After the Big Bang, in order for the universe to become transparent to light and other electro-magnetic radiation "the universe had to cool enough to allow neutral hydrogen to form"
The Big Bang theory explains how the cosmos expanded from a highly dense and hot starting condition. The evolution of the observable cosmos from the earliest known times up to its later large-scale shape is explained by this prevalent cosmological model.
According to scientists, the universe started with every last bit of energy compressed into a single, minuscule point. The explosion from this incredibly dense point created stuff and propelled it outward to form the billions of galaxies that make up our huge cosmos. The Big Bang is the name given to this enormous explosion by astronomers.
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