On another point if the theory was true you would be able to make a space craft nearly perfectly insulated from losing heat via radiation with just a reflective mylar blanket with the right wavelengths of reflection even if it was receiving no energy from an outside source but clearly that would be a violation of the second law. After the first absorption and re emission there's several orders of magnitude of energy reduction and it would be at a lower energy state than whatever the emitter was so there wouldn't really be a way for it to raise the temperature of the system.
On another point if the theory was true you would be able to make a space craft nearly perfectly insulated from losing heat via radiation with just a reflective mylar blanket with the right wavelengths of reflection even if it was receiving no energy from an outside source but clearly that would be a violation of the second law. After the first absorption and re emission there's several orders of magnitude of energy reduction and it would be at a lower energy state than whatever the emitter was so there wouldn't really be a way for it to raise the temperature of the system.
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