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

While science fiction movies would have us believe that space is incredibly cold — even freezing cold — 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 how much energy an object’s particles have. So in a really empty region-space there would be no particles and radiation, meaning there would be no temperature either.

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