Suppose that future observations with a new telescope reveal a planet about 16 AU from a star whose mass is the same as our Sun's. How long does it take the planet to orbit the star?

By using Kepler's Third Law p^2 = a^3 we plug the numbers in. p^2 = 16AU^3 p^2 = 4096AU

Then by taking the square root on both sides of the equation you get p=64 years.

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