explain xkcd - User contributions [en]

2201: Foucault Pendulum

2019-09-11T18:43:35Z

172.68.58.203: /* Explanation */

{{comic
| number = 2201
| date = September 11, 2019
| title = Foucault Pendulum
| image = foucault_pendulum.png
| titletext = Trust me, you don't want to get on the wrong side of the paramilitary enforcement arm of the International Earth Rotation and Reference Systems Service.
}}

==Explanation==
{{incomplete|Created by a BOT. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
Black hat is attending what appears to be a physics lecture. The professor is talking about the Foucault pendulum, a device which demonstrates the rotation of the Earth. Black Hat, being himself, sees an opprotunity to cause chaos and seizes it with both hands, quite literally - that is, he grabs the pendulum. The professor objects strongly to this, seemingly for fear of ruining the delicate demonstration. However, the news anchor in the final panel reveals to us that by arresting the motion of the pendulum, Black Hat has somehow stopped the rotation of the Earth. This is obviously blatantly impossible since the Foucault pendulum's motion is tied to the earth's rotation, not the other way round

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

{{comic discussion}}

2197: Game Show

2019-09-04T13:28:09Z

172.68.58.203: /* Explanation */

{{comic
| number = 2197
| date = September 2, 2019
| title = Game Show
| image = game_show.png
| titletext = Eventually they agreed to "an auto-retracting dog leash with one end clipped to your house, so you can press the button on the handle and water-ski home."
}}

==Explanation==
{{incomplete|Created by an UNHAPPY STATUE OF LIBERTY. Put title-text dog leash in list of Black Hat's items. Do NOT delete this tag too soon.}}

Many shows have situations where the participants are asked hypothetical questions. A common hypothetical question asked to ascertain what someone considers most important to them is the one item they would take to a deserted island -- to make the best of a boring situation.

[[Black Hat]] is on such a game show, and he does his best to undermine the intent of the question. Instead of answering with a favorite item -- such as his favorite album or book -- he lists various things (see [[#List of Black Hat's items|below]]), which he doesn't own and apparently expects the show's producers to provide him, starting with somewhat reasonable means of escape (e.g., a plane) to increasingly absurd items that appear to be chosen based on how difficult they would be to actually provide (e.g., the entire Atlantic Ocean). The items appear to follow Black Hat's stream of consciousness, starting with a boat, then a plane, then a distinctive plane, the bones of the pilot of that plane, the internal structure (similar to bones) of a famous landmark etc.

The title text reveals that the game show has ultimately acquiesced to one of Black Hat's wishes in a way: the dog leash mentioned would allow him to water-ski home, though such a dog leash is implausible (for example, a dog leash from San Francisco to Hawaii would be over 2000 miles long).

==List of Black Hat's items==
* A '''boat''', so he could sail home.
* A '''plane''', so he could fly home.
* '''{{w|Amelia Earhart|Amelia Earhart's}} plane'''. Moving from reasonable methods of escape to more absurd items, Black Hat requests a plane that is currently lost and may never be discovered. Amelia Earhart was a female U.S. aviator who went missing in the Pacific Ocean in 1937 on an attempt to circumnavigate earth. The search for her crash site has gone on sporadically since she disappeared, and there's still keen interest in finding her -- and coming up with interesting new ideas to guess where she crashed. This answer is a funny continuation of Black Hat's 2nd answer, a '''plane'''. Black Hat doesn't just want any plane, he wants a plane that was famous for going down in a unknown spot in the ocean. If the producers of the show were to provide Black Hat with the plane they would have to first surmount an unsolved problem (i.e., where is Amelia Earhart's plane).
* '''{{w|Amelia Earhart|Amelia Earhart's}} skeleton'''. Moving on from her plane, and being somewhat macabre in the process, Black Hat suggests Amelia Earhart's bones. Similar to her plane this would require the producers to find something that currently is not located. Also, given the biodegradability of bones there is perhaps a higher likelihood that the bones simply do not exist anymore, making the request potentially impossible.
* '''The internal structure of the {{w|Statue of Liberty}}''' was built by Gustave Eiffel, best known for his work on the Eiffel Tower. This is a continuation of the skeleton answer, as it is the internal support of the statue, similar to the function of human bones. This does not require the search that Amelia Earhart's plane (or bones) would require, but might be equally difficult given the status of the statue as a national symbol and given that the statue is on a guarded island. This is in addition to the logistical difficulties of transporting the internal structure of a large statue.
* '''The {{w|Crown Jewels of the United Kingdom}}''' are a continuation of the theme of national symbols. The Crown Jewels are ceremonial objects owned by the kings and queens of the UK. The items are kept under heavy guard and are valued at about $4 billion. Their acquisition would be nearly impossible; however, if they were acquired, it would result in an international hunt, which may help Black Hat escape the island.
* '''The entire television audience for the show''', so it wouldn't be deserted anymore -- and potentially to punish them for being entertained at the mean idea of having contestants be deserted on an island. If this is a popular channel/show, this could potentially be millions of people, all of whom have at least been exposed to the idea of making the most of a boring and potentially life-threatening situation. Then at least it would no longer be a deserted island, but of course it would be even more difficult to survive.
* '''The {{w|Greenland ice sheet}}''' is the body of ice covering the island of {{w|Greenland}}. As the second largest ice sheet on Earth, it could cause catastrophic environmental damage, ignoring the sheer magnitude of the task, which would be well beyond the capabilities of any television show and probably beyond the capabilities of an international effort.
* '''Earth's {{w|north magnetic pole}}''' is the point on earth toward which all compasses point because of magnetohydrodynamic ('[[1851: Magnetohydrodynamics|magic]]') forces in the earth's mantle. If all compasses were to suddenly point to his location, many scientists would investigate, they would converge on his deserted island, and Black Hat would be rescued. Moving the pole would be more difficult than moving the ice sheet, but it continues Black Hat's stream of consciousness in that it is a major geological feature of the planet.
* '''The {{w|Atlantic Ocean}}''' is another major geological feature. Moving it would be orders of magnitude more difficult than moving the Greenland ice sheet, and would cause abrupt and extreme changes to the planet's ecosystem. It is unclear how Black Hat would like the ocean delivered. If he wants it to remain an ocean separate from the Pacific, it would require a container of incredible size; if he simply wants the water, it would create a Sisyphean task unless the entire Atlantic Ocean was walled off from all other sources of water.

