What happened to all of the quarks that existed freely during the particle era?
A) They combined in groups to make protons, neutrons, and their antiparticles.
B) They froze out of the soup of particles at the end of the era.
C) They evaporated.
D) They combined in groups to make electrons and neutrinos.

Question

Quizplus · Accepted Answer

During the particle era, the universe was filled with a hot, dense soup of particles, including quarks. As the universe expanded and cooled, the quarks combined in groups of two or three to form protons, neutrons, and their antiparticles. This process is known as nucleosynthesis.

What Happened to All of the Quarks That Existed Freely