A common explanation for the origin of (some) color is that a material absorbs a, say, red photon and an electron moves from one energy level to a higher energy level, the difference in energy being the energy of the red photon. The material then appears bluish having absorbed the red light...
All bodies with a temperature emit electromagnetic radiation also known as thermal radiation or blackbody radiation. If I understand it correctly, the origin of this is the thermal motion (acceleration) of the atoms and their included positive and negative charges leads to EM radiation...
I'm trying to understand the origin of thermal radiation. All things with a temperature emit electromagnetic radiation.
Every discussion I've found starts with that as a premise and then goes on to Wien's displacement law and Planck's law, etc which I follow.
But *why* do all things...