Kepler’s 3rd law states the square of the orbital period is proportional to the cube of the orbital radius. (T2=r3)If a planet's orbital radius is doubled, what happens to the length of a year on that planet? Kepler's Law

  • It will become twice as long
  • It will become about 8 times as long
  • It will remain the same
Answer: It will become about 8 times as long
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