https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&user=Numberland&feedformat=atomexplain xkcd - User contributions [en]2024-03-29T06:24:16ZUser contributionsMediaWiki 1.30.0https://www.explainxkcd.com/wiki/index.php?title=2135:_M87_Black_Hole_Size_Comparison&diff=1726492135: M87 Black Hole Size Comparison2019-04-14T20:30:08Z<p>Numberland: /* Explanation */</p>
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<div>{{comic<br />
| number = 2135<br />
| date = April 10, 2019<br />
| title = M87 Black Hole Size Comparison<br />
| image = m87_black_hole_size_comparison.png<br />
| titletext = I think Voyager 1 would be just past the event horizon, but slightly less than halfway to the bright ring.<br />
}}<br />
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==Explanation==<br />
{{incomplete|Created by a REALLY REALLY BIG BLACK HOLE. Explanation needs to be expanded. Do NOT delete this tag too soon.}}<br />
This comic shows the picture of the {{w|Messier_87#Supermassive black hole|M87 black hole}} by the {{w|Event Horizon Telescope}} that was published on the same day as this comic. Overlaid on the picture is a scale image of the Solar System, showing the Sun, Pluto (one of the most well-known {{w|dwarf planet}}s), and {{w|Voyager 1}}, a deep-space probe and the current farthest probe from Earth. The comic is quite similar to [[1551: Pluto]], in which Randall overlaid annotations onto the recently-released first images of Pluto taken by the New Horizons spacecraft.<br />
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The point of the comic is to celebrate the release of this image by the Event Horizon Telescope, referenced two comics earlier, in [[2133: EHT Black Hole Picture]], as well as to indicate the hugeness of M87 and the awe-inspiring thing that space is. This image has been widely publicized as being the first image ever of a black hole. Science had no visual evidence of black holes at all [https://www.space.com/16411-black-hole-photo-nasa-telescope.html until 2012].<br />
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In the title text Randall hypothesizes that if the Sun were at the center of M87, Voyager would be outside the event horizon. This seems to fit with the EHT staff's estimates as published [https://eventhorizontelescope.org/ on their website], that the event horizon is 2.5 times smaller than the black shadow shown in the picture. However it means that Randall's scale is wrong - the solar system is actually about 40% of the size indicated in the comic.<br />
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==Transcript==<br />
{{incomplete transcript|Do NOT delete this tag too soon.}}<br />
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:Size comparison:<br />
:'''The M87 Black Hole'''<br />
:and<br />
:'''Our Solar System'''<br />
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:EHT Black Hole Image<br />
:Source: NSF<br />
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:[An image of the M87 black hole captured by the event horizon telescope on the day that this comic was published is shown. A white ring about 1/4 of the diameter of the central black portion of the image is labelled with an arrow as 'Pluto'. A small white circle at the centre of the image is labelled with an arrow as 'Sun'. A small white dot on the right hand edge of the central black portion of the image is labelled with an arrow as 'Voyager 1'.]<br />
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{{comic discussion}}<br />
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[[Category:Comics with color]]<br />
[[Category:Astronomy]]<br />
[[Category:Space]]</div>Numberlandhttps://www.explainxkcd.com/wiki/index.php?title=Talk:2135:_M87_Black_Hole_Size_Comparison&diff=172648Talk:2135: M87 Black Hole Size Comparison2019-04-14T20:28:19Z<p>Numberland: </p>
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<div><!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--><br />
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inb4 anti-semitic troll vandalizes the page [[Special:Contributions/162.158.78.64|162.158.78.64]] 19:38, 10 April 2019 (UTC)<br />
:Jeez, it hasn't happened yet? --[[User:Youforgotthisthing|Youforgotthisthing]] ([[User talk:Youforgotthisthing|talk]]) 19:54, 10 April 2019 (UTC)<br />
::Shhh! You'll jinx it! [[User:Herobrine|Herobrine]] ([[User talk:Herobrine|talk]]) 21:07, 10 April 2019 (UTC)<br />
::I’m surprised. [[User:Netherin5|“That Guy from the Netherlands”]] ([[User talk:Netherin5|talk]]) 23:06, 10 April 2019 (UTC)<br />
::I always miss it, you guys are too fast for me to see it. Not that I want to see it of course. [[User:Linker|Linker]] ([[User talk:Linker|talk]]) 12:08, 11 April 2019 (UTC)<br />
:Well, we made it until 15:40 on the 11th. Since it was created at 18:50 on the 10th, that's about... 20 hours and 15 minutes. Considering how it only took 13 minutes for #2133 to be vandalized-I-mean-corrected, and 25 minutes for #2125, it seems they're getting slower! I wonder if the poor lil fellas need more attention. :( --[[User:Youforgotthisthing|Youforgotthisthing]] ([[User talk:Youforgotthisthing|talk]]) 00:43, 12 April 2019 (UTC)<br />
