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The big bang theory describes the universe as originating from a single point in a large explosion which would have occurred roughly 14 billion years ago, and is a widely accepted theory because it seems to fit observations, particularly a measurable outward expansion of matter in the universe. The big crunch is somewhat the opposite, it describes a theory for the fate of the universe where gravitational force eventually overcomes the outward expansion and all matter collapses back together. The big rip theory reflects another possible fate of the universe in which forces that cause expansion become so dominant that it eventually rips apart not only galaxies and stars, but atoms and particles themselves. This last theory hinges on properties of dark energy which appears to play a significant role in the expansion of the universe.

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