| Average Distance From Sun: | 5900 Million KM |
| Diameter: | 3000 KM |
| Mass: | 0.0025 Earth Standard |
| Gravity: | 0.2 Earth Standard |
| Atmosphere: | Methane |
| Moons: | One, Charon |
| Pluto Year: | 248 Earth Years |
| Pluto Day: | 6.5 Earth Days |
Pluto is the smallest and, usually, outermost planet of the solar system.
The existence of Pluto was predicted by calculation by Percival Lowell and the planet was located by Clyde Tombaugh 1930.
Pluto's highly elliptical orbit occasionally takes it within the orbit of Neptune, such as 1979-99. It is of low density, composed of rock and ice, with frozen methane on its surface and a thin atmosphere. Charon, Pluto's moon, was discovered 1978. It is about 1,000 km in diameter and orbits the planet at a height of about 20,000 km every 6.39 days - the same time that Pluto takes to spin on its axis. Some astronomers have suggested that Pluto was a former moon of Neptune that escaped. Charon remains permanently above the same place on Pluto.
Pluto has recently retaken its posision as furthest planet from the Sun, (a position it swaps occasionaly with Neptune, as their orbits overlap).