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Am I the only to one who is amazed at just how *far* Voyager has come? [[Special:Contributions/162.158.111.61|162.158.111.61]] 19:52, 10 April 2019 (UTC)<br />
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I thought the dark disk on the photo is 2.6 Schwartzchild radii, not 1? --[[Special:Contributions/172.68.54.46|172.68.54.46]] 20:50, 10 April 2019 (UTC)<br />
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I Googled to get a sense of scale. Apparently the sun would be less than 4 miles across if compressed into a black hole. The magnitude is incomprehensible. [[Special:Contributions/172.69.210.64|172.69.210.64]] 02:54, 11 April 2019 (UTC)<br />
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I believe "Voyager I" in the title text is a typo and Randall meant to say Voyager II. The location Randall notes would correspond closer to Voyager II than I(9.3 billion miles away from earth vs 11 billion miles). [[Special:Contributions/172.69.247.4|172.69.247.4]] 06:21, 11 April 2019 (UTC)<br />
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I updated a few things in the explanation a couple hours back. It should read more smoothly now.<br />
[[User:Fmccarthy|Fmccarthy]] ([[User talk:Fmccarthy|talk]]) 08:01, 12 April 2019 (UTC)<br />
'''Rephrase scale reference'''<br />
2.5 times smaller is not a good way to express reduction in size. It's clearer to say that it's two-fifths as big or it's 40% of the size. [[Special:Contributions/162.158.38.16|162.158.38.16]] 09:58, 11 April 2019 (UTC)<br />
: It's what the official website says. [[User:Numberland|Numberland]] ([[User talk:Numberland|talk]]) 20:28, 14 April 2019 (UTC)<br />
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Is anyone agreeing with the source ? haven't found a clear attribution of the image to NSF; and also would be suprised to find one.<br />
: [https://www.nsf.gov/news/mmg/media/images/A-Consensus.jpg NSF link to image], [https://www.nsf.gov/news/news_images.jsp?cntn_id=298276&org=NSF NSF page with attribution], "The National Science Foundation (NSF) played a pivotal role in this discovery by funding individual investigators, interdisciplinary scientific teams and radio astronomy research facilities since the inception of EHT. Over the last two decades, NSF has directly funded more than $28 million in EHT research, the largest commitment of resources for the project." [https://www.nsf.gov/news/news_summ.jsp?cntn_id=298276 Source Article and NSF relation to EHT] --[[Special:Contributions/162.158.106.138|162.158.106.138]] 16:30, 11 April 2019 (UTC)Zenthere<br />
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This is alot like the Pluto comic from a few years back. [[User:Take The A Train To Watertown|Take The A Train To Watertown]] ([[User talk:Take The A Train To Watertown|talk]]) 12:10, 11 April 2019 (UTC)<br />
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Why is pluto bigger than the sun? [[User:Lekkin007|Lekkin007]] ([[User talk:Lekkin007|talk]])<br />
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:the circle is more likely to be pluto's _orbit_, in which there is a small break, in which there is a small dot, which is more likely to represent pluto. the arrow points to the dot. [[User:Ocæon|ocæon]] ([[User talk:Ocæon|talk]]) 23:03, 12 April 2019 (UTC)<br />
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I am trying to spread truth and good critical thinking, but IP editors keep reverting My well-intention edits! What can I do?<br />
[[Special:Contributions/162.158.107.79|162.158.107.79]] 16:59, 11 April 2019 (UTC)<br />
:See https://www.youtube.com/watch?v=zUyH3XhpLTo[[Special:Contributions/162.158.78.82|162.158.78.82]] 18:26, 11 April 2019 (UTC)<br />
:: HAVE YOU TRIED WALKING INTO THE SEA (can't find the relevant xkcd sorry) on a more serious note, I'd be for banning IP editors myself, it wouldn't matter much and just stop me from editing on mobile. If the comments section could somehow be left IP editable but not the articles, that would be an interesting Midway point, but any degree necessary is fine.{{unsigned|172.68.78.100}}<br />
:::Sign your posts you fucking cunt [[Special:Contributions/162.158.107.97|162.158.107.97]] 15:37, 12 April 2019 (UTC)<br />
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:::[[1912: Thermostat]] -- [[User:Hkmaly|Hkmaly]] ([[User talk:Hkmaly|talk]]) 22:24, 12 April 2019 (UTC)<br />
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Anyone else find it ironic for an IP editor to refer to logged-in editors as IP editors? That's the pot calling the brass teapot black! [[User:Ianrbibtitlht|Ianrbibtitlht]] ([[User talk:Ianrbibtitlht|talk]]) 06:09, 12 April 2019 (UTC)<br />
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As I understand the link "The black hole’s boundary — the event horizon from which the EHT takes its name — is around 2.5 times smaller than the shadow it casts and measures just under 40 billion km across." This is actually showing the wrong scale by a factor of 2.5 - voyager 1 is about at the event horizon, only 40% of the way out of the shadow. Going to edit this but wanted to add discussion here as well. [[User:Numberland|Numberland]] ([[User talk:Numberland|talk]]) 20:28, 14 April 2019 (UTC)</div>Numberland