gives the value for luminosity for a black body, an idealized object which is perfectly opaque and non-reflecting:

where A is the surface area, T is the temperature (in kelvins) and is the Stefan-Boltzmann constant, with a value of

Imagine a point source of light of luminosity that radiates equally in all directions. A hollow sphere centered on the point would have its entire interior surface illuminated. As the radius increases, the surface

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