Planet Pluto
Category : Solar System Tags : history planet
| Planet Name | Pluto |
| Diameter | 2306 km |
| Circumference | 7,247 km |
| Mass | 1.3 E+22 kg |
| Distance from Sun | 5,906 million km (49 AU) |
| Rotation period | unknown |
| Orbit period | unknown |
| Satellite | 3 |
| Surface Temp | -218 C to -240 C |
| Composition | Nitrogen, Methane |
Pluto is once considered as one of the planet in our Solar System. Discovered in 1930, this little planet has been reclassified into a dwarf planet in 2006 after the International Astronomical Union formalise the definition of a planet.
According to the definition of a planet, there are three major condition a planet need to meet which include;
1. The planet must orbit around Sun.
2. The object must be massive enough and have enough gravity to hold itself into a spherical form.
3. It must have cleared the neighborhood around its orbit. (Pluto failed to meet this third condition).
Pluto is not the largest object in the outer region of the Solar System, in fact another dwarf planet, Eris which lies in the outer region of the Solar System is even larger that Pluto.
List of Moons orbiting Pluto
| Moon | Diameter (km) |
| Charon | 1172 |
| Nix | 46 |
| Hydra | 61 |
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