What is big-bang theory?

The Big Bang Theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution.

It states that the universe was initially in an extremely hot and dense state which expanded rapidly.

The Big Bang Theory is based on two theoretical pillars: Albert Einstein's general theory of relativity, and the cosmological principle.

The Big Bang Theory explains the origin of the universe and its development over time.

It explains the observed expansion of the universe, as well as the abundance of light elements such as hydrogen and helium.

It also explains the cosmic microwave background radiation, which is a faint glow of radiation left over from the Big Bang.

The Big Bang Theory is the only cosmological model that is consistent with all astronomical observations.

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