1723: Meteorite Identification - Revision history

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2026-03-31T17:00:14Z

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2600:4041:351:4800:6D73:5818:5352:D0 at 05:32, 9 November 2025

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Xuanlrrasj: He made another two box flowchart in 3165:_Earthquake_Prediction_Flowchart

2025-11-09T04:16:41Z

He made another two box flowchart in 3165:_Earthquake_Prediction_Flowchart

FaviFake at 22:07, 25 April 2025

2025-04-25T22:07:29Z

172.71.150.139: corrected assertion of where the comic click goes nowadays

2025-03-07T17:55:48Z

corrected assertion of where the comic click goes nowadays

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2022-06-01T19:24:39Z

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← Older revision		Revision as of 17:00, 31 March 2026
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	[[Category:Flowcharts]]		[[Category:Flowcharts]]
	[[Category:Astronomy]]		[[Category:Astronomy]]
		+	[[Category:Comics with custom header texts]]

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 Second, meteors that can be seen falling almost definitely cannot be found on the ground immediately after.  Any meteor big enough to glow and be visible while falling all the way to the ground will leave a large impact crater, rather than simply sit on the ground as a rock.  Smaller meteors do not fall fast enough to glow all the way to the ground. Either they will burn up completely (not leaving any meteorite) or they will be slowed down before they burn all the way up (but typically end up much smaller than the original meteoroid). After that they will stop glowing and will brake even further until they reach a {{w|terminal velocity}} due to air resistance. Their small size, and lack of glow, make them practically impossible to follow with the naked eye even in daylight. If a person stands close by the impact location of a meteor it may be possible to hear a swish and a thunk, from when it passes by and then hit the ground. It will then be possible to locate the meteorite, but such a falling stone could also have been dropped from an airplane or by a storm. But in some few cases people have actually heard a real meteor falling and found it afterwards. This is what happened with the 690 events mentioned above. All this is described on [http://www.meteoritemarket.com/metid2.htm How to Identify a Meteorite] from [http://www.meteoritemarket.com/ The Meteorite Market] which is linked in point 48 in the table from Washington University. But they did not see it fall!
-What Randall finds so funny about this part of the flowchart is that there are three arrows leading to the question "Did someone see it fall?", but from there only a "Yes" option is possible, and then this gives the result "Not a meteorite." This indicates that if you have found a rock that has no dark crust or [http://meteorites.wustl.edu/id/regmaglypts.htm regmaglypts] (the options that by saying no takes the user to the question about seeing it fall), then it is not a meteorite, and then the only reason people might still believe it to be a meteorite must be because someone saw it fall and assumed it came from space (rather than more likely scenarios, such as a stone coming loose from a cliff or building, or being dropped by a bird or aircraft).
+What Randall finds so funny about this part of the flowchart is that there are three arrows leading to the question "Did someone see it fall?", but from there only a "Yes" option is possible, and then this gives the result "Not a meteorite." This indicates that if you have found a rock that has no dark crust or [https://sites.wustl.edu/meteoritesite/items/regmaglypts/ regmaglypts] (the options that by saying no takes the user to the question about seeing it fall), then it is not a meteorite, and then the only reason people might still believe it to be a meteorite must be because someone saw it fall and assumed it came from space (rather than more likely scenarios, such as a stone coming loose from a cliff or building, or being dropped by a bird or aircraft).
 If the rock actually has those thumbprint like impressions on the surface (that scientists call {{w|Glossary of meteoritics#Regmaglypts|regmaglypts}}) then the creator of the flowchart actually asks to see the rock (photo or sample). The other features that are interesting is if it has a dark thin crust (from the melting during entry), but only if it also has either regmaglypts or if it has a lighter color inside than the outer crust.

