Pluto ( minor planet designation : 134340 Pluto ) is an icy dwarf planet in the Kuiper belt, a ring of body beyond the orbit of Neptune. It was the first and largest Kuiper belt object to be discovered.
Pluto was discovered by Clyde Tombaugh in 1930 and declared to be the ninth planet from the Sun. After 1992 its status as a planet was questioned following the discovery of several object of similar size in the Kiuper belt. In 2005 Eris, planet in the the scattered disc which is 27 % more massive than Pluto was discovered . It is the ninth largest and tenth most massive known object directly orbiting the Sun is the largest known Trans-Neptunian object by Value but it is is less massive than Eris. Like other kuiper belt object Pluto is primarily made up of Ice and Rock and is relatively small one sixth the mass of the Moon and one third its volume.
It has moderately eccentric and inclined orbit during which it ranges from 30 to 49 astronomical units or AU ( 4.4 to 7.4 billion km ) from the Sun. This means that Pluto periodically comes closer to the Sun than Neptune, but a stable orbital resonance with Neptune preventsfrom colliding. Light from the Sun takes 5.5 houra to reach on Pluto. Pluto is the largest known dwarf planet in the Solar System, discovered in 1930. It was thought to be the ninth planet of our solar system for 75 year until the discovery of Eris and other similar object that led to its demotion from the planet to drawf planet in 2006.
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