why pluto is not considered as a planet?

Answer 1

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 2

The issue of "clearing the neighborhood" is most evident if you consider the asteroid belt (which is between Mars and Jupiter, nowhere near Pluto). Zillions of asteroids sail around in orbits that are close to each other and cross each other. All of them fail to clear the neighborhood. They are not planets. Earth, on the other hand, has no orbiting neighbors.

Answer 3

There are three main conditions for an object to be called a 'planet', according to the IAU resolution passed August 24, 2006.

1. The object must be in orbit around the Sun.
2. The object must be massive enough to be a sphere by its own gravitational force. More specifically, its own gravity should pull it into a shape of hydrostatic equilibrium.
3. It must have cleared the neighborhood around its orbit.

Answer 4

There are three main conditions for an object to be called a 'planet', according to the IAU resolution passed August 24, 2006.

1. The object must be in orbit around the Sun.
2. The object must be massive enough to be a sphere by its own gravitational force. More specifically, its own gravity should pull it into a shape of hydrostatic equilibrium.
3. It must have cleared the neighborhood around its orbit.

Pluto fails to meet the third condition. It is now conistered a dwarf planet.

Answer 5

because a.) its orbit overlaps the next to outermost planet. b.) the other outer planets are made of gas, whereas pluto is made of rock and ice. c.) its really close to an asteroid belt, and all those asteroids look like pluto. d.) the other outer planets have alot of moons, pluto doesnt. e.) the other outer planets are realy big, plutos not. f.) the other outer planets have rings, pluto doesnt. however, i still say **** it pluto is too a planet, screw all those technicalities.

Answer 6

who said so, i remember learning about it when i was in the 6th grade, it's is one of the planets, and it's number 9....rite??...
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Neptune, and Pluto..



hehhe, i still i remember them like the first time i learned them....