Astronomers studying the cosmic microwave background have recently inferred the existence of another relic of the Big Bang that pervades the universe. What makes up this other background?
A) gamma rays
B) cosmic rays
C) magnetic fields
D) neutrinos

Question

Quizplus · Accepted Answer

The other relic of the Big Bang that pervades the universe and has been inferred by astronomers studying the cosmic microwave background is made up of neutrinos. These are nearly massless particles that are incredibly abundant in the universe, and like the cosmic microwave background radiation, they are a remnant from the early universe shortly after the Big Bang.

Astronomers Studying the Cosmic Microwave Background Have Recently Inferred the Existence