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| − | + | __NOTOC__{{DISPLAYTITLE:explain xkcd}} | |
| + | <center> | ||
| + | <font size=5px>''Welcome to the '''explain [[xkcd]]''' wiki!''</font><br> | ||
| + | We have an explanation for all [[:Category:All comics|'''{{#expr:{{PAGESINCAT:All comics|R}}-1}}''' xkcd comics]], | ||
| + | <!-- Note: the -1 in the calculation above is to discount "comic" 404, | ||
| + | which is not really a comic, even though we've categorised it so. --> | ||
| + | and only {{PAGESINCAT:Incomplete explanations|R}} | ||
| + | ({{#expr: {{PAGESINCAT:Incomplete explanations|R}} / {{LATESTCOMIC}} * 100 round 0}}%) [[:Category:Incomplete explanations|are incomplete]]. Help us finish them! | ||
| + | </center> | ||
| + | == Latest comic == | ||
| + | <div style="border:1px solid grey; background:#eee; padding:1em;"> | ||
| + | <span style="float:right;">[[{{LATESTCOMIC}}|'''Go to this comic explanation''']]</span> | ||
| + | <br clear="right"> | ||
| + | {{:{{LATESTCOMIC}}}}</div> | ||
| + | |||
| + | <small>''Is this out of date? {{Purge|Clicking here will fix that}}.''</small> | ||
| + | |||
| + | == New here? == | ||
| + | <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 [http://www.explainxkcd.com/wiki/index.php?title=Special%3AContributions&contribs=newbie 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 [[Special:UserLogin/signup|sign up for an account]] and contribute to the wiki! We need explanations for [[:Category:Incomplete explanations|comics]], [[:Category:Characters|characters]], [[:Category:Comics by topic|themes]] and [[:Category:Meta|everything in between]]. If it is referenced in an [[xkcd]] web comic, it should be here. | ||
| + | |||
| + | * If you're new to wiki editing, see the [[explain xkcd:Editor FAQ]] for a specific guidance to this Wiki and the more general help on [[mw:Help:Editing pages|how to edit wiki pages]]. There's also a handy {{w|Help:Cheatsheet|wikicode cheatsheet}}. | ||
| + | |||
| + | * Discussion about the wiki itself happens at the [[explain xkcd:Community portal|Community portal]]. | ||
| + | |||
| + | * You can browse the comics from [[List of all comics]] or by navigating the category tree at [[:Category:Comics]]. | ||
| + | |||
| + | * There are incomplete explanations listed [[:Category:Incomplete explanations|here]]. Feel free to help out by expanding them! | ||
| + | |||
| + | == 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 [[explain xkcd:Administrators|admin]], post a message to the [[explain xkcd:Community portal/Admin requests|Admin requests]] board. | ||
Revision as of 15:46, 16 January 2025
Welcome to the explain xkcd wiki!
We have an explanation for all 3230 xkcd comics,
and only 71
(2%) are incomplete. Help us finish them!
Latest comic
| Star Formation |
Title text: It's ok, I still have some nice, cool gas clouds that aren't collapsing. As long as nothing ionizes them, I can continue to enjoy their ... HEY! NO!!! |
Explanation
| This is incomplete: This page was created by a DIRECT COLLAPSE BLACK HOLE. Don't remove this notice too soon. If you can fix this issue, edit the page! |
This comic depicts a simplified model of how structure forms in the universe, then pushes it to an absurd extreme. In cosmology, small density variations in the early universe grow over time: regions with slightly higher density attract more matter via gravity, eventually forming gas clouds, stars, and galaxies. Pressure, driven by temperature, resists collapse, so the evolution of a cloud depends on the balance between gravitational attraction and internal pressure; this is often described by the Jeans instability criterion.
In the first panel, the on-screen narrator (with a passing resemblance to the time-travelling sphere and other speaking dots used in xkcd), an apparent creator of the universe, describes pressure waves moving through gas and causing it to clump. In the second, the clouds begin to collapse under gravity as more gas falls in. The third panel sees the outcome: as collapse proceeds, the gas heats up (via compression and radiation processes), increasing pressure and eventually sparking fusion. The comic depicts the formation of stars, something that we know this universe has done,[citation needed] with the implication that this was a totally unforeseen outcome for the manipulator or creator of this universe.
