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The IAU decides on what is a planet under new guidelines

The International Astronomical Union decided that upon further discovery of smaller body's of planet like material in our solar system but far from the sun or Neptune's orbit of the sun that all new planets found would probably be small and are to be named as dwarf planets.

This was prompted recently by the discovery of the then named Xena now Eris our 5th dwarf planet

Eris is larger and rounder in shape than Pluto which prompted the Question When is a Planet not a planet? in 2006 they issued new guidelines where Pluto lost it's planetary status and was demoted to a dwarf planet.

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14y ago
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13y ago

Well the definition of a planet would be any celestial body (other than comets or satellites) that revolves around a star according to wordnetweb.com

So just base it to that.

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13y ago

The definition of a planet:

It orbits around the sun.

It has to have a great mass to make hydrostatic equilibrium. (a round shape)

it cleared the neighborhood.

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8y ago

The definition of a planet was set by the International Astronomical Union.

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Q: Who decides if a planet is a planet?
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Why planet Pluto was not anymore a member of the solar system?

The IAU decides what is a planet and what is not. Pluto is an icy body which has not cleared a substantial fraction of material from its orbit, and it is smaller than other bodies residing in the Kuiper Belt. It is also more of a coplanet with Charon, its largest moon. For these reasons Pluto is considered a dwarf planet.


What decides if a dwarf planet is a dwarf planet?

It needs hydrostatic equilibrium (roughly spherical shape cause of gravity) and hasn't cleared it's orbit of planetoids (other asteroids and dwarf planets). The definition of dwarf planet is contested because a number of major planets haven't cleared their orbits of planetoids. It's likely we will be looking for a better definition in the future as we have in the past as well.


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The Chaser Decides ended on 2010-08-25.


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Is Pulto a planet or a dwarf planet?

A dwarf planet it used to a be a planet

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What decides if a dwarf planet is a dwarf planet?

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