Planet Pluto

Pluto is the farthest known planet from the Sun. It the only one planet that has not been visited by spacecraft. It has one moon called Charon

Pluto was discovered in 1930 by Clyde W. Tombaugh. The planet is named Pluto after the God of the Underworld in Roman mythology. In Greek mythology the equivallent god is Hades.
Facts about Planet Pluto
* Diameter: 2324 km (1444 miles).
* Surface composition: Nitrogen, carbon monoxide, methane and water ices

* Average surface temperature: -233ºC (-382ºF)

* Mass: 0.002 (Earth = 1)
* Gravity: 0.07 (Earth = 1)
* Average distance from the Sun: 5.9 billion kilometres.

* Rotation Period: 6.39 Earth days (length of day)

* Orbital period around the sun: 248 Earth years (length of year)
* Rings = 0
* Moons =  1
* Average distance between Pluto and Charon: 19,600 Kms
The Orbit of Planet Pluto

Pluto's orbit from the Sun varies from 4.4 to 7.7 billion kms and for the most of its orbit it is the outer most planet. Between 1979 and 1999 Pluto was actually closer to the Sun than Neptune and the closest approach to the sun (perihelion) was in September 1989.

Due to the changes in orbit in time, Pluto has a unique atmsophere that transforms at various stages of its orbit. As its orbit approaches the Sun, its atmosphere begins to form. The frozen atmosphere melts as it comes closer. As Pluto moves further out its atmsophere will freeze