The final panel humorously frames this as the narrator lamenting the destruction of their "beautiful clouds," as the process has gone out of their control and produced a star instead of the desired (and perhaps, to their mind, more aesthetically pleasing) gently pulsating clouds.
The title text continues this joke by referencing the importance of ionization. "Cool" gas clouds (low temperature, neutral gas) can remain stable or collapse slowly. If they are ionized (for example, by nearby stars emitting ultraviolet radiation), the gas heats up, increasing pressure and preventing or disrupting collapse. The narrator hopes to preserve some of their own calm, neutral clouds but then reacts in horror as something ionizes them, ruining the delicate balance and ending their ability to "enjoy" stable gas clouds. But this is a natural result of star formation within and around a nebula again unforeseen by the being who apparently set up the circumstances that led to all the cosmic evolution we see.
Transcript
- [A black dot with star burst all around it is speaking, as indicated with a line from one of the burst lines to the text above it. Around the dot there are four larger and three small clouds. The one to the top right is somewhat larger than the other bigger ones.]
- Dot: I think I did a good job with this universe.
- Dot: Pressure waves dance through gas clouds.
- Dot: They clump together and then pressure pushes them apart.
- [In a fame-less panel the dot comments on the development as the largest cloud from seems to be gathering several other smaller clouds together. The other three larger clouds are still there, but there now seems to be some larger clouds stuck together in the upper right part, with more than ten smaller cloud either on top of these or moving in from all angles.]
- Dot: Oh weird, that big clump of clouds is staying together.
- Dot: Their gravity is overcoming the pressure and more gas is falling in.
- [The dot keeps commenting as the increasingly fragmentary clouds start to fall in streaks towards the original large cloud, which has now been compressed so it is smaller than before, but obviously are many more clouds stuck together. The larger clouds from before have begun to be drawn out and moving towards the larger.]
- Dot: It's not stopping!
- Dot: The heat is rising but the collapse is only accelerating!
- Dot: I messed up bad. I messed up bad.
- [The dot comments on the final result. There is now a shining star in place of the dense field of clouds, radiating strongly in all directions, blowing the few remaining smaller clouds around it, nine in total, away from it.]
- Dot: Noooooooo!!!
- Dot: My beautiful clouds!
- Dot: Ruined! It's all ruined!
Discussion
Make changes, try things out, or just have fun with the wiki here! Just leave everything above the line alone, please.
This is a test. PoolloverNathan[stalk the blue seas] 20:48, 16 March 2021 (UTC)
- This is not. —While False (museum | talk | contributions | logs | rights | printable version | page information | what links there | related changes | Google search | current time: 04:03) 18:38, 17 November 2022 (UTC)
- A foreign student asked me to help fight against his math teacher. That was unusual. He was in that class for just a couple of weeks. The teacher's phone number was sent to me. The student asked me to spam-call the teacher. 172.71.155.55 22:58, 18 September 2023 (UTC)
here i'm just messing around in html, ignore this
furhhfghure guyrburgryhuyvfr "rvhru"
interesting way of writing quotations xd
- hmmm this one of putting "<p>" in a line break will come in handy for when i want it to start at the same place than the first line
edit: da hek did that "</div>" come from An user who has no account yet (talk) 14:14, 13 October 2023 (UTC)
hi uh its hard to get here.
is this a reference to undocumented feature??? hmm... this is interesting.
108.162.241.216 02:05, 23 November 2023 (UTC)
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yum yum [citation needed]
Hiuiedeixgeyceiyedhcdiedcve {{trout}}
This is the leaderboard:<a href=" [AT THE JULY 28TH MEETING][tab] "Cancel the meeting! Our cover is blown."> More testing: hello doesthiswork (yesitdoes) This isn't a good name (talk) 22:44, 28 January 2026 (UTC)
hi 164.58.172.158 14:21, 23 February 2026 (UTC)
What is this?????????????????????? King Pando (talk) 04:25, 10 March 2026 (UTC)Is this out of date? .
New here?
Last 7 days (Top 10) |
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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 and everything in between. If it is referenced in an xkcd web comic, it should be here.
- If you're new to wiki editing, see the explain xkcd:Editor FAQ for a specific guidance to this Wiki and the more general help on how to edit wiki pages. There's also a handy wikicode cheatsheet.
- Discussion about the wiki itself happens at the Community portal.
- You can browse the comics from List of all comics or by navigating the category tree at Category:Comics.
- There are incomplete explanations listed here. Feel free to help out by expanding them!
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.
