pluto is not a planet

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sqizee

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Pluto is not a planet because it is deleted from the solar system and now we have 8 planets
 
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enigma10

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It is deleted from being a full planet, not from the solar system. Major difference. <div class="Discussion_UserSignature"> <em>"<font color="#333399">An organism at war with itself is a doomed organism." - Carl Sagan</font></em> </div>
 
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newtonian

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sqizee - Actually, Pluto is what is was.<br /><br />What has changed is scientific consensus on English word usage.<br /><br />A study of linguistics does show that language usage changes over time for many reasons.<br /><br />Scientific definitions change with science, as old theories are proven wrong by new data.<br /><br />The good thing is that once truth is discovered, it is often accepted. <br /><br />Sadly, in some cases truths are ignored and old theories continue to be popular despite evidence to the contrary.<br /><br />Note my signature.<br /><br />Pluto has some characteristics of a planet, btw. However, it also has characteristics shared by other Kuiper belt objects, most smaller but some of similar size, and one - discussed on another thread - larger than Pluto!<br /><br />One might ask what would constitute a planet if discovered in the Oort cloud?
 
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MeteorWayne

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Newtonian....Who is AV again?<br /><br />In answer to your question, the current definition might not make a planet possible in the Oort cloud. First of all, proving a solar orbit would be exceedingly difficult, and probably require decades. Equally difficult would be prving it's hydrostatic equilibrium.<br /><br /><font color="yellow"> Current Definition:<br />RESOLUTION 5A<br />The IAU therefore resolves that "planets" and other bodies in our Solar System be defined into three distinct categories in the following way:<br /><br />(1) A "planet" (1) is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.<br /><br />(2) A "dwarf planet" is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape (2) , (c) has not cleared the neighbourhood around its orbit, and (d) is not a satellite.<br /><br />(3) All other objects (3) except satellites orbiting the Sun shall be referred to collectively as "Small Solar-System Bodies". <br /><br />--------------------------------------------------------------------------------<br /><br />1) The eight planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.<br />2) An IAU process will be established to assign borderline objects into either dwarf planet and other categories.<br />3) These currently include most of the Solar System asteroids, most Trans-Neptunian Objects (TNOs), comets, and other small bodies.<br />--------------------------------------------------------------------------------<br />IAU Resolution: Pluto<br /><br />RESOLUTION 6A<br />The IAU further resolves:<br /><br />Pluto is a "dwarf planet" by the above definition and is recognized as the prototype of a new category of trans-Neptunian obj</font> <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>
 
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kdog72

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Its' crazy. I don't know why they just didn't use Pluto as the minimum standard for a planet and go from there...seems like some of these edumacated people just like to throw around their IQ instead of just using common sense...
 
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MeteorWayne

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It's not crazy. In many ways it is more closely related to the dozens of Plutinos discovered so far than it is to the other 8 planets. <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>
 
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