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[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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<!-- Go to this explanation button --><span style="position: absolute; right:0; padding-top:1.4em; font-size: 100%;"><span class="no-link-underline">[[{{LATESTCOMIC}}|&nbsp;</span>'''Go to this explanation''']]</span>
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=Latest comic=
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<span style="position: absolute; left:0; padding-top:1.35em; font-size: 105%;"><span class="no-link-underline">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[[File:new topic.png|21x21px|link={{LATESTCOMIC}}#Discussion]][[{{LATESTCOMIC}}#Discussion|&nbsp; </span>'''View comic discussion''']]</span><br><br></div>
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<div style="float:right; margin: 0 0 1em 1em">{{Special:ContributionScores/10/30/nosort,notools}}<div style="font-size:0.85em; width:28em; font-style:italic">[[Special:ContributionScores|Lots of people]] contribute to make this wiki a success. Many of the recent contributors above have [{{fullurl:Special:Contributions|contribs=newbie}} just joined]. You can do it too! Create your account [[Special:UserLogin/signup|here]].</div></div>
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You can read a brief introduction about this wiki at [[explain xkcd]]. Feel free to [[Special:UserLogin/signup|create an account]] and contribute to the wiki! We need explanations for xkcd [[:Category:Incomplete explanations|comics]], [[:Category:Characters|characters]], [[What If? chapters|''What If?'' articles]], and [[:Category:xkcd|everything in between]]. If it is referenced in an [[xkcd]] comic, it should be here.
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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 3212 xkcd comics, and only 60 (1.9%) are incomplete. Help us finish them!

 Go to this explanation

Latest comic[edit]

Binary Star
The discovery of a fully typographical star system comes with a big asterisk.
Title text: The discovery of a fully typographical star system comes with a big asterisk.

Explanation[edit]

Binary star systems, where two stars orbit each other, are common throughout the universe. In some cases, these are different types of stars, such as a neutron star orbiting a main sequence star. Here, however, the comic depicts a system consisting of a real celestial object (a main sequence star), and a star which has a stylised five-pointed shape in which stars are often drawn, called a pentagram.

Pointed stars do not actually exist as astronomical bodies.[citation needed] Stars seen in the night sky can sometimes appear as though they have spikes coming out of them, but these are just optical illusions caused by the diffraction spike effect.

The title text puns on the * symbol (an asterisk - meaning little star), which is sometimes called a star, and is often used to indicate footnotes in text. A "big asterisk" is used as a metaphor for a rather large caveat or significant reservations about the statement being made, suggesting that such qualifications would form a long footnote. This could be interpreted as meaning that the existence of the "typographical star system" is significantly doubtful. Alternatively, it could be read as meaning that the "big asterisk" is a physically very large (astronomical scale) punctuation symbol, which forms part of a system composed of other bodies in the form of typography.

Drawing a star as a pentagram, as shown in the comic, is referenced in 1029: Drawing Stars.

The orbital paths shown are anomalous. The main sequence star follows a path that's nearly circular, while the five-pointed star follows an elliptical path, and they're at different locations along their paths. If the two stars were the most massive objects in their system by a significant margin, approximating a two-body system, their paths should be the same shape (albeit at different sizes, if their masses differ) around the shared focal-point of their barycenter and their locations along those paths should be directly in (anti-)phase. This implies that there's at least one other massive object in the system, which isn't shown. The much smaller path of the main sequence star suggests that it's in a (relatively) close orbit with the other massive object, with the five-pointed star being much less massive than either, and essentially orbiting them both at a greater distance.

Transcript[edit]

Ambox warning green construction.png This is one of 43 incomplete transcripts:
Don't remove this notice too soon. If you can fix this issue, edit the page!
[Graphical depiction of a binary star system. The orbits are shown with dashed lines. One star is revolving circularly close to the center of mass and is shown as a filled circle. The other has a very elliptic orbit further out. It is currently close to its furthest point from the other star. This star is depicted as a pentagram.]
[Caption below the image:]
Space news: astronomers have found the first known system with a main-sequence star orbited by a five-pointed one.

