Question
Compared to the Earth, Neptune is approximately 30 times farther away from the Sun. Its period of revolution around the Sun (in Neptune years) would be
The correct answer is
1
Understanding Neptune's Revolution Period
The question asks for Neptune's period of revolution around the Sun specifically measured in units of Neptune years.
Definition of a Planetary Year
- A "Neptune year" is defined as the time it takes for Neptune to complete one full orbit (revolution) around the Sun.
- By definition, any planet's period of revolution, when measured in its own years, is always equal to 1.
Neptune's Orbital Period
Therefore, Neptune's period of revolution around the Sun, measured in Neptune years, is 1.
The information about Neptune being approximately 30 times farther from the Sun than Earth relates to calculating Neptune's orbital period in Earth years using Kepler's Third Law ($T^2 \propto a^3$), which would yield approximately 165 Earth years. However, this calculation is not needed because the question specifies the unit as "Neptune years".
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