Pluto is the ninth planet in the solar system. It is the farthest from the Sun, which separates the 5.913 million kilometers. This celestial body, 4,800 km in diameter, consists of a mass of frozen methane and surrounded by a thin atmosphere of the gas, mixed with others. The period of rotation about its axis meets in six days and nine hours, while the planet takes 248.5 years to give a return on its movement around the sun's orbit is erratic, and is sometimes confused with Neptune. In mid-2006, a conference of astronomers decided to reclassify Pluto as "dwarf planet", which caused controversy in the international scientific community.
This planet was discovered in 1930 by astronomer Clyde Tombaugh from Mount Palomar Observatory in the United States.
Pluto has one satellite, named Charon, discovered in 1978. its diameter is about 1,160 kilometers.