plz answer me ??????

Question

i think that pluto isn't from te outer planets and i refuse to say that it isn't a planet why they say that ????
why they didn't think that it used to be with a diff. groups { not inner or outer planets } they discover 2 plants new why pluto isn't with them in special group ???????????
and if u knew any think about this answer me ;)

Answer 1

What with all the misspellings, bad grammar, etc., your question was hard to decipher. But, I think I finally have it. You are asking why Pluto was declared to be NOT a planet.

"Members of the International Astronomical Union, meeting in Prague, approved on Thursday a measure that limits the definition of "planet" in a way that excludes Pluto. From now on, only (1) a spherical object that is (2) circling the sun and that has (3) "cleared the neighborhood around its orbit" by sweeping up all stray objects with its gravitational pull can properly be called a planet. Tiny Pluto does not meet the last criterion"

The International Astronomical Union is the "end all and be all" for astronomers. This is the group that gets to say what is or is not a planet.

Answer 2

Is Pluto a planet???? Yes and no...

Well for starters, Pluto is just too small. In the neighborhood where Pluto lives? Planets are supposed to be huge. The Jovian planets, Jupiter, Saturn, Uranus and Neptune are 20 to 300 times the size of the Earth, and Pluto is really small compared to the Earth, smaller than our Moon. Kind of stands out.

And Pluto is not made out the same material as the Jovians. The large planets are mostly gigantic spheres of gas, mostly hydrogen and helium. Likely there are no solid surfaces, only denser and denser gas all the way in. Pluto is a small solid world of methane, water, carbon dioxide and ammonia ices, maybe a little rock and with a just hint of atmosphere (that freezes out and falls as snow in her "winter").

And third, Pluto's orbit is the most eccentric (oval shaped) and the most tilted to the plane that the rest of the planets orbit in. Also, Pluto is locked in a resonance with Neptune's orbit and comes closer to the sun than Neptune sometimes.

There were theories that Pluto was a lost moon of Neptune but that was before we discovered she a has one large moon (Charon) half her size (pretty much, this system is a double planet) and recently two other teeny-tiney moons (Nix and Hydra).

Pluto seems like she cant be an ejected moon-she must have formed on her own and seems to be part of an entire army of small icey-dwarf objects that circle just outside Neptune's orbit in what is known as the Kuiper belt. We have no idea of how many or how large these objects may be, hundreds???? NOT "planets" proper, hence the new term "dwarf planet" where Pluto is king.

But... I still think Pluto SHOULD be called a planet because of historical reasons (discovered by an American, financed by Percival Lowell, Tombaugh's life story, etc).

Answer 3

In 1930 when Pluto was discovered they didn't really know how big it was. They guessed it was larger than Mars but were not sure. They also did not know about any other objects that far from the Sun. But there was unease with calling it a planet even back in 1930 because its orbit crosses the orbit of Neptune, something no other planet does.

Now they have definitely measured Pluto's size and it is smaller than the Moon. They have also discovered other small objects orbiting way out there, one of which is slightly larger than Pluto. There is a good chance that there are many such tiny bodies out there waiting to be discovered. Nobody wanted to have hundreds of planets, 8 of which were large and in nice orbits, and hundreds of small, oddly orbiting distant planets, so they made up a new category called "dwarf planet". Pluto is in this new category, as is the newly discovered distant object now called Eris. They also reclassified Ceres, the largest asteroid in the main belt between Mars and Jupiter, as a dwarf planet. It makes perfect sense.

Answer 4

The new 'planets' and Pluto have all been classified as Kuiper Belt objects - large snowballs or ice/rock mixes that orbit the sun in irregular orbits outside the orbit of Neptune.