Suppose a planet orbits a nearby star once every 125 years. If the star is identical to the sun, how could you find the planet's distance from its star? If the planet's orbit is a perfect circle, how far from the star is the planet in au?
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Use Kepler's 3rd Law: The period of a body orbiting the sun (in years) when squared is equal to the cube of its mean distance from the sun in Astronomical Units. The mean distance in this case would be 25 astronomical units.
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