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__NOTOC__{{DISPLAYTITLE:explain xkcd}}
Make changes, try things out, or just have fun with the wiki here! Just leave everything above the line alone, please.
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<center>
[http://www.explainxkcd.com/wiki/index.php?title=explain_xkcd:Sandbox&action=edit&oldid=91667 clear sandbox]
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<font size=5px>''Welcome to the '''explain [[xkcd]]''' wiki!''</font><br>
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<span style="font size:210%;">We have an explanation for all [[List of all comics (full)|'''{{#expr:{{PAGESINCAT:All comics|R}}}}''' xkcd comics]], and only {{PAGESINCAT:Incomplete explanations|R}} ({{#expr: {{PAGESINCAT:Incomplete explanations|R}} / {{LATESTCOMIC}} * 100 round 1}}%) are incomplete. [[:Category:Incomplete explanations|Help us finish them!]]</span><!-- Note: the -1 in the calculation above has been removed (it was there to discount "comic" 404, but we've categorized it to be a comic and so has Randall.) -->
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<span style="text-shadow:0 0 6px black">[[<span style="font-size:11pt;color:#dddddd">Cueball</span>]]</span> <sup><span style="text-shadow:0 0 3px #000000">[[<span style="font-size:8pt;color:#dddddd">Knit Cap</span>]]</span></sup>
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=Latest comic=
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{{:{{LATESTCOMIC}}}}
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----
  
[[Cueball|<span style="text-shadow:0 0 6px black;font-size:11pt;color:#dddddd">Cueball]]</span> [[Knit Cap|<sup><span style="text-shadow:3px black;font-size:8pt;color:#dddddd">Knit Cap]]</span></sup>
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Recent comments: {{Special:RecentChanges|namespace=1}}

Latest revision as of 06:19, 3 January 2026

Welcome to the explain xkcd wiki!
We have an explanation for all 3209 xkcd comics, and only 60 (1.9%) are incomplete. Help us finish them!

 Go to this explanation

Latest comic[edit]

Chemical Formula
Some of the atoms in the molecule are very weakly bound.
Title text: Some of the atoms in the molecule are very weakly bound.

Explanation[edit]

Ambox warning blue construction.png This is incomplete:
This page was created by the carbon in the universe . Don't remove this notice too soon. If you can fix this issue, edit the page!

The supposed "chemical formula for the universe" merely lists the numbers of atoms of each element. As is common practice for real compounds that contain organic structures or substructures, the numbers of atoms of carbon and hydrogen are listed before all of the others; the others are listed in alphabetical order. There are estimated to be 1080 atoms of hydrogen (H), by far the most common element in the universe. The next most common element, helium (He), is a long way to the right in the list, and out of view, but would be about a third as many as the hydrogens.

These numbers are large, but they are not nameless. Using the short scale, these numbers can be described as:

  • C1076 - Ten quattuorvigintillion carbon atoms
  • H1080 - One hundred quinvigintillion hydrogen atoms
  • Ac1067 - Ten unvigintillion actinium atoms
  • Ag1069 - One duovigintillion silver atoms
  • Al1075 - One quattuorvigintillion aluminium atoms
  • Am1026 - One hundred septillion americium atoms
  • Ar1075 - One quattuorvigintillion argon atoms
  • As1070 - Ten duovigintillion arsenic atoms
  • At1047 - One hundred quattuordecillion astatine atoms
  • Au1069 - One duovigintillion gold atoms
  • B1071 - One hundred duovigintillion boron atoms
  • Ba1070 - Ten duovigintillion barium atoms
  • Be - An unknown quantity of beryllium atoms

The matter originally created in the Big Bang was unbound protons and neutrons. In the first few minutes, some of these combined to form lightweight nuclei, but most remained as protons, i.e. the nuclei of hydrogen atoms. Other, more complex atoms formed later as a result of stellar nucleosynthesis, up to atomic mass 56. Still more massive nuclei have been formed via supernova nucleosynthesis. Although the proportions of these atoms depend in a complex way on the fusion processes involved, and on the stabilities of those nuclei, the most massive atoms are generally both less favored to form and short-lived, so their elemental abundances in the universe are very small. As shown above, the number of americium (Am) atoms is much smaller than those of any other element in the visible part of the "formula". There are fewer atoms of americium in the entire universe than there are molecules of liquid water in 3.0 L.

