# Kepler's laws of planetary motion

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?

https://brainmass.com/physics/planets/keplers-laws-planetary-motion-11339

#### Solution Preview

According to the question:

a1 = 3*a2

because,

time period ...

#### Solution Summary

Kepler's laws of planetary motion are explained.

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