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I thought that Pluto is a planet in the solar system. If not, what makes it not a planet then?

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Pluto was a planet but no longer considered, it's known as the dwarf planet. The reason it's no longer considered a planet is because it took a shorter route to orbit the sun, all planet have their route but Pluto instead of moving on its  lane ,it entered into the lane of others, therefore getting itself disqualified..For any heavenly body to be a Planet there are a few requirements..

And Pluto just disobeyed :)
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I think you did a great job in explaining it. It seems I need to consider this answer of yours. I am sure people will be enlightened by your explanation.
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I have explained very clear but I have to do a research to agree with your answer.
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No. Pluto is a dwarf planet because it isn't adequately large to apply its orbital predominance and clear the area encompassing its circle.
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I am a bit confused because you described it as a dwarf planet. During my high school days, my science teacher said that it is a part of the solar system, right?
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Si es un planeta el más diminuto de nuestro sistema solar está ubicado al lado del planeta neptuno carece de vida dentro de su atmósfera ningún ser viviente podría vivir bajo esas condiciones sin oxígeno y sobre por sus bajas temperaturas.

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Estoy de acuerdo  en que no hay ningun planeta en el que podamos vivir hasta la fecha . Espero que pudieramos hacerlo porque La Tierra esta superplopada ahora.
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Pluto is not a planet because of its size if it was larger it would be, because Pluto is too small to be a planet it is classed as a Dwarf planet
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I got it. Some scientists considered as a planet but not officially included in the solar system. I hope it could lay down the real fact about it.
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I don't agree with you,I think I have to do some research to verify whether is true or not.
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Yes. It is a dwarf planet but it is still considered a planet by NASA though it's distance makes it harder to know more about it since its discovery 91 years ago.
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I also it is still considered a planet but not in the solar system anymore.
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Pluto is a planet yes. IT was discovered in 1930.It was declared the ninth planet from the sun. So answer is yes ,Pluto is a planet.
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Are you sure? I think it is not included in the solar system now, right?
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Pluto was a planet. But recently, it turned out that planet pluto expired because it lost its track from the elliptical orbit that it was supposed to follow to sustain itself in solar system. 
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It means that Pluto is not moving in space now, right? It seems I need to check further about it.
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What I Know is that Pluto is a planet and if recently it has turned out not to be planet am aware.
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Pluto is not considered as a planet now it was considered as a planet before but now it is not considered because it was a planet which was very small as compared to other planets
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Pluto is no longer a planet because it doesn't fit the definition planet given by international astronomical unit. The astronomical body that posses following qualities is a planet according to international astronomical unit:

  • The astronomical object is orbiting a star(sun in our solar system)
  • The gravity of this astronomical object must be enough to put the object into spherical shape. 
  • The astronomical object is large enough to have a gravity that sweeps off other objects of similar size near its path.''
Pluto doesn't fulfill the last requirement so, it's a dwarf planet. 
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Pluto is a planet.In the universe there are nine planets of different size and shape .each planet has different diameter and rotates different distance on the sun.
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Pluto is as per now not classified as a planet because as much as it is large enough to become spherical, it is not big enough to exert its orbital dominance. According to IAU, there are three criteria they use in order to vote in a celestial body as a planet. They celestial body must make sure that;

1. It is in orbit around the sun

2.It has sufficient mass to assume hydrostatic equilibrium

3.It has cleared the neighborhood around its orbit

Pluto has only met two of them leaving out the third. Therefore, it does not qualifies to be a planet until it changes on its gravitational dominance.
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No, Pluto is not considered a planet in the solar system. In 2006, the International Astronomical Union (IAU) established a definition of a planet that excluded Pluto due to its size and orbit. According to the IAU, a planet must have enough gravity to become spherical, must orbit the sun, and must have cleared its orbit of other objects. Pluto does not meet these criteria, so it is not considered a planet.
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Pluto was a planet but no longer considered, it's known as the dwarf planet. The reason it's no longer considered a planet is because it took a shorter route to orbit the sun, all planet have their route but Pluto instead of moving on its lane ,it entered into the lane of others, therefore getting itself disqualified..
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The reason it's no longer considered a planet is because it took a shorter route to orbit the sun, all planet have their route but Pluto instead of moving on its lane ,it entered into the lane of others, therefore getting itself disqualified..For any heavenly body to be a Planet there are a few requirements..
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