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The International Astronomical Union changed the classification of Pluto in August of 2006. They downgraded it from a planet to a dwarf planet.
International Astronomical Union (IAU
Pluto used to be one of the nine planets, but it was re-classified as a Dwarf Planet on August 24th 2006 by the International Astronomical Union (IAU).
Because it is made up of only gass
The scientific 'community' made the decision. Pluto is considered to be too far away from the Sun to be classed as a planet of the solar system. It is now accepted to be part of the Kuiper belt.
International Astronomical Union was created in 1919.
To downgrade Pluto from planet to dwarf planet :)
It stands for International Astronomical Union.
The International Astronomical Union
IAU stands for International Astronomical Union
The International Astronomical Union changed the classification of Pluto in August of 2006. They downgraded it from a planet to a dwarf planet.
It was not one scientist that made this decision but the International Astronomical Union (IAU), which is the body officially recognized by astronomers and other scientists worldwide as the naming authority for astronomical bodies.
International Astronomical Union (IAU
According to the International Astronomical Union, Pluto is a dwarf planet.
Jacqueline Bergeron has written: 'Transactions of the International Astronomical Union, Volume XXIB (Transactions of the International Astronomical Union)' 'Reports on Astronomy' 'Highlights of Astronomy, Volume 9'
The International Astronomical Union (IAU).
88, as defined by the International Astronomical Union.