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: 20:17) 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
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yum yum [citation needed]

Hiuiedeixgeyceiyedhcdiedcve {{trout}}

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New here?[edit]

Last 30 days (Top 10)

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:

5 February 2026

     19:33 

Talk:3201: Proof Without Content‎‎ (2 changes | history) . . (+293). . [81.179.199.253‎; 220.253.102.206‎]

     

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Talk:3203: Binary Star‎‎ (12 changes | history) . . (+2,200). . [Qwertyuiopfromdefly‎; TheusafBOT‎; Ralfoide‎; Barmar‎; 66.210.7.66‎; 2a12:f41:145b:1300:c59:505f:b2db:7572‎; 2a02:908:c30:5000:b86c:d747:e182:c327‎; 216.25.182.141‎; 2001:a62:5f7:fb01:bf80:8165:d7c9:b014‎; 115.70.50.73‎; 82.13.184.33‎ (2×)]

     

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(cur | prev) . . (+267). . Ralfoide (talk | contribs) (cosmic sans)

     

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(cur | prev) . . (+148). . Qwertyuiopfromdefly (talk | contribs) (commemt)

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(cur | prev) . . (+113). . TheusafBOT (talk | contribs) (Created by theusafBOT: talk page for 3203)

     18:13  Talk:1460: SMFW‎ (diff | hist) . . (+245). . 2001:4c4e:1c00:9a00:a04e:696d:d2c4:b69 (talk) (Simple Messaging Framework)
     12:47  Talk:2841: Sign Combo‎ (diff | hist) . . (+237). . 138.75.249.122 (talk)
     11:21  Talk:1029: Drawing Stars‎ (diff | hist) . . (+54). . 82.13.184.33 (talk)

     09:13 

Talk:3202: Groundhog Day Meaning‎‎ (3 changes | history) . . (+458). . [82.13.184.33‎; 24.177.125.170‎ (2×)]

     

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4 February 2026

     16:55 

Talk:3202: Groundhog Day Meaning‎‎ (5 changes | history) . . (+192). . [Lordpishky‎; 66.210.7.66‎; 82.13.184.33‎ (3×)]

     

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(cur | prev) . . (+10). . Lordpishky (talk | contribs) (fixed sig w/tildes)

     16:53  Talk:3196: Aurora Coolness‎ (diff | hist) . . (+105). . 164.58.172.158 (talk)
     01:56  Talk:xkcd: volume 0‎ (diff | hist) . . (+149). . 2600:1012:a124:7252:9484:da12:f04f:a111 (talk) (added link to solved puzzles)

3 February 2026

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Talk:3189: Conic Sections‎‎ (3 changes | history) . . (+671). . [BunsenH‎; 81.179.199.253‎ (2×)]

     

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(cur | prev) . . (+281). . BunsenH (talk | contribs) (Add a diagram back?)

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Talk:3202: Groundhog Day Meaning‎‎ (11 changes | history) . . (+3,257). . [81.179.199.253‎; 2a02:8071:60f0:67a0:e9dd:54d9:e9c0:2426‎; 24.255.31.134‎; 2001:638:807:507:d0dd:20bf:e52b:ccc4‎; Kynde‎ (2×); 82.13.184.33‎ (5×)]

     

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(cur | prev) . . (+973). . 81.179.199.253 (talk)

     

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(cur | prev) . . (+99). . 24.255.31.134 (talk) (Yellow pig day is also a weird holiday.)

     

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Talk:2174: First News Memory‎‎ (2 changes | history) . . (+2,259). . [Elizium23‎; 81.179.199.253‎]

     

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(cur | prev) . . (+589). . Elizium23 (talk | contribs) (Challenger disaster: new section)

     18:27  Talk:2288: Collector's Edition‎ (diff | hist) . . (+271). . This isn't a good name (talk | contribs) (this is on unixkcd, I haven't seen anyone mention it here.)
     14:02  Talk:3200: Chemical Formula‎ (diff | hist) . . (+974). . 88.84.156.245 (talk) (Abundance of Tc)
     06:50  Talk:3191: Superstition‎ (diff | hist) . . (+639). . 91.186.218.129 (talk) (superstitions can be a form of coping)

 m   06:30 

Talk:3201: Proof Without Content‎‎ (3 changes | history) . . (+76). . [Gorzog63‎ (3×)]

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(cur | prev) . . (+86). . Gorzog63 (talk | contribs) (Added an explanation of the validity of the proof)

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(cur | prev) . . (-10). . Gorzog63 (talk | contribs) (Added an explanation of the validity of the proof)

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