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 The {{w|flowchart}}, though facetious, would actually work the vast majority of the time a person picks up a rock and believes it to be a meteorite, since any single rock one finds on the surface of the earth is almost definitely not a meteorite.
-Flowcharts are often used ([[:Category:Flowcharts|in xkcd]]) to give the inexperienced a step-by-step process to follow (see a guide to flowcharts here: [[518: Flow Charts]]). Meteorite identification, however, is very difficult, so the brevity of this flowchart in a way pokes fun at the need for a flowchart to identify meteorites, since laypeople are not experienced enough to confirm that a rock is indeed a meteorite. A similar short flowchart as this has been used recently in [[1691: Optimization]], and another only two box chart was used in [[1195: Flowchart]].
+Flowcharts are often used ([[:Category:Flowcharts|in xkcd]]) to give the inexperienced a step-by-step process to follow (see a guide to flowcharts here: [[518: Flow Charts]]). Meteorite identification, however, is very difficult, so the brevity of this flowchart in a way pokes fun at the need for a flowchart to identify meteorites, since laypeople are not experienced enough to confirm that a rock is indeed a meteorite. A similar short flowchart as this has been used recently in [[1691: Optimization]], and another two box chart was used in [[1195: Flowchart]] and [[3165: Earthquake Prediction Flowchart]].
 In the title text [[Randall]] mentions that the comic image is a link to the more detailed  (now defunct, mirror [http://imgur.com/a/RNYQ7 here]) ''[http://meteorites.wustl.edu/check-list.htm Meteorite or meteorwrong? Self-Test Check list]'' flowchart at the [http://eps.wustl.edu/ Department of Earth and Planetary Sciences] at {{w|Washington University in St. Louis}}.

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 }}
-'''Note:''' Clicking on the image on xkcd (click the date above the comic to go to the comic on xkcd) used to take you to the (now defunct, mirror [http://imgur.com/a/RNYQ7 here]) ''[http://meteorites.wustl.edu/check-list.htm Meteorite or meteorwrong? Self-Test Check list]'' flow chart at the [https://sites.wustl.edu/meteoritesite/ Department of Earth and Planetary Sciences] at {{w|Washington University in St. Louis}}. The link now points to the chart at https://sites.wustl.edu/meteoritesite/items/self-test-check-list/
+Clicking on the image on [https://xkcd.com xkcd.com] used to take the user to the (now defunct, mirror [http://imgur.com/a/RNYQ7 here]) ''[http://meteorites.wustl.edu/check-list.htm Meteorite or meteorwrong? Self-Test Check list]'' flow chart at the [https://sites.wustl.edu/meteoritesite/ Department of Earth and Planetary Sciences] at {{w|Washington University in St. Louis}}. The link now points to the chart at https://sites.wustl.edu/meteoritesite/items/self-test-check-list/
 ==Explanation==

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 }}
-'''Note:''' Clicking on the image on xkcd (click the date above the comic to go to the comic on xkcd) takes you to the (now defunct, mirror [http://imgur.com/a/RNYQ7 here]) ''[http://meteorites.wustl.edu/check-list.htm Meteorite or meteorwrong? Self-Test Check list]'' flow chart at the [https://sites.wustl.edu/meteoritesite/ Department of Earth and Planetary Sciences] at {{w|Washington University in St. Louis}}. The chart is now at https://sites.wustl.edu/meteoritesite/items/self-test-check-list/
+'''Note:''' Clicking on the image on xkcd (click the date above the comic to go to the comic on xkcd) used to take you to the (now defunct, mirror [http://imgur.com/a/RNYQ7 here]) ''[http://meteorites.wustl.edu/check-list.htm Meteorite or meteorwrong? Self-Test Check list]'' flow chart at the [https://sites.wustl.edu/meteoritesite/ Department of Earth and Planetary Sciences] at {{w|Washington University in St. Louis}}. The link now points to the chart at https://sites.wustl.edu/meteoritesite/items/self-test-check-list/
 ==Explanation==

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 | number    = 1723
 | date      = August 22, 2016
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+| title     = Meteorite Identification
 | image     = meteorite_identification.png
 | titletext = Click for an actual flowchart for identifying a meteorite. My favorite part is how 'Did someone see it fall? -> Yes' points to 'NOT A METEORITE.' This is not a mistake.