# When did the Big Bang happen?

Did the Big Bang happen at a point? goes through the fact that the Big Bang happened everywhere at the same time. John Rennie's answer explains this as being a consequence of all points in space beings squished into a single point, so technically the Big Bang happened everywhere. But, when we talk about relativity, we also use a fourth dimension of time. So, at the Big Bang all points in space, as well as all points in time should be squished (for lack of better terms) into a single point. So did the Big Bang happen at happen 'every-time'?

Edit: The age of the universe goes into how the true age of the universe can be determined as time flows in different ways for different observers. I am asking whether the Big Bang happened at all points in time together.

• Does this answer your question? The age of the universe Commented Aug 20, 2020 at 2:48
• Or this one: physics.stackexchange.com/q/516661 Commented Aug 20, 2020 at 2:48
• I wonder if the age of the universe if different at different points in space, for example, at the "center of the universe" wherever the point is where all matter was originally contained into a singularity (which I believe would be the center of mass of the universe) the universe would be some time, x, old. However, closer to the "edges" of the universe would the universe be technically newer because time didn't start ticking at those points until later? Maybe this should be its own question but it fits so well with this question. Commented Aug 20, 2020 at 3:19
• @Allure no. Those are about the age of the universe in the sense that how the true age can be determined. I am asking whether the Big bang happened at every point in time.
– PNS
Commented Aug 20, 2020 at 3:57
• Is the big bang happening now? Commented Aug 20, 2020 at 4:07