The universe is estimated to contain around 10^22 to 10^24 cosmic microwave background radiation.
This description provides an overview of the estimated amount of cosmic microwave background radiation (CMBR) in the universe. CMBR is a form of electromagnetic radiation that is believed to be a remnant of the Big Bang. Estimates of the amount of CMBR in the universe range from 10
The cosmic microwave background, or relic radiation, is microwave radiation that fills all space in the observable universe. With a standard optical telescope, the background space between stars and galaxies is almost completely dark. However, a sufficiently sensitive radio telescope detects a faint background glow that is almost uniform and is not associated with any star, galaxy, or other object. This glow is strongest in the microwave region of the electromagnetic spectrum. Its energy density exceeds that of all the photons emitted by all the stars in the history of the universe. The accidental discovery of the CMB in 1964 by the American radio astronomers Arno Allan Penzias and Robert Woodrow Wilson was the culmination of work initiated in the 1940s.