Quote:
Originally Posted by bubur
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if time extends into infinity, when did it begin?
this is important answer honestly
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It depends whether by time you mean every single one of the universe's sequential chain of events that have ever happened, or time as a dimension of reality.
If it's the former, our best evidence says time began at the big bang, because the big bang was the deterministic beginning of the universe's causal chain. Prior to the big bang, time as a dimension is meaningless, because there is no change, no cause and effect, no events... if the dimension even existed at all. Everything that has happened or will ever happen was determined at that instant. If you had godlike intelligence and godlike sensation, and were able to perceive every distinct particle and quanta of energy, its trajectory, and the effect it would have on other matter and energy, on and on forever, you would essentially perceive time as a line or flat circle, like you are looking at it from above or from the outside (this was explored somewhat in Interstellar). You would have perfect understanding of all future events.
If it's the latter, I don't think we know or have any idea with any evidence behind it.