Select the statement which is 'NOT' true about Big Bang Theory.

The Big Bang Theory explains the origin of the universe. According to this theory, a singular huge explosion unimaginable in physical terms occurred. The universe expanded and hence, the temperature came down. Hydrogen and Helium formed sometime later, not before the explosion. The gases condensed under gravitation and formed the galaxies of the present day universe.

Therefore, the statement that Hydrogen and Helium gases formed before the explosion is incorrect.

Answer: Hydrogen and Helium gases formed before the explosion.