Why Is Pluto Not a Planet?

Answer

Pluto is not a planet because it does not fulfil the third criteria which is 'A planet must have cleared out the other objects in its orbit'. In this case, Pluto does not dominate its orbit so therefore it is not considered as a planet.
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Ask.com Answer for: why is pluto not a planet
Pluto does not meet all three criteria that now define a planet. A planet must orbit around the Sun, have sufficient mass to maintain a nearly round shape, and it must have cleared the neighborhood around its orbit.
Pluto has not cleared the neighboorhood around its orbit. It has been reclassified as a "dwarf planet". More >>
As of the year 2006, Pluto was no longer considered a planet because it does not meet one of three main requirements for a space object to be a planet. It was said that Pluto does not 'clear the neighbourhood' of its orbit meaning that it is not the only object in its orbit. For this reason, Pluto was demoted from being a planet to being a dwarf planet.
To be considered a planet, the object needs to meet 3 requirements. After further observation regarding Pluto, it did not meet all 3 of those requirements. So in 2006, Pluto became a dwarf planet. You can find more information here: http://www.universetoday.com/2008/04/10/why-pluto-is-no-longer-a-planet/
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Pluto is no longer considered a planet because it does not dominate its orbit which is a must requirement for a planet. With its moons, Pluto is now part of a ...
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