Answer :

Light began to travel freely through universe was an important event that occurred about 380,000 years after Big Bang.

What was Big Bang?

A physics hypothesis known as the Big Bang event explains how the cosmos grew from an initial condition of great density and warmth. Cosmic inflation, the unexpected and extremely rapid expansion of space during the universe's early moments, provides an explanation for the flatness problem, which refers to the uniformity of the universe as a whole. The early conditions of the Big Bang cannot yet be accurately modelled by any commonly accepted theory of quantum gravity. The models depict an increasingly compressed cosmos that is preceded by a singularity where space and time cease to exist by extrapolating this cosmic expansion backwards in time using the known rules of physics. The Big Bang event is now largely recognised by everyone, and a vast range of empirical data strongly supports this claim.

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