Black bodies are good absorbers, but poor radiators of heat.

Yes, that is indeed correct.

A black body is an idealized physical body that absorbs all incident electromagnetic radiation. The thermal radiation from a black body is energy converted electrodynamically from the body 's pool of internal thermal energy at any temperature greater than absolute zero. It is called blackbody radiation and has a frequency distribution with a characteristic frequency of maximum radiative power that shifts to higher frequencies with increasing temperature.

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