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The explanation says: "... Pluto has been the ninth planet in our solar system until 2006 ...".
 
The explanation says: "... Pluto has been the ninth planet in our solar system until 2006 ...".
  
It should say 'the tenth' shouldn't it?
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It should says 'the tenth' isn'it?
 
[[User:SioD|SioD]] ([[User talk:SioD|talk]]) 14:52, 30 August 2013 (UTC)
 
[[User:SioD|SioD]] ([[User talk:SioD|talk]]) 14:52, 30 August 2013 (UTC)
  
:Pluto was discovered in 1930, and has since been the ninth body to be discovered and classified as a "planet". The sentence is a temporal rather than spatial reference, if that clears up any confusion. [[User:Thokling|Thokling]] ([[User talk:Thokling|talk]]) 12:04, 24 September 2013 (UTC)
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:Pluto was discovered in 1930, and has been since the ninth body to be discovered and classified as a "planet". The sentence is a temporal rather than spacial reference, if that clears up any confusion. [[User:Thokling|Thokling]] ([[User talk:Thokling|talk]]) 12:04, 24 September 2013 (UTC)
  
 
::Actually, no. Using the temporal definition, Pluto would be number 13. It was discovered after Ceres, Pallas, Juno and Vesta, which were discovered, named and classified, but then quickly demoted, all about 120 years before Pluto. This was due to the fact that telescopes of the day were strong enough to see quite a bit of the asteroid belt in a relatively short time, unlike with the "previously mythical" Kuiper belt.  
 
::Actually, no. Using the temporal definition, Pluto would be number 13. It was discovered after Ceres, Pallas, Juno and Vesta, which were discovered, named and classified, but then quickly demoted, all about 120 years before Pluto. This was due to the fact that telescopes of the day were strong enough to see quite a bit of the asteroid belt in a relatively short time, unlike with the "previously mythical" Kuiper belt.  
::Also, if any thing, the spatial discrepancy should be between eighth and ninth, as Pluto's orbit is squeezed enough to be inside that of Neptune, but long enough to extend outside it. Charon, Pluto's "moon" may cause additional worry, but is usually ignored.  
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::Also, if any thing, the spacial discrepancy should be between eighth and ninth, as Pluto's orbit is squeezed enough to be inside that of Neptune, but long enough to extend outside it. Charon, Pluto's "moon" may cause additional worry, but is usually ignored.  
::Anonymous 01:11, 4 December 2013 (UTC)
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:::Anonymous 01:11, 4 December 2013 (UTC)
 
 
:::I think this interpretation is a bit deliberately obtuse. Ceres wasn't considered a planet at the same time that Pluto was, so Pluto was indeed the ninth planet for a period of time. There is no confusion here.
 
:::On another note, the Dawn and New Horizons probes have now given us a large world covered in volatile weather, with internally driven geology, and a smaller, more obviously non-spherical cratered ball of rock. A common sense definition of a planet would probably leave Ceres out. As for Vesta, nobody has ever considered that a planet, not even the "Pluto should still be a planet" crowd. Again, being deliberately contrarian doesn't usually shed any light on scientific questions. [[Special:Contributions/108.162.250.158|108.162.250.158]] 03:38, 18 April 2016 (UTC)
 
 
 
 
:I think we would all be happy if the astronomers would come up with a definition of a planet that reasonably included Pluto but reasonably excluded the other 'candidates' that have been found so far.  You know, the ones without large moons. Or Pluto could just be grandfathered in.  Exactly how would science be held back by this??  [[Special:Contributions/108.162.219.223|108.162.219.223]] 00:00, 4 January 2014 (UTC)   
 
:I think we would all be happy if the astronomers would come up with a definition of a planet that reasonably included Pluto but reasonably excluded the other 'candidates' that have been found so far.  You know, the ones without large moons. Or Pluto could just be grandfathered in.  Exactly how would science be held back by this??  [[Special:Contributions/108.162.219.223|108.162.219.223]] 00:00, 4 January 2014 (UTC)   
 
:You don't think they tried to find a standard that included Pluto and excluded the others? Also grandfathering makes the idea of making a standard definition useless. {{unsigned ip|108.162.250.162}}
 
:You don't think they tried to find a standard that included Pluto and excluded the others? Also grandfathering makes the idea of making a standard definition useless. {{unsigned ip|108.162.250.162}}
:: For my part, I never understood why it was such an issue to not have the other things that are now dwarf planets classified as planets. More planets are cool, aren't they? They could have used whatever cut they made between dwarf planets and other stuff as a boundary definition for planets and promoted them instead of de-classifiying Pluto. You could then have split the category "planets" into "insert-cool-name-here"-planets and dwarf planets and voilà, more planets AND congruent definition. Also, less confusing nomenclature, as with the present definition dwarf planets aren't planets, even though the name makes it appear as if they are a subcategory of planets. I totally get why Pluto should be in a separate category from the other large planets. [[Special:Contributions/162.158.91.95|162.158.91.95]] 11:46, 19 October 2017 (UTC)
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::I always assumed the decision was aesthetic. They were faced with a choice between eight well-known planets with familiar names and distinctive characteristics that fit neatly on a poster and dozens or hundreds of planets, mostly obscure lumps of rock or ice.
 
  
 
The airplane/treadmill question is actually hard to define properly. In real case scenario, the plane would of course take off, but you can keep it in place if you assume really fast treadmill (much faster that the plane), friction in airplane wheels and that those wheels won't break off, catch fire or otherwise get destroyed under the stress much higher they are developed for. Oh, wait, actually the airplane WONT take off if the wheels break. :-) -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 12:01, 5 December 2013 (UTC)
 
The airplane/treadmill question is actually hard to define properly. In real case scenario, the plane would of course take off, but you can keep it in place if you assume really fast treadmill (much faster that the plane), friction in airplane wheels and that those wheels won't break off, catch fire or otherwise get destroyed under the stress much higher they are developed for. Oh, wait, actually the airplane WONT take off if the wheels break. :-) -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 12:01, 5 December 2013 (UTC)
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[[User:Weatherlawyer| I used Google News BEFORE it was clickbait]] ([[User talk:Weatherlawyer|talk]]) 02:14, 31 January 2015 (UTC)
 
[[User:Weatherlawyer| I used Google News BEFORE it was clickbait]] ([[User talk:Weatherlawyer|talk]]) 02:14, 31 January 2015 (UTC)
 
Highly recommend this book for the fascinating inside account of how Pluto became a not-planet! {{w|How I Killed Pluto and Why It Had It Coming}} [[User:L-Space Traveler|L-Space Traveler]] ([[User talk:L-Space Traveler|talk]]) 01:57, 1 September 2022 (UTC)
 
:Evidently, someone didn't like the way I did my link and changed it; athough it looks the same, it now no longer goes to the page that I had originally linked to. [[User:L-Space Traveler|L-Space Traveler]] ([[User talk:L-Space Traveler|talk]]) 11:51, 1 September 2022 (UTC)
 
::They didn't realise (or check) that the "It" had a different case, it looks like. This should be back to normal (without the unnecessary padlock graphic or excess markup text). [[Special:Contributions/172.70.91.128|172.70.91.128]] 17:34, 1 September 2022 (UTC) - oh hello... That editor lucked on exactly the same Cloudflare gateway as me. And I also didn't realise I was overpasting the corrected link onto the already corrected link. I just checked my own edit work, once I saw how the prior editor hadn't, so missed that you'd already worked it out... :P
 

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