50 Simple Proofs, God is Imaginary

[Tiberius]

If time did not exist before the 'Big Bang'... then the Big Bang could never have happened There is no time in which the actions of the Big Bang could take place... so essentially there would have to be time behind the Big Bang. They do not ask this question erroneously, because there would have had to be a 'before the Bang' for the Bang to have taken place. Unless "nothing became something and exploded into everything" is "true" to the theory of the Big Bang ^_^

Unless the Big Bang was the start of time and space, which is the current theory. Essentially all of space was contained within an infinitely small, infinitely dense point with no time. Time began, and the point expanded rapidly.

Pretty much a layman's explanation of the Big Bang idea.