Question

If the universe was born at the Big Bang,then what existed before that??

Answer 1

The whole universe was compressed in an atom sized thing. Due to increase in temperature it created Big Bang.

Answer 2

According to the big bang theory, one of the main contenders vying to explain how the universe came to be, all the matter in the cosmos -- all of space itself -- existed in a form smaller than a subatomic particle. Once you think about that, an even more difficult question arises ...