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The standard explanation is that it is residual heat from the very hot quark-gluon plasma that filled the early universe. The observed radiation fits very well with a model that posits the Big Bang happened about 13 billion years ago.

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Q: Why would there be background radiation in the universe?
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Related questions

The heat left over from the beginning of the universe is?

cosmic microwave background radiation.


The Doppler shifting of radiation from the early universe has resulted in today's universe being bathed in a sea of?

Cosmic Microwave Background (CMB) Radiation.


What does the uniformity of cosmic radiation imply about its source?

The source of cosmic background radiation filled the entire universe.


How did cosmic background radiation relate to the formation of the universe?

I sent a form of thermal energy throughout the universe.


Where did the cosimc microwave background radiation take place?

Where? Everywhere. This is the residual radiation, from when the Universe was very, very hot.


How the universe is changing by cosmic background?

The cosmic background radiation is an observation of the effects of the Big bang [See related question] it does not effect the Universe changing in anyway.


How ia cosmic background radiation related to the big bang theory?

The cosmic background radiation is believed to be the remains of the radiation emitted by the Universe when it started to get transparent - when it had cooled down to a temperature of about 3000 kelvin.


Why did the discovery of background radiation with a wavelength of 7.35 cm help to support the big bang theory of the universe?

I am not entirely sure about the wavelength; however, the features of the background radiation agree very closely to what would be expected from the Big Bang theory.


What kind of information do astronomers use to study how and when the universe formed?

Cosmic Background Radiation


What helped scientist determine the age of the universe?

The redshift of the cosmic microwave background radiation


What may the ripples in the cosmic background radiation indicate about the early universe?

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Which theory of the universe did the 1964 discovery of cosmic microwave background radiation support?

I didn't check the year... But the cosmic background radiation is said to support the big bang theory, because it agrees with the radiation that is expected from an expanding Universe.