In the standard model, about when after the Big Bang did the universe become transparent to radiation? A)10^-43 s B)10^-³⁵ s C)10³ s D)3 × 10⁵ y E)3 × 10⁶ y

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Quizplus · Accepted Answer

The universe became transparent to radiation about 380,000 years after the Big Bang, when electrons and protons combined to form neutral hydrogen atoms, allowing photons to travel freely.

In the Standard Model, About When After the Big Bang