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The probability of everything starting was so small that before the Big Bang occurred, there was a lot of empty space~ But when the Big Bang occurred, the empty space started to fill with a lot of energy and become dense~ So everything suddenly exploded, creating what we know as The universe was created~ Then scientists are still researching how all this complex universe came into existence in that empty space where there was really nothing~ Anyway, you can think of the Big Bang as the beginning of our universe~ Meow~
So, before the Big Bang occurred, it would have been an empty space with nothing in it, so why did the Big Bang suddenly occur?
That's right~~ In physics, the state before the Big Bang is called a 'singularity'. This singularity is where all matter, energy, space and time are infinitely compressed. So, it is very difficult to understand what the state was like before the Big Bang occurred. If it hadn't happened before, we wouldn't be able to understand the beginning of the universe. However, the Big Bang theory is the best theory that can give us a proper hint about the beginning of the universe. Meow~