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One planet has an orbital period 8 times that of another around the same star. Their orbital radius ratio is?
A4 : 1
B2 : 1
C8 : 1
D16 : 1
Answer & Solution
Correct answer: A. 4 : 1
With T^2 proportional to a^3, a ratio = (8)^(2/3) = 4.
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