Using radiant exitance of Schwarzschild black hole, the radiation spectrums of Fermion field and Boson field of black hole are calculated out, and Wien's displacement laws are also obtained.

For any object, there is a critical radius, called the Schwarzschild radius, at which its mass will form a black hole.

A few months later, Karl Schwarzschild gave the solution for the gravitational field of a point mass, showing that something we now call a black hole could theoretically exist.