The Schwarzschild radius is the distance from an object at which the escape velocity is equal to the speed of light. A black hole is an object that is smaller than its Schwarzschild radius, so not even light itself can escape a black hole. The Schwarzschild radius r depends on the mass m of the black hole according to the equation r = where G = 2Gm c2 6.673 10-11 N-m/ kg is the gravitational constant and c = 2.998 108 m/s is the speed of light. Consider a black hole with a mass of 5.50 107 Mo. Use the given equation to find the Schwarzschild radius for this black hole. Remember that 1 Mo = 1.989 1030 kg and Schwarzschild radius: m 1 N = 1 kg m/s What is this radius in units of the solar radius? Remember that 1 Ro = 6.955 108 m. radius: Ro