==Transcript==
:[Cueball, Black Hat, and Megan are game show contestants standing behind lecterns with Hairy standing in front of them as the game show host. Black Hat, standing in the middle of the three, is holding a finger up while speaking.]

:Black Hat: A boat. A plane. Amelia Earhart's plane. Amelia Earhart's ''skeleton''. The Statue of Liberty's internal support frame. The Crown Jewels. This show's entire television audience. The Greenland ice sheet. Earth's north magnetic pole.
:Black Hat: Am I in the Pacific Ocean?
:Black Hat: If so, the Atlantic Ocean.

:Hairy: Uhh.
:Hairy: Our producers are going to need some time on this one.

:[Caption below the panel:]
:The game show realized that they should have added some restrictions to their "take any item to a deserted island" challenge, but it was too late.

{{comic discussion}}

[[Category:Comics featuring Black Hat]]
[[Category:Comics featuring Hairy]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Comics featuring real people]]

Talk:2198: Throw

2019-09-03T23:22:46Z

172.68.58.203: added rewrite suggestion

I created this page as it seem DgbrtBOT fails because it is interactive. So far it still won't shown on the front page or with a button to it from the previous comic or the "newest" comic button. Maybe it just takes some time? It is now in the [[List_of_all_comics]] but still no luck getting it to work... --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 07:58, 3 September 2019 (UTC)
:Maybe it is because it was published on a tuesday? --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 08:16, 3 September 2019 (UTC)
::No it is not unusual that a comic does not come out on MWF. For instance the Sunday comic recently. Here is the list of Tuesday comics: [[:Category:Tuesday_comics]]--[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 13:29, 3 September 2019 (UTC)
:Also it doesn't display my comment below the explanation. Something is very broken here...--[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 08:25, 3 September 2019 (UTC)
:It appears now. [[User:PkmnQ|PkmnQ]] ([[User talk:PkmnQ|talk]]) 08:53, 3 September 2019 (UTC)
How did he get an estimate for Carly Rae Jepson, anyway? [[Special:Contributions/162.158.255.34|162.158.255.34]] 09:52, 3 September 2019 (UTC)
:https://www.youtube.com/watch?v=AgwAywJlo1M [[Special:Contributions/172.68.142.221|172.68.142.221]] 09:55, 3 September 2019 (UTC)
::Alternatively he could have worked together with her, as with Serena Williams. I will look it up in the afternoon, when I have my preordered book :) --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 10:22, 3 September 2019 (UTC)

By the transitive property of Worthiness, if Capt America can throw Thor's Hammer, surely George Washington is Worthy!{{unsigned ip|172.69.68.141}}

I got this data from the code:
{| class="wikitable"
! id
! name
! canThrow
! canBeThrown
! length
! diameter
! mass
! dragC
! throwPower
|-
| microwave
| A microwave oven
| false
| true
| 0.406
| 0.406
| 10.591
| 0.8
|
|-
| basketball
| a basketball
| false
| true
| 0.243
| 0.243
| 0.624
| 0.3
|
|-
| blender
| a blender
| false
| true
| 0.203
| 0.203
| 5.216
| 0.8
|
|-
| gold_bar
| a gold bar
| false
| true
| 0.0535
| 0.0535
| 12.4
| 0.8
|
|-
| cake
| a wedding cake
| false
| true
| 0.51
| 0.51
| 13
| 0.8
|
|-
| pingpong
| a ping pong ball
| false
| true
| 0.04
| 0.04
| 0.003
| 0.5
|
|-
| quarterback
| an NFL quarterback
| true
| false
| 1.905
| 0.584
| 102.058
| 0.6
| 20
|-
| acorn
| an acorn
| false
| true
| 0.0191
| 0.0191
| 0.0045
| 0.3
|
|-
| hammer
| thor's hammer
| false
| true
| 0.5
| 0.15
| 2000
| 0.4
|
|-
| javelin
| a javelin
| false
| true
| 1.8
| 0.0254
| 0.8
| 0.1
|
|-
| george
| George Washington
| true
| true
| 1.829
| 0.562
| 90.718
| 0.6
| 15
|-
| pikachu
| Pikachu
| true
| true
| 0.4
| 0.3
| 5.9874
| 0.4
| 10
|-
| car
| A car
| false
| true
| 4.5
| 2.134
| 1179.34
| 0.25
|
|-
| silver_spin
| a silver dollar (spinning)
| false
| true
| 0.04
| 0.011
| 0.027
| 0.5
|
|-
| silver_tumble
| a silver dollar (tumbling)
| false
| true
| 0.04
| 0.04
| 0.027
| 0.66
|
|-
| carly
| Carly Rae Jepsen
| true
| false
| 1.575
| 0.46
| 49.895
| 0.6
| 10
|-
| thor
| thor, god of thunder
| true
| false
| 1.91
| 0.59
| 91
| 0.6
| 10000
|-
| chris hemsworth
| chris hemsworth
| true
| false
| 1.91
| 0.59
| 91
| 0.6
| 10
|-
| squirrel
| A squirrel
| true
| true
| 0.203
| 0.096
| 0.454
| 0.6
| 10
|}
(Sorry if this table messes the talk page.)[[Special:Contributions/162.158.78.136|162.158.78.136]] 13:51, 3 September 2019 (UTC)
:Nah its great. Not sure how to use it in the explanation yet, but guess it will go in there somehow later.--[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 14:28, 3 September 2019 (UTC)

