Pluto: Planet or not?

OK, its crunch time for Pluto, with astromoners meeting to discuss whether to demote it from planethood: http://www.guardian.co.uk/space/arti...844050,00.html

But what does the backroom think? On the one hand, Patrick Moore says its not a planet, and frankly what Patrick Moore thinks about the solar system is next to gospel. On the other hand, an extra 50 or so planets would really mess with the astrologers, so that would be good. Also it would mean that some gilrs would be borne under the sign of Xena, which would be quite sexy.

My Boys Book of the Planets (copyright 1973) clearly says Pluto is a planet, and, although i may not quite have fulfilled my childhood ambition to be an astronaut, I say leave my space faring memories alone. For me Pluto is and will always be a planet.

Not. It isn't on the same plane as all the other planets....

GAH

It was always a runaway moon from neptune.

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Iwan Williams, president of the IAU's planetary systems sciences committee and astronomer at Queen Mary University, London, said: "Personally, I'd include them all as planets, but in normal conversation, we'd slightly qualify all our planets and say we have four terrestrial planets, four giant planets and however many dwarf planets."

A popular idea is to count only objects above a certain size.

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I agree with this guy, it would be better to remove our one definition band and introduce different grades of planets as he says ranging from dwarf to giant the advantage of this is easy classification is if we in the future come across something that is spherical and orbits a sun but doesnt match any of the classification we can create a new band for it.

so is pluto a planet? yes its a dwarf planet

Lots of people think that science is fixed and "correcct", becuase the science they were taught at school was exactly like this. Write in your science book that there are only eight planets in the solar system and your teacher will mark it wrong. This is an excellent chance for astronomers to remind us that science develops, and ideas change as the amount of evidence increases. We now know much more about Pluto, and what we know now suggests that it is much smaller than the other planets and more discoveries in the Solar System suggest that other objects are just as much planets as Pluto.

Be scientific. Demote it.

What would really be funny would be if they find something bigger then Mercury out there. That would really mess things up.

I think they need more steps on that asteroid/planet scale. Dwarf planet sounds good.

That makes a gah right?

Holst says it isn't.

Demote it!

Pluto is not a planet, it is a random celestial object raised to the status of planet only because the ancient astronomers of the 20th century lacked the means to see all the other pluto-like 'planets'.

We, children of the modern era, now know better. :book:

Calling Pluto still a planet is akin to thinking Bechuanaland or the Gold Coast are existing countries, or expecting an operator when dialling a phone number. It's so twentienth century...

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Originally Posted by Ironside

What would really be funny would be if they find something bigger then Mercury out there. That would really mess things up.

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After Pluto I think Mercury is the smallest planet, therefore everythingis bigger than Mercury...

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Originally Posted by Pannonian

Holst says it isn't.

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But he did write the Planets Suite before Pluto was discovered.

Not about Pluto, but very interesting:
http://news.bbc.co.uk/1/hi/sci/tech/5241774.stm

Very intriguing, Doctor. Thanks.

I'd be tempted to say yes, merely to annoy astrologers. No more easy money!

But in reality no. It's part of the Kuiper Belt objects.

Hmm, I smell some evil plot to throw over my worldview.:sweatdrop: :help:
Of course it's a planet, you all just like to jump on the smaller ones.:inquisitive:

it has a moon and an atmosphere,... I'd say yes. And if it doesn't qualifiy just make an exception. It has been called a planet so long...

Plenty of asteroids have moons. I say Pluto's out of the club! Kick it to the curb. Beside, I bet we're going to find even larger planetoids within five years ...

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it has a moon

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2 more where discovered last year.

I like the dwarf/medium/giant idea meself.

ANd totally off topic but.....


http://www.extrasolar.net/

Awesome site

its a planet. i saw pluto on it too.

Of course it is a planet

This is another case of politics deciding an outcome rather then science. There are a lot of objects similar to Pluto and a lot more in the future.

If Pluto is a planet why aren't all the members of the asteriod belt also planets?

Why aren't all the comets planets too?

I think a better definition of a major planet is an object that under its own gravity and rotation forms into a fairly uniform spheroid. Under this definiton the objects in the asteriod belt are not planets. Pluto can still be considered a planet within this definiton.

Now the difference between a planet and and a moon is that a planet would be one that orbits a star versus one that orbits another planet.

Also not there already are two classifications of planets Major (the nine) and the rest are minor.

About time Pluto got pwned...

Divide them into classifications with range.. the dwarf/giant classification idea would nice, especially since we're finding more and more variance in planets both within and outside the solar system now.

Its not the size of the boat its the motion of the ocean and this ocean is ice blye and cold

Isn't there something that is farther out which is larger than Pluto? Would that then be considered a planet? It even has a moon!

http://en.wikipedia.org/wiki/2003_UB313


If pluto is a planet, than so is UB313. And that means we have ten planets.

It is what it is.

What a serious matter to worry about.. As if Pluto isn't classified a planet, thousands, no million, no billions would die.. 0-i

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Originally Posted by Grey_Fox

After Pluto I think Mercury is the smallest planet, therefore everythingis bigger than Mercury...

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But Mercury cannot be demoted from its planet status and therefore everything larger than Mercury has to be a planet as long as it circles around the sun.

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Originally Posted by Papewaio

I think a better definition of a major planet is an object that under its own gravity and rotation forms into a fairly uniform spheroid. Under this definiton the objects in the asteriod belt are not planets. Pluto can still be considered a planet within this definiton.

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Wouldn't that make Ceres a planet? It's a fairly uniform spheroid, but is only about 950 km in diameter.
Gentlemen, forget what your courtesans have told you: size does matter! :laugh4:
CEO Nwabudike Morgan

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Originally Posted by x-dANGEr

What a serious matter to worry about.. As if Pluto isn't classified a planet, thousands, no million, no billions would die.. 0-i

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Well... most of the opposition of demoting Pluto comes from USA, who currently only found one planet, namely Pluto.
Considering the current US goverment, that pride loss... And NASA has been threatening with building military space stations if Pluto is demoted...

Spoiler Alert, click show to read: 

... Or the people getting most annoyed with this outside the scientiffic community will be the schools, as they'll need to update thier books. ~;)

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If Pluto is a planet why aren't all the members of the asteriod belt also planets?

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Its Asteroidism, that's why.

Lets hope they find an earth sized planet in the Kuipfer belt (sp?). Preferably with Cybermen living on it. That will shut all you planet naysayers up.

I'll invest my money in gold then.