- Thank you received: 0
Do Away With Dark Energy Using Space Dusts
- tvanflandern
- Offline
- Platinum Member
Less
More
19 years 7 months ago #13404
by tvanflandern
Replied by tvanflandern on topic Reply from Tom Van Flandern
<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Larry Burford</i>
<br />what do they really mean when they say there is a "halo" of dark matter around a galaxy?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">The observed rotation speeds require that the invisible dark matter have a mass M proportional to its distance R from the galaxy's center. Then the force law changes from GM/R^2 to GM/R, where M is the visible mass. -|Tom|-
<br />what do they really mean when they say there is a "halo" of dark matter around a galaxy?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">The observed rotation speeds require that the invisible dark matter have a mass M proportional to its distance R from the galaxy's center. Then the force law changes from GM/R^2 to GM/R, where M is the visible mass. -|Tom|-
Please Log in or Create an account to join the conversation.
- Larry Burford
- Offline
- Platinum Member
Less
More
- Thank you received: 0
19 years 7 months ago #13178
by Larry Burford
When I first read this, I mis-read it as "inversely proportional" to R. And of course it didn't make sense.
Holy sh*t.
It's not so much that there is a halo of dark matter around each galaxy. It's more like each galaxy is centered inside of a small void within an otherwise universal atmosphere of dark matter.
Just about the exact inverse of the elysium ocean of MM.
===
Now I understand why they claim this means that 96% or more of the mass of the universe is dark matter.
But I still don't understand why any grown up would believe it. What is it about galaxies that repels dark matter?
LB
Replied by Larry Burford on topic Reply from Larry Burford
When I first read this, I mis-read it as "inversely proportional" to R. And of course it didn't make sense.
Holy sh*t.
It's not so much that there is a halo of dark matter around each galaxy. It's more like each galaxy is centered inside of a small void within an otherwise universal atmosphere of dark matter.
Just about the exact inverse of the elysium ocean of MM.
===
Now I understand why they claim this means that 96% or more of the mass of the universe is dark matter.
But I still don't understand why any grown up would believe it. What is it about galaxies that repels dark matter?
LB
Please Log in or Create an account to join the conversation.
Time to create page: 0.217 seconds