The comic looks different on my screen, not displaying multiple possible selections next to each other, but all below each other. Quite dynamic... --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 14:26, 3 September 2019 (UTC)
:If I zoom out I can make it shown only one item each line, but if I zoom in two is maximum. But it should go in the explanation when we get there.--[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 14:28, 3 September 2019 (UTC)

The suggestion to litteraly throw a party in the air could be a reference to The Hitchhiker's Guide To The Galaxy in which there is a flying building with a party in it, and there's even Thor partying in it when the protagonists are coming there. --Roger 15:12, 3 September 2019 (UTC)

Any reason why George Washington has 50% more throw power than Christ Hemsworth? Some reference? ~TK

Interesting, there appears to be additional units of measurement in the source code that were not used in the comic: "wiffles" and "light-nanoseconds" [[Special:Contributions/108.162.241.52|108.162.241.52]] 16:52, 3 September 2019 (UTC)

Does it seem... excessive to anyone else that the NFL quarterback can throw a silver dollar almost two football fields?[[Special:Contributions/172.68.142.161|172.68.142.161]] 17:08, 3 September 2019 (UTC)

The explanation for Manhattan block conversion appears to be wrong. They mention that their calculation for how large one block is was made with 4 numbers ignoring George Washington as an outlier. However there are 6 total examples of Manhattan block to use and George Washington's is not an outlier. I calculated the mean with all of the data to be 79.9142 meters.--[[User:Szeth|Szeth]] ([[User talk:Szeth|talk]]) 17:12, 3 September 2019 (UTC)

We need a table with a brief description of each thrower. [[User:DKMell|DKMell]] ([[User talk:DKMell|talk]]) 17:14, 3 September 2019 (UTC)

How do we know how old George Washington was when he throws a squirrel? Speaking of age, this format kind of reminds me of the Magnus comic: https://www.explainxkcd.com/wiki/index.php/1628:_Magnus [[Special:Contributions/108.162.241.52|108.162.241.52]] 17:41, 3 September 2019 (UTC)

I think we need to add something about the myth that George Washington threw a silver dollar across the Potomac River [[Special:Contributions/108.162.241.40|108.162.241.40]] 19:42, 3 September 2019 (UTC)

Pretty sure that the ping-pong ball distances are severely overestimated due to air resistance slowing them very rapidly. Someone with lab facilities might want to check... --[[User:Marcus Rowland|Marcus Rowland]] ([[User talk:Marcus Rowland|talk]]) 19:49, 3 September 2019 (UTC)
:Sorry, never mind, I think I saw a very early version of the actual page that had the distances much greater - seems reasonable now. --[[User:Marcus Rowland|Marcus Rowland]] ([[User talk:Marcus Rowland|talk]]) 19:53, 3 September 2019 (UTC)
The buttons look to be failing simply because [[Template:LATESTCOMIC]] hasn't been updated with the lastest comic number - the page is protected so needs someone with higher powers than I. [[User:Dresken|Dresken]] ([[User talk:Dresken|talk]]) 19:59, 3 September 2019 (UTC)
'Worthiness' was only a thing in the comics. In the myths Thor had a belt of strength and a couple other things. --[[Special:Contributions/172.69.33.125|172.69.33.125]] 21:35, 3 September 2019 (UTC)

Unless I am missing something there is a unit conversion error for pound and kilogram. For instance if you enter 1.83m and 90.7kg for "YOU" the throw distance by Thor is 137m. However, if you enter the equivalent weight of 200lb you get a throw distance of 183m.[[Special:Contributions/172.68.206.28|172.68.206.28]] 23:20, 3 September 2019 (UTC)

"An American football field (where Randall comes from) is 100 yards or 91.44 m long" Please rewrite. I don't think (and I humbly reserve the right to be wrong) that Randall did not come from a football field.

Talk:2175: Flag Interpretation

2019-07-12T16:27:11Z

172.68.58.203:

Something about a Dali-esque melting flagpole set at half-mast seems very suggestive to me...

Flying the US flag upside down would be considered a distress signal by many. Should this be in the main description or a "trivia" section? [[User:Cgrimes85|Cgrimes85]] ([[User talk:Cgrimes85|talk]]) 15:51, 12 July 2019 (UTC)

Half mast or half staff? In the US (which appears to be the flag shown in the comic), the popular usage is half-staff, although half-mast is more common elsewhere. [[User:Cgrimes85|Cgrimes85]] ([[User talk:Cgrimes85|talk]]) 15:56, 12 July 2019 (UTC)
: Half-mast should be for naval connotations and half-staff for non-naval connotations, at least in the USA.

