Most stars radiate much like black bodies. Consider two stars having the same surface temperature, the second having 10 times the diameter of the first. The power radiated per unit area is

Question

Quizplus · Accepted Answer

The power radiated per unit area by a black body is given by the Stefan-Boltzmann law, which depends only on the temperature of the object's surface, not its size. Since both stars have the same surface temperature, the power radiated per unit area will be the same for both.

Most Stars Radiate Much Like Black Bodies