Talk:2186: Dark Matter - Revision history

NiceGuy1 at 04:29, 15 August 2019

2019-08-15T04:29:52Z

NiceGuy1 at 04:18, 15 August 2019

2019-08-15T04:18:15Z

Probably not Douglas Hofstadter: Added a comment.

2019-08-11T05:17:35Z

Added a comment.

172.68.141.148: ordinary matter

2019-08-10T02:09:44Z

ordinary matter

172.68.141.184: replies

2019-08-10T01:01:51Z

replies

141.101.105.246: request

2019-08-09T18:59:18Z

request

108.162.241.124 at 17:40, 9 August 2019

2019-08-09T17:40:06Z

Seebert at 11:47, 9 August 2019

2019-08-09T11:47:04Z

172.68.141.148: reply

2019-08-08T07:20:59Z

Lupo at 07:06, 8 August 2019

2019-08-08T07:06:59Z

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 :{{done}} [[Special:Contributions/172.69.22.32|172.69.22.32]] 01:25, 8 August 2019 (UTC)
 :You don't have bird feeders in Germany? I know birds exist all around the world, I would think people like to feed them all around the world... Or maybe you're missing squirrels that jump on them and make them spin? [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:18, 15 August 2019 (UTC)
 Anyone else who read PBH as PHB, the pointy haired boss from Dilbert? --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:06, 8 August 2019 (UTC)

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 I had to google what a spinning bird feeder is. I had never seen one of these before (I live in Germany). Maybe a link to one of these funny videos should be added. Frank [[Special:Contributions/172.68.110.64|172.68.110.64]] 19:59, 7 August 2019 (UTC)
 :{{done}} [[Special:Contributions/172.69.22.32|172.69.22.32]] 01:25, 8 August 2019 (UTC)
 Anyone else who read PBH as PHB, the pointy haired boss from Dilbert? --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:06, 8 August 2019 (UTC)

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 Anyone else who read PBH as PHB, the pointy haired boss from Dilbert? --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 07:06, 8 August 2019 (UTC)
 :I always think "peanut butter and ham," from PBJ+BLT I guess. [[Special:Contributions/172.68.141.148|172.68.141.148]] 07:20, 8 August 2019 (UTC)
 In the explanation, I think I missed a step of logic.  Are Windows, Icons, Mice and Pointers made up of Dark Matter?  It might explain a few lockups in Windows I've been having lately.[[User:Seebert|Seebert]] ([[User talk:Seebert|talk]]) 11:47, 9 August 2019 (UTC)

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 How can Megan use the dark matter density across the whole solar system to calculate the density within the Earth?  If dark matter interacts with gravity, shouldn't the distribution of dark matter within the Solar system be similar to the distribution of normal matter (i.e. much higher density near massive objects like the Earth)? [[Special:Contributions/108.162.241.124|108.162.241.124]] 17:40, 9 August 2019 (UTC)
-:It interacts with gravity, but in doing so it falls into and through ordinary mass and then just keeps going -- gravity isn't strong enough to slow it down enough to make it bunch up around normal matter. Only galaxies have discernible halos clumped. Most dark matter particles that fall into our solar system would just fall out the other side at the same speed, tossing them into the gravity of another star before they slow down enough to come back, in most cases. The linked density paper talks about the extent of that effect as the basis of their calculations. [[Special:Contributions/172.68.141.184|172.68.141.184]] 01:01, 10 August 2019 (UTC)
+:It interacts with gravity, but in doing so it falls into and through ordinary matter and then just keeps going -- gravity isn't strong enough to slow it down enough to make it bunch up around normal matter. Only galaxies have discernible halos clumped. Most dark matter particles that fall into our solar system would just fall out the other side at the same speed, tossing them into the gravity of another star before they slow down enough to come back, in most cases. The linked density paper talks about the extent of that effect as the basis of their calculations. [[Special:Contributions/172.68.141.184|172.68.141.184]] 01:01, 10 August 2019 (UTC)
 For comparison, it would be nice to have the average density of "regular" matter of the earth, the sun, interplanetary space, interstellar space, etc. --[[Special:Contributions/141.101.105.246|141.101.105.246]] 18:59, 9 August 2019 (UTC)
 :It's a little less than one fifth overall. However, you can't really have a local density of normal matter because it's clumped into stars and planets. Even at our scale, what's underneath is almost certainly far more dense than what's above you. [[Special:Contributions/172.68.141.184|172.68.141.184]] 01:01, 10 August 2019 (UTC)

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 How can Megan use the dark matter density across the whole solar system to calculate the density within the Earth?  If dark matter interacts with gravity, shouldn't the distribution of dark matter within the Solar system be similar to the distribution of normal matter (i.e. much higher density near massive objects like the Earth)? [[Special:Contributions/108.162.241.124|108.162.241.124]] 17:40, 9 August 2019 (UTC)
+:It interacts with gravity, but in doing so it falls into and through ordinary mass and then just keeps going -- gravity isn't strong enough to slow it down enough to make it bunch up around normal matter. Only galaxies have discernible halos clumped. Most dark matter particles that fall into our solar system would just fall out the other side at the same speed, tossing them into the gravity of another star before they slow down enough to come back, in most cases. The linked density paper talks about the extent of that effect as the basis of their calculations. [[Special:Contributions/172.68.141.184|172.68.141.184]] 01:01, 10 August 2019 (UTC)
 For comparison, it would be nice to have the average density of "regular" matter of the earth, the sun, interplanetary space, interstellar space, etc. --[[Special:Contributions/141.101.105.246|141.101.105.246]] 18:59, 9 August 2019 (UTC)

