The cosmic background radiation corresponds to a temperature of about
A) 20 K.
B) 2.7 K.
C) 1.4 K.
D) 8.0 K.

Question

Quizplus · Accepted Answer

The cosmic background radiation, also known as the cosmic microwave background (CMB), corresponds to a temperature of about 2.7 Kelvin. This radiation is a remnant from the early universe, specifically from a time about 380,000 years after the Big Bang, when the universe cooled enough for electrons and protons to combine into neutral hydrogen atoms, allowing photons to travel freely.

The Cosmic Background Radiation Corresponds to a Temperature of About