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Pluto has very small area. It looks very small. Hence it is not considered as a Planet. Many bodies having small size are not considered as planet.
http://answers.ask.com/Science/Other/why_does_plut...
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After being classifed as one of the nine planets in the Solar System for over a millennia, Pluto was demoted from being a planet in 2006. In 2006, the International Astronomical Union
http://answers.ask.com/Science/Other/why_pluto_is_...
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Pluto is a dwarf planet that is made out of rock and ice. Originally considered a planet, Pluto is now a dwarf planet, and the largest member of the Kuiper Belt on the edge of the
http://answers.ask.com/Science/Astronomy/what_type...
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Pluto is no longer considered a planet for many reasons. The size of Pluto is smaller than the biggest dwarf planet, and it is more similar to a number of a number of celestial bodies
http://answers.ask.com/Science/Other/why_is_pluto_...
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