If space is a vacuum, how is the temperature in space on average °2.7 Kelvin and not °0 Kelvin?
In: 4
the temperature relates to the leftover temperature from the big bang, and it’s the flood of electromagnetic radiation that permeates all of space. this is photons that are still filling all of space and preventing anything in from cooling to absolute zero. (although it’s not possible to get absolute zero in reality, it can get closer than 2.7K)
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