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 × 108 m.

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