What significant event occurred 380,000 years after the start of the Big Bang?
A) The production of helium ceased.
B) All of the galaxies we see today formed.
C) Quarks became confined in nuclei.
D) Electrons and nuclei combined to form neutral atoms.

Question

Quizplus · Accepted Answer

380,000 years after the start of the Big Bang is known as the recombination era, when the Universe had cooled enough for electrons and nuclei to combine and form neutral atoms. This was a significant event because it allowed radiation to travel freely through the Universe, leading to the formation of the cosmic microwave background radiation that we observe today.

What Significant Event Occurred 380,000 Years After the Start of the Big