Question

what is the Big Bang?

Answer 1

heya.......

the rapid expansion of matter from a state of extremely high density and temperature which according to current cosmological theories marked the origin of the universe.

tysm..@kundan

Answer 2

The theory states that about 13.7 billion years ago all the matter in the Universe was concentrated into a single incredibly tiny point. This began to enlarge rapidly in a hot explosion, and it is still expanding today. Evidence for the Big Bang includes: all the galaxies are moving away from us.