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The Big Bang Theory
There are many alternatives starting with so the singularity quantum cosmologically demanding singular origin of the universe. Many of them feature cycles, at least one cycle, possibly infinite number of cycles called by Sir Roger Penrose. And they all have things in common, these alternatives, as does the dominant paradigm of cosmogenesis, which is inflation. Inflation is sort of can be thought of as this spark that ignites the hot Big Bang that I said we understood. So it's an earlier condition, but it's still not an initial condition. Think about understanding the whole universe without understanding the initial conditions.