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70 | Katie Mack on How the Universe Will End
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
The Big Crunch: The End of the Universe
If dark energy is something other than a cosmological constant, there's nothing to say that it doesn't turn around and go from doing expansion to sort of contracting. And if that's the case, then we can end with a big crunch. So that would be where the expansion would some point stop, turn around and everything would come together again. The chance of stars individually hitting each other is tiny. Even when we're going to collide with Andromeda in four billion years, the chance that any single stars like hit each other in that collision is vanishing.
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