# Why did the big bang happen when it did?

Was there time before the big bang?

I assume there wasn't, so is it even logical to ask if there was anything before the big bang? If there was time before the beginning of the universe, what happened before it was made?

Would we ever know? Where did the universe come from? What will happen to it? Even though it is expanding, will it last forever?

• Is this a dumb question? I apologize if it is but it would be cool if someone could address it. – syzygy Nov 23 '15 at 2:50
• "If there was time before the beginning of the universe" - there has never been a time in which time did not exist. – Alfred Centauri Nov 23 '15 at 3:11
• @syzygy Physicists can answer one of the question you ask clearly: Is this a dumb question? The answer is: No! – Volker Siegel Aug 27 '16 at 13:13

All of your questions have no good answer at this point in time. All of them are being researched by physicists, cosmologists, and theorists. We don't even know whether our universe is the only universe or whether what lies beyond the visible universe is just more space like the kind we can see. Our best theories of space and time (Einstein's General Relativity) and particles (quantum field theory) only tell us about what the universe was doing a small fraction of a second after the big bang. We have experimental evidence from particle accelerators that confirms this picture back to one second after the big bang. However, what happened earlier, including the bang itself, is a mystery.

• or whether what lies beyond the visible universe is just more space like the kind we can see I recall reading that we do have a lower bound for the number of Hubble volumes out there beyond the visible volume, but you're right that we don't yet know whether or not it is infinite. – forest Nov 8 '18 at 8:46