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No one said the universe was not eternal , just that at some point, the parts we can see will be cold and dark at best or squished back into a tiny space.
Seemingly empty space is apparently full of energy which is predicted by relativity but no one, according to Carlo Rovelli, really understands what that means or how gravity and quantum mechanics interact. Surely not you or I. It is just interesting to find out about.
There are plenty of convincing papers by scientists with many peer reviewed papers to their names in explaining in simpler language how the universe that we can see started in a very small space.
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