In astronomy, theory stating that the gravitational attraction of the mass within the universe will eventually slow down and stop the expansion of the universe. The outward motions of the galaxies will then be reversed, eventually resulting in a Big Crunch where all the matter in the universe will be contracted into a small volume of high density. This could undergo a further Big Bang
, thereby creating another expansion phase. The theory suggests that the universe would alternately expand and collapse through alternate Big Bangs and Big Crunches. After a period when the idea of an oscillating universe fell out of favour, a version of it has been revived under the name of the cyclic model.
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