A trio of astrophysicists, two from Princeton, the other from New York University, has calculated estimations on how soon the universe could collapse if theories regarding dark energy as having quintessence are correct. In their paper published in Proceedings of the National Academy of Sciences, Cosmin Andrei, Anna Ijjas, and Paul Steinhardt suggest it could be as soon as 100 million years from now.
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Source: Phys.org