| Age |
About the same age as the Sun: 4.5
billion years |
| Location |
Solar system |
| Avg. distance from the Sun |
4,504,000,000 km |
| Length
of day |
18
hours |
| Length
of year |
165
years or 60,150 days |
| Range
of temperature |
-190C |
| Atmosphere |
Composed
of frozen gases - 74% hydrogen, 25% helium, methane |
| Mass |
1.0247 x 1026 kg |
| Period of revolution |
164.8 Earth years (60,150 Earth
days) |
| Number of moons |
Neptune
has 8 known moons: 7 small
ones and 1 large one (Triton), which is almost as large as Earth's
moon. |
| Distinguishing features |
Neptune is smaller in diameter than
Uranus, but larger in mass. It is the first planet found from
calculations based on the observed positions of the other planets.
Because Pluto's orbit is so eccentric, it crosses the orbit of
Neptune, making Neptune the most distant planet from the Sun for a few
years. |
