Which event in the history of the universe happened last?
A)Stable helium nuclei formed.
B)The GUT force separated into the electroweak force and strong force.
C)Neutral atoms formed.
D)The electroweak force separated into electromagnetic and weak nuclear forces.

Question

Quizplus · Accepted Answer

Neutral atoms formed last, as this was the point at which the universe became transparent to light, allowing it to travel through space without being scattered by charged particles. This event occurred about 380,000 years after the Big Bang.

Which Event in the History of the Universe Happened Last