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Is it space hot or cold?

Updated: 8/20/2019
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10y ago

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Space itself has no temperature at all. Only matter can have a temperature; the vacuum of space has no matter, therefore no temperature.

The matter that's IN space, on the other hand.... When exposed in the sunlight, the sunlight can heat things up quite a lot. In shadow, or far from the Sun, heat energy will radiate away into space and the object can get pretty darned cold.

Comments: This is quite a complicated situation.

Even "empty space" is permeated by the "Cosmic Background Radiation".

So, it's usually said that the lowest temperature in space is about 2.7 degrees above "Absolute Zero".

Also, there's a lot of gas and dust spread throughout interstellar space.

There is a large temperature range from just a few degrees kelvin up to thousands of degrees and more.

Generally speaking though, I agree that the stuff in space, away from nearby stars, is usually very cold.

See below for a "related link".

Click on this link and enter :

"temperature of space" in the "search box".

Then click on "What's the temperature of outer space?"

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