Discovery Neptune was discovered by Galileo Galilei, but he thought that Neptune was a star. Neptune was localized by Galle and d’Arrest in 1846. Then, many people given the discovery to Galle.
Naming First, a few years after Galileo founded Neptune, this one was called “the planet exterior to Uranus”. After that, Galle and Challis suggested the names of Janus and Oceanus, respectively. Then Friedrich von Struve suggested the actual name in honour of the roman god of the sea, in 1846.
Internal structure The internal structure of Neptune not differ greatly from that of Uranus. Neptune have a solid core mass similar to that of the earth, comprising a mixture of ice and various silicates, surrounded by a layer rich in methane and ammonia water to which overlaps an atmosphere comprising hydrogen, helium and methane.
Atmosphere The atmosphere of Neptune is buffeted by strong winds that are known and could reach 2000 km / h. Like the other gas giants, the winds are usually confined to well-defined bands between latitudes. They also are huge storms (vortices) located, similar to Jupiters Great Red Spot.
Space Missions Neptune was visited only once and it was by NASA’s spacecraft Voyager 2, on August 25, 1989. The spacecraft verified the existence of a magnetic field surrounding the planet and discovered that the field was offset from the centre and tilted in a manner similar to the field around Uranus. The question of the planets rotation period was settled using measurements of radio emissions. Voyager 2 also showed that Neptune had a surprisingly active weather system. Six new moons were discovered, and the planet was shown to have more than one ring.