Neptune

Neptune is the seventh planet from the Sun, the fourth gas giant, and the outermost of the main planets in the Solar System.

Neptune photographed by Voyager 2 in August 1989

Credit: NASA/JPL

Facts About Neptune:

Neptune is the 8th planet from the sun and the 4th largest. It is the outermost known major planet, although it is possible that one or more planets could exist much farther out.
Neptune and Uranus are composed of different chemicals to Jupiter and Saturn. They are sometimes called "ice giants".
Neptune is the most dense of the gas giants.
Neptune is 17 times the mass of Earth, and slightly more massive than Uranus.
Neptune has a blue appearance caused by traces of methane in the planet's atmosphere that absorb red light and reflect blue.
Neptune was the first planet to be discovered using mathematics. French astronomer Urbain Le Verrier calculated its position based on the irregularities of Uranus' orbit.
The fastest wind speed ever recorded was on Neptune: 2,575 km/hr!