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Cavity-enhanced spectroscopies. Guthrie from Annalen der Physik : , : G. There is interest in blackbody-like materials for camouflage and radar-absorbent materials for radar invisibility. A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation , regardless of frequency or angle of incidence. Radiative Processes in Astrophysics. Introduction to astronomical photometry. See also: Hawking radiation.

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