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big bang theory
noun
, Astronomy.
- 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.
big-bang theory
noun
- 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 Compare steady-state theory
Big Bang theory
- In astronomy , a theory according to which the universe began billions of years ago in a single event, similar to an explosion. There is evidence for the Big Bang theory in the observed red shift of distant galaxies , which indicates that they are moving away from the Earth , in the existence of cosmic microwave background , and from other data. The Big Bang theory of the origin of the universe is accepted by most astronomers today.
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Notes
Scientists have recently found that the expansion of the universe is actually speeding up. This effect is attributed to the presence of dark energy .
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Word History and Origins
Origin of big bang theory1
First recorded in 1950–55
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Example Sentences
In 1996, John Paul II called the Big Bang theory “more than a hypothesis.”
From The Daily Beast
But in many ways, too, The Big Bang Theory is a far more audacious series than it gets credit for.
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Eight seasons in, The Big Bang Theory is one of the funniest shows on TV.
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Calvin astronomer Howard Van Till was for years the leading evangelical champion of the Big Bang Theory.
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Maybe missing an episode of The Big Bang Theory or Keeping Up with the Kardashians?
From The Daily Beast
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