GENERAL KNOWLEDGE

Detailed explanation-1: -Simply put, it says the universe as we know it started with an infinitely hot and dense single point that inflated and stretched-first at unimaginable speeds, and then at a more measurable rate-over the next 13.7 billion years to the still-expanding cosmos that we know today.

Detailed explanation-2: -The Big Bang event is a physical theory that describes how the universe expanded from an initial state of high density and temperature. Various cosmological models of the Big Bang explain the evolution of the observable universe from the earliest known periods through its subsequent large-scale form.

Detailed explanation-3: -The closed big bang theory states that the universe began in a big bang, but gravity will eventually overcome the inertia and contract, ending in a big crunch. The Inflationary Model states that the universe expanded rapidly and exponentially shortly after the big bang and then slowed down.