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The CMB originated when the universe went transparent to electromagnetic radiation, when electrons and protons first combined to form hydrogen. This is estimated to have happened some 377.000 years after the onset of the Big Bang.

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11y ago
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13y ago

2.73 kelvin

most of it is much colder

So what is the average of the 2.73 Kelvin and the rest of the Universe that is much colder?

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13y ago

The average temperature of the cosmic microwave background is 2.725 degrees Kelvin. The small variations (anisotropies) are about 1 part in 100,000.

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12y ago

The cosmic microwave background radiation has a black-body spectrum with a temperature of 2.7 K (2.7 Kelvin, or about -270.5 oC).

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8y ago

The question makes no sense. It is like asking for the size of starlight!

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13y ago

It's everywhere.

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Q: What is the average temperature of the universe?
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Related questions

What is the temperature of the average energy?

The universe is about 2.3 Kelvin


The average temperature of the universe right now is about 2.73 K Will this temperature likely go up or down over the next billion years?

The temperature will most likely go down because over time the universe continues to expand and cool.


How low can the temperature go anywhere in the universe?

The average temperature of the universe now is 2.72548K (the cosmic blackbody radiation of the big bang cooled by expansion). There are places colder, but nothing can be as cold as 0K (absolute zero).


What is the lowest temperature observed in universe?

The lowest temperature observed in the universe is -272.15 Kelvin in the most coolest place of universe "boomerang nebula " also cosmic background radiation approaches this temperature


How the temperature of the Universe dropped after the Big Bang?

The big bang was the BEGINNING of the universe so there was no temperature before it :P


How the temperature of the universe changes after the big bang?

The Universe was at 3000 degrees K at conception, and since then, the universe has expanded by a factor of 1000. The latest revised temperature is at 3 degrees K.


How the temperature of the universe changed after the big bang?

The Universe was at 3000 degrees K at conception, and since then, the universe has expanded by a factor of 1000. The latest revised temperature is at 3 degrees K.


What is the average temperature for a swamp?

The average temperature is here. The average temperature is here.


Which is warmer the average room temperature or the average temperature in Britain?

Average room temperature.


Which planet is the coolest and why?

Uranus, with an average temperature of -355 degrees Fahrenheit and -215 degrees Celsius.


What objects will emit energy in the universe?

Any object in the universe with a temperature above absolute zero


How much degrees is the average temperature of clay cylinders?

Average Temperature The average temperature is 68 degrees Fahrenheit.