Neptune

Neptune is the farthest planet from the Sun (excluding the dwarf planets Eris and Pluto) in our solar system. It is named for the Roman god of the sea and is 17 times more massive than Earth. Neptune orbits the Sun at 30 times the distance of the Earth. Neptune has 13 total moons (its largest being Triton) and has been visited by one spacecraft, the Voyager 2, in 1989. While considered a gas giant, Neptune (and Uranus) has an "icier" composition of water and methane, naming it an "ice giant" as well as a gas giant. The reason the planet appears blue is because there are traces of methane in the planets atmosphere.