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		<updated>2026-06-27T19:17:18Z</updated>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3072:_Stargazing_4&amp;diff=371502</id>
		<title>3072: Stargazing 4</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3072:_Stargazing_4&amp;diff=371502"/>
				<updated>2025-04-05T18:08:20Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.126.5: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 3072&lt;br /&gt;
| date      = April 4, 2025&lt;br /&gt;
| title     = Stargazing 4&lt;br /&gt;
| image     = stargazing_4_2x.png&lt;br /&gt;
| imagesize = 740x386px&lt;br /&gt;
| noexpand  = true&lt;br /&gt;
| titletext = We haven't actually seen a star fall in since we invented telescopes, but I have a list of ones I'm really hoping are next.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
{{incomplete|Created by a BAD YELP REVIEW. Do NOT delete this tag too soon.}}&lt;br /&gt;
This is the fourth comic in the [[:Category:Stargazing|Stargazing]] series, and it followed [[2274: Stargazing 3]] that came out five years before. That was the longest stretch between two comics in the series so far.&lt;br /&gt;
&lt;br /&gt;
The host [[Megan]] begins the introduction by referencing rude {{w|Yelp}} reviews of her stargazing lessons. The reviewers doubt that she is actually a qualified astronomer due to how simplistic her lessons are, and that she is actually just saying the words that come to mind.&lt;br /&gt;
&lt;br /&gt;
Then she states that there are over 20 stars in the sky and some of them are over the age of 100. While each of these statements are true, it is an extreme underestimation of both their number and typical age, which respectively number in the thousands (for visible stars alone, so long as light pollution, [[1556: The Sky|daylight or clouds]] interfere) and typically billions or millions of years. Though in a city there could be less than 20 stars visible even in a clear night; in a normal stargazing session the event should though be moved to a place with as little light pollution as possible. Although, given the unprofessional nature of Megan's lessons, there is no guarantee that it does not take place in a city.&lt;br /&gt;
&lt;br /&gt;
Megan continues to state true facts that are of no value. She states that our galaxy is huge and that there are more grains of sand in the {{w|Milky Way}} than grains of sand on all of Earth's beaches. Since the Earth's sand is a subset of all of the galaxy's sand, and there are more planets with sand other than Earth (such as Mars), there are unquestionably more grains of sand in the entirety of the Milky Way than on Earth. This is a parody of the common saying that there are more stars in the visible universe than grains of sand on all the beaches of Earth. Tangentially it is actually unclear as to whether the stars outnumber Earth's sands, as shown here: [https://www.scientificamerican.com/article/do-stars-outnumber-the-sands-of-earths-beaches/ Do Stars Outnumber the Sands of Earth’s Beaches?] and here: [https://www.astronomy.com/science/the-ever-lasting-question-more-sand-or-stars/ The ever-lasting question: more sand or stars?]. The original quote was also all the sand on Earth, not just on the beaches.&lt;br /&gt;
&lt;br /&gt;
Megan also adds a helpful hint to those that do not know what a beach is, calling a beach a big wet sandbox. &lt;br /&gt;
&lt;br /&gt;
She then finishes the lesson by correctly saying that there is a black hole in the center of our galaxy ({{w|Sagittarius A*}}), and that stars sometimes fall in and get consumed by the black hole. When stars come too close to black holes, they experience a {{w|tidal disruption event}} (TDE), where a star is pulled apart by the black hole after exceeding its {{w|Roche limit}}. This creates streams of material that orbits the black hole and forms an accretion disk, that will eventually be consumed by the black hole or ejected in jets.&lt;br /&gt;
&lt;br /&gt;
She adds her personal opinion on this fact saying that such events are &amp;quot;hilarious&amp;quot; and proceeds by saying that it's okay to laugh at the fate of those stars as the gravity of the black hole will prevent any signals from those stars escaping. This is due to black holes' immense gravitational attraction that prevents even light from escaping. In Megan's case the most important consequence of this fact is that anyone on planets around such stars cannot leave Yelp reviews if they hear her laughing. Thus, they cannot add to those that mock her lesson.&lt;br /&gt;
