6. Write down the Kepler's 3rd law ___(7)___, the law of periods, for a planet circulating around its sun (mass M) with a radius r. Use T and G to denote its period and the gravitational constant, respectively.
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6. Write down the Kepler's 3rd law ___(7)___, the law of periods, for a planet circulating around its sun (mass M) with a radius r. Use T and G to denote its period and the gravitational constant, respectively.