The most recent "freezing" of the universe involved the creation of
A) nuclei.
B) atoms.
C) elementary particles.
D) quarks.
E) molecules.

Question

Quizplus · Accepted Answer

The most recent "freezing" of the universe involved the creation of atoms, which occurred about 380,000 years after the Big Bang. Prior to this, the universe was too hot and dense for atoms to form, and instead consisted of a hot plasma of charged particles. As the universe expanded and cooled, protons, neutrons, and electrons were able to combine to form neutral atoms, leading to the universe becoming transparent to light for the first time.

The Most Recent "Freezing" of the Universe Involved the Creation