Talk:2516: Hubble Tension - Revision history

172.70.126.211 at 17:55, 4 October 2021

2021-10-04T17:55:14Z

162.158.91.106 at 11:35, 20 September 2021

2021-09-20T11:35:45Z

Sandor at 10:34, 20 September 2021

2021-09-20T10:34:14Z

Sandor at 10:32, 20 September 2021

2021-09-20T10:32:16Z

172.70.126.195 at 09:10, 17 September 2021

2021-09-17T09:10:25Z

172.70.178.191 at 09:09, 17 September 2021

2021-09-17T09:09:18Z

Geek Prophet: Comment on Dave's radar gun results

2021-09-16T20:34:18Z

Comment on Dave's radar gun results

172.70.126.195 at 16:22, 16 September 2021

2021-09-16T16:22:58Z

Barmar at 14:20, 16 September 2021

2021-09-16T14:20:44Z

172.70.130.87 at 14:15, 16 September 2021

2021-09-16T14:15:39Z

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 Is the 85 mph number significant in any way?  Why does "Dave" who points radar guns in random directions get this number? [[Special:Contributions/108.162.245.167|108.162.245.167]] 03:41, 16 September 2021 (UTC)
 :Well, it's probably over the speed limit in most places. Maybe Dave is a traffic cop? --[[Special:Contributions/172.68.129.137|172.68.129.137]] 04:55, 16 September 2021 (UTC)
 Unfortunately, the explanation only explains the things everyone can read on the internet anyway. 85 mph or 85 km/h have the wrong unit, because for the expansion speed we need to look at two points of space, measure how fast they move away from each other. Obviously this should be a number that increases linearly with the distance of the two points (if space is created equally everywhere in the universe). Thus the 85 km/h misses the length. Is the joke here that a random dudes results are reported equally (false equivalence)? --[[Special:Contributions/162.158.93.142|162.158.93.142]] 04:41, 16 September 2021 (UTC)

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 With all this talk about units, I would like to mention that Google ever-so-helpfully says that 1 km/s/Mpc is "3.24077929e-20 hertz". [[Special:Contributions/172.70.126.195|172.70.126.195]] 16:22, 16 September 2021 (UTC)
-: Google also says 73 km/s/Mpc is 2.36576888e-18 hertz, which is perhaps unsurprisingly 1 over the age of the universe. [[User:Sandor|Sandor]] ([[User talk:Sandor|talk]]) 10:32, 20 September 2021 (UT
+: Google also says 68 km/s/Mpc is 2.20372992 × 10-18 hertz, which is perhaps unsurprisingly about one over the age of the universe, also known as the [https://en.wikipedia.org/wiki/Hubble%27s_law#Hubble_time "Hubble time"]. [[Special:Contributions/162.158.91.106|162.158.91.106]] 11:35, 20 September 2021 (UTC)
 I see two things to comment on about Dave's response. First, if everything measured always shows the same velocity, then the "per megaparsec" part of the result becomes largely irrelevant, as Dave's results are the same regardless of this value. This means that Dave's results are "it doesn't matter how far away, it is all 85 MPH!" If taken seriously, this would be a challenge to the standard model of an expanding universe much bigger than the actually existing controversy.

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 :In acceleration, the velocity increases over time. In expansion, the velocity increases over distance. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 14:20, 16 September 2021 (UTC)
-With all this talk about units, I would like to mention that Google ever-so-helpfully says that 1 km/s/Mpc is "3.24077929e-20 hertz".
+With all this talk about units, I would like to mention that Google ever-so-helpfully says that 1 km/s/Mpc is "3.24077929e-20 hertz". [[Special:Contributions/172.70.126.195|172.70.126.195]] 16:22, 16 September 2021 (UTC)
-: Google also says 73 km/s/Mpc is 2.36576888e-18 hertz, which is perhaps unsurprisingly 1 over the age of the universe. [[User:Sandor|Sandor]] ([[User talk:Sandor|talk]]) 10:32, 20 September 2021 (UTC)
+: Google also says 73 km/s/Mpc is 2.36576888e-18 hertz, which is perhaps unsurprisingly 1 over the age of the universe. [[User:Sandor|Sandor]] ([[User talk:Sandor|talk]]) 10:32, 20 September 2021 (UT
 I see two things to comment on about Dave's response. First, if everything measured always shows the same velocity, then the "per megaparsec" part of the result becomes largely irrelevant, as Dave's results are the same regardless of this value. This means that Dave's results are "it doesn't matter how far away, it is all 85 MPH!" If taken seriously, this would be a challenge to the standard model of an expanding universe much bigger than the actually existing controversy.

