Read for your selfs~!! :-(

http://news.yahoo.com/s/ap/20060824/ap_on_sc/planet_mutiny_9

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PRAGUE, Czech Republic - Leading astronomers declared Thursday that Pluto is no longer a planet under historic new guidelines that downsize the solar system from nine planets to eight.

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After a tumultuous week of clashing over the essence of the cosmos, the International Astronomical Union stripped Pluto of the planetary status it has held since its discovery in 1930. The new definition of what is — and isn't — a planet fills a centuries-old black hole for scientists who have labored since Copernicus without one.

Although astronomers applauded after the vote, Jocelyn Bell Burnell — a specialist in neutron stars from Northern Ireland who oversaw the proceedings — urged those who might be "quite disappointed" to look on the bright side.

"It could be argued that we are creating an umbrella called 'planet' under which the dwarf planets exist," she said, drawing laughter by waving a stuffed Pluto of Walt Disney fame beneath a real umbrella.

The decision by the prestigious international group spells out the basic tests that celestial objects will have to meet before they can be considered for admission to the elite cosmic club.

For now, membership will be restricted to the eight "classical" planets in the solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

Much-maligned Pluto doesn't make the grade under the new rules for a planet: "a celestial body that is in orbit around the sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a ... nearly round shape, and has cleared the neighborhood around its orbit."

Pluto is automatically disqualified because its oblong orbit overlaps with Neptune's.

Instead, it will be reclassified in a new category of "dwarf planets," similar to what long have been termed "minor planets." The definition also lays out a third class of lesser objects that orbit the sun — "small solar system bodies," a term that will apply to numerous asteroids, comets and other natural satellites.

It was unclear how Pluto's demotion might affect the mission of        NASA's New Horizons spacecraft, which earlier this year began a 9 1/2-year journey to the oddball object to unearth more of its secrets.

The decision at a conference of 2,500 astronomers from 75 countries was a dramatic shift from just a week ago, when the group's leaders floated a proposal that would have reaffirmed Pluto's planetary status and made planets of its largest moon and two other objects.

That plan proved highly unpopular, splitting astronomers into factions and triggering days of sometimes combative debate that led to Pluto's undoing.

Now, two of the objects that at one point were cruising toward possible full-fledged planethood will join Pluto as dwarfs: the asteroid Ceres, which was a planet in the 1800s before it got demoted, and 2003 UB313, an icy object slightly larger than Pluto whose discoverer, Michael Brown of the California Institute of Technology in Pasadena has nicknamed Xena.

Charon, the largest of Pluto's three moons, is no longer under consideration for any special designation.

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it is not right to demote pluto according to me.

I had a similar reaction to you, and particularly since Pluto is pretty much my favourite planet (since I have it conjunct my natal sun - pretty intense, but rewarding!!!)  I then read a brilliant article on Lisa Dale Miller's website about what this means:

http://www.astrowisdom.com/plutodemoted.htm

If you're really in to astrology, particularly the symbolism of astrology, then you'll get some insights into Pluto's `demotion' from this article.  

                 

Thanks very much~!! I will read it...

It rules me I need to know... LOL t/y so much~!!  

It is still a PLANET whether large or small-the problem THEY are having is classifying everything, it is a HUMAN trait  to classify everything into categories, to pigeon-hole everything as it were. Just recently, astronomers started classifying every large or small body they found ( and are still finding) in the Kuiyper Belt, the problem arose because Pluto doesnt fit into THEIR categories anymore. It is still a PLANET. Astronomy is basically arguing over the terms BIG ,LITTLE and SHAPE.  I cant wait till New Horizons gets to Pluto and more data comes in, there has to be something more constructive than arguing over size!

Pluto is still very important. But I have to admit, with all the important stuff going on in the universe we cant just leave Pluto alone and move on- I wasnt aware that there was a quota on the number of "classical" planets. If you ever look at the planet depictions in Sumerian and Assyrian tablets theres more that 8 planets depicted there!