How cold is space? Physics behind the temperature of the universe

Although science fiction movies would have us believe that space is incredibly cold, even freezing, space itself isn’t exactly cold. In fact, it has no temperature at all.

Temperature is a measure of the speed at which particles move, and heat is the amount of energy an object’s particles possess. So, in a truly empty region space, there would be no particles or radiation, which means there is no temperature either.

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