cross-posted from: https://feddit.uk/post/44126927
Goldilocks
this post was submitted on 12 Feb 2026
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Can't ignore bosons; photon wavelength is a measure of temperature too.
Space has a temperature, which is based on the average of incoming radiation through that space; i.e. the thermal equilibrium to emit as much energy as is absorbed by a theoretical perfectly thermally conductive black body at that point in space.
Based off CMB radiation, space on average is a little over 2.7 kelvin. It'll be hotter near stars, but the void dwarfs matter on a cosmic scale
TIL.
I guess it depends on definition of the word "temperature".
I was referring to the classical definition
https://en.wikipedia.org/wiki/Temperature