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The much-debated 2006 reclassification of Pluto as a dwarf planet happened because of the newly agreed-upon threefold definition of a planet: it has to be in solar orbit, has to be spherical (or in hydrostatic equilibrium) and has to have cleared its orbit - and it failed on the third count, since Pluto was considered to have only cleared less than a tenth such mass.

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Related Questions

What planet has the most planets?

Planets don't have planets. The Sun has planets, and planets have moons.Dwarf planets might orbit around each other, but this answer uses the correct definition of the term planet, which does not include Pluto or Charon.


Is Pluto still one of the planets of our solar system?

Pluto has not changed in any way. Our definition of a planet has changed. So, Pluto is no longer a planet, it is a minor planet of our solar system.


How does Pluto interact with planets?

Pluto does not interact with any planets.


What does Pluto not have that planets do?

Pluto does not have an orbit clear of asteroids and debris. Planets do.


What does Pluto have that planets don't?

Pluto has asteroids in its orbital path. Planets don't.


Why have astronomers decide that Pluto should be reclassified as a dwarf planet?

They agreed a new definition of a planets and created "dwarf planets" as a separate type of object. Pluto qualified only as a "dwarf planet", because it is not the dominant object in the neighbourhood of its orbit.


Are planets tiny planets?

pluto


What are Pluto's neigboring planets?

Pluto's only neighbouring planet is Neptune, though there are other dwarf planets beyond Pluto


What planets turned to dwarf planets?

Pluto


Was Pluto a moon to any planets?

Yes, Pluto was a moon to one of the planets called Neptune.


What is number of planets in our solar system?

There are 8 planets not including Pluto and 9 including Pluto.


How far is Pluto from the other planets as it orbits the sun?

How far away is Pluto from all the pther planets?