How cold is space? Physics behind the universe’s temperature

Though sci-fi movies would have us believe that space is incredibly cold — even freezing — space itself isn’t exactly cold. In fact, it doesn’t actually have a temperature at all.

Temperature is a measurement of the speed at which particles are moving, and heat is how much energy the particles of an object have. So in a truly empty region space, there would be no particles and radiation, meaning there’s also no temperature.

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