Which of these four periods of time describes this universe at present?
A) inflationary period, in which the universe expands rapidly
B) era of recombination, in which electrons and protons combine to form hydrogen atoms
C) the Planck era, in which all four forces of nature are unified
D) period of confinement, in which quarks are unable to travel freely

Question

Quizplus · Accepted Answer

The universe is currently in a period where quarks are confined within protons and neutrons, and cannot travel freely, which is consistent with the period of confinement.

Which of These Four Periods of Time Describes This Universe