An undiscovered planet, many light-years from Earth, has one moon, which has a nearly circular periodic orbit. If the distance f
rom the center of the moon to the surface of the planet is 2.165×105 km and the planet has a radius of 4175 km and a mass of 6.70×1022 kg , how long (in days) does it take the moon to make one revolution around the planet? The gravitational constant is 6.67×10−11N·m2/kg2 .
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