@@ Line 25: / Line 25: @@
 :In acceleration, the velocity increases over time. In expansion, the velocity increases over distance. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 14:20, 16 September 2021 (UTC)
-With all this talk about units, I would like to mention that Google ever-so-helpfully says that 1 km/s/Mpc is "3.24077929e-20 hertz". [[Special:Contributions/172.70.126.195|172.70.126.195]] 16:22, 16 September 2021 (UTC)
+With all this talk about units, I would like to mention that Google ever-so-helpfully says that 1 km/s/Mpc is "3.24077929e-20 hertz".
 I see two things to comment on about Dave's response. First, if everything measured always shows the same velocity, then the "per megaparsec" part of the result becomes largely irrelevant, as Dave's results are the same regardless of this value. This means that Dave's results are "it doesn't matter how far away, it is all 85 MPH!" If taken seriously, this would be a challenge to the standard model of an expanding universe much bigger than the actually existing controversy.

← Older revision		Revision as of 09:10, 17 September 2021
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	Second, I believe the joke here is that Dave's radar gun is a police model that consistently reports that anything being measured is speeding. A recurring accusation, and occasional actual problem that requires police radar units to be tested regularly to avoid, is that radar guns that report speeds higher than they actually are are used to issue tickets unfairly. When used as an accusation, or in fictional media, it sometimes comes with an accusation that this happens with the full knowledge of a cop who cares more about issuing tickets than doing his job properly. In this case it appears that either every Ford Galaxy, all traffic, or even possibly the sky itself, is consistently "speeding" in this fashion.[[User:Geek Prophet\|Geek Prophet]] ([[User talk:Geek Prophet\|talk]]) 20:34, 16 September 2021 (UTC)		Second, I believe the joke here is that Dave's radar gun is a police model that consistently reports that anything being measured is speeding. A recurring accusation, and occasional actual problem that requires police radar units to be tested regularly to avoid, is that radar guns that report speeds higher than they actually are are used to issue tickets unfairly. When used as an accusation, or in fictional media, it sometimes comes with an accusation that this happens with the full knowledge of a cop who cares more about issuing tickets than doing his job properly. In this case it appears that either every Ford Galaxy, all traffic, or even possibly the sky itself, is consistently "speeding" in this fashion.[[User:Geek Prophet\|Geek Prophet]] ([[User talk:Geek Prophet\|talk]]) 20:34, 16 September 2021 (UTC)

−	Dave's radar could have been pointed at a Galaxie: https://mystarcollectorcar.com/the-out-of-this-world-ford-galaxie1959-to-1974/ [[Special:Contributions/172.70.178.191\|172.70.178.191]] 09:09, 17 September 2021 (UTC)	+	Dave's radar could have been pointed at a Ford Galaxie: https://mystarcollectorcar.com/the-out-of-this-world-ford-galaxie1959-to-1974/ [[Special:Contributions/172.70.178.191\|172.70.178.191]] 09:09, 17 September 2021 (UTC)

← Older revision		Revision as of 09:09, 17 September 2021
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	Second, I believe the joke here is that Dave's radar gun is a police model that consistently reports that anything being measured is speeding. A recurring accusation, and occasional actual problem that requires police radar units to be tested regularly to avoid, is that radar guns that report speeds higher than they actually are are used to issue tickets unfairly. When used as an accusation, or in fictional media, it sometimes comes with an accusation that this happens with the full knowledge of a cop who cares more about issuing tickets than doing his job properly. In this case it appears that either every Ford Galaxy, all traffic, or even possibly the sky itself, is consistently "speeding" in this fashion.[[User:Geek Prophet\|Geek Prophet]] ([[User talk:Geek Prophet\|talk]]) 20:34, 16 September 2021 (UTC)		Second, I believe the joke here is that Dave's radar gun is a police model that consistently reports that anything being measured is speeding. A recurring accusation, and occasional actual problem that requires police radar units to be tested regularly to avoid, is that radar guns that report speeds higher than they actually are are used to issue tickets unfairly. When used as an accusation, or in fictional media, it sometimes comes with an accusation that this happens with the full knowledge of a cop who cares more about issuing tickets than doing his job properly. In this case it appears that either every Ford Galaxy, all traffic, or even possibly the sky itself, is consistently "speeding" in this fashion.[[User:Geek Prophet\|Geek Prophet]] ([[User talk:Geek Prophet\|talk]]) 20:34, 16 September 2021 (UTC)
		+
		+	Dave's radar could have been pointed at a Galaxie: https://mystarcollectorcar.com/the-out-of-this-world-ford-galaxie1959-to-1974/ [[Special:Contributions/172.70.178.191\|172.70.178.191]] 09:09, 17 September 2021 (UTC)

