by 
Irina3
ANSWERS: 10
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I believe due to its small size, and proximity to other smaller "planets" similar to it ...
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There have recently been a number of discoveries of other things sufficiently like Pluto that, if Pluto is a planet, then they are too. So the International Astronomical Union had to make a decision. They could have decided: 1. All these other tings are plantes, so the solar system has at least 12 planets, (The usuals, plus Ceres and "Xena"), and expect a crowd more any day now as telescopes get better. 2. Pluto is a planet becasue it always was, for sentimental reasons, and these new ones aren't becasue we say so. 3. Pluto is not a planet, but just another so-called "Kuiper Belt Object" - and then, of course, neither are all the other Johnny Come Latelies. The rules to be a planet are now: 1. In orbit around a sun. 2. Not a sun itself (i.e. not part of a double star) 3. Big enough to sweep all the debris out of its orbit Pluto fails test 3, and is demoted.
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Scientisits pick on the small! I mean, yes, it 'doesn't follow the same structure or rotation patterns of the other planets', seeing as it seems it is just a load of ice with an orbit, but it's been considered a planet for years! I'm taking my GCSE's soon, they'll muck it all up! Gits!
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disney characters just arn't as popular as thay once were!!
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Because Disney hired him to be Mickey's dog.
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Because it's too small. If we classed eveything like Pluto as a planet we'd end up with a ridiculous number of planets, all with stupid names like Ub292QW.
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It's not???!
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What Is a Planet Today? According to the new definition, a full-fledged planet is an object that orbits the sun and is large enough to have become round due to the force of its own gravity. In addition, a planet has to dominate the neighborhood around its orbit. Pluto has been demoted because it does not dominate its neighborhood. Charon, its large "moon," is only about half the size of Pluto, while all the true planets are far larger than their moons. In addition, bodies that dominate their neighborhoods, "sweep up" asteroids, comets, and other debris, clearing a path along their orbits. By contrast, Pluto's orbit is somewhat untidy. http://news.nationalgeographic.com/news/2006/08/060824-pluto-planet.html
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Because a bunch of scientists got together to try to come up with a more comprehensive list of criteria for what makes a planet, and Pluto didn't qualify. It's now considered a "dwarf planet", or a Kuiper Belt Object (KBO).
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I don't care what people say :'( I think pluto is a planet!! it's annoying when people change their minds on things over the years! :(
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