The term dwarf planet was established by the International Astronomical Union (IAU) to define a new class of celestial bodies, which is different from the planet and the minor planet body. This was incorporated in the resolution of the UAI on August 24, 2006 on the definition of planet for the bodies of the solar system. According to the UAI, a dwarf planet is considered to be that celestial body that: is exorbitant around the Sun. In addition, it has enough mass so that its own gravity can overcome the force of a rigid body, which allows it to acquire a hydrostatic equilibrium. It should be noted that these bodies are not satellites of a planet or other non-stellar body.
For astronomers, a dwarf planet is any celestial body that is revolving around the sun. However, this is not enough to consider it as such, since a planet is considered a dwarf if it also has enough mass for its gravity to acquire an almost spherical shape. Simply put, if a planet has an irregular shape it cannot be considered a dwarf planet.
A distinctive feature of dwarf planets is that they only need to be orbiting one star. On the other hand, it will be understood that a planet is dwarf if it has not cleared the vicinity of its orbit, that is to say that the planet revolves around the Sun accompanied by other celestial bodies that perform the same orbit. This characteristic is relevant since thanks to it the planet Pluto ceased to have its name as a planet and astronomers classified it as a dwarf planet in the year 20006.
When the formation of the planets occurred, it occurred within a nebula in which there were a large number of bodies. The planets were growing through the attraction gravitational: attracting to them what was around and that increased so its size and mass objects hitting him, to such a point that at the end there was nothing near their orbits. For its part, a dwarf planet is one that did not achieve this. Since a true planet, it does not possess debris from its formation.
