The Big Bang Timeline Let us understand how was the universe created, according to the big bang theory. Universe began from a singularity. At a singularity, infinite density created infinite curvature, due to which the classical laws of general relativity, rather all known laws of physics break down. Therefore, what happened before the big bang is something which nobody can answer. The age of the universe according to Big Bang theory is estimated to be 13.73 (± 0.12) billion years. Taking the Bi