A new planet is discovered. Planet X is observed to orbit the sun every 300 years. What is the semi-major axis of Planet X's orbit in AU?
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Explanation:
Data yet to be confirmed: Orbit period is about 15000 years, Perihelion = 200 AU and aphelion 600 - 1200 AU. For these tentative (imprecise )data, semi-major axis is half-sum = 400 to 700 AU.
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