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This blog is all about science and technology (with occasional math thrown in for fun). The goal of this blog is to try and pass on the sense of excitement and wonder I feel when I read about these topics. I hope you enjoy the posts.

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Why is Pluto Not a Planet?

Posted February 24, 2015 3:43 PM by Bayes

In the excellent video below, an explanation is provided as to why Pluto is not considered a planet anymore. It is quite a reasonable and articulate argument.

https://vimeo.com/85738666

I personally feel Pluto should have held on to its planet classification out of tradition, but the deed is done and there is no going back now. As NASA's New Horizons approaches the "dwarf planet" Pluto, and we get clearer and clearer images and data from the probe, I can't help but feel like a circle is being closed in my life.

When I was a young child, I used to read and reread an old picture book of the Solar System we had in our house. I was obsessed with the book and memorized its every detail. I learned about the Viking and Voyager Missions. I knew the order of the planets, their respective sizes, how Uranus spun on its side, how Venus was hotter than Mercury even though Mercury was closer to the Sun, etc. If anyone was careless enough to bring up the planets around the ten year old version of me, they were subjected to all these facts and more. It was my first real passion and it was my gateway drug for science.

To me, Pluto will always be a Planet. I can't help it. I can't betray that 10 year old that spent all that time memorizing the planets and their stats, dreaming about them drifting along in cold, empty space. Wondering when we would finally visit the rest of them, especially distant, lonely Pluto at the edge of everything. At the time there wasn't much information on Pluto and the book was filled with estimates and question marks where its stats should be. I stared at those question marks, trying to guess what they were. I was obsessed. I wanted to know. No, I needed to know!

As you would expect, I'm much more excited about New Horizons than I probably should be. After all, it's just a flyby of a Kuiper Belt object. A small, icy dwarf planet in a region filled with dwarf planets. Sure we'll have a better idea of what Pluto looks like and about its composition, but there isn't likely to be any huge discoveries. More like a filling in of the blanks. Still, for me it's important. if only because in July I will finally, after 30 years get to see the last of those question marks on Pluto's page filled in.

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#1

Re: Why is Pluto Not a Planet?

02/24/2015 4:58 PM

"-but the deed is done and there is no going back now."

Actually, I think Harvard is leading the charge to reinstate Pluto's status as a planet as of late last year.

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#2
In reply to #1

Re: Why is Pluto Not a Planet?

02/24/2015 9:06 PM

Probably not much point to it. There is now about 10 years worth of kids who have been taught there are eight planets. Since the logic for relabeling Pluto was relatively sound, it's hard to justify changing it back. The future belongs to the young. Although I don't still don't approve the original act.

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#4
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Re: Why is Pluto Not a Planet?

02/24/2015 11:02 PM

"Science advances one funeral at a time." -- Max Planck

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#6
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Re: Why is Pluto Not a Planet?

02/25/2015 4:03 AM

What's 10 years, there were like over 50 years worth of kids that were taught that there were 9 planets.

Anyways.... The way it is now, since nobody wants to hurt others feels, (I.e. To be politically correct :/) they'll have subclass of planets, which I beleive because of this, they already do have.

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#8
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Re: Why is Pluto Not a Planet?

02/25/2015 7:49 AM

I think they should grandfather it in. ;-)

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#12
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Re: Why is Pluto Not a Planet?

02/25/2015 4:02 PM

If Pluto is re-instated, then all the other planetoids should be included as well, at least as long as they (1) orbit the sun, (2) have a shape that is more or less defined as something other than a potato, and (3) more or less have cleared out space dust around them or their orbit. I personally would like to witness Pluto scourging the Kuyper belt and gobbling up some of the bigger asteroids there. Not first-hand mind you, I only watch this stuff on TV.

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#3

Re: Why is Pluto Not a Planet?

02/24/2015 11:01 PM

Gotta love "science" done by committe voting rather than by science.

  • Pluto orbits the sun, albeit elliptically, in a canted orbit.
  • Pluto is spheroid...at least its not doughnut shaped.
  • Pluto has a moon (or two).
  • Pluto likes to "waltz" with its moons...our Sun waltz's with the planets.
  • Pluto isn't locked into the Ort Cloud.

I my mind that makes Pluto a planet...STILL.

