why pluto is not a planet anymore?

Question

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Answer 1

The term "planet" was given a new scientific definition. Pluto met all of the requirements of this definition except for one. It has not cleared the neighborhood around it's orbit. Essentially what this means is that it does not exert sufficient gravitaitonal superiority over the area around it's orbit. This is pretty much due to it's size. It is big enough by definition to be a planet, but it's small size prevents it from meeting that final criteria.

It is now classed as a dwarf planet, which has the same definition as a planet, except for that one point that pluto misses out on.

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

It's not a planet because of the following reasons and they are:-

Too small in size
Tilted orbit
Unlike the outer planet
Charon (it's sattelite) is too big for it. Almost half the size.

Answer 4

nope, not a planet D:

Answer 5

My very educated mother just served us nine ...