Back in those blissful bygone days when Pluto was considered a planet, it had the longest years. 1 Pluto Year = 247.7 Earth Years.
With Pluto gone, Neptune now has the longest years. 1 Neptune Year = 164.81 Earth Years. Basically, the further back you go from the sun, the longer the years.
Christian is correct. Interestingly, the planet with the shortest year is in the constellation Cancer. It orbits a star named 55 Cancri and has a year that is equivalent to 17 hours and 41 minutes on Earth.
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