Pluto

Pluto is named after the Greek God of the under world. Pluto is the only planet in the Solar System which has not been visited by a spacecraft. The orbit of Pluto is the most elliptical of all the planets and in 1989 it was 'perihelion', when it come closer to the Sun than Neptune. Pluto is so small that it is only about one-sixth of the diameter of the Earth. 

Characteristics of Pluto

                                                      Mass : 11.9421kg

                                                      Radius : 1,150 kg

                                                    Mean dansity : 2.0 g