&lt;br /&gt;
However, as the Roche limit of a black hole is always greater than its {{w|Schwarzschild radius}}, reviews made just after the star begins spaghettification could still escape the black hole. Not only do stars not use any kind of human-made technology,{{citation needed}} but any information regarding the app Yelp has yet to reach any star near Sagittarius A*, and will only reach it in 27 thousand years. It is much more likely that someone living on one of the star's planets would try to leave a comment on Yelp, not the star itself. But the same issues with distances would of course apply. It also seems unlikely that any planet would still be following a star when it first gets that close to a super massive black hole.&lt;br /&gt;
&lt;br /&gt;
In the title text Megan claims that we haven't actually seen a star fall into a black hole (or ''the'' black hole that she is describing) since we invented telescopes. In reality, over a hundred TDEs have been discovered in a variety of wavelengths, including by the Hubble telescope. The way title text is phrased though she might have meant fall into specifically Sagittarius A*, and while it is true that we haven't observed any star fall in into our closest supermassive black hole, the {{w|Sagittarius_A*#Discovery_of_G2_gas_cloud_on_an_accretion_course|G2 gas cloud on an accretion course}} was discovered in 2002. Megan also apparently has a list of stars she would like to see fall into the black hole. But she can keep hoping as humans at this time have no way of changing the orbit of any star. So unless she is hoping for one (or more) of the closer stars to fall in next, she is unlikely to experience success based on her list.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
{{incomplete transcript|Do NOT delete this tag too soon.}}&lt;br /&gt;
:[The background is black, Megan is in front of three others, Cueball and Ponytail to the left, and White Hat to the right. Megan is drawn in white while the background characters are in grey.]&lt;br /&gt;
:Megan: Welcome back to Stargazing.&lt;br /&gt;
:Megan: According to some ''incredibly'' rude Yelp reviews, I'm &amp;quot;not informative&amp;quot; and &amp;quot;can't possibly be an astronomer&amp;quot; and &amp;quot;just kind of say words as they occur to me.&amp;quot;&lt;br /&gt;
:Megan: I guess some losers just hate cool space facts!&lt;br /&gt;
&lt;br /&gt;
:[The sky is white, the floor is black, Megan is pointing at the sky. Hairy, a Megan-like girl (possibly Danish), Cueball, and Ponytail are on the left, White Hat and Hairbun are on the right. All of the characters are drawn in black.]&lt;br /&gt;
:Megan: Anyway, that dot is a &amp;quot;star.&amp;quot;&lt;br /&gt;
:Megan: There are over 20 stars in the sky, and some of them are more than 100 years old.&lt;br /&gt;
&lt;br /&gt;
:[The background is black again, the panel zooms in on Megan's face.]&lt;br /&gt;
:Megan: Our galaxy is huge.&lt;br /&gt;
:Megan: You know the beach? That big wet sandbox?&lt;br /&gt;
:Megan: Well, there are more grains of sand in the Milky Way than in all Earth's beaches combined.&lt;br /&gt;
:Off-panel voice to the left: Wow.&lt;br /&gt;
:Off-panel voice to the right: ...Wait.&lt;br /&gt;
&lt;br /&gt;
:[The background is still in black, Megan is in front of others and has her finger raised, Ponytail is left of Megan, White Hat and Hairbun on the right. Megan is again drawn in white while the background characters are in grey.]&lt;br /&gt;
:Megan: The galaxy has a black hole at the center.&lt;br /&gt;
:Megan: Sometimes stars fall in, which is ''hilarious''.&lt;br /&gt;
:Megan: Don't worry, it's okay to laugh. The gravity prevents signals from escaping, so they can't leave Yelp reviews.&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Stargazing]]&lt;br /&gt;
[[Category:Comics sharing name|Stargazing]]&lt;br /&gt;
[[Category:Comics with inverted brightness]]&lt;br /&gt;
[[Category:Astronomy]]&lt;br /&gt;
[[Category:Comics featuring Megan]]&lt;br /&gt;
[[Category:Comics featuring Cueball]]&lt;br /&gt;
[[Category:Comics featuring Ponytail]]&lt;br /&gt;
[[Category:Comics featuring White Hat]]&lt;br /&gt;
[[Category:Comics featuring Danish]]&lt;br /&gt;
[[Category:Comics featuring Hairy]]&lt;br /&gt;
[[Category:Comics featuring Hairbun]]&lt;/div&gt;</summary>
		<author><name>162.158.126.5</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=928:_Mimic_Octopus&amp;diff=369368</id>
