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