Determining Planet Properties - Ms. Alderson's Earth and ...

He found for any two objects orbiting each other, the sum of their masses, planet mass + moon mass = (4 2/G) × [(their distance apart)3/(their orbital period around each other)2]. Newton's form of Kepler's third law can, therefore, be used to find the combined mass of the planet and the moon from measurements of the moon's orbital period and ... ................
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