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A rocky chunk orbits with a semimajor axis of 3 astronomical units. Its orbital period is about:
A5.2 years
B3.2 years
C9.2 years
D1.2 years
Answer & Solution
Correct answer: A. 5.2 years
1. Cube 3 to get 27.
2. The square root of 27 is about 5.2.
3. The period is about 5.2 years.
_Source: OpenStax Astronomy 2e, Chapter 3, Orbits and Gravity._
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