10 apr 2998363 anni - Recombination, from 240,000 to 300,000 years

Descrizione:

As the temperature of the universe falls to around 3,000 degrees (about the same heat as the surface of the Sun) and its density also continues to fall, ionized hydrogen and helium atoms capture electrons. thus neutralizing their electric charge. With the electrons now bound to atoms, the universe finally becomes transparent to light.

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