In the more commonly-accepted hypothesis, the universe started from a singularity, a point of infinite density and gravity, inflating rapidly as a result of the Big Bang, and kept expanding until reaching the shape we find ourselves in today, about 13.8 billion years later. In another view, the Big Bang is just one of an endless cycle of expansion and contraction, ending with a “Big Crunch” and restarting with a Big Bang. A new study offers a caveat that challenges the cyclic universe theory, proposing that even the so-called “bouncing” universes must have a beginning.
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