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.
Q&A Related to "Why is Pluto not a planet?"
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
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After Pluto was discovered in 1930, astronomers continued to learn more about the planet, and they decided that Pluto was too small to qualify as a planet in our solar system. Even
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A planet is a large body of rock or gases. Even though Pluto looks small, it isn't. In fact, Pluto is 1,500 miles across. Pluto is made out of frozen gases.
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Planet redefined to mean object that orbits sun & is large enough to become
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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 classified as a dwarf planet, because the International Astronomical Union changed its classification in 2006. I will forever remember Pluto as a regular ...
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 ...
Pluto is no longer considered as a planet because it doesn't attain necessary requirement needed to be a planet. One of the conditions for being classed as a planet ...
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