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#5

Re: Why is Pluto Not a Planet?

02/24/2015 11:06 PM

As a pre-teen, I too had the obsession.

I remember I also wanted to get a perspective of the solar system so I started with a piece of 8.5 by 11 paper and put a 'sun' an inch or two away from the edge. Then I used a compass to draw circular orbits around the sun for Mercury, Venus, then I had to go to string to get the other orbits. I don't remember exactly how many sheets of paper I had to tape together (landscape mode) but eventually I got Pluto in there too. It must have a been a string of sheets of paper about 10 feet long. Had it on the wall in my room for a long time.

A home-made 6 inch reflector on a cobbled together equatorial mount made from some pillow block bearings from an old paper machine my dad brought home from one the plants he worked on and various iron plumbing fittings and steel TV mast tubing. The f-10 mirror was courtesy of one of my dad's co-workers that hand ground and aluminized the mirror but then ran out of motivation to make the rest. My dad gave me a fair amount of help with 'dangerous' shop tools but he had me 'do' most of the design and scrounge materials and do all the assembly and finish work. Bought the tube and eyepiece mount from Edmund Scientific with my allowance and lawn mowing money as well as a paper board star finder, books, etc.

I couldn't possible thank my father enough for all the skills, sense of wonderment in the 'mundane', inquisitiveness, and simple determination that if someone else can do it, with a little learning, there's no reason why I can't do it either.

Later on in life, he refers to it as "The Curse". My list of DIY home projects in progress is testament to that.

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#7
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Re: Why is Pluto Not a Planet?

02/25/2015 7:14 AM

Great story, thanks for sharing it. I bet every one on CR4 has a story like ours. Maybe it wasn't when they were young and maybe it wasn't anything to do with space, but I'm sure there was a moment for them that made them realize they had a passion for engineering/science.

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#13
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Re: Why is Pluto Not a Planet?

02/25/2015 5:33 PM

"I bet every one on CR4 has a story like ours." This is what makes CR4 so enjoyable, at least to me. A blog with that title would be great.

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#9

Re: Why is Pluto Not a Planet?

02/25/2015 8:19 AM

What we classify it as makes no difference what so ever to the object.

Del

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#10
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Re: Why is Pluto Not a Planet?

02/25/2015 9:20 AM

But it makes a difference to us, and personally, I care more for the difference it makes in human thought and reasoning than I do for the difference it makes for the Mi-Go.

References (for those who don't know their Lovecraft):

http://en.wikipedia.org/wiki/Pluto_in_fiction

http://en.wikipedia.org/wiki/Yuggoth

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#11
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Re: Why is Pluto Not a Planet?

02/25/2015 1:15 PM

It could make a difference..... If value is found on Pluto, and if technology is advance enough to retrieve this value. Classification may mean a lot to who can claim it.... Was I thinking out loud again....

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#14
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Re: Why is Pluto Not a Planet?

02/26/2015 10:08 AM

Yes but you would not call the bean counters and lawyers as that, but something more like Ort litigators, or Ort counters, not in that order.

Suppose at least some of the major bodies in the Ort Cloud came from interstellar space... and that somehow they contained a higher precentage of something useful, like Lithium or Tritium, or even Helium 3. These might be worth more (at least the last two) than their mass in gold). For that matter, we don't know how easy it would be (if extended power was available such as nuclear fusion) to actually go there, and have robots mine the core of the frozen worldlet for all manner of precious metals to be found there.

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#15
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Re: Why is Pluto Not a Planet?

02/26/2015 11:32 AM

Party pooper

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#16
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Re: Why is Pluto Not a Planet?

02/26/2015 11:56 AM

Not pooping on the party right now, I was almost serious! Not that we have to go that far to mine something useful on dead rock planets. Oops - planetlets.

I am listening - so please do go ahead and think aloud.

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#17
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Re: Why is Pluto Not a Planet?

02/26/2015 12:21 PM

I just put thinks out there, technology isn't there yet. As far as mining such as efficiently things like minerals and what kind of minerals that make it worth it... Well, "you don't know, what you don't know".

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#18

Re: Why is Pluto Not a Planet?

03/02/2015 12:20 PM

Here's a minor planet that's apparently inhabited. (They left the light on.)

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