Scientists have proposed a way that the universe could stop expanding, ending in a 'Big Crunch' that resets space and time as we know it.
Will the universe end in a bang or a whimper? A pair of theoretical physicists have proposed a third path: perhaps the universe will never end.
The great escapeOur universe is currently experiencing a phase of runaway expansion: the cosmos is getting bigger faster with every passing moment. Cosmologists do not understand the cause of this acceleration, which they name dark energy. If this acceleration persists, then our universe will eventually expand into oblivion, with all matter and radiation torn apart.
Astronomers have long wondered if these two phases of accelerated expansion — one in the earliest moments of the Big Bang and one in the present epoch — are connected to each other, and whether an entity that drives both of them avoids the problem of the big bang singularity. They wanted to see if dark energy can avoid a Big Bang singularity, drive inflation, and accelerate the late universe. To avoid that initial singularity, the universe can't begin from a point of infinite density. Instead, the universe we live in would have to be one in an infinite series of repeated"Big Bounces."
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