An intergalactic spaceship arrives at distant planet that rotates on its axis with period of T. The spaceship enters gcosynchronous orbit at distance of R, R M Othcevpertta com 50 % Part (a) From the given information write general expression for the mass of the planet in terms of G and the variables from the problem statement. Part (b) Calculate the mass of the planet in kilograms if T = 27 hours and R = 21x 108