|Mass:||86.81 x 10 24|
|Max distance from sun:||4.54 billion kilometers|
|Min distance from sun:||4.46 billion kilometers|
|Length of day:||17 hr. 6 min|
|Length of Year:||165 Earth years|
|Surface Gravity:||11.77 m/s2 (1.2 of Earth's).|
|Axial title:||29° 36'|
|Satellites:||8 - Triton , Despina, Galatea, Halimede ....|
Neptune has a methane atmosphere that reflects blue very well giving it a characteristic bright blue colour. Occasionally white clouds appear on the surface of the planet but otherwise it looks very tranquil. The truth, however, is that the surface is in a very agitated state having winds in excess of 2000 kph. A large dark area was discovered and named the Great Dark Spot, which rotated once every sixteen days.
Neptune was only discovered in 1846 as a result of its gravitational effect on neighbouring Uranus.
Neptune has a mantle made up of ice that surrounds an iron core. The atmosphere is mainly hydrogen, helium and methane.
Neptune as some faint rings made up of mainly icy dust.