In Roman mythology, the god of the sea, equivalent of the Greek Poseidon.
(Roman mythology) God of the sea; counterpart of Greek Poseidon.

A giant planet with a ring of ice particles; the 8th planet from the sun.
In astronomy, the eighth planet in average distance from the Sun. It is a giant gas (hydrogen, helium, methane) planet, with a mass 17.2 times that of Earth. It has the highest winds in the Solar System.
Mean distance from the Sun 4.4 billion km/2.794 billion mi
Equatorial diameter 48,600 km/30,200 mi
Rotation period 16 hr 7 min
Year 164.8 Earth years
Atmosphere Methane in its atmosphere absorbs red light and gives the planet a blue coloring.
Surface hydrogen, helium and methane. Its interior is believed to have a central rocky core covered by a layer of ice.
Satellites Neptune has three faint rings and of its eight moons, two (Triton and Nereid) are visible from Earth. Six were discovered by the Voyager 2 probe in 1989, of which Proteus (diameter 415 km/260 mi) is larger than Nereid (300 km/200 mi).
Neptune was located 1846 by German astronomers J G Galle and Heinrich d’Arrest (1822–1875) after calculations by English astronomer John Couch Adams and French mathematician Urbain Leverrier had predicted its existence from disturbances in the movement of Uranus. Voyager 2, which passed Neptune in Aug 1989, revealed various cloud features, notably an Earth-sized oval storm cloud, the Great Dark Spot, similar to the Great Red Spot on Jupiter, but images taken by the Hubble Space Telescope 1994 showed that the Great Dark Spot has disappeared. A smaller dark spot DS2 has also gone.