Practice problem in gravitation for physics students. The problem is the following. The Space Station orbits planet Earth at an average altitude of 406 km. What is the value of gravity at this altitude? Available information: Mass of the Earth: 5.972 x 10^24 kg, Radius of the Earth = 6,370 km, Gravitational constant G = 6.67 x 10^-11 N·m^2/kg^2.