Chemomechanics t1_jbzkgtc wrote
Reply to comment by superbob201 in If the temperature of a system depends on its average kinetic energy, does it mean the "de facto" temperature depends on the speed of the observer? by Dryu_nya
> As a side note, you would observe blackbody radiation that was red- or blue-shifted depending on your motion that could make the gas appear warmer or cooler.
A hotter or colder body's blackbody radiation isn't simply shifted by a set amount, so this isn't true. You'd identify the same temperature with some overlaid bulk motion. I apologize; my statements were incorrect.
superbob201 t1_jc04vlv wrote
One annoying thing about blackbody radiation is that is still looks like blackbody radiation after Doppler shifting. It's why the CMB has a blackbody temperature of 2.7K, even though it is coming from ionized hydrogen.
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