Find the length of the major axis of Earth s orbit using Kepler s third law and the fact that Earth s orbital period is 365 256 days Use G 6 6726 10 Nm kg M 1 99 x 1030 kg and 3 14 Recall that 1 N 1 kg m s 11 The length of the major axis of Earth s orbit is km Do not round until the final answer Then round to the nearest thousand as needed