Talk:2045: Social Media Announcement

2018-09-13T23:59:57Z

172.68.58.203: jfdkasdklfj5gks

I doubt it's Wil-Wheaton-specific. I've seen a fair number of people talk about quitting some form of social media or another (though usually not ALL of it); Wheaton's just the biggest (that I'm now aware of). [[Special:Contributions/162.158.75.202|162.158.75.202]] 12:00, 12 September 2018 (UTC)

Trivially amusing, I think "fewer" when I read "less nazis" in the explanation; this may make me a grammar Nazi, so instead of editing I'm pleading [[261: Regarding Mussolini]]. [[User:Elvenivle|Elvenivle]] ([[User talk:Elvenivle|talk]]) 18:56, 12 September 2018 (UTC)

'''GitHub'''

On June 4, 2018, Microsoft announced its intent to acquire GitHub. This means it isn't acquired yet. Thus I've removed it from the explanation. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 12:59, 12 September 2018 (UTC)
:It was confirmed as a done deal the same day. The purchase is already agreed upon, it will take some months for the merger to be completed. Even if that were not the case, github is still relevant to Microsoft's trend of buying up professional social media platforms. Adding it back in. [[Special:Contributions/108.162.219.220|108.162.219.220]] 17:44, 13 September 2018 (UTC)
::I totally agree about ''Microsoft's trend'' but it's still only an announcement. Wikipedia says: "The purchase is expected to close by the end of the year" and at [https://github.com/about/milestones GitHub (about; milestones)] they say in June 2018 "Microsoft announced it is acquiring GitHub". Sorry if I'm nitpicking, but right now GitHub is NOT owned by Microsoft while the explanation suggests this. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 18:55, 13 September 2018 (UTC)
:::It literally does not matter. [[Special:Contributions/162.158.126.82|162.158.126.82]] 22:28, 13 September 2018 (UTC)
:::This is like arguing that there was no war in 1939 because the British infantry didn't start shooting yet. The explanation text says nowhere that microsoft currently owns and operates github. It does list github as an example of a trend of Microsoft buying professional social media, which is the truth. This isn't nitpicking because there is no nit to pick. [[Special:Contributions/162.158.63.124|162.158.63.124]] 23:07, 13 September 2018 (UTC)

'''Texting'''

I'm pretty sure Texting is supposed to mean {{w|SMS}}. -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 22:12, 12 September 2018 (UTC)
:You are invited to write an additional alternative, I don't think there is something wrong or correct at this point. Your note makes sense. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 19:00, 13 September 2018 (UTC)

Is the Random button on xkcd.com broken for anyone else? [[Special:Contributions/172.68.90.70|172.68.90.70]] 18:45, 13 September 2018 (UTC)
:Yep, but not here! ;-) --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 19:00, 13 September 2018 (UTC)
::And I can tell why: It uses this link https://c.xkcd.com/random/comic/ but whois tells me: ''No match for "C.XKCD.COM".'' This means the domain "c.xkcd.com" is not registered. Randall should talk to his webmaster. --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 19:08, 13 September 2018 (UTC)
:Broken for me.

4: Landscape (sketch)

2018-09-10T09:37:23Z

172.68.58.203: Fix title: remove "4: ". How did you miss this when it was in the 10 comics numbered 1-10?

{{comic
| number = 4
| date = September 30, 2005
| title = Landscape (sketch)
| image = landscape_cropped_(1).jpg
| titletext = There's a river flowing through the ocean
}}

==Explanation==
The early comics sometimes do not present a particular point, but are just pictures drawn by [[Randall]].

There is a joke in the title text that a river, made of water, is flowing through the ocean, which is also made of water.

It is also worth noting that the sketch, when flipped vertically, maintains the appearance of having the sea on the bottom and sky on top, although the setting sun is on the wrong part of the horizon.

Similar to [https://en.m.wikipedia.org/wiki/Relativity_(M._C._Escher) works of M. C. Escher], this picture takes visual components of a typical scene and combines then in ways that appear to work well on a small scale, but would never combine that way in real life and do not make sense in the larger context of the image. The clouds are casting shadows on the sky.

[[File:Flipped sketch.jpg|thumb|Flipped sketch]].

==Transcript==
:[A sketch of a landscape with sun on the horizon. There is text from the checkered paper at the top:]
:From Page No.__

==Trivia==
*This was the 2nd comic originally posted to [[LiveJournal]].
**The previous was [[7: Girl sleeping (Sketch -- 11th grade Spanish class)]].
**The next was [[3: Island (sketch)]].
*Original title: "Landscape"
*Original [[Randall]] quote: "Don't ask me why there's a river running through the ocean. Please."
*This was one of the [[:Category:First day on LiveJournal|thirteen first comics]] posted to LiveJournal within 12 minutes on Friday September 30, 2005.
*This comic was posted on [[xkcd]] when the web site opened on Sunday the 1st of January 2006.
**It was posted along [[:Category:First day on xkcd|with all 41 comics]] posted before that on LiveJournal as well as a few others.
**The latter explaining why the numbers of these 41 LiveJournal comics ranges from 1-44.
*One of the original drawings drawn on [[:Category:Checkered paper|checkered paper]].

