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Q: How does the IAU classify objects in our solar system?
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What is the smallest outer planet in our Solar System?

According to those who do not accept the IAU's judgement on such matters - and no one is required to - Pluto. While Pluto was declared by the IAU to no longer be a planet, many disagreed. They had - and have - that right.


What is the name of the object in your solar system that is now called a dwarf planet?

It is planet Pluto. ______________________ There are five "dwarf planets" in our solar system, as of August 2010. There are certainly dozens or hundreds more in the distant parts of our solar systems, but our telescopes are not yet good enough to see them. Pluto was considered a planet until the International Astronomical Union (IAU) reclassified it. Ceres was an asteroid before the IAU reclassified it. The Kuiper Belt Objects later named Eris, Haumea and Makemake were all considered to be candidates for being named the "Tenth Planet" until the IAU came out with its definition of "planet". In fact, it was the discovery of the dwarf planet Eris, originally called "Xena", that caused the IAU to finally come up with a formal definition of "planet". All three of these objects are now considered to be "dwarf planets". There are several other large asteroids that probably deserve "dwarf planet" status as well; Vesta, certainly, and Pallas, and perhaps a few others.


What other dwarf planet exist in the Solar system?

The Caltech astronomer Mike Brown identifies nine Solar objects that he calls dwarf planets. the first five on the list below are the only recognized by the International Astronomical Union (IAU):ErisMakemakeHaumeanPlutoCeresSednaQuaoarOrcus2007 OR10Brown, estimates that there are many more, and listed 390 candidates in a 2011 publication.


In your solar system you have one sun nine?

In our solar system there is one Sun and eight planets. Formerly Pluto held a slot as the ninth planet - but in 2006 the IAU decided to reclassify it as something other than a true planet, thus reducing the count to eight.


What changed about Pluto in 2006?

In 2006, pluto's classification was changed to "dwarf planet". This removed it as one of the nine planets in our solar system. It was done so by the IAU (international astronomical union). The main reason for this is due to the orbital path of Pluto as it crosses Neptune's and thus does not fit the IAU's definition of a "planet".

Related questions

What are rocky objects found in the inner solar system?

Planets.Or, if they are smaller and have not met the [http://en.wikipedia.org/wiki/Definition_of_planet IAU definition of a planet], they are called Asteroids.


How many planets are there in solar system recognized by IAU?

9 planets are there


What is the smallest planet in our solar system.?

According to those who do not accept the IAU's judgement on such matters - and no one is required to - Pluto. While Pluto was declared by the IAU to no longer be a planet, many disagreed. They had - and have - that right.


What is the Smallest planet in the solar system.?

According to those who do not accept the IAU's judgement on such matters - and no one is required to - Pluto. While Pluto was declared by the IAU to no longer be a planet, many disagreed. They had - and have - that right.


What is the smallest outer planet in our Solar System?

According to those who do not accept the IAU's judgement on such matters - and no one is required to - Pluto. While Pluto was declared by the IAU to no longer be a planet, many disagreed. They had - and have - that right.


Order of the solar system?

The International Astronomical Union (IAU) recognises eight planets in our solar system (from closest to sun to furthest); Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.


The six planets of the solar system?

The International Astronomical Union (IAU) recognises eight planets in our solar system (from closest to sun to furthest); Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.


Number of the planets in the solar system?

The International Astronomical Union (IAU) recognises eight planets in our solar system (from closest to sun to furthest); Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.


What are three planets in your solar system?

The International Astronomical Union (IAU) recognises eight planets in our solar system (from closest to sun to furthest); Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.


What is the name of the object in your solar system that is now called a dwarf planet?

It is planet Pluto. ______________________ There are five "dwarf planets" in our solar system, as of August 2010. There are certainly dozens or hundreds more in the distant parts of our solar systems, but our telescopes are not yet good enough to see them. Pluto was considered a planet until the International Astronomical Union (IAU) reclassified it. Ceres was an asteroid before the IAU reclassified it. The Kuiper Belt Objects later named Eris, Haumea and Makemake were all considered to be candidates for being named the "Tenth Planet" until the IAU came out with its definition of "planet". In fact, it was the discovery of the dwarf planet Eris, originally called "Xena", that caused the IAU to finally come up with a formal definition of "planet". All three of these objects are now considered to be "dwarf planets". There are several other large asteroids that probably deserve "dwarf planet" status as well; Vesta, certainly, and Pallas, and perhaps a few others.


Why do they call them dwarf planets?

The new designation 'dwarf planet' for Solar System objects was decided in 2006 by the International Astronomical Union (IAU), which has jurisdiction over the classification and naming of astronomical bodies. Because more Pluto-sized objects were being located in its area of the solar system (the Kuiper Belt), the IAU decided to limit "planet" status only to the eight large bodies that dominate their respective orbital areas, as far out as Neptune. So the potential for a constantly-changing and contentious count of 'planets' would be avoided (reminiscent of the "moons of Jupiter", which were classically 12 but now number 63).


What other dwarf planet exist in the Solar system?

The Caltech astronomer Mike Brown identifies nine Solar objects that he calls dwarf planets. the first five on the list below are the only recognized by the International Astronomical Union (IAU):ErisMakemakeHaumeanPlutoCeresSednaQuaoarOrcus2007 OR10Brown, estimates that there are many more, and listed 390 candidates in a 2011 publication.