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Explain xkcd: It's 'cause you're dumb.
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__NOTOC__{{DISPLAYTITLE:explain xkcd}}
 
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<font size=5px>''Welcome to the '''explain [[xkcd]]''' wiki!''</font>
 
  
We have collaboratively explained [[:Category:Comics|'''{{#expr:{{PAGESINCAT:Comics|R}}-9}}''' xkcd comics]],
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<font size=5px>''Welcome to the '''explain [[xkcd]]''' wiki!''</font><br>
<!-- Note: the -10 in the calculation above is to discount subcategories (there are 8 of them as of 2013-02-27),
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We have an explanation for all [[:Category:Comics|'''{{#expr:{{PAGESINCAT:Comics|R}}-13}}''' xkcd comics]],
     as well as [[List of all comics]] and [[List of unexplained comics]], which is obviously not a comic page. -->
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and only {{#expr:{{LATESTCOMIC}}-({{PAGESINCAT:Comics|R}}-10)}}
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     as well as [[List of all comics]] and the pages it has been split across, which are obviously not comic pages.
({{#expr: ({{LATESTCOMIC}}-({{PAGESINCAT:Comics|R}}-10)) / {{LATESTCOMIC}} * 100 round 0}}%)
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    The extra one difference corresponds to 404, which is not really a comic, even though we've categorised it so.
remain. '''[[Help:How to add a new comic explanation|Add yours]]''' while there's a chance!
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-->
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and only {{PAGESINCAT:Incomplete explanations|R}}
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({{#expr: {{PAGESINCAT:Incomplete explanations|R}} / {{LATESTCOMIC}} * 100 round 0}}%) [[:Category:Incomplete explanations|are incomplete]]. Help us finish them!
 
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== Latest comic ==
 
== Latest comic ==
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<div style="float:right; margin: 0 0 1em 1em">{{Special:ContributionScores/10/7/nosort,notools}}<div style="font-size:0.85em; width:25em; font-style:italic">[[Special:ContributionScores|Lots of people]] contribute to make this wiki a success. Many of the recent contributors, listed above, have just joined. You can do it too! Create your account [[Special:UserLogin/signup|here]].</div></div>
 
<div style="float:right; margin: 0 0 1em 1em">{{Special:ContributionScores/10/7/nosort,notools}}<div style="font-size:0.85em; width:25em; font-style:italic">[[Special:ContributionScores|Lots of people]] contribute to make this wiki a success. Many of the recent contributors, listed above, have just joined. You can do it too! Create your account [[Special:UserLogin/signup|here]].</div></div>
  
You can read a brief introduction about this wiki at [[explain xkcd]]. Feel free to sign up for an account and contribute to the wiki! We need explanations for comics, characters, themes, memes and everything in between. If it is referenced in an [[xkcd]] web comic, it should be here.
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You can read a brief introduction about this wiki at [[explain xkcd]]. Feel free to sign up for an account and contribute to the wiki! We need explanations for comics, characters, themes, memes and everything in between. If it is referenced in an [[xkcd]] web comic, it should be here.
  
* If you're new to wikis like this, take a look at these help pages describing [[mw:Help:Navigation|how to navigate]] the wiki, and [[mw:Help:Editing pages|how to edit]] pages.
+
*If you're new to wikis like this, take a look at these help pages describing [[mw:Help:Navigation|how to navigate]] the wiki, and [[mw:Help:Editing pages|how to edit]] pages.
  
* Discussion about various parts of the wiki is going on at [[Explain XKCD:Community portal]]. Share your 2¢!
+
*Discussion about various parts of the wiki is going on at the [[explain xkcd:Community portal|Community portal]]. Share your 2¢!
  
* [[List of all comics]] contains a complete table of all xkcd comics so far and the corresponding explanations. The missing explanations are listed [[List of unexplained comics|here]]. Feel free to help out by creating them! '''[[Help:How to add a new comic explanation|Here's how]]'''.
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*[[List of all comics]] contains a table of most recent xkcd comics and links to the rest, and the corresponding explanations. There are incomplete explanations listed [[:Category:Incomplete explanations|here]]. Feel free to help out by expanding them!
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*We sell advertising space to pay for our server costs. To learn more, go [[explain xkcd:Advertise Here|here]].
  
 
== Rules ==
 
== Rules ==
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If you want to talk about a specific comic, use its discussion page.
 
