explain xkcd - User contributions [en]

2980: Lava Lakes

2024-09-03T02:44:00Z

CAVincent:

{{comic
| number = 2980
| date = September 2, 2024
| title = Lava Lakes
| image = lava_lakes_2x.png
| imagesize = 709x272px
| noexpand = true
| titletext = Hey, golf balls float on lava, so this should make recovering them from the hazards easier.
}}

==Explanation==
{{incomplete|Created by A GOLF BALL <s>FLOATING ON</s> MELTING IN THE 6TH LAVA LAKE (FORMER MINIGOLF COURSE) - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
The comic shows [[Megan]] and [[Black Hat]] talking about lava lakes in volcanoes, when Megan mentions a common myth that in the craters of every volcano, there's a lava lake. She points out that there are really only around five lava-filled volcano craters in the world right now. Black Hat responds to this by creating a new one on a nearby golf course. However, given that Megan was still waiting when Black Hat came back, the attention span of most people is shorter than the time it takes lava lakes to form,{{citation needed}} and that sane people do not build golf courses directly over active volcanoes,{{Citation Needed}} Black Hat would've needed to dig at least 8 kilometers of earth within a very short timespan, which is impossible for a normal human being.{{citation needed}} Also, since this action was prompted by Megan's remark, Black Hat could not have built or moved anything capable of making a lava lake to the golf course beforehand.

The title text mentions that golf balls will float on lava, making recovering them from hazards easier. The density of a normal golf ball is about 1.13 grams per cubic centimeter, which is significantly less than the 2.4 ~ 2.9 grams per cubic centimeter of lava. It would be
very easy to retrieve golf balls from lava because of this, if it were not for the fact that lava is hot.{{Citation Needed}} Lava is around 800 C, while golf balls melt at ~80 C, making retrieving the burnt/melted/boiling/evaporated golf balls from said lava quite difficult.

These may be the 5 volcano lakes that the comic references ({{w|Lava_lake#List_of_volcanoes_having_displayed_past_or_present_lava_lake_activity|source}}):
* {{w|Erta Ale}} in Ethiopia
* {{w|Mount Erebus}} on Ross Island, Antarctica
* Kīlauea {{w|Halema%CA%BBuma%CA%BBu|Halemaʻumaʻu}} on Hawaiʻi (Big Island)
* {{w|Mount_Nyiragongo|Nyiragongo}} in the Democratic Republic of the Congo
* {{w|Mount Michael}} on Saunders Island, South Sandwich Islands

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[Megan and Black Hat are talking, with Megan holding up one hand towards Black Hat]
:Megan: People think volcano craters are full of lava, but that’s rare. There are only five or so lava lakes in the world right now.

:[Black Hat puts one hand up to his chin]
:Black Hat: Interesting.

:[Black Hat walks out of frame off to the right]

:[Megan stands while three distinct sound effects come off-panel from the right]
:Rumble
:Crash
:BOOOOM

:[Black Hat walks back into frame]
:Megan: What did you-
:Black Hat: There are six now.
:Off-panel voice to the right: Why is the golf course erupting!?

{{comic discussion}}

[[Category:Comics featuring Megan]]
[[Category:Comics featuring Black Hat]]
[[Category:Volcanoes]]

2978: Stranded

2024-08-30T03:12:17Z

CAVincent: "making fun of" -> referencing

{{comic
| number = 2978
| date = August 28, 2024
| title = Stranded
| image = stranded_2x.png
| imagesize = 219x323px
| noexpand = true
| titletext = At least they're not alone down there.
}}

==Explanation==
{{incomplete|Created by TWO ASTRONAUTS THAT ARE ABSOLUTELY NOT STRANDED NOSIREE - Please change this comment when editing this page. Do NOT delete this tag too soon.}}

This comic is referencing the {{w|Boeing Starliner}}, which launched for its Crewed Flight Test on June 5th, 2024. The mission to the {{w|International Space Station}} was originally scheduled for only eight days, but as of the comic’s release, August 28, 2024, the astronauts [https://en.wikipedia.org/wiki/Barry_E._Wilmore Butch Wilmore] and [https://en.wikipedia.org/wiki/Sunita_Williams Suni Williams] are still "stranded" on the ISS, not expected to return to Earth until February 2025.