{{comic discussion}}
[[Category:Comics posted on livejournal| 02]]
[[Category:First day on LiveJournal| 02]]
[[Category:First day on xkcd]]
[[Category:Checkered paper]]

Talk:2038: Hazard Symbol

2018-08-27T14:14:57Z

172.68.58.203: Fixed formatting.

When on xkcd, the emoji only shows up as an empty square. On this site, it shows up as a sigma, caputal Y with umlauts, tilde, and decree symbol. What is it actually supposed to be? [[User:Smperron|Kestrel]] ([[User talk:Smperron|talk]]) 12:46, 27 August 2018 (UTC)
It's https://emojipedia.org/face-with-open-mouth-and-cold-sweat/ this emoji. Shows up correctly for me on the actual site on android but not on the wiki [[Special:Contributions/141.101.98.28|141.101.98.28]] 13:04, 27 August 2018 (UTC)

It shows up OK (Albeit small) on Mac OSX [[User:BSchildt|BSchildt]] ([[User talk:BSchildt|talk]]) 13:21, 27 August 2018 (UTC)

Does anyone know the source of the slippery symbol? The other symbols seem to be common to most standards, but the slippery symbol seems to have various designs. ☠☢☣⚡︎? [[Special:Contributions/162.158.62.57|162.158.62.57]] 13:52, 27 August 2018 (UTC)

: https://www.amazon.com/NMC-FS1-Double-Sided-CAUTION/dp/B009RVF1DY <-- This one on Amazon.com seems pretty close. [[Special:Contributions/172.68.58.245|172.68.58.245]] 14:13, 27 August 2018 (UTC)

2035: Dark Matter Candidates

2018-08-21T00:25:09Z

172.68.58.203: /* Explanation */ Added possible reason for bees running on dark matter

{{comic
| number = 2035
| date = August 20, 2018
| title = Dark Matter Candidates
| image = dark_matter_candidates.png
| titletext = My theory is that dark matter is actually just a thin patina of grime covering the whole universe, and we don't notice it because we haven't thoroughly cleaned the place in eons.
}}

==Explanation==
{{incomplete|Every section needs to be filled and explained. Do NOT delete this tag too soon.}}
{{w|Dark matter}} is a hypothetical form of matter used by the vast majority of astronomers to explain the far too high apparent mass of objects at large scales in our universe. In galaxies, stars are orbiting faster than the gravitational force of the sum of the masses of visible matter in the galaxy could cause, and entire galaxies are observed moving much faster around each other than their visible masses could explain. In galactic collisions, the mass can appear to separate from the visible matter, as if the mass doesn't collide but the visible matter does. A small handful of galaxies have been observed to not have this property, suggesting that it is a *thing* that a galaxy can have more or less of and is separable from. At scales of our solar system, those effects are too small and can't be measured. In cosmology, dark matter is estimated to account for 85% of the total matter in the universe.

This comic gives a set of possibilities for what dark matter could possibly be, charted by mass from smallest (given in {{w|Electronvolt#Mass|electronvolts}}) to largest (given in kilograms). Masses in the range 10-15 kg to 10-3 kg are given in grams together with appropriate prefixes, while the ton takes the place of 103 kg.

The joke in this comic is that the range of the mass of the possible particles and objects stretch over 81 powers of ten, with explanations suggested by astronomers covering only some portions of that range. [[Randall]] fills the gaps with highly absurd suggestions.

;Axion
An {{w|axion}} is a hypothetical elementary particle that might be a component of dark matter.

;Sterile neutrino
{{w|Sterile neutrino|Sterile neutrinos}} are hypothetical particles interacting only via gravity. It's an actual candidate for dark matter.

;Electrons painted with space camouflage
{{w|Electron|Electrons}} are fundamental particles which compose the outer layers of atoms. A large number of electrons in the galaxy would be relatively easy to detect, as they not only interact with light (which dark matter does not appear to), but also have a strong electric charge. Presumably, space camouflage is a positively-charged coating which prevents electrons from interacting with light. (Needless to say, this is not an actual candidate for dark matter.) The mass of an electron is about 0.5 MeV which fits well into the graph.

;Neutralino
A {{w|neutralino}} is a hypothetical particle from {{w|Supersymmetry|supersymmetry}}, not something made up by Randall Munroe that sounds vaguely like one. It's an actual candidate for dark matter.

;Q-ball
In theoretical physics, a {{w|Q-ball}} is a stable group of particles. It's an actual candidate for dark matter.

In billiards, a cue ball is the white (or yellow) ball hit with the cue in normal play. In addition, [[Cueball]] is the name explainxkcd uses for the most common xkcd character.

;Pollen
{{w|Pollen}} is a joke candidate, though people with seasonal allergies may suspect that the universe is genuinely made up entirely of pollen in the springtime.

;No-See-Ums
{{w|Ceratopogonidae|No-See-Ums}} are a family (Ceratopogonidae) of small flies, 1–4 mm long, that can pass through most window screens. Another joke candidate.

;Bees
Insects of the clade {{w|bee|Antophila}} are major pollinators of flowering plants. Their flight defies all known fixed wing physics. In recent years {{w|Colony collapse disorder|bees have been disappearing}} at an alarming rate; {{w|The Stolen Earth|Doctor Who explained}} that they are in fact aliens leaving Earth prior to a Dalek invasion.

