And no, the answer isn't 42!
I don't know the answer, but I do know the question. I've know it almost my entire life, and it hurts my head to even think about it.
I've always been a pretty inquisitive person, so it was pretty natural for me to wonder where we & all that is around us came from. When i was a kid, I gobbled up the religious explanation that god created the universe. But I didn't leave it at that. If god created us, who created god? I mean god couldn't have just popped outta nothing & then said, I'm gonna create a universe! So I reasoned gods were created by their gods & they by their gods & so on......! I envisioned gods walking around, up in the sky, with their gods walking around up in their sky & their gods up their sky,...pfft! Then I became an atheist & the god angle flew out of the window.
Another kinda weird theory I had for a while was that we were some kids science project. I used to imagine the solar system in a dark attic and a kid & his dad working on the solar system. But that was just a crazy dream I had.
Later on I learned about the big bang & that all the matter in the universe is all part of this giant mass of matter called the primeval atom which exploded & spluttered all its mass in all directions, giving birth to our universe. And, this is the explanation I like to believe in, well kinda.
The primeval atom exploding & starting the universe is all good, but the real question is, where the hell did the primeval atom come from?(or if you believe in the god angle, where the hell did god come from?)
And that, is The Ultimate Question of Life, the Universe, and Everything.