The comic points out that being stranded is a matter of perspective and circumstances; people on Earth could equally be considered "stranded", unable to get off the planet. Many science fiction stories deal with some sort of rush to evacuate the Earth, though there's usually a reason why they would wish to leave, a reason that's notably absent in the comic. Moreover, the proposed solution of one rocket would not be able to bring all 8 billion people on Earth to space.{{cn}}

The comic is also referencing the fact that during press conferences, NASA has stressed that the Starliner astronauts are not actually stranded, because there are procedures for emergency returns to Earth. However, the current circumstances are not dire enough to warrant this emergency procedure.

The title text references commentators saying that at least the Starliner crew aren't alone up there, as there are currently nine people aboard the ISS, but flips it around to be about the (8 billion) people on Earth. Another funny take on the title text would be that in the turbulent times the fact that one is "stranded" like this might even be a benefit. The 8 billion people are also not alone in the sense there are numerous other species on Earth.

==Transcript==
:[Two astronauts, Megan and Cueball, are shown floating in the cabin of a space station, Megan near the top and Cueball near the bottom. Various miscellaneous devices and features are visible, all across the inner walls of the space station, as well as a large round window through which they can see some of the Earth's surface. Three white shapes are visible that could represent landmasses in a large body of water, bodies of water in/around a landmass or possibly weather systems.]
:Megan: Until they get another rocket ready to launch, 8 billion people are stranded down there.

{{comic discussion}}

[[Category:Comics featuring Megan]]
[[Category:Comics featuring Cueball]]
[[Category:Space]]

2712: Gravity

2022-12-17T06:55:04Z

CAVincent: /* Spoiler Alert! */ the shipwreck is a reference to this https://genius.com/Gordon-lightfoot-the-wreck-of-the-edmund-fitzgerald-lyrics but I don't know how to properly do the link

{{comic
| number = 2712
| date = December 16, 2022
| title = Gravity
| image = gravity_2x.png
| imagesize = 740x700px
| noexpand = true
| titletext = It's a long way down.
}}

*To experience the interactivity, visit the [http://xkcd.com/2712/ original comic].
==Explanation==
{{incomplete|Created by HOTBLACK DESIADO’S TAX RETURNS - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
In this interactive comic, the viewer pilots a small spaceship throughout a vast area in space. The viewer is capable of exploring various bodies and planets within the play area, many containing easter eggs alluding to What If? 2 and previous xkcd comics. The flight mechanics are largely, if not entirely Newtonian, so the player vessel is capable of using the gravity of planets to alter its trajectory or even enter orbit. The player's spaceship has several indicator circles around it which appear when a gravitational body comes into range, showing the direction towards their center of gravity.

Throughout the play area are coins that change your rocket ship into different rockets and even non-space based vehicles, including humans.

The comic was released as a promotion for Randall's new book [https://xkcd.com/what-if-2/ What If? 2], which was released in September and is available for purchase. Many of the planets contain references to various What If? articles.

The comic is similar to [http://xkcd.com/1608/hoverboard hoverboard], which celebrated Thing Explainer instead.

===Spoiler Alert!===

The following is an incomplete table of features:

{|class="wikitable sortable"
!
!
!
! colspan="4"|References
!
|-
! Description
! Transcript
! Tiles (X, Y)
! What If
! XKCD
! Movies
! Other
! Explanation
|-
|'''Earth'''
|
|(14360, 14360)
|
|
|
|
|The starting planet. The player begins on the launch pad in a landed position.
|-
|'''Europa'''
|
|(13180, -2540)
|
|
|
|
|Europa, one of Saturn's many moons (in real life). A broken, icy crust has a single path into its core.
|-
|Europa's crust
|"It's so unfair we don't get to compete in EuroVision."
"The region of the solar system where liquid water can exist on the surface is the habitable zone, and the region where it can exist beneath the surface of moons is the Eurozone."

"WHIRRRR"
|
|Y
|
|
|
|Europa's crust, with a single entrance into the core demarcated by an octopus leaving a hole.
Cueball states that Europa is in the Eurozone, a pun on the ''other'' Eurozone, with liquid underneath its surface.