← Older revision		Revision as of 18:59, 9 August 2019
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	How can Megan use the dark matter density across the whole solar system to calculate the density within the Earth? If dark matter interacts with gravity, shouldn't the distribution of dark matter within the Solar system be similar to the distribution of normal matter (i.e. much higher density near massive objects like the Earth)? [[Special:Contributions/108.162.241.124\|108.162.241.124]] 17:40, 9 August 2019 (UTC)		How can Megan use the dark matter density across the whole solar system to calculate the density within the Earth? If dark matter interacts with gravity, shouldn't the distribution of dark matter within the Solar system be similar to the distribution of normal matter (i.e. much higher density near massive objects like the Earth)? [[Special:Contributions/108.162.241.124\|108.162.241.124]] 17:40, 9 August 2019 (UTC)
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		+	For comparison, it would be nice to have the average density of "regular" matter of the earth, the sun, interplanetary space, interstellar space, etc. --[[Special:Contributions/141.101.105.246\|141.101.105.246]] 18:59, 9 August 2019 (UTC)

← Older revision		Revision as of 17:40, 9 August 2019
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	In the explanation, I think I missed a step of logic. Are Windows, Icons, Mice and Pointers made up of Dark Matter? It might explain a few lockups in Windows I've been having lately.[[User:Seebert\|Seebert]] ([[User talk:Seebert\|talk]]) 11:47, 9 August 2019 (UTC)		In the explanation, I think I missed a step of logic. Are Windows, Icons, Mice and Pointers made up of Dark Matter? It might explain a few lockups in Windows I've been having lately.[[User:Seebert\|Seebert]] ([[User talk:Seebert\|talk]]) 11:47, 9 August 2019 (UTC)
		+
		+	How can Megan use the dark matter density across the whole solar system to calculate the density within the Earth? If dark matter interacts with gravity, shouldn't the distribution of dark matter within the Solar system be similar to the distribution of normal matter (i.e. much higher density near massive objects like the Earth)? [[Special:Contributions/108.162.241.124\|108.162.241.124]] 17:40, 9 August 2019 (UTC)

← Older revision		Revision as of 11:47, 9 August 2019
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	Anyone else who read PBH as PHB, the pointy haired boss from Dilbert? --[[User:Lupo\|Lupo]] ([[User talk:Lupo\|talk]]) 07:06, 8 August 2019 (UTC)		Anyone else who read PBH as PHB, the pointy haired boss from Dilbert? --[[User:Lupo\|Lupo]] ([[User talk:Lupo\|talk]]) 07:06, 8 August 2019 (UTC)
	:I always think "peanut butter and ham," from PBJ+BLT I guess. [[Special:Contributions/172.68.141.148\|172.68.141.148]] 07:20, 8 August 2019 (UTC)		:I always think "peanut butter and ham," from PBJ+BLT I guess. [[Special:Contributions/172.68.141.148\|172.68.141.148]] 07:20, 8 August 2019 (UTC)
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		+	In the explanation, I think I missed a step of logic. Are Windows, Icons, Mice and Pointers made up of Dark Matter? It might explain a few lockups in Windows I've been having lately.[[User:Seebert\|Seebert]] ([[User talk:Seebert\|talk]]) 11:47, 9 August 2019 (UTC)

← Older revision		Revision as of 07:20, 8 August 2019
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	Anyone else who read PBH as PHB, the pointy haired boss from Dilbert? --[[User:Lupo\|Lupo]] ([[User talk:Lupo\|talk]]) 07:06, 8 August 2019 (UTC)		Anyone else who read PBH as PHB, the pointy haired boss from Dilbert? --[[User:Lupo\|Lupo]] ([[User talk:Lupo\|talk]]) 07:06, 8 August 2019 (UTC)
		+	:I always think "peanut butter and ham," from PBJ+BLT I guess. [[Special:Contributions/172.68.141.148\|172.68.141.148]] 07:20, 8 August 2019 (UTC)

← Older revision		Revision as of 07:06, 8 August 2019
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	I had to google what a spinning bird feeder is. I had never seen one of these before (I live in Germany). Maybe a link to one of these funny videos should be added. Frank [[Special:Contributions/172.68.110.64\|172.68.110.64]] 19:59, 7 August 2019 (UTC)		I had to google what a spinning bird feeder is. I had never seen one of these before (I live in Germany). Maybe a link to one of these funny videos should be added. Frank [[Special:Contributions/172.68.110.64\|172.68.110.64]] 19:59, 7 August 2019 (UTC)
	:{{done}} [[Special:Contributions/172.69.22.32\|172.69.22.32]] 01:25, 8 August 2019 (UTC)		:{{done}} [[Special:Contributions/172.69.22.32\|172.69.22.32]] 01:25, 8 August 2019 (UTC)
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		+	Anyone else who read PBH as PHB, the pointy haired boss from Dilbert? --[[User:Lupo\|Lupo]] ([[User talk:Lupo\|talk]]) 07:06, 8 August 2019 (UTC)