Do we live in a rotating universe? If we did, we could travel back in time

We know that planets rotate, but what about the universe as a whole? No, the universe doesn’t appear to rotate; if it did, time travel into the past might be possible.

Although people throughout antiquity had argued that the heavens rotate around the world, in 1949, mathematician Kurt Gödel was the first to provide a modern formulation of a rotating universe. He used the language of Albert Einstein‘s theory of general relativity to do so, as a way of honoring his friend and neighbor at Princeton, Einstein himself.

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