Why is Pluto not a planet any more?

Answer

Pluto was declassified as a planet in 2006 for a few reasons. One was that the orbit of Pluto was extremely erratic. Most other planets have an orbit that can usually be predicted. Another is that there have been many dwarf planets discovered recently, one of them being even larger than Pluto.
Q&A Related to "Why is Pluto not a planet any more?"
Pluto is not a full planet any more because it has not cleared its orbit of smaller objects. As Pluto is the largest know object in the Kuiper Belt it has not cleared the area. Bizarrely
http://www.ask.com/web-answers/Science/Other/why_i...
because it is too little.
http://wiki.answers.com/Q/Why_is_Pluto_no_planet_a...
Because of its small size and irregular orbit, Pluto was formally classified as a
http://www.chacha.com/question/why-is-pluto-not-a-...
This is because, Pluto fails to meet the specific requirements of being a planet. Pluto, named after the Roman God of the Underworld.
http://www.kgbanswers.com/why-is-pluto-not-a-plane...
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