If space is a vacuum, how is the temperature in space on average °2.7 Kelvin and not °0 Kelvin?
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A perfect vacuum has no temperature. It’s not zero degrees or otherwise. It’s a zero divided by zero error.
That said, there absolutely is (a tiny bit of) matter in space, and if we treat space as a photon gas then that has temperature too, with heat coming from sunlight.
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