Interestingly, stars and black holes are also black bodies according the Leonard Susskind, THE BLACK HOLE WAR, 2008. (This means both are excellent absorbers of electromagnetic radiation.)
He also says, page 171,referring to more prosaic materials as water or air:
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The subtleties of quantum fluctuations are on the edge of "explainability"...without complex math...Quantum Field Theory suggests....thermal fluctuations are due to the presence of real photons, photons that bombard our skin and transfer energy to it....quantum fluctuations are due to virtual photon pairs which are created, then quickly absorbed back into the vacuum.
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On page 171 he provides a Feynman diagram of such phenomena.