Question: why does time exsist and when did it begin.


  1. When someone in my physics class at Uni asked this question, the professor responded, “If you want to know *really* why, you should take a theology class, not a physics class.”
    Based on our best observations and mathematical calculations, space and time (collectively called “spacetime”) both started with the Big Bang, when the universe expanded outward from a very small initial point (What happened “before” that? Not only do we not know the answer, our best observations and calculations are not even *able* to answer that question at this point).
    It’s easy to determine what happened afterward, however. We know that the universe has been expanding since the Big Bang for about 13.7 billion years, so it’s more-or-less correct to say that time “began” 13.7 billion years ago.


  2. Wow, what a question. I think Kyler is right, As far as we know there cannot be “time” without matter (things like rocks and water) to create it, and before the big bang there wasn’t any.