A roomba whirs across the icy crust.

Cueball has a hairdryer and is melting the surface of the crust. A direct reference to [https://what-if.xkcd.com/35/ What If's Hairdryer].
|-
|Europa's core
|
|
|
|
|
|
|A watery ocean with octopi looking out into the great unknown using telescopes. This is a reference to octopi's intelligence here on earth! There's also a secret path leading to a book club, through the wreck of the Edmund Fitzgerald.
|-
|'''B-612'''
|"Asteroid deflection mission to earth. The package is delivered. Commencing planetary threat neutralization."
|(2610,3700)
|
|Y
|
|
|A reference to [https://xkcd.com/618/ Asteroid]. The little prince is having his asteroid blown up as it was heading towards Earth, apparently.
|-
|'''Dog park planet'''
|
|(1240, 11230)
|
|
|
|
|A planet with a dog park. Covered in dogs, along with dog walkers and some fences. There's a hole being dug by two dogs and a dog bone empty space in the center.
|-
|'''What If? 2 scenario planet'''
|
|
|
|
|
|
|
|-
|'''The Sun'''
|
|(-14950, 12080)
|
|
|
|
|Difficult to escape from if you hit the core.
|-
|Sun's core
|
|
|Y
|
|
|
|Difficult to escape from. Can be escaped by rotating around the sun until an escape-like velocity could be reached.
|-
|'''Soupiter'''
|
|(-800, -9040)
|Y
|
|
|
|A planet made of soup, with a core. As commented by Cueball, noodle soup. Has several small versions of other planets floating around it.
|-
|'''Earth without Japan'''
|
|(-7680, -5850)
|Y
|
|
|
|Earth, except it's missing japan.
|-
|'''Just Japan'''
|
|
|Y
|
|
|
|
|-
|'''A blob labeled "Pigeons"'''
|
|(-9020, -2490)
|
|
|
|
|
|-
|'''Starship Enterprise'''
|
|
|
|
|Y
|
|Star Trek reference
|-
|'''Dinosaur planet'''
|
|
|
|
|Y
|
|An homage to [https://www.qwantz.com/ Dinosaur Comics], a webcomic Randall has mentioned several times before. All the dinosaurs on the planet are black-and-white versions of the clip art dinosaurs in that comic. Also references the Jurassic Park movies, in which the long grass depicted is a plot point in later films.
|-
|'''What If? 1 scenario planet'''
|
|
|
|
|
|
|
|-
|'''Cat blocking traffic flowing through portals'''
|
|
|
|
|
|
|
|-
|'''Edge of the Universe'''
|
|
|
|
|
|
|It's actually just a planet labeled "edge of the universe", since there's no real edge.
|-
|'''A tree larger than the planet it's growing on'''
|
|
|
|Y
|
|
|May be a reference to [https://www.explainxkcd.com/wiki/index.php/2:_Petit_Trees_(sketch) Petit Trees].
|-
|'''Milliways'''
|
|
|
|
|Y
|
|Hitchhiker's guide to the galaxy reference
|-
|'''The Great Attractor'''
|
|
|
|Y
|
|
|
|-
|'''Present'''
|
|(22820,-18920)
|
|Y
|
|
|The XKCD cast react to giving each other What if 2? as a present.
|-
|'''Black hole cluster'''
|
|
|
|
|
|
|A cluster of black holes with extremely high gravitational strength, set to the maximum of 2048. Not particularly easy to land on with multiple conflicting gravitational fields, but once landed on, rather difficult to escape.
|}

==Data Dump==

extracted from a JSON blob near the bottom of <code>https://xkcd.com/2712/comic.js</code>.
I believe this to be all the data but i'm not sure. this should probably be on a different page but i'll leave that up to the smart people
<pre style="height:10em;overflow-y:scroll;">
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</pre>

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

Welcome!

To celebrate the world of what if? 2, here is your very own planet to explore!

Give someone the science question-and-answer book what if? 2 for Christmas:
xkcd.com/whatif2

{{comic discussion}}
[[Category:Space]]
[[Category:Book promotion]]
[[Category:Interactive comics]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]