		<title>928: Mimic Octopus</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=928:_Mimic_Octopus&amp;diff=369368"/>
				<updated>2025-03-18T16:21:27Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.126.5: /* Transcript */&lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;{{comic&lt;br /&gt;
| number    = 928&lt;br /&gt;
| date      = July 22, 2011&lt;br /&gt;
| title     = Mimic Octopus&lt;br /&gt;
| image     = mimic_octopus.png&lt;br /&gt;
| titletext = Even if the dictionaries are starting to give in, I refuse to accept 'octopi' as a word mainly because--I'm not making this up--there's a really satisfying climactic scene in the Orson Scott Card horror novel 'Lost Boys' which hinges on it being an incorrect pluralization.&lt;br /&gt;
}}&lt;br /&gt;
&lt;br /&gt;
==Explanation==&lt;br /&gt;
This comic is a parody of fish and sea-life identification charts, referencing the {{w|mimic octopus}} which, as the name implies, is able to mimic other animals, so all animals and objects found in the sea could actually just be such an animal (or animals).&lt;br /&gt;
&lt;br /&gt;
The identification chart for South East Asian sea life shows 13 creatures mimicked including eight individual fish (two of which are not yet recognized) and other objects and animals. In order, top-to-bottom, left-to-right: A {{w|Moorish idol}}, unknown, a {{w|rockfish}}, a {{w|clownfish}}, unknown, a {{w|lionfish}}, a {{w|shark}}, a {{w|crinoid|sea lily}}, an {{w|angler fish}}, an {{w|anchor}}, a {{w|submarine}}, a {{w|scuba diver}} and {{w|Shoaling and schooling|school of 11 fish}}. Finally there is an {{w|octopus}}, but rather than being the mimic octopus in its natural form it's actually two of them each (presumably) mimicking part of an octopus.&lt;br /&gt;
&lt;br /&gt;
The {{w|Orson Scott Card}} novel that the title text refers to is ''{{w|Lost Boys (novel)|Lost Boys}}'': &amp;quot;A withdrawn eight-year-old in a troubled family invents imaginary friends who bear the names of missing children&amp;quot; (Publisher's Weekly). The part of the story that [[Randall]] is referring to (Chapter 7, Crickets) involves a situation where the protagonist, Stevie, is given a C grade for an otherwise impeccable diorama featuring underwater animals involving clay sculptures (when only a poster would have sufficed) and a well-written presentation supposedly because the other children had destroyed the diorama before the end of the day. To make matters worse, his teacher, Ms. Jones, had made fun of his project and given the ribbon for first prize to someone else. &lt;br /&gt;
&lt;br /&gt;
On inquiring about the grading, his father, Step, found out that the principal, Dr. Mariner, had already made the decision to hand Stevie the blue ribbon for first prize as she had reviewed the project before it had been destroyed, but Ms. Jones had secretly overruled her behind her back by announcing that another child (JJ) would receive the ribbon. So, the next day he met up with Ms Jones after school to have a word on the grading of his project. Needless to say, they ended up arguing about minor issues, with Mrs. Jones justifying the reason for her decision on, among other things, the definition of a 'depiction', whether or not the amount of content was defined by the word count or the number of pages and of the importance of putting the report in a plastic cover. The argument finally comes to a head when Step points out that there was only one red mark on the project report, and that concerned an 'incorrect' pluralization of the word 'octopus' &lt;br /&gt;
&lt;br /&gt;
:“But Mrs. Jones, surely you know that the plural of “octopus” is either ‘octopus’, with nothing added, or ‘octopuses’.”&lt;br /&gt;
:“I think not,” said Mrs. Jones.&lt;br /&gt;
:“Think again, Mrs. Jones.”&lt;br /&gt;
:She must have realized that she was not on firm ground here. “Perhaps ‘octopuses’ is an alternate plural, but I’m sure that ‘octopi’ is the preferred.”&lt;br /&gt;
:“No, Mrs. Jones. If you had looked it up, you would have discovered that ‘octopi’ is not the preferred spelling. It is not a spelling at all. '''The word does not exist, except in the mouths of those who are pretending to be educated but in fact are not.''' This is because the ‘us’ ending of ‘octopus’ is not a Latin nominative singular ending, which would form its plural by changing to the letter ‘i’. Instead, the syllable ‘pus’ in ‘octopus’ is the Greek word for ‘foot.’ And it forms its plural the Greek way. Therefore ‘octopoda’, not ‘octopi’. Never ‘octopi’.”&lt;br /&gt;
