Neptune

The last of our four gas giants, Neptune lies 8th from the sun. It is the only planet discovered by prediction of existence, rather than actual sighting. It's components are similar to that of Uranus, and its size varies only a small amount in comparison to its sometimes called "twin". The planet's strong winds measure speeds of up to 1200 km/h, and its temperature is one of the coldest in the solar system due to it's great distance from the sun. Like the other gas giants, it has a subtle ring system, though it is less viewable than the other three planets.
Neptune has only been visited by one satellite, voyager two, so much of the planet is still unknown.




this photo courtesy of NASA