;8-balls
In pool, the {{w|Pool (cue sports)|8-ball}} is a black ball numbered 8. It's a pun with Q-ball/cue ball. Unless undetected aliens have discovered billiards and become addicted to it, 8-balls are found only on Earth and are, hence, unlikely dark matter candidates.

;Space Cows
Cows are {{w|Bovinae|bovines}} extensively farmed on Earth for milk and meat. Although there is folklore concerning cows {{w|Hey diddle diddle|achieving circum-lunar orbits}}, not to mention their appearance on a {{w|Shindig (Firefly)|space western TV show}}, they have yet to be found elsewhere in the Universe.

;Obelisks, Monoliths, Pyramids
While those human constructions are huge on a human scale, they're negligible at universe-scale. It would take a large number of such constructions, distributed through space, to replicate the effects of dark matter; while a scenario could be envisioned where enough such constructs existed, with properties and distribution allowing them to match observations, this is obviously not a likely explanation.
They often show up in fiction and pseudo-scientific literature as alien artifacts generating immense unknown power out of nowhere, with the most famous and influential example being the three monoliths from {{w|2001: A Space Odyssey (film)|2001: A Space Odyssey}} (with the largest having a mass of about 500,000 tonnes).

;Black Holes ruled out by:
{{w|Black hole|Black holes}} are known to occur in sizes of a few sun masses (about 1030-1031 kg) as remnants of the core of former big stars, as well as in quite large sizes at the centers of galaxies (millions or even billions of sun masses). But recent gravitational wave detections indicate that black holes at 50 or 100 sun masses also exist, though their origin is still not understood. Randall doesn't mention this but some astronomers hope that these could fill at least a part of the gap.

Except the last item, all range below the mass of the sun (2x1030 kg) while the smallest known black hole is about four sun masses.
* Gamma rays: If dark matter were black holes of this size, the black holes would be evaporating in bursts of {{w|Hawking radiation}}, and we'd see a buzz of gamma rays from every direction.
* GRB lensing: {{w|Gamma-ray burst|Gamma-ray bursts}} (GRBs) are the brightest events in the universe and have been observed only in distant galaxies. While gravitational microlensing (see below) is an astronomical phenomenon, it doesn't make much sense here. GRBs are short (milliseconds to several hours) and are often detected only by space-borne sensors for gamma-rays -- rarely at any other wavelengths. Measuring lensing effects would be very difficult. This [https://arxiv.org/abs/1406.3102 paper] discusses the probability of detecting lensing effects caused by {{w|Dark matter halo|galactic halo objects}} among the known GRBs given sufficient objects to represent the missing mass.
* Neutron star data: {{w|Neutron star|Neutron stars}} aren't black holes, but they're also very small highly compact objects at about 1.4-2.16 solar masses. While black holes can't be observed directly, neutron stars are detectable in many wavelengths. The number of them gives a clue about the number of black holes close to the mass of the sun, a number which is far too low to make up dark matter.
* Micro lensing: {{w|Gravitational microlensing}} is a gravitational lens effect. This is a prediction by Einstein's {{w|General Relativity|Theory of General Relativity}} and was first confirmed in 1919 during a solar eclipse, when a star nearby the sun appeared closer to the sun than usual. Astronomers have found many so called {{w|Einstein ring|Einstein rings}} or Einstein crosses where a massive object in front of other galaxies bends the light toward us. Those massive objects may be black holes, but the number is far too low to explain dark matter.
* Solar system stability: Our {{w|Solar system|solar system}} is 4.5 billion years old and has been very stable since shortly after its formation. If not, we wouldn't exist. If dark objects at 1024 kg - 1030 kg (mass of Earth up to mass of Sun) accounted for dark matter and were distributed throughout galaxies, there should be many of them in the vicinity of our solar system and the system wouldn't be stable at all.
* Buzzkill Astronomers: Black holes above a certain size would be impossible to miss, due to the effects they have on nearby matter. But at the mass of some 1030 kg there must be many supernova remnants we still haven't found.

;Maybe those orbit lines on space diagrams are real and very heavy
Any diagram of our solar system (or any solar system) will show lines representing the path the planet takes around its sun. Since planets orbit in ellipses, there will be an ellipse for every planet. These lines don't show real objects, though. Astronomers just draw them on pictures of the solar system to show where the planets move. If you draw a line on a map to give someone directions, that line isn't an object in real life; it's just on the map. If these lines were real, they would be ''huge'' (Earth's would be 940 million km long (2π AU) and Neptune's would be 28 ''billion'' kilometers long). [https://www.youtube.com/watch?v=0fKBhvDjuy0 Powers of Ten (1977)] gives a good sense of just how large these orbit lines need to be in order to be visible in space diagrams. If these orbit lines were also very dense, they would have a huge mass and could possibly account for the missing 85% of the mass in the universe. But they would also constantly be impaling the planets, including the Earth, which would be a problem. Another joke candidate.

