The radius of the event horizon (proportional to the mass) is very small, only 30 kilometers for a non-spinning black hole with the mass of 10 Suns.The more precise name for the event horizon is the Schwarzschild Radius, named after Karl Schwarzschild. The formula for the Schwarzschild Radius is Rs = 2GM/c^2. “G” represents the gravitational constant (6.67 x 10^-11 m^3/(kg x s^2), “M” is the mass of the black hole, and “c” is the speed of light (3 x 10^8 m/s).The Schwarzschild radius of the supermassive black hole at the Galactic Center of the Milky Way is approximately 12 million kilometres. Its mass is about 4.1 million M .The Schwarzschild radius or the gravitational radius is a physical parameter in the Schwarzschild solution to Einstein's field equations that corresponds to the radius defining the event horizon of a Schwarzschild black hole. It is a characteristic radius associated with any quantity of mass.
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