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MCQIntermediateOrbits, Gravitation & Dynamics
IAAC — 2021 Final Round
Question 16
In a far-away solar system, a planet circles the main star with an orbital period of 100 days and a semi-major axis of 2 AU. Another planet with a semi-major axis of 8 AU is observed in the same solar system. What is the orbital period of the new planet?
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Source
Source: International Astronomy and Astrophysics Competition (IAAC), Final Round 2021. Question wording and answer-choice text are transcribed from the official training PDF; the explanation and metadata are original.