;Title text
The title text refers to the fact that space is just vast emptiness where a little bit dust could be overseen. Actually the mean density of detectable matter in the universe, according to NASA, is equivalent to roughly [https://map.gsfc.nasa.gov/universe/uni_matter.html 1 proton per 4 cubic meters]. And because this matter is mostly located in galaxies -- and inside there in stars and clouds -- the space between is even more empty. For comparison, one gram hydrogen consists of {{w|Avogadro constant|6.022 x 1023 atoms}}. Like at home wiping with a cleaning cloth in which we can see the dirt that wasn't clearly visible on the surface we have wiped, Randall believes that some few atoms more per cubic meter could stay undetected in the same way. This isn't true because in the space between galaxies astronomers can detect matter as it spreads over thousands or millions cubic light years. Atoms can't hide; there is always radiation.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:Dark matter candidates:
:[A line graph is shown and labeled at left quarter in eV and further to the right in g together with some prefixes.]
:[The labels read:]
:µeV, meV, eV, keV, MeV, GeV, TeV, 10-18kg, ng, µg, mg, g, kg, TON, 106kg, 1012kg, 1018kg, 1024kg, 1030kg

:[All items are shown in bars ranging between two approximately values:]
:< 1 µeV - 10 meV: Axion

:1 eV - 10 keV: Sterile neutrino

:0.5 MeV (exactly): Electrons painted with space camouflage

:10 GeV - 10 TeV: Neutralino

:100 TeV - 10-17 kg: Q-ball

:1 ng - 100 ng: Pollen

:0.1 mg - 1 mg: No-See-Ums

:10-1 g (exactly): Bees

:10 g - 100 g: 8-balls

:100 kg - TON: Space cows

:TON - 109 kg: Obelisks, monoliths, pyramids

:109 kg - 1033 kg: Black holes ruled out by:
::109 kg - 1013 kg: Gamma rays
::1013 kg - 1017 kg: GRB lensing
::1015 kg - 1022 kg: Neutron star data
::1021 kg - 1030 kg: Micro lensing
::1024 kg - 1030 kg: Solar system stability
::1030 kg - 1033 kg: Buzzkill astronomers

:1033 kg - >1036 kg: Maybe those orbit lines on space diagrams are real and very heavy

{{comic discussion}}

[[Category:Science]]
[[Category:Physics]]
[[Category:Astronomy]]
[[Category:Line graphs]]

2035: Dark Matter Candidates

2018-08-20T12:01:57Z

172.68.58.203: gamma rays

Talk:2002: LeBron James and Stephen Curry

2018-06-05T20:43:47Z

172.68.58.203:

I have no idea what this is about, but wondered if Stephen Curry was related to the Curry twins Tom and Ben, who are both over 6' - or to Tim, who isn't except in heels.
[[User:Arachrah|Arachrah]] ([[User talk:Arachrah|talk]]) 07:53, 4 June 2018 (UTC)
: Both LeBron James and Stephen Curry are famous NBA players. [[Special:Contributions/172.69.190.4|172.69.190.4]] 08:46, 4 June 2018 (UTC)
::How would you not know that? And even if you don't know who they are, you must have at least heard about them before, right? [[User:Herobrine|Herobrine]] ([[User talk:Herobrine|talk]]) 09:21, 4 June 2018 (UTC)
::: Not everyone is from USA. [[Special:Contributions/172.69.190.4|172.69.190.4]] 09:41, 4 June 2018 (UTC)
:::: That excuse could work, except your IP address is based in the USA :) [[User:Zachweix|Zachweix]] ([[User talk:Zachweix|talk]]) 12:01, 4 June 2018 (UTC)
::::: So is mine right now, but that doesn't mean I'm '''from''' here, and they didn't make us memorise every NBA player on the plane. (Hey cool, this IP has edited here before too) -[[Special:Contributions/162.158.186.60|162.158.186.60]] 15:36, 4 June 2018 (UTC)
:::: Basketball is the second most popular sport in the world [Citation needed], so it is safe to assume a large portion of the internet people know LeBron and Curry even if it is only by memes. {{unsigned ip|172.68.26.173}}
::: I like Curry. You know, the dish. And the actor. Tim, that is. [[User:Elektrizikekswerk|Elektrizikekswerk]] ([[User talk:Elektrizikekswerk|talk]]) 11:58, 4 June 2018 (UTC)
Not everyone in the USA follows sports. I've heard of LeBron James, but only in passing. The only Curry I know of is a fictional one from some old movie. {{unsigned ip|162.158.74.147}}
;Nate Silver

Nate Silver is famous for his numerical approach and extensive use of statistics and simulations.
He foresaw a probability of 28.6% for Donald to win the electoral college just before the election. That is a greater chance than most political commentators would have granted Donald. Typical betting sites saw Hillary 5:1 ahead at the evening of the election.
So I would not at all say that he got everything wrong in 2016. He predicted that Hillary would be a formidable number of votes ahead as most probable outcome, but also that many states would be very tight.
[[https://projects.fivethirtyeight.com/2016-election-forecast/]]. Sebastian --[[Special:Contributions/172.68.110.106|172.68.110.106]] 09:21, 4 June 2018 (UTC)

;Definitions needed
Hi! Could definitions be added for some of the terms used, such as "bleachers"? Thanks! [[Special:Contributions/162.158.155.200|162.158.155.200]] 11:30, 4 June 2018 (UTC)
: really?[[https://www.google.com/search?q=bleachers&client=firefox-b-1-ab&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjPv-v82LzbAhWLzlkKHUPVByAQ_AUICigB&biw=794&bih=941|really?]][[Special:Contributions/108.162.219.232|108.162.219.232]] 14:07, 5 June 2018 (UTC)
:: Glad someone said it before I did. [[Special:Contributions/172.68.58.203|172.68.58.203]] 20:43, 5 June 2018 (UTC)

;Magnetic North
I would have liked the "magnetic north" thing to be due to the geographical orientation of the teams home courts (if the Cavaliers are the only team to have a court that happens to be roughly north-south oriented, it would explain the higher points value). Looking at the Stupid Name Arena, however, it appears that the court inside is probably about NW-SE. Too bad. [[User:Chrullrich|Chrullrich]] ([[User talk:Chrullrich|talk]]) 14:15, 4 June 2018 (UTC)
: It is probably referencing how Lebron-led teams always make quick work of the perennially promising Toronto Raptors teams that call themselves "the North".

