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?"
As telescopes have become better and better, scientists have discovered vast numbers of objects floating through space. They range from really big things like Jupiter to really small
http://wiki.answers.com/Q/Why_is_Pluto_is_not_a_pl...
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...
The International Astronomical Union decided that Pluto was no longer a planet. Instead, they decided to classify it as a "dwarf planet" See the details below. RESOLUTION
http://answers.yahoo.com/question/index?qid=200611...
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