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The short answer is that the decision was ultimately made by the International Astronomical Union, or IAU.
The longer answer is that nobody actually ever decided Pluto wasn't a planet. You see, before August 24th, 2006, there was no official definition of what is and is not a planet. As more differences were noted between Pluto and the other eight planets in our solar system, the need for an official definition became more pressing. Eventually the IAU met and formulated a definition upon which they could all agree. This definition excluded "planets" with characteristics like Pluto has, thus changing its classification from planet to dwarf planet.
Wiki User
∙ 13y ago
Wiki User
∙ 9y agoIn 2006 the International Astronomical Union decided Pluto wasn't a planet after all. The object was named a "dwarf planet" because it doesn't clear the path of all the surrounding objects in its orbit but is also not a satellite of another object.
Wiki User
∙ 14y ago"The enigmatic, icy world spotted in 1930 has been given the official moniker of 134340 Pluto. It has been lumped among 136,562 asteroids and other small bodies by the Minor Planet Centre (MPC), which is part of the Paris-headquartered International Astronomical Union (IAU)."
This is a link to the good explanation I got that from.
http://www.abc.net.au/news/newsitems/200609/s1740456.htm
Wiki User
∙ 13y agoIn 2006, the International Astronomical Unit (IAU) put up criteria, a definition, for the term 'planet.' Pluto is now considered a dwarf planet because it does not meet all the criteria coined by the IAU.
- is in orbit around the Sun,
- has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and
- has "cleared the neighbourhood" around its orbit.
Wiki User
∙ 6y agoThe International Astronomical Union (IAU) in Prague, Czech Republic, in August 2006 stated that, in the Solar System, a planet is a celestial body which:
- is in orbit around the Sun,
- has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and
- has "cleared the neighborhood" around its orbit.
Wiki User
∙ 14y agoAbout 2 years ago... They said it was just a star
Wiki User
∙ 14y agoEarly last year, or the late year before that.
Wiki User
∙ 12y agoThe International Astronomical Union declared in 2006 that Pluto should be reclassified as a dwarf planet.
Wiki User
∙ 11y agoIn the year 2006.
Wiki User
∙ 15y agoAugust 8 2006
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What was the the planet that is no longer a planet in your solar system?
Pluto, it is now a dwarf planet or planetoid.
The closest planet to pluto?
neptuneNeptune is the closest to Pluto. Uranus is the second closest planet to Pluto. Saturn is the third closest planet to Pluto. Jupiter is the forth closest planet to Pluto. Mars is the fifth closest planet to Pluto. Earth is the sixth closest planet to Pluto. Venus is the seventh closest planet to Pluto. Mercury is the most furthest away from Pluto. The Sun and the moon are not considered as planets. The planet Pluto is also not considered as a planet.
How is Pluto different from planet X?
"Planet X" was originally a term for a hypothetical TENTH planet, BEYOND Pluto. Also, Pluto is no longer considered a planet.
Which planet is smaller than Pluto?
Pluto is no longer considered a planet, it is now classified as a "Dwarf Planet". As a planet or a dwarf planet, Pluto was the smallest in our solar system. Mercury is now the smallest recognised planet. Pluto's equatorial diameter is 2,274 km. Mercury's equatorial diameter is 4,880 km.
Which planet has 3 moons?
Charon, Nix and Hydra are the 3 moons of Pluto. Pluto is no longer considered to be a planet, but is classified as a dwarf planet.
When it was agreed that Pluto is not a planet?
August 24, 2006 is the date when Pluto was consider no more a planet.
Around what date was Pluto no longer considered a planet?
2007
What date was the first motherboard invented?
It was made by Chris brown on the planet pluto, but we all know that is wrong, because pluto is now not identified as a planet. IDIOTS
What was the the planet that is no longer a planet in your solar system?
Pluto, it is now a dwarf planet or planetoid.
Is Pluto a favorite planet?
Pluto is not a planet its a dwarf planet
The closest planet to pluto?
neptuneNeptune is the closest to Pluto. Uranus is the second closest planet to Pluto. Saturn is the third closest planet to Pluto. Jupiter is the forth closest planet to Pluto. Mars is the fifth closest planet to Pluto. Earth is the sixth closest planet to Pluto. Venus is the seventh closest planet to Pluto. Mercury is the most furthest away from Pluto. The Sun and the moon are not considered as planets. The planet Pluto is also not considered as a planet.
Is Pluto a rocky or gas planet?
Pluto is a rocky world. Pluto is now reclassified as a dwarf planet.
What date was Pluto reclassified as a dwarf planet?
The reclassification was done on August 24, 2006.
What tipe of planet is Pluto?
Pluto is a dwarf planet
What planet change to Pluto?
dwarf planet Pluto
Why did sientists agree that Pluto was not a planet?
Pluto is a planet!
Did you know Pluto is planet from the Sun?
Pluto is not a planet
