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A planetary system consists of a massive star, a planet at distance R 0 from the star, and a second planet at a distance 2R

A planetary system consists of a massive star, a planet at distance R0 from the star, and a second planet at a distance 2R0 from the star. Both planets are in circular orbits around the star. Let's call T2 the period of the outer planet and T1 the period of the inner planet. What is the ratio of these periods?

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