This may be poking some fun at the relative usefulness (or rather, uselessness) of chemical formulas for large organic molecules. While it is a useful concept for teaching people about chemistry and balancing equations, and it was useful in the early days of chemistry to try to categorize and learn about molecules via stoichiometry - it does not give much useful information. For example even the simple formula C11H15NO2 has 302 registered isomers. Many of them are NOT good to eat.

Transcript[edit]

Ambox warning green construction.png This is one of 40 incomplete transcripts:
Don't remove this notice too soon. If you can fix this issue, edit the page!
[A long panel with a chemical formula trailing off the right side]
C1076 H1080 Ac1067 Ag1069 Al1075 Am1026 Ar1075 As1070 At1047 Au1069 B1071 Ba1070 Be
[Caption below the panel:] The approximate chemical formula for the universe



comment.png  Add comment      new topic.png  Create topic (use sparingly)     refresh discuss.png  Refresh 

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: 22:53) 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

Please beware that <p> on mediawiki also disables automatic paragraph breaks, so you need a closing </p> or you'll break automatic paragraph formatting for the rest of the page. Zmatt (talk) 22:06, 31 July 2024 (UTC)

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)

Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
Tomato soup.jpg Soup
yum yum [citation needed]

Hiuiedeixgeyceiyedhcdiedcve {{trout}}

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Lots of people contribute to make this wiki a success. Many of the recent contributors 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 create an account and contribute to the wiki! We need explanations for xkcd comics, characters, What If? articles, and everything in between. If it is referenced in an xkcd comic, it should be here.

  • The incomplete explanations are listed here. Feel free to help out by expanding them!

Rules[edit]

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 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.

Recent comments:

28 January 2026

N    22:46 

Talk:3200: Chemical Formula‎‎ (9 changes | history) . . (+2,084). . [TheusafBOT‎; DollarStoreBa'al‎; 2a00:6020:479f:6c00:d587:ac2a:d1e2:26a9‎; 2001:4c4e:1c09:ec00:7932:264e:a9e0:8ed0‎; 2001:41d0:8:5062::1‎; 2001:16b8:cc03:e100:8552:6543:7cf4:9ae7‎; 147.81.60.76‎; Dextrous Fred‎ (2×)]

     

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(cur | prev) . . (+113). . TheusafBOT (talk | contribs) (Created by theusafBOT: talk page for 3200)

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Talk:3199: Early Arthropods‎‎ (6 changes | history) . . (+118). . [82.13.184.33‎; 45.178.1.151‎; Elizium23‎ (2×); 82.132.238.49‎ (2×)]

     

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(cur | prev) . . (+181). . 82.132.238.49 (talk) (No justification given.)

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(cur | prev) . . (+1,980). . 82.132.238.49 (talk) (Nope.)

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(cur | prev) . . (+140). . 82.132.238.49 (talk) (Undo revision 404429 by Elizium23 (talk) A bit uncouth (*possibly* in jest), and has newlines that aren't needed, but not a reason to revoke it.)

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27 January 2026

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Talk:1492: Dress Color‎‎ (2 changes | history) . . (+119). . [81.179.199.253‎; 47.28.76.207‎]

     

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Talk:3199: Early Arthropods‎‎ (14 changes | history) . . (+2,277). . [Nitpicking‎; TheusafBOT‎; Megan‎; 81.179.199.253‎; 45.178.1.151‎; 2a02:a31a:e2cd:5300:5450:caaa:3f64:5ee5‎; 2601:246:4a00:3e80:7401:681f:825e:af7e‎; 160.39.41.199‎; Cphoenix‎ (2×); 82.13.184.33‎ (4×)]

     

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(cur | prev) . . (+558). . Cphoenix (talk | contribs) (Comment on early Cnidarians paralleling this comic's structure, with a reference to my published paper about a possible trigger for the Cambrian Explosion.)

     

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     14:21  Talk:2184: Unpopular Opinions‎ (diff | hist) . . (+189). . 2600:1700:3d40:70f0:850e:ebbf:618f:a9fc (talk)

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     01:21  Talk:1232: Realistic Criteria‎ (diff | hist) . . (+405). . 146.70.174.163 (talk)

26 January 2026

     11:57 

Talk:3198: Double-Pronged Extension Cord‎‎ (5 changes | history) . . (+992). . [213.55.233.114‎; 82.13.184.33‎ (4×)]

     

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