The dwarf planet Pluto has an average orbital radius of 40 AU. Using Kepler's third law of planetary motion, what is Pluto's orbit in Earth-years?
Pluto's period is 253 years using Kepler's third law.
In our solar system, anything orbiting the Sun obeys a simplified form of Kepler's third law if the period
If Pluto has a semi-major axis distance
The actual period os Pluto is 248 years which is close.