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A planet has to have its own orbit.... pluto does not.
A planet has to have a moon that orbits the planet. pluto has charon, they orbit each other.
A planet's moon is supposed to be significantly smaller in size. pluto and charon are very close in size.
this is all i can think of for now. there are more reasons.
WRONG!
maybe thats the case for a planet for you but not for the rest of the astronomical community!
plute DOES have its own orbit (although it does intersect neptune's)
it DOES NOT have to have a moon (name one moon of mercury!)
define significantly for me! the damn thing is so far away we can only really guess as to its size. we only know of charon cuz of the effect on pluto's orbit.
this is a planet according to dictionary.com:
plan·et (plnt) Pronunciation Key Audio pronunciation of "planet" [P]
n.
1. A nonluminous celestial body larger than an asteroid or comet, illuminated by light from a star, such as the sun, around which it revolves. In the solar system there are nine known planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
well, pluto is "non-luminous" and it IS bigger than an asteroid and a comet.
we'll all just have to wait for that probe to get close enuf to it in 5 years or so to determine how close to a comet it really is...
2000 3.8L Camaro A4 Pewter Y87<br />K&N Filter, SLP Ram Air kit, Eibach Pro Kit, Flowmaster 80 series, Silverstars, NGK plugs and MSD Super Conductor Wires, Electric Water Pump
Quote:
Originally Posted by stevethepirate
pluto isnt a ****ing planet.
A planet has to have its own orbit.... pluto does not.
A planet has to have a moon that orbits the planet. pluto has charon, they orbit each other.
A planet's moon is supposed to be significantly smaller in size. pluto and charon are very close in size.
this is all i can think of for now. there are more reasons.
Those aren't part of the definition of a planet. The reason why Pluto is no longer a planet is because its orbit intersects with Neptune's."
could that almost be considerd another moon of neptune just a question because it is smaller and it orbits neptune dose it not????
plan·et (plnt) Pronunciation Key Audio pronunciation of "planet" [P]
n.
1. A nonluminous celestial body larger than an asteroid or comet, illuminated by light from a star, such as the sun, around which it revolves. In the solar system there are nine known planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
well, pluto is "non-luminous" and it IS bigger than an asteroid and a comet.
The problem is that they are discovering a lot of other things that also meet that definition. They are known as Kuiper Belt Objects. They're kinda like asteroids, but out past Neptune. Pluto is a KBO, the first to be discovered and the brightest as seen from Earth. But, in 2005, they discovered a KBO bigger than Pluto. There are a few others known to be "larger than an asteroid". And more KBOs are being discovered all the time.
We were heading for having several new planets. Astronomers almost decided to go that way. But they ultimately decided that wasn't right. Here's the best short explanation I've seen:
"People all over, from school kids to astronomers, will feel like part of their landscape has been ripped away from them, but that is no reason to not accept the scientific reasonableness of this proposal. I suspect that any sentient being arriving into the solar system for the first time would very quickly classify the four giant planets in one group, the four terrestrial planets in another group, the asteroids in a third group, and Kuiper belt objects in a fourth group, and have a few leftovers. It seems impossible to fathom that the biggest one or two or even 43 objects from the Kuiper belt group would be somehow removed and placed into any of the other groups. They would quickly come to the conclusion that there are 8 major bodies orbiting the sun."
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