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The lowest temperature found in outer space is about 3 Kelvin. (This is -270°C or -454°F. 0 Kelvin is absolute zero.) This temperature is caused by cosmic microwave background radiation, which is present in the entire universe. Many parts of space have higher temperatures, because there are some particles present, like gas clouds, planets or stars.

Inside our solar system the lowest temperature is about 40 Kelvin (-233°C / -388°F), because of the presence of particles.
Very cold! Outer space is about 3 degrees Kelvin, which is about -270 degrees Celsius or -454 degrees Fahrenheit! That means it's only a few degrees warmer than the coldest anything can ever get!

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Mark Greenholt

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2y ago

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