The big crunch is not just the big bang run backward in time. It's more at the time reverse. So stars will start to be cooked from the inside out. And you can predict you know when it's going to happen, right? Like if the universe were collapsing through general relativity, we could say exactly how long we have it.
Cosmologists are always talking excitedly about the Big Bang and all the cool stuff that happened in the 14 billion years between then and now. But what about the future? We don't know for sure, but we know enough about the laws of physics to sketch out several plausible scenarios for what the future of our universe will hold. Katie Mack is a cosmologist who is writing a book about the end of the universe. We talk about the possibilities of a Big Crunch (and potential Big Bounce), a gentle cooling off where the universe gradually grows silent, and of course the prospect of a dramatic phase transition, otherwise known as the "bubble of quantum death." Which would make a great name for a band, I think we can all agree.
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Katherine (Katie) Mack received her Ph.D. in physics from Princeton University. She is currently an Assistant Professor at North Carolina State University, where her research centers on theoretical cosmology, including dark matter and black holes. She is also a member of NCSU’s Leadership in Public Science Cluster. Her upcoming book, The End of Everything, will be published in 2020.
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