Answer to Question #55045 in Astronomy | Astrophysics for Lia

Question #55045
Describe a simple thought experiment to prove that blackbody radiation is isotropic; that is,
the observed spectral brightness of a blackbody disc is independent of its orientation.
1
Expert's answer
2015-10-05T00:00:44-0400
If the blackbody was not isotropic, we could use lenses, mirrors etc., to collect the radiation in the ‘bright’ direction and redirect it onto the ‘dim’ direction (or location) on the blackbody. Since this would put more energy into the object, it wouldn't be in thermal equilibrium anymore.

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