Question

what is the proof for big bang theory??

Answer 1

Big bang theory was developed to explain in early ages that it was nothing for a moment and that it became something another moment. However there was explosion there. It is expansion of universe going on and on. There was no little matter that gathered up and exploded these are the misconceptions.

But a proof that there is a redshift in distant galaxies that shows universe is expanding.

Hope it helps!