Neptune's years are 164.8 Earth years. Its days are 16 hours and 6.7 minutes long. Although Neptune's days are shorter than our days, its years are still longer than ours.
4.5 billion years, like the rest of the solar system
It is 4.5 billion years old, just like the solar system it self.
The planet Neptune is about four and a half billion years old.
old
The Neptunes was created in 1990.
neptunes gravity is high
neptunes size is 12% grater then the earth
no
hydrogen and helium
It was discovered in 1846.
It is black!!
gas
Hera & Zeus
White
triton
?