Every Theory About the Beginning of the Universe

Space is complicated. We make it simple. The Big Bang isn't one settled story. It's the best-supported theory for what happened after a certain point — and a genuine, unresolved argument about everything before it. In this video we cover: standard Big Bang cosmology, backed by three independent lines of hard evidence; cosmic inflation, the patch that fixed problems the basic model couldn't explain; eternal inflation and the multiverse it implies; the Big Bounce, a universe with no true beginning at all; ekpyrotic brane cosmology, where the Big Bang was a collision between higher-dimensional membranes; Roger Penrose's conformal cyclic cosmology; the no-boundary proposal, which argues "before the beginning" might not be a meaningful question at all; and the simulation and mathematical universe hypotheses. By the end, you'll know exactly which parts of the universe's origin are confirmed science, which are serious but untested theory, and which one argues the question itself might be broken. --- CHAPTERS (estimated from script pacing at ~2.5 words/sec — adjust to your final rendered runtime) 00:00 Intro 00:54 Standard Big Bang Cosmology 02:44 Cosmic Inflation 04:20 Eternal Inflation and the Multiverse 05:45 The Big Bounce 07:25 Ekpyrotic and Cyclic Brane Cosmology 08:51 Conformal Cyclic Cosmology 10:26 The No-Boundary Proposal 12:00 The Simulation and Mathematical Universe Hypotheses 13:29 Ranking by Whether They Even Try to Answer "Before" --- New cosmic explainers every week. Subscribe so you don't miss the next one. Does "what happened before the Big Bang" feel like a real question to you, or a broken one? Tell us in the comments.