:“Well, then, octopoda. Your son’s paper said octopuses.”&lt;br /&gt;
:“I know,” said Step. “When he asked me the correct plural, I told him octopoda. But then he was still uncertain, because my son doesn’t think he knows something until he knows it, and so he looked it up. And to my surprise, octopoda is only used when referring to more than one species of octopus, rather than when referring to more than one actual octopus. What Stevie put in his paper is in fact the preferred dictionary usage. Which you would have known, too, if you had looked it up.”&lt;br /&gt;
&lt;br /&gt;
After proving his case that his son did indeed deserve an A grade, he then threatened to bring the matter to the attention of the principal. He then warned Mrs. Jones that while he wanted the grade to remain unchanged, he wanted her to inform the class that the ribbon would be awarded to Stevie, before revealing that he had been recording the conversation all along. And, after this, after Mrs. Jones came crying for forgiveness before leaving, Step realized how vulnerable she was and how she was channeling her frustration at one particular student in each class to find some relief from that.&lt;br /&gt;
&lt;br /&gt;
According to the [http://www.youtube.com/watch?v=wFyY2mK8pxk Merriam-Webster Dictionary], 'octopi', 'octopuses', and 'octopodes' are all correct plural versions of &amp;quot;octopus.&amp;quot; However, &amp;quot;octopi&amp;quot; is etymologically incorrect as &amp;quot;octopus&amp;quot; is of Greek origin, rather than Latin. Following the Greek, the correct plural is 'octopodes'. Supposedly, Randall would very much like the word 'octopi' to remain unrecognized by major dictionaries as otherwise it would lessen the magnitude of the climactic conclusion of this argument by rendering Step's mockery of Ms. Jones' perceived intellectual superiority factually invalid. This also offers another reason why the octopus in the chart is named ''two mimic octopuses'', so Randall can use the correct pluralization of the word in the comic. This is an example of a comic where the title text seems more important to Randall than the actual comic.&lt;br /&gt;
&lt;br /&gt;
It should be noted that, at least according to [http://www.etymonline.com/index.php?term=octopus Etymology Dictionary], &amp;quot;octopi&amp;quot; is wrong for exactly the reasons that Step lists and first appears over 60 years later.&lt;br /&gt;
&lt;br /&gt;
==Transcript==&lt;br /&gt;
:[Captions above the panel:]&lt;br /&gt;
:&amp;lt;big&amp;gt;Southeast Asian Sea Life&amp;lt;/big&amp;gt;&lt;br /&gt;
:Identification Chart&lt;br /&gt;
:[The chart consist of 14 black silhouettes which includes eight individual fish and several other object/animals. From top left: A Moorish idol, unknown fish, a rockfish, a clownfish, unknown fish, a lionfish, a shark, a sea lily, an angler fish, an anchor with chain, a submarine, a scuba diver, a school of seven large and four small fish, and and at the bottom right a silhouette of an octopus displaying eight arms and a tilted head with large white eyes. All 14 are labeled the same except the octopus:]&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Mimic Octopus&lt;br /&gt;
:Two Mimic Octopuses&lt;br /&gt;
&lt;br /&gt;
{{comic discussion}}&lt;br /&gt;
&lt;br /&gt;
[[Category:Charts]]&lt;br /&gt;
[[Category:Biology]]&lt;br /&gt;
[[Category:Animals]]&lt;br /&gt;
[[Category:Sharks]]&lt;/div&gt;</summary>
		<author><name>162.158.126.5</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:3063:_Planet_Definitions&amp;diff=368888</id>
		<title>Talk:3063: Planet Definitions</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=Talk:3063:_Planet_Definitions&amp;diff=368888"/>
				<updated>2025-03-14T15:59:26Z</updated>
		
		<summary type="html">&lt;p&gt;162.158.126.5: &lt;/p&gt;
&lt;hr /&gt;
&lt;div&gt;&amp;lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&amp;gt;&lt;br /&gt;
The one currently posted has Pluto highlighted in the second box and not highlighted in the first box. Too hard to tell if it's trolling or a genuine mistake. :-D [[Special:Contributions/162.158.126.5|162.158.126.5]] 15:59, 14 March 2025 (UTC)&lt;br /&gt;
&lt;br /&gt;
And the first one also has a moon hilighted instead I think?? [[Special:Contributions/162.158.126.5|162.158.126.5]] 15:59, 14 March 2025 (UTC)&lt;/div&gt;</summary>
		<author><name>162.158.126.5</name></author>	</entry>

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