The Big Bang sound: Cosmic Microwave Background Radiation

They had to make the pidgeons go away from the roof to be sure there was not their fault but they did it. The cosmic microwave background radiation, also known as relic radiation, is an eletcromagnetic radiation. The oldest one in the universe, dating (about) to 379.000 years after the Big Bang in the epoch of recombination, in which charged electrons and protons became bound to form electrically neutral hydrogen atoms, the first atoms in the Universe.
The background space between stars and galaxies to the optical instruments is dark; but a radio telescope shows a a background noise that is not associated to any object.
The accidental discovery of CMBR in 1964 by Penzias and Wilson earned to them the Noble Prize in Physics.
This is the CMBR audio, and remember: when the radio is tuned to a frequency that is between stations, part of the hiss that you hear, called “white noise”, is the leftover radiation from the Big Bang some 13.7 billion years ago.
(Credits:ESA/ Planck/ WA University)

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