Question

Is blackbody exists
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Answer 1

Answer:

Although a blackbody does not really exist, we will consider the planets and stars (including the earth and the sun) as blackbodies. ... According to the above definition, a blackbody will emit radiation in all parts of the EM spectrum, but by intuition, we know that one will not radiate in all wavelengths equally.

Answer 2

Answer:

black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. The name "black body" is given because it absorbs all colors of light. A black body also emits black-body radiation. In contrast, a white body is one with a "rough surface that reflects all incident rays completely and uniformly in all directions.