I know that a black body is an idealized body that absorbs all the incident EM radiation. And I also know that the BB emits a spectrum of thermal radiation that depends on its temperature. What I cannot understand is the re-emission. For what i've read, when in thermal equilibrium, a BB absorbs and re-emits continuously all the incident radiation. Is that right? So, when in thermal equilibrium, if a black body absorbs visible light, then why doesn't it re-emit visible light?