If you want to talk about a specific comic, use its discussion page.
  
Please only submit material directly related to —and helping everyone better understand— xkcd... and of course ''only'' submit material that can legally be posted (and freely edited.) Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.
+
Please only submit material directly related to —and helping everyone better understand— xkcd... and of course ''only'' submit material that can legally be posted (and freely edited).  Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.
  
 
If you need assistance from an [[explain xkcd:Administrators|admin]], post a message to the [[explain xkcd:Community portal/Admin requests|Admin requests]] board.
 
If you need assistance from an [[explain xkcd:Administrators|admin]], post a message to the [[explain xkcd:Community portal/Admin requests|Admin requests]] board.
  
 
[[Category:Root category]]
 
[[Category:Root category]]

Revision as of 17:59, 4 March 2014

Welcome to the explain xkcd wiki!
We have an explanation for all 2 xkcd comics, and only 18 (1%) are incomplete. Help us finish them!

Latest comic

Go to this comic explanation

Hertzsprung-Russell Diagram
The Hertzsprung-Russell diagram is located in its own lower right corner, unless you're viewing it on an unusually big screen.
Title text: The Hertzsprung-Russell diagram is located in its own lower right corner, unless you're viewing it on an unusually big screen.

Explanation

Ambox notice.png This explanation may be incomplete or incorrect: Created by a RED GIANT - Please change this comment when editing this page. Do NOT delete this tag too soon.

The Hertzsprung–Russell diagram is a scatterplot showing absolute luminosities of stars against its effective temperature or color. It's generally used to understand a star's age.

The axes are labeled in Kelvin (degrees Celsius above absolute zero) for effective temperature and, in a unlike many Hertzsprung–Russell diagrams, Watts for luminosity. While most Hertzsprung–Russell diagrams are labelled in units of solar luminosity or absolute magnitude, all three are perfectly valid measures of luminosity, which refers to the total power emitted by the star (or other body). Effective temperature refers to temperature of a blackbody with the same surface area and luminosity. This is meant to provide an estimate of the surface temperature of the object.

Regular Hertzsprung–Russell diagrams start at about 1000K and what is labeled on this diagram as 1021 watts—i.e. the upper-left corner. This diagram has been extended to lower magnitudes on both axes. The joke comes from the absurdity of showing tiny (at least compared to stars) and often mundane objects on a diagram meant for stars.

Though not included in the diagram, the title text notes that the screen displaying the diagram would probably be plotted somewhere in the lower right corner due to its (relatively) low brightness and heat output.

Item Effective Temperature Luminosity Explanation
Betelgeuse 3000 k 1031 W
Vega 10,000 K 1027 W
Sun 6000 K ~1026 W
Proxima Centauri
HD 189733b
Interior of a hydrogen bomb during detonation ~108 K
Jupiter
Venus
Earth
Mars
Moon
Nuclear Fireball
France
Europa
Lightning Bolt
Ivanpah Solar Plant Salt Tank
Medium-sized Lava Lake
Cruise Ship
Campfire
Blue Whale
Arc Lamp
Lightbulb
LED Bulb
Astronomer

Transcript

Ambox notice.png This transcript is incomplete. Please help editing it! Thanks.



Is this out of date? Clicking here will fix that.

New here?

Last 7 days (Top 10)

Lots of people contribute to make this wiki a success. Many of the recent contributors, listed above, have just joined. You can do it too! Create your account here.

You can read a brief introduction about this wiki at explain xkcd. Feel free to sign up for an account and contribute to the wiki! We need explanations for comics, characters, themes, memes and everything in between. If it is referenced in an xkcd web comic, it should be here.

  • Discussion about various parts of the wiki is going on at the Community portal. Share your 2¢!
  • List of all comics contains a table of most recent xkcd comics and links to the rest, and the corresponding explanations. There are incomplete explanations listed here. Feel free to help out by expanding them!
  • We sell advertising space to pay for our server costs. To learn more, go here.

Rules

Don't be a jerk. There are a lot of comics that don't have set in stone explanations; feel free to put multiple interpretations in the wiki page for each comic.

If you want to talk about a specific comic, use its discussion page.

Please only submit material directly related to —and helping everyone better understand— xkcd... and of course only submit material that can legally be posted (and freely edited). Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.

If you need assistance from an admin, post a message to the Admin requests board.