← Older revision		Revision as of 20:34, 16 September 2021
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	With all this talk about units, I would like to mention that Google ever-so-helpfully says that 1 km/s/Mpc is "3.24077929e-20 hertz". [[Special:Contributions/172.70.126.195\|172.70.126.195]] 16:22, 16 September 2021 (UTC)		With all this talk about units, I would like to mention that Google ever-so-helpfully says that 1 km/s/Mpc is "3.24077929e-20 hertz". [[Special:Contributions/172.70.126.195\|172.70.126.195]] 16:22, 16 September 2021 (UTC)
		+
		+	I see two things to comment on about Dave's response. First, if everything measured always shows the same velocity, then the "per megaparsec" part of the result becomes largely irrelevant, as Dave's results are the same regardless of this value. This means that Dave's results are "it doesn't matter how far away, it is all 85 MPH!" If taken seriously, this would be a challenge to the standard model of an expanding universe much bigger than the actually existing controversy.
		+
		+	Second, I believe the joke here is that Dave's radar gun is a police model that consistently reports that anything being measured is speeding. A recurring accusation, and occasional actual problem that requires police radar units to be tested regularly to avoid, is that radar guns that report speeds higher than they actually are are used to issue tickets unfairly. When used as an accusation, or in fictional media, it sometimes comes with an accusation that this happens with the full knowledge of a cop who cares more about issuing tickets than doing his job properly. In this case it appears that either every Ford Galaxy, all traffic, or even possibly the sky itself, is consistently "speeding" in this fashion.[[User:Geek Prophet\|Geek Prophet]] ([[User talk:Geek Prophet\|talk]]) 20:34, 16 September 2021 (UTC)

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	How is the expansion rate different from an acceleration? The (correct) units surprise me. [[Special:Contributions/172.70.130.87\|172.70.130.87]] 14:15, 16 September 2021 (UTC)		How is the expansion rate different from an acceleration? The (correct) units surprise me. [[Special:Contributions/172.70.130.87\|172.70.130.87]] 14:15, 16 September 2021 (UTC)
	:In acceleration, the velocity increases over time. In expansion, the velocity increases over distance. [[User:Barmar\|Barmar]] ([[User talk:Barmar\|talk]]) 14:20, 16 September 2021 (UTC)		:In acceleration, the velocity increases over time. In expansion, the velocity increases over distance. [[User:Barmar\|Barmar]] ([[User talk:Barmar\|talk]]) 14:20, 16 September 2021 (UTC)
		+
		+	With all this talk about units, I would like to mention that Google ever-so-helpfully says that 1 km/s/Mpc is "3.24077929e-20 hertz". [[Special:Contributions/172.70.126.195\|172.70.126.195]] 16:22, 16 September 2021 (UTC)

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	I think we've missed an important joke in the last panel. Dave says the galaxies are moving at 85mph/kph and "booking it". However, KM/S/Mpc is going to be on the scale of several thousand times faster than 85mph/kph. Dave's reference to "booking it" is actually moving quite slow. [[User:Pconwell\|Pconwell]] ([[User talk:Pconwell\|talk]]) 12:57, 16 September 2021 (UTC)		I think we've missed an important joke in the last panel. Dave says the galaxies are moving at 85mph/kph and "booking it". However, KM/S/Mpc is going to be on the scale of several thousand times faster than 85mph/kph. Dave's reference to "booking it" is actually moving quite slow. [[User:Pconwell\|Pconwell]] ([[User talk:Pconwell\|talk]]) 12:57, 16 September 2021 (UTC)
		+	:Dave is used to measuring car speeds, and 85 MPH is very fast (significantly over the speed limit) in most places. The joke is that he's totally out of context and measuring the wrong thing, but it happens to be a number in the same ballpark as the Hubble Constant. Of course, this is just a coincidence, since the units are different. [[User:Barmar\|Barmar]] ([[User talk:Barmar\|talk]]) 14:20, 16 September 2021 (UTC)

	How is the expansion rate different from an acceleration? The (correct) units surprise me. [[Special:Contributions/172.70.130.87\|172.70.130.87]] 14:15, 16 September 2021 (UTC)		How is the expansion rate different from an acceleration? The (correct) units surprise me. [[Special:Contributions/172.70.130.87\|172.70.130.87]] 14:15, 16 September 2021 (UTC)
		+	:In acceleration, the velocity increases over time. In expansion, the velocity increases over distance. [[User:Barmar\|Barmar]] ([[User talk:Barmar\|talk]]) 14:20, 16 September 2021 (UTC)

← Older revision		Revision as of 14:15, 16 September 2021
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	I think we've missed an important joke in the last panel. Dave says the galaxies are moving at 85mph/kph and "booking it". However, KM/S/Mpc is going to be on the scale of several thousand times faster than 85mph/kph. Dave's reference to "booking it" is actually moving quite slow. [[User:Pconwell\|Pconwell]] ([[User talk:Pconwell\|talk]]) 12:57, 16 September 2021 (UTC)		I think we've missed an important joke in the last panel. Dave says the galaxies are moving at 85mph/kph and "booking it". However, KM/S/Mpc is going to be on the scale of several thousand times faster than 85mph/kph. Dave's reference to "booking it" is actually moving quite slow. [[User:Pconwell\|Pconwell]] ([[User talk:Pconwell\|talk]]) 12:57, 16 September 2021 (UTC)
		+
		+	How is the expansion rate different from an acceleration? The (correct) units surprise me. [[Special:Contributions/172.70.130.87\|172.70.130.87]] 14:15, 16 September 2021 (UTC)