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PlutoOut of the "nine" planets that used to make up the Solar system, it was believed that Pluto was the farthest, though it periodically switched places with Neptune...

In 1992 astronomers found some small icy objects beyond Neptune, that were similar to Pluto in orbit,size and composition. And thus Pluto is considered the largest member of the Kuiper belt, a somewhat stable ring of objects located between 30 and 50 AU from the Sun.

(source -en.wikipedia.org/wiki/Pluto#Relationship_with_Neptune)

In 2006 the IAU decided to demote Pluto (coined the phrase 'pluto-ed' to lower in value) because it didnt meet the criteria of real planet.

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