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Because it was too small and it seemed to be following some other orbit rather than our sun. Its orbit was off from ours by too much time. It was faster than it should have been. ______________ I considered editing the question, but left it because it might resonate with some popular misconceptions. Pluto is still out there, and our struggles to categorize it have not diminished it one bit. It remains part of our solar system and will remain so as long as the solar system exists, barring some unforeseen disaster. It will continue to be a fascinating and inspiring object and one worth studying. Neither its size nor the speed of Pluto's orbit are factors in Pluto's categorization, although many point out that the region that far out in the solar system seems not to be the right place for a planet so small. That part of the solar system is where the gas giants live, and the smaller more rocky planets live near us. Pluto is simply no longer considered a major planet. It is a minor planet. In order for a body to be considered a planet it must orbit a sun or the remnant of a sun. Pluto does that. It must be large enough so that by force of its own gravity it has formed itself into a sphere-like shape. [Planets are not perfect spheres.] Pluto has done that too. So far so good. It must also have cleared its neighborhood of debris. No planet has done this completely; there are chunks of rock and tons of dust and ice floating around. But the major planets have no objects in the vicinity of their orbits large enough to challenge their primacy in their orbits. Here is where Pluto runs into trouble. Pluto's orbit is roughly 248 earth years. During that time Pluto spends roughly 12-14 years in the part of its orbit that takes it closer to the sun than Neptune, the outermost major planet. The rest of the time it is in what is called the Kuiper Belt, a region beyond Neptune that is filled with icy chunks, some of them rivaling the size of Pluto. Probably many of the comets that we sometimes observe spend most of their time there. In fact, Pluto may be very much like a large comet, and might act like one if it got close enough to the sun. It is all the time that Pluto spends among the many other objects in the Kuiper Belt that disqualifies it from being a major planet. Often, Pluto is referred to as a Kuiper Object. So Pluto fans, do not despair. Pluto is in reality eveything it ever was. We just don't include it on the list of major planets any more.

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When did scientists describe Pluto as a dwarf planet?

In 2006 the Astronomical Union defined 'planet' and the definition excluded Pluto. At the same time they created the term dwarf planet into which Pluto fell.


Why Pluto is excluded as a planet by international astronomical union?

Pluto's classification was changed by the International Astronomical Union in 2006 because its small size and orbit do not meet the criteria for a full-fledged planet. Pluto was reclassified as a "dwarf planet" due to these discrepancies.


When was Pluto excluded from the list of planet?

Pluto was excluded from the list of planets in 2006 after the International Astronomical Union (IAU) released it's decision on what defines a planet. In sum, the IAU now defines a planet as being a celestial body within a solar system that: 1. orbits the sun 2. is large enough to form into a round-ish shape 3. has "cleared the neighbourhood" of it's orbit Since Pluto did not meet the third criteria, it can no longer be considered a planet.


What planet of the solar system is exception?

Pluto is often considered an exceptional planet as it was reclassified as a dwarf planet by the International Astronomical Union in 2006 due to its small size and different orbit compared to the eight classical planets.


Is Pluto has gone to black hole it is true or false?

False. Nothing actually happened to Pluto itself. All that has happened is that, after discovering several new Pluto-like objects, scentists came up with a new definition for a planet that excluded Pluto.

Related Questions

When did scientists describe Pluto as a dwarf planet?

In 2006 the Astronomical Union defined 'planet' and the definition excluded Pluto. At the same time they created the term dwarf planet into which Pluto fell.


Which planet has been excluded and why?

Pluto has been excluded because to be a planet, you have to be able to: orbit the sun, have enough mass to assume a rounded shape, and clear any objects in it's path. Pluto however, does not fit the criteria above, so is now called a Dwarf Planet. hope this has helped! :)


Do the planet Pluto is in the solarsystem?

If your question is "is Pluto a part of the solar system" then the answer is Yes. s Pluto, may have been excluded from the list of planets, but is now a dwarf planet. We have other dwarf planets too like Eris and Ceres


When was Pluto classifed as a dwarf planet?

On August 24, 2006, the International Astronomical Union (IAU) defined the term "planet" for the first time. This definition excluded Pluto as a planet, and added it as a member of the new category "dwarf planet" along with Eris and Ceres.


Why Pluto is excluded as a planet by international astronomical union?

Pluto's classification was changed by the International Astronomical Union in 2006 because its small size and orbit do not meet the criteria for a full-fledged planet. Pluto was reclassified as a "dwarf planet" due to these discrepancies.


When was Pluto excluded from the list of planet?

Pluto was excluded from the list of planets in 2006 after the International Astronomical Union (IAU) released it's decision on what defines a planet. In sum, the IAU now defines a planet as being a celestial body within a solar system that: 1. orbits the sun 2. is large enough to form into a round-ish shape 3. has "cleared the neighbourhood" of it's orbit Since Pluto did not meet the third criteria, it can no longer be considered a planet.


Is Mercury the smallest in the solar system?

Yes, as now the Pluto is excluded from the solar system, it is the smallest and the fastest planet in the solar system.


What was the the planet that is no longer a planet in your solar system?

Pluto, it is now a dwarf planet or planetoid.


What planet of the solar system is exception?

Pluto is often considered an exceptional planet as it was reclassified as a dwarf planet by the International Astronomical Union in 2006 due to its small size and different orbit compared to the eight classical planets.


Is Pluto a favorite planet?

Pluto is not a planet its a dwarf planet


Is Pluto a rocky or gas planet?

Pluto is a rocky world. Pluto is now reclassified as a dwarf planet.


Is Pluto has gone to black hole it is true or false?

False. Nothing actually happened to Pluto itself. All that has happened is that, after discovering several new Pluto-like objects, scentists came up with a new definition for a planet that excluded Pluto.