Pluto was regarded as a planet
until 2006, when astronomers
renamed it a "dwarf planet". The
reasoning behind the renaming
is the fact that Pluto behaves
differently from the other planets.
"After Pluto was discovered in 1930, astronomers continued to learn more about the planet, and they decided that Pluto was too small to qualify as a planet in our solar system.Even though it has its own moons and orbits around the sun, there are other objects as big as or bigger than Pluto nearby, so the International Astronomical Unit decided to change Pluto’s status."
---there are more than one other dwarf planets in the solar system: Eris and Ceres.
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