Question

what caused the big bang

Answer 1

We've all heard of the Big Bang theory (I'm talking about the cosmological model, not the TV show), but it's important to understand what that theory is and what it's not. Let me take this opportunity to be precisely, abundantly, emphatically, ridiculously, fantastically clear: The Big Bang theory is not a theory of the creation of the universe. Full stop. Done. Call it. Burn that sentence into your brain. Say it before you go to sleep, and first thing when you wake up.
The birth of the Dark Energy Age might not seem that dramatic, but the further back you go in time — and the smaller you make the universe — the stranger it gets. Push back more than 13 billion years, when the universe was just one-thousandth of its current extent, and the matter that would one day make up entire galaxies is crammed together so tightly that atoms can't even form. It's so dense that every time a nucleus ropes in an electron, a careless high-energy photon slams into it, ripping the electron away. This is a plasma, and at one time, the entire universe lived like this. 

Answer 2

Answer:

The Big Bang Theory is just a explanation of how the universe formed.

Explanation:

Scientists have tried so hard to find out the answer to this question. I, too have this question in my mind. It is too hard to understand why there is no actual cause for this reaction. There are many theories which the scientists have told us regarding this. Hope this answer helped. And hope the scientists find the solution to this soon.