Pluto was considered a planet for more than 75 years, but in 2006 it was demoted to dwarf planet. …

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Pluto was considered a planet for more than 75 years, but in 2006 it was demoted to dwarf planet. …
The category of dwarf planets was created in 2006 by the International Astronomical Union to help contain new objects …
Pluto was considered the ninth planet in the solar system for more than 75 years, but in 2006 it …