Pluto
In the life of a planet they have to have three qualities
to be called a planet.
It must be round
A planet must orbit the sun
A planet must have cleared the neighbourhood of its orbit.
But Pluto only has two of these qualities
It must be round
And a planet must orbit the sun
So because of that Pluto is not a real planet so it gets called a dwarf planet for not having all the qualities and because of its size.
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