Kepler Science Academy Layyah

What are the particles which do work for attraction of bodies...????

A black body is an idealized physical body that absorbs all electromagnetic radiation falling on it. Because of its perfect absorptivity at all wavelengths, a black body is also the best possible emitter of thermal radiation, which it radiates incandescently in a characteristic, continuous spectrum that depends on the body's temperature. At Earth-ambient, low temperatures this emission is in the infrared region of the electromagnetic spectrum and not visible, and therefore the object appears black, since it does not reflect or emit any visible light.
t is called blackbody radiation and has a distribution with a frequency maximum that shifts to higher energies with increasing temperature. As the temperature increases past a few hundred degrees Celsius, black bodies start to emit visible wavelengths, appearing red, orange, yellow, white, and blue with increasing temperature. By the time an object is visually white, it is emitting a substantial fraction as ultraviolet light.

As the temperature decreases, the peak of the blackbody radiation curve moves to lower intensities and longer wavelengths. The blackbody radiation graph is also compared with the classical model of Rayleigh and Jeans.

How is it constructed?
The concept of the black body is an idealization, as perfect black bodies do not exist in nature. Graphite is a good approximation, however. Experimentally, blackbody radiation may be established best as the steady state equilibrium radiation in a rigid-walled cavity. A closed box of graphite walls at a constant temperature with a small hole on one side produces a good approximation to ideal blackbody radiation emanating from the opening