As possible as anything else and as much evidence as anything else. We have basically no information of what is "outside" of our universe (in space, or time) if that even has any real meaning.
One thought in the line of reasoning that it is entirely cyclic is that the universe is just one side of the coin, at the end of this cycle we get a big crunch and another big bang where in some manner matter and energy are reversed, a negative-universe. Purely speculation and wishful thinking as the others with no evidence, but a fun thought experiment.
On the other hand, it's possible that our universe might simply expand forever. Continue expanding until everything is stretched so far apart that the temperature across all of space is an infinitesimally small fraction above absolute zero. While that might not tell us much about the beginning, it is certainly a lackluster "end".
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One thought in the line of reasoning that it is entirely cyclic is that the universe is just one side of the coin, at the end of this cycle we get a big crunch and another big bang where in some manner matter and energy are reversed, a negative-universe. Purely speculation and wishful thinking as the others with no evidence, but a fun thought experiment.
On the other hand, it's possible that our universe might simply expand forever. Continue expanding until everything is stretched so far apart that the temperature across all of space is an infinitesimally small fraction above absolute zero. While that might not tell us much about the beginning, it is certainly a lackluster "end".