There is no evidence for a Universe before the Big Bang

Penrose’s idea of a conformal cyclic cosmology hypothesizes that our Universe arose from a pre-existing Universe that would leave imprints on our cosmos today. This is a fascinating and imaginative alternative to inflation, but the data doesn’t support it, despite Penrose’s dubious claims that it does. (Credit: SkyDivePhil/YouTube)

One of the greatest scientific successes of the past century was the theory of the hot Big Bang: the idea that the Universe, as we observe it and…

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