A novel theory suggests that the current expansion rate of the universe is not fixed, but was in fact quite different in the ...

According to a new theory, our universe developed from a “pre-inflationary multiverse” made of particles in quantum superposition.

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Is the universe infinite? It's one of the most profound questions we can ask, and here's the short answer: We don't know. While we have learned a great deal about the universe, a portion of the cosmos ...