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Do Away With Dark Energy Using Space Dusts
- rousejohnny
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19 years 6 months ago #13400
by rousejohnny
Reply from Johnny Rouse was created by rousejohnny
The 70% is deduced as a result of the energy necessary to generate cosmic expansion as a result of red shift. In order for it to be intergalactic dust, there would have to be an uneven distribution to generate the percieved movement. Some say we are not expanding at all, thus the issue of the energy source would be moot.
I could see this dust as a stretch being considered the source of dark matter, but not dark energy.
I could see this dust as a stretch being considered the source of dark matter, but not dark energy.
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- tvanflandern
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19 years 6 months ago #12599
by tvanflandern
Replied by tvanflandern on topic Reply from Tom Van Flandern
<i>Originally posted by Quantoken</i>
<br />Interstellar dust is easy to detect because it produces absorption lines in any light behind it. That's how we know that dust in space is extremely limited. -|Tom|-
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19 years 6 months ago #13401
by Quantoken
Replied by Quantoken on topic Reply from Quan Token
Tim said: "Interstellar dust is easy to detect because it produces absorption lines in any light behind it. That's how we know that dust in space is extremely limited"
But ONLY when it is highly concentrated, and exist in the form of plasma gas. The calculated cosmic dust accountable for the 70% mass of universe would be MUCH MUCH more diluted than the typically detected gas clouds, since it spreads throughout the whole space.
Further it exist not in the form of plasma, but in the form of small grains of milimeter size, that makes it much harder to detect. For example if there's smoke in the sky you can see it. But if I collect all the smoke particles and squeeze it into a tiny ping pong ball, you won't be able to see it from a few mile away.
It's very plausible that if heavy atoms like iron floats in the space, when they hit each other they tend to stick. That's because the background temperature is extremely low, 2.724K. Consider that as the reverse process of solid sublimation into free gas, albert at extremely low pressure. Meteorites falling into earth all the time is strong evidence such space micro meteorites can form.
Quantoken
But ONLY when it is highly concentrated, and exist in the form of plasma gas. The calculated cosmic dust accountable for the 70% mass of universe would be MUCH MUCH more diluted than the typically detected gas clouds, since it spreads throughout the whole space.
Further it exist not in the form of plasma, but in the form of small grains of milimeter size, that makes it much harder to detect. For example if there's smoke in the sky you can see it. But if I collect all the smoke particles and squeeze it into a tiny ping pong ball, you won't be able to see it from a few mile away.
It's very plausible that if heavy atoms like iron floats in the space, when they hit each other they tend to stick. That's because the background temperature is extremely low, 2.724K. Consider that as the reverse process of solid sublimation into free gas, albert at extremely low pressure. Meteorites falling into earth all the time is strong evidence such space micro meteorites can form.
Quantoken
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- tvanflandern
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19 years 6 months ago #13402
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 Quantoken</i>
<br />But ONLY when it is highly concentrated, and exist in the form of plasma gas.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">No, just the opposite. If the universe had enough dust to account for dark matter, no light from distant galaxies could reach us at all. The best way to hide matter is to collect it all into a single ball. The worst way is to expose every molecule separately. And the colder the dust, the more absorbent it is. -|Tom|-
<br />But ONLY when it is highly concentrated, and exist in the form of plasma gas.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">No, just the opposite. If the universe had enough dust to account for dark matter, no light from distant galaxies could reach us at all. The best way to hide matter is to collect it all into a single ball. The worst way is to expose every molecule separately. And the colder the dust, the more absorbent it is. -|Tom|-
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19 years 6 months ago #13403
by Jim
Replied by Jim on topic Reply from
Dust is rare outside galaxies or in the IGM but what about hydrogen? The form of hydrogen that is very hard to detect(I think its HII) is not included in the reasoning being presented here. HII could be quite common in the IGM(as far as I have been able to learn)and not be observed-is that right or not? And how much hydrogen would be needed to cause visual changes such as how air changes observations?
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- Larry Burford
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19 years 6 months ago #13206
by Larry Burford
Replied by Larry Burford on topic Reply from Larry Burford
Dr Van Flandern,
Dark matter is proposed as the solution to the "glactic rotation curve problem" (see drawings). Our solar system's orbital velocity is about 60 km/sec faster than expected (220 km/sec vs 160 km/sec) if the matter we can see is all there is and assuming 1/r^2 gravity.
According to the Dark Matter model, there is a halo of dark matter around a galaxy that is responsible for the difference between the expected and observed rotation curves for galaxies.
To me the word halo conjures up an image of a spherical shell, or perhaps a torus, of stuff (non baryonic dark matter is what they mostly call it) surrounding a galaxy. But we know from Physics 101 that the gravitational force field inside of a shell (or inside of a torus near its central plane) is zero.
The proposed rotation curve for this halo of DM (fig5) looks to me like the curve for a solid sphere.
So, what do they really mean when they say there is a "halo" of dark matter around a galaxy?
LB
Dark matter is proposed as the solution to the "glactic rotation curve problem" (see drawings). Our solar system's orbital velocity is about 60 km/sec faster than expected (220 km/sec vs 160 km/sec) if the matter we can see is all there is and assuming 1/r^2 gravity.
According to the Dark Matter model, there is a halo of dark matter around a galaxy that is responsible for the difference between the expected and observed rotation curves for galaxies.
To me the word halo conjures up an image of a spherical shell, or perhaps a torus, of stuff (non baryonic dark matter is what they mostly call it) surrounding a galaxy. But we know from Physics 101 that the gravitational force field inside of a shell (or inside of a torus near its central plane) is zero.
The proposed rotation curve for this halo of DM (fig5) looks to me like the curve for a solid sphere.
So, what do they really mean when they say there is a "halo" of dark matter around a galaxy?
LB
Code:
orbital speed
^
|x
| x
| x
| x
| x
| x
+---------------------------------> dist from center
fig1 Expected Rotation Curve for a solar system
fig2 Observed Rotation Curve for a solar system
orbital speed
^
| x
| x x
| x x
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|x x
+---------------------------------> dist from center
fig3 Expected Rotation Curve for a galaxy
orbital speed
^
| x
| x x
| x x x x
| x x
| x
|x
+---------------------------------> dist from center
fig4 Observed Rotation Curve for a galaxy
orbital speed
^
|
| x
| x x
| x x
| x
| x
| x
| x
| x
| x
| x
| x
| x
| x
|x
+---------------------------------> dist from center
fig5 Proposed Rotation Curve for a galaxy's DM halo
This curve, combined with the curve in fig3, produces the curve in fig4.
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