Question

Define a big bang theory???​

Answer 1

Answer:

Hi friends

Explanation:

: a theory in astronomy: the universe originated billions of years ago in a rapid expansion from a single point of nearly infinite energy density — compare steady state theory.

I hope this helps you

Answer 2

Answer:

The Big Bang theory is the prevailing cosmological model explaining the existence of the observable universe from the earliest known periods through its subsequent large-scale evolution.