Question

can anyone plz tell me what is big- bang theory?
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Answer 1

Answer:

The basics of the theory are fairly simple. In short, the Big Bang hypothesis states that all of the current and past matter in the Universe came into existence at the same time, roughly 13.8 billion years ago. ... Suddenly, the Singularity began expanding, and the universe as we know it began.

Answer 2

At it is simple , it is easy the universe as we know it started with an infinitely hot, infinity dens sigularity, then inflated - frist at unimaginable speed, and then at a more mesurable rate - over the next 13.8 billion years to the cosmos that we know today

what caused the big bang theory:-

The universe began, scientists belive, with every speck of its energy jammed into a very tiny point. This extremely dense point exploded with unimaginable force, created matter and propelling it outward to make the billions of galaxies of our vast univers. Astrophysicist dubbed thistitanic explosion the Big Bang