"Thermal radiation is electromagnetic radiation generated by the thermal motion of particles in matter. All matter with a temperature greater than absolute zero emits thermal radiation. ...
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Particle motion results in charge-acceleration or dipole oscillation which produces electromagnetic radiation.
The infrared radiation emitted by animals that is detectable with an infrared camera, and the cosmic microwave background radiation, are all examples of thermal radiation.
If a radiation-emitting object meets the physical characteristics of a black body in thermodynamic equilibrium, the radiation is called blackbody radiation. Planck´s law describes the spectrum of blackbody radiation, which depends solely on the object´s temperature. Wien´s displacement law determines the most likely frequency of the emitted radiation, and the Stefan–Boltzmann law gives the radiant intensity." - (en.wikipedia.org 27.11.2019)
