Black Body
A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. The radiation emitted by a black body in thermal equilibrium with its environment is called black-body radiation.
A few common day examples of black body radiators which utilize their radiation for other processes or emit visible light are: Stoves. Electric heaters. The stars and sun.
We will consider the planets and stars (including the earth and the sun) as blackbodies. Even though by definition,
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