The answere is planet neptune,
the reasons are that neptune has 165 days because is the 8th planet from the sun what it means that is the last planet in the solar system and earth is the 3rd one so it has less days than neptune and if neptune is the last planet thats why it has 165 days.
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i descover it on Google
this answeres are from:
ms.AFC
Neptune is the planet with a year 165 earth years long.
It is 84 Earth years
It is one mercury year long
uranus
Saturn. Its orbital period of the sun is around 29.4 years.
There are no planets with a 29-day year. The shortest year is for Mercury, the closest planet to the Sun, taking 88 Earth days for one revolution.The planet with a year about equal to 29 Earth years is Saturn, which takes about 29.456 Earth years to travel once around the Sun.
The dwarf planet Pluto is the planet with a year 248 earth years long.
The dwarf planet Haumea is the planet with a year 280 earth years long.
The dwarf planet Makemake is the planet with a year 310 earth years long.
Mars.
It is 84 Earth years
The dwarf planet Eris best fits this description, with a year about 561 years long.
It is one mercury year long
neptune
Uranus.
uranus
11.68 years
The dwarf planet, Pluto, has a year of 247.9 Earth years.