I was thinking that might be a reference to the Cleveland Cavaliers playing their home games at a slightly high latitude than the (San Fransico-based) Golden State Warriors. (However, they are nearly at the same latitude, and neither is anywhere near 75 degrees North) [[User:JamesCurran|JamesCurran]] ([[User talk:JamesCurran|talk]]) 19:24, 4 June 2018 (UTC)

;SSN to Free Throw%
Would it be too much of a stretch to add in the fact that Stephen Curry's point is highlighted on the chart, as a nod to the fact that (the majority of) one's SSN can actually be determined if one knows details about personal information such as where one was born? [[Special:Contributions/108.162.219.130|108.162.219.130]] 16:08, 4 June 2018 (UTC)
:Not anymore. My three kids were all born in the same hospital -- same wing; rooms only meters apart -- but have TOTALLY different SSN's. (No, I'm not sharing them as proof!) We even asked the local SS office what happened and they said they're starting to reuse numbers at random. I think it's not "reuse" as much as "reallocate", but either way the strict geographical basis is no longer valid. --'''BigMal''' // [[Special:Contributions/172.69.70.209|172.69.70.209]] 16:31, 4 June 2018 (UTC)
:Originally, the first three digits indicated the office where the person requested an SSN. It didn't really signify anything. It was just that each office was given on a block of numbers to assign, and that block all started with the same three digits. Since in the early days of Social Security, a person got theirs, not at birth, but when they first got a job, it was more of an indication of where they happened to be living then, rather than where they were born. By the 60s, SSN assignment had been centralized, but they still tried to maintain the regional number, based on the zip code of the person requesting an SSN. Apparently, they have more recently realized that's just a waste of time and just started issuing them sequentially. [[User:JamesCurran|JamesCurran]] ([[User talk:JamesCurran|talk]]) 19:17, 4 June 2018 (UTC)
::New method started in 2011, so until around 2029 we'll be able to use the "SSN to FT% in NBA" metric, and have it tie to location at time of SSN generation.[[Special:Contributions/162.158.74.165|162.158.74.165]] 21:37, 4 June 2018 (UTC)

Does anyone know what the "sandwiches" graph is a reference to? I don't believe I have heard anything about the Warriors and a love for sandwiches. [[Special:Contributions/172.68.46.101|172.68.46.101]] 17:03, 4 June 2018 (UTC)
:Maybe this? [[https://www.si.com/extra-mustard/2015/04/10/warriors-stephen-curry-45-point-game-sandwich]] [[Special:Contributions/162.158.62.39|162.158.62.39]] 17:23, 4 June 2018 (UTC)

;More on SSN to Free Throw%
I did a quick digitization of the SSN /FT% graph, and the Steph Curry point is at about FT% = 92.5% and SSN ~ 300-XX-XXXX, which corresponds to his 2018 ft% of 92.1% (from wikipedia) and his birthplace of Ohio having a SSN in the range of 268-302 https://www.ssofficelocation.com/social-security-number-prefix . Even if SSN prefixes are random now, they probably weren't when he was born 30 years ago, so it is probably safe to conclude that the location of the point is deliberate. [[User:Acflip|Acflip]] ([[User talk:Acflip|talk]]) 19:01, 4 June 2018 (UTC)
:They changed in 2011 to random generation. I doubt there's any 7 year old NBA players, so until 2029 we'll be able to use this -ahem- metric.[[Special:Contributions/162.158.74.165|162.158.74.165]] 21:34, 4 June 2018 (UTC)

;On the pog collection

Is it possible that the "pog collection" also refers to the player's collection of Player of the Game awards? Lebron James would surely have a staggering amount of it, and Steph Curry would have considerably less, since Steph Curry has a lot of other good teammates.
[[User:Skybreak|Skybreak]] ([[User talk:Skybreak|talk]]) 07:58, 5 June 2018 (UTC)Skybreak

;Best Sport

Lets be real here. The odds of them being better at a sport then basketball are basically nill. Unless you use an unusual definition of "sport" or "better".
[[Special:Contributions/108.162.219.232|108.162.219.232]] 14:07, 5 June 2018 (UTC)

;Shot Map

It may be a reference to the tunnel shot, but it's more likely just a joke about Steph Curry's unusual range for field goals. He's well known for making 3-point shots from much farther out than the average the NBA player. [[User:Hasown|Hasown]] ([[User talk:Hasown|talk]]) 14:57, 5 June 2018 (UTC)
:Thinking about it further, the map doesn't even show any shots from the tunnel, and the tunnel's placement is inaccurate as well. The tunnels to the locker rooms are in the corners of the court, not directly behind the hoop. There are always bleachers behind the hoop for fans to sit. [[User:Hasown|Hasown]] ([[User talk:Hasown|talk]]) 15:03, 5 June 2018 (UTC)
Jimmy Kimmel made a similar joke on TV last night, saying that Curry made a 3-pointer from the parking lot. Should Randall sue?
[[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 16:11, 5 June 2018 (UTC)