“There was no time before big bang” – what does that mean?

Question

“There was no time before big bang” – what does that mean?

In: Physics

Answer 1

The Big Bang created both space and time.

The initial event went from essentially nothing to something very large in the tiniest fraction of a second. To be precise, it expanded its volume 10^78 times in 10^(-32) of a second.

We know that as things get more dense, time around it slows down. Rewinding the Big Bang, the Universe was so dense that time stopped and space itself did not exist. There was no ‘before’ because there was no anywhere for a ticking clock nor was there anywhen for a ticking clock to exist within.