Question

What is big bang theory?

Answer 1

Answer:

The Big Bang is the name that scientists use for the most common theory of the universe, from the very early stages to the present day. The universe began as a very hot, small, and dense superforce (the mix of the four fundamental forces), with no stars, atoms, form, or structure (called a "singularity").

Answer 2

Explanation:

the big bang theory is a cosmological model for the observable universe .

In simple words- Birth of the existence. the big bang was around 13.0 billion years ago which thus consider the age of universe