Astronomers have found the cosmic microwave background (CMB) radiation. What is the nature of this radiation?
A) It is a bright, uniform X-ray glow.
B) It is a faint, uniform radio signal.
C) It is a faint, uniform X-ray glow.
D) It is a weak and very patchy glow at visible wavelengths.
E) It is a weak background of cosmic neutrinos.

Question

Quizplus · Accepted Answer

The cosmic microwave background (CMB) radiation is a faint, uniform radio signal that fills the universe, representing the thermal radiation left over from the Big Bang.

Astronomers Have Found the Cosmic Microwave Background (CMB) Radiation