What is cosmic microwave background radiation?

Cosmic microwave background radiation (CMBR) is a form of electromagnetic radiation, specifically in the microwave region of the electromagnetic spectrum.

It is believed to be a residual thermal energy that is left over from the Big Bang.

CMBR is the oldest light in the universe and is believed to be the same in all directions of the sky.

CMBR is often referred to as "relic radiation" because it is left over from the Big Bang.

It was first discovered in 1965 by American radio astronomers Arno Penzias and Robert Wilson.

It is believed to be made up of photons that have been stretched as the universe has expanded over time.

It is estimated to be around 2.725 K or -270.425°C.

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