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Kepler's laws of planetary motion

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Two hypothetical planets orbit their star according to Kepler's laws of planetary motion.
If one of the planets has an orbit which has a semimajor axis three time that of the other, then numerically how much greater is it orbital period compared to the other?

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Solution Summary

Kepler's laws of planetary motion are explained.

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According to the question:
a1 = 3*a2
because,
time period ...

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