

  • big-bang theory — [big′baŋ′] n. a theory of cosmology holding that the expansion of the universe began with a gigantic explosion (big bang) between 12 and 20 billion years ago: see STEADY STATE THEORY …   English World dictionary

  • Big Bang Theory — Seriendaten Originaltitel: The Big Bang Theory Produktionsland: USA Produktionsjahr(e): seit 2007 Episodenlänge: etwa 22 Minuten Episodenanzahl: 38+ in 2+ Staffeln Originalsprache …   Deutsch Wikipedia

  • Big Bang Theory — The Big Bang Theory Pour les articles homonymes, voir Big Bang (homonymie). The Big Bang Theory Logo de The Big Bang Theory …   Wikipédia en Français

  • 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 • Syn: ↑big bang theory • Topics:… …   Useful english dictionary

  • 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 • Syn: ↑big bang theory • Topics:… …   Useful english dictionary

  • big bang theory — N SING: the N In astronomy the big bang theory is a theory that suggests that the universe was created as a result of an extremely large explosion …   English dictionary

  • big bang theory — big′ bang′ the ory n. astron. a theory that the universe began with an explosion of a dense mass of matter and is still expanding from the force of that explosion • Etymology: 1950–55 …   From formal English to slang

  • big bang theory — 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 model. Cf. steady… …   Universalium

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