An intergalactic spaceship arrives at a distant planet that rotates on its axis with a period of t. the spaceship enters a geosynchronous orbit at a distance of r. a. From the given information, write a general expression for the mass of the planet in terms of G and the variables from the problem statement. b. Calculate the mass of the planet in kilograms if T = 26 hours and R = 2.1 × 10^8 m.