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Which planet has the longest year in the Solar System?
SpacePlanets
Quick Answer
Neptune has the longest year of any planet, taking about 165 Earth years to orbit the Sun once. That means it has completed only one orbit since it was discovered.
The Full Story
Neptune is the planet with the longest year, because it is the farthest of the eight major planets from the Sun. One Neptune orbit takes about 165 Earth years. Since Neptune was discovered in 1846, it has completed just over one full orbit since then. Its slow motion reflects both its great distance and the much weaker pull of the Sun at that range.
Key Facts
1.Neptune year: about 165 Earth years
2.Farthest major planet from the Sun
3.Discovered in 1846
YouTube Angle
Suggested video title for this topic:
"One year on this planet lasts longer than a human lifetime."