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The period of an object at a distance of 1 AU from the Sun is one year. We know that, because that's Earth.

By Kepler's Third Law, something at four times the distance would have a period of the square root of the cube of 4, or the square root of 64, or, to put it simply, 8... times as long.

So, 8 years.

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Q: What is the orbital period of an object at a distance of 4 AU from the sun?
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