why is puto not a planet now?

Answer 1

maybe, what you are looking for may be found here:
http://en.wikipedia.org/wiki/Pluto

pluto does orbit the sun, is ball-shaped, does not have an isolated orbit (a bunch of other similar bodies have similar orbits.), and is not a satellite so it is not a planet. this does not change anything about the solar system or pluto. it just corrects the mistake of classifying pluto as a planet initially. i don't know how long this will drag on tho. many planetary astronomers are not satisfied that the definition is rigorous enuf. i can accept that the definition is flawed, but i can not accept that pluto is a planet.

many astronomers consider pluto and charon to be a binary system, but two small bodies orbit that system. they are called nix and hydra.

i have been waiting for this since i was about twelve. i feel somewhat satisfied. i knew that pluto didn't fit the pattern set by the major bodies in the solar system so it was an anomaly. it just felt "out of place". now that astronomers have found hundreds of other bodies with similar orbits, classifying "134340 pluto" as a planet is even more irrational. this was the right thing to do, believe me.

incidental, "134340 pluto" was never a moon of neptune. neptune did capture triton. this is why triton has a retrograde orbit.

Answer 2

Astronomers had a problem. A long time ago, Pluto was the only rock in that area of the solar system we knew about, so we considered it a planet. However, we've been finding a lot of rocks out there in that area, some of which are larger than Pluto. So, we have to go one of two ways:

1) All these other rocks, probably hundreds or thousands of them, will be considered planets. Pluto stays a planet, and elementary school children will have to memorize the names of each of the 615 planets. Bad.

2) None of these new rocks are planets. But some of them are so much like Pluto, that it's not reasonable to keep Pluto as a planet. So we cut down to eight planets, and Pluto gets cut down, but will also be the first discovered "rock really far out there!". So Pluto will always have a place in our hearts, just not as a full fledged planet [sigh].

And what about new planets? Well, they can't just be any ol' dog, they've got to be the biggest dog in town. The new definition states that planets have to "clear their area", in other words, be the biggest thing nearby. So we've got a good way to decide whether the next big rock we find meets the standard.

Answer 3

With new objects being discovered beyond Pluto, some of them larger than Pluto, astronomers needed an objective definition of the term "planet" to avoid having every snowcone out there declared a new Planet. There was never a real good reason to call Pluto a planet and not Ceres. So, a group of astronomers who had declared themselves the official astromonical term Pubahs came up with a definition, and Pluto didn't make the cut, since it has a funny orbit more like a comet's. Some of their reasons were a little vague.

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.
This is the reason why pluto has been renamed as a dwarf planet

Answer 5

1st of all it is not puto it is pluto if you don't mind. and pluto is not considered a planet anymore because 48%$ of scientists never believed that pluto was a planet because many a times pluto use to come in the orbit of neptune and it used become the 8th planet and now it was proved.
hence pluto is no more a planet and it is pluto not puto.
bye..............

Answer 6

Because Pluto orbits beyond the orbit of Neptune (usually). It is much smaller than any of the official planets and now classified as a "dwarf planet". Pluto is smaller than seven of the solar system's moons (the Moon, Io, Europa, Ganymede, Callisto, Titan and Triton).

Answer 7

Because it is too small ( there are other rocks out there orbiting the sun that are bigger). It is however considered a dwarf planet.

Answer 8

its because pluto is too small and is now considered as a dwarf planet....

Answer 9

because it does not behave like one. this is a serious answer.

Answer 10

u mean pluto rite????????/
search this site. u may get sum info