Twin City Amateur Astronomers


  Neptune by Voyager 2
Overview Facts and Figures Mission to Neptune Moons
The eighth planet from the Sun is a gaseous orb that has a diameter the is 8-times that of the Earth.

It has 15-times more mass compared to the Earth and is composed of water, ammonia and methane ices.

Visited by Voyage 2 in 1989, Neptune's atmosphere shows visible weather patterns. The composition is mostly hydrogen and helium with traces of methane. The 'Great Dark Spot' attests to some of the high velocity winds.

Neptune is named after the Roman god of the sea.