Why Has Pluto Become A Planetoid?

Question

Pluto has been one of the 9 planets for a very long time. Why is it a Planetoid now?

Answer 1

A planet has some physical properties that are different from other moving objects in the space. Pluto has only one property of those three propertires/characterstics of the planets. the three characterstics of planets are:
1.) it should rotate on a fixed axis, in a fixed time period and in a relevent manner.
2.) it should clear its surroundings, i.e. it should not have other space objects arround it.
3.) A planet should have a hard, rigid surface.

Pluto has one one property i.e. it has a fixed axis and orbit but has not cleared its surroundings, it has many other small objects surrounding in its neighbour. Pluto also does not have a rigid body, it has a smooth cloudy surface.
so by study it has shown that it has only one characterstic of three so it should be called half planet or a Planetoid.

Answer 2

Pluto Planetoid

Answer 3

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RE:
Why Has Pluto Become A Planetoid?
Pluto has been one of the 9 planets for a very long time. Why is it a Planetoid now?

Answer 4

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Because persons living today love the status quo and any change causes them to be emotionally upset and frightened of the world around them. When pluto was originally discovered, THIS is when the world was filled with political dogma. England and France were in a mad rush to find this planet x which was supposedly affecting Neptune's orbit. The first country to make the discovery would go into the history books. When Clyde Tombaugh discovered Pluto in 1930, he knew it was too small to be planet x. Yet political pressures dominated the discovery and it was rushed into print that the English found planet x before the French astronomers. Because of the ice content of Pluto, it was once thought to have 4 times the mass of Earth. In fact, Pluto is the second shiniest orb in our Solar System other than Iapetus. The flyby of Voyager 2 in 1986 provided conclusive data that not only was Pluto not planet x but there exists no planet x as Neptune's orbit does not have any mathematical anomolies. Consequent studies have proven that Pluto is smaller than 7 of the moons of our Solar System but its size does not disqualify it as a planet. Pluto is not a planet because it has not cleared its orbital path. It is simply a member of the Kuiper belt objects. Oklatona is incorrect. Her answer is based upon ill-formulated emotion and not upon any scientific facts. First, she falsely claims that Pluto has not been struck by another orb so this means it is a planet. This statement of hers is totally incorrect. Pluto rotates with its equator at a 90 degree angle to its orbit around the Sun. This in not normal and is highly indicative that it was struck by an orb in a collision so severe that it tipped Pluto on its side (much like the planet Uranus). Second, Pluto has a retrograde rotation (like the planet Venus) which is also strongly indicative of a collision which severely affected Pluto's rotation. Third, the current theory is that Pluto's companion Charon was more likely than not formed when a dwarf planetoid crashed into Pluto (much in the same way that our Moon was formed by the Giant Impact). Fourth, oklatona bases her false conjectures upon her own opinion. Not upon any old or new existing scientific data. Oklatona's remarks were spewed out from a biased emotional opinion. Not facts. As far as her remarks stating that Pluto has never been struck by another object, the obvious observation is Pluto's highly elliptical orbit not shared by any other planets. Only a collision with another object would produce such an elliptical path. Finally, upon what possible data does she base her remarks when there has never been a close flyby past Pluto. The very first ever flyby is planned for 2015 by New Horizons so Oklatona must be a mystic that can see into the future.

Answer 5

Pluto, the last planet to join the heavenly pantheon, became the first to leave it. The status of Pluto had been under discussion for some time, but with the discovery of 2003 UB313, nicknamed Xena, the question became acute, for it seemingly had as much right as Pluto to be called a planet.

On August 24, 2006, the International Astronomical Union surprised the world by voting in a new definition of planet, one that would exclude Pluto and bring the total number down to eight. (There had previously been been strong speculation that the redefinition would bring the total up to 12 instead of down.)

Pluto was instead classified as a dwarf planet, along with Ceres and the aforementioned Xena. The main difference between a dwarf planet and the real thing is that the dwarf variety has not cleared the area of its orbital path.

This redefinition met with a wave of protests from those who wanted to see the ninth planet grandfathered in, including but not limited to supporters of the late Clyde Tombaugh, who discovered Pluto in 1930. His widow, however, said he would have been accepting of the IAU's decision since "he was a scientist" and understood that astronomers had to take into account newly discovered objects in the Kuiper Belt (where Pluto is located).

But opponents of Pluto's demotion remain unconsoled and have generated a thriving industry in T-shirts, mugs and other memorabilia. Among the many slogans of this movement was one which played on the mnemonic for the names of the erstwhile nine:

Answer 6

Because the definition of "planet" is arbitrary. Pluto had been considered a planet since about a century ago - amd has so far entered the realm of common knowledge - why take it away just due to size matters? He's bright enough, and thus visible enough from the Earth to be known way before other asteroids of the same size. But, alas, Pluto is no more, like an animal we loved, now lost from sight in a flock of asteroids.

Answer 7

Pluto isn't a planetoid (whatever that is!) it's a dwarf planet.

Answer 8

According to Ayaz Ali, the third criterion for planetary status is "a hard, rigid surface". I'm confused by this answer. Jupiter, Saturn, Uranus and Neptune are clearly still classified as planets but are gas giants. As I understand, these four planets have no hard surfaces whatsoever but are large bodies of gas held together by their own gravitation.

Answer 9

it's not a planetoid, that I know of

Answer 10

People need to stop hating on Pluto.