1. big bang - Noun
2. Big bang - Proper noun
(cosmology) the cosmic explosion that is hypothesized to have marked the origin of the universe
Source: WordNetThe Big Bang theory says nothing about what banged, why it banged, or what happened before it banged. Alan Guth
By looking far out into space we are also looking far back into time, back toward the horizon of the universe, back toward the epoch of the Big Bang. Carl Sagan
Four predictions of the Big Bang Theory have now been verified - surely enough to quench even the most biased critics. Joseph Silk
They say it all started out with a big bang. But, what I wonder is, was it a big bang or did it just seem big because there wasn't anything else drown it out at the time? Karl Pilkington
The world starts with a Big Bang and finishes with a human-made atomic Big Bang! Javad Alizadeh
But what about the End of the Universe? We'll miss the big moment." I've seen it. It's rubbish," said Zaphod,"nothing but a gnab gib." A what?" Opposite of a big bang. Come on, let's get zappy. Douglas Adams