Newton?s universal constant of gravitation is G = 6.67 ? 10-11 meters cubed (m3)per kilogram per second per second. The Sun?s mass is M = 1.9891 x 1030 kilograms.Earth?s orbital period is P = 365.256366 days. Derive the average radius of Earth?s orbitin kilometers using an equation from your notes or textbook? Write out the derivation.