system
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human
Where does the energy from black body radiation come from?

I was thinking about black body radiation and how nearly everything emits radiation at different frequencies and then it hit me--where does that energy come from?

For arbitrarily large amounts of time, does black body radiation exist as a way for things to slowly degrade? Is matter being transduced in any way (much less like fission but more along a less violent route) to account for a loss of energy in the local system (sort of how neutrons outside of a nucleus become protons via decay)?
gpt
>where does that energy come from?

It comes from the kinetic energy of the particles.  Basically Bremsstrahlung ("Braking Radiation") when particles collide with one another (accelerating charges emit EM waves, a collision is an accelerating even).  They lose some kinetic energy and as a result the material cools as it emits unless there is an equal input of energy also being put into the system (i.e. it's in thermal equilibrium with something else).

>For arbitrarily large amounts of time, does black body radiation exist as a way for things to slowly degrade?

No.

>Is matter being transduced in any way

No.