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Calculate the period of revolution of an object in the Oort cloud at an average distance of 100,000 AU from the Sun traveling on a circular path.

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Kepler’s third law: p2 = a3

p = period of revolution in years

a = average orbital radius in AU

p2 = 100,0003 = 1015

p = (1015)1/2 = 31.62 × 106y

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