In astrophysics and cosmology, dark matter is matter, not directly observed and of unknown composition, that does not emit or reflect enough electromagnetic radiation to be detected directly, but whose presence can be inferred from gravitational effects on visible matter. According to the Standard Model, dark matter accounts for the vast majority of mass in the observable universe. Among the observed phenomena consistent with the hypothesis of dark matter are the rotational speeds of galaxies and orbital velocities of galaxies in clusters, gravitational lensing of background objects by galaxy clusters such as the Bullet cluster, and the temperature distribution of hot gas in galaxies and clusters of galaxies. Dark matter also plays a central role in structure formation and Big Bang nucleosynthesis, and has measurable effects on the anisotropy of the cosmic microwave background. All these lines of evidence suggest that galaxies, clusters of galaxies, and the universe as a whole contain far more matter than is directly observable, indicating that the remainder is dark.
The composition of dark matter is unknown, but may include new elementary particles such as WIMPs, axions, and ordinary and heavy neutrinos, as well as astronomical bodies such as dwarf stars, planets collectively called MACHOs, and clouds of nonluminous gas. Current evidence favors models in which the primary component of dark matter is new elementary particles, collectively called non-baryonic dark matter.
The dark matter component has vastly more mass than the "visible" component of the universe. At present, the density of ordinary baryons and radiation in the universe is estimated to be equivalent to about one hydrogen atom per cubic metre of space. Only about 4% of the total energy density in the universe (as inferred from gravitational effects) can be seen directly. About 22% is thought to be composed of dark matter. The remaining 74% is thought to consist of dark energy, an even stranger component, distributed diffusely in space. Some hard-to-detect baryonic matter makes a contribution to dark matter, but constitutes only a small portion. Determining the nature of this missing mass is one of the most important problems in modern cosmology and particle physics. It has been noted that the names "dark matter" and "dark energy" serve mainly as expressions of our ignorance, much as the marking of early maps with terra incognita.
In astrophysics, dark matter reffers to undetectable matter or particles whose presence explains unexpected gravitational effects on galaxies and stars. Various assumptions were made on the composition of dark matter :
Molecular gas,
dead stars,
Brown dwarf stars,
Black holes, etc
However, the observations (or rather lack of direct observations) would imply a non-baryonic nature (proton, neutro), and thus still unknown nature. According to galaxies formation and evolution models as well as cosmological models, dark matter would represent approximately 30% of the total mass of the Universe.
2007-02-11 17:57:50
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answer #1
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answered by razov 2
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The Quantum physics approves, that in the beginning God
created " virtual particles ".
Astrophysics approve, that in the beginning the God created
" latent mass ","invisible particles ", “'missing mass'” or “'dark matter'”.
From them the God created everything.
But nobody knows, what is " virtual particles ",“'dark matter'”
what is " latent mass ", " invisible particles ".
And then the physicists are surprised :
“Why is the nature of the microworld so paradoxical ?”
We use words not understanding their meaning.
Does any body remember how we call people
who say words and do not know their mining?
Who are we?
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Now it is consider, that reference frame connected with
relict isotropic radiation T = 2,7K is absolute.
But T = 2,7K is not a constant factor.
This relict isotropic radiation continues to extend and decrease
and, hence, approximately over a period of
20 billions years will reach T=0K.
That is a structure of Nothing, of Vacuum, of Absolute Zero.
2.
What a geometrical and physical parameters can the particles have in
the structure of Nothing, in Vacuum, in Absolute Zero in T=0K?
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According to the laws of physics :
J. Charles ( 1787), Gay-Lussac ( 1802),
W. Nernst ( 1910), A. Einstein ( 1925)
particles in a Vacuum cannot have density, volume
and consequently should be flat figures.
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These laws tell, that
then closer to zero T=0K, then the particles lose more their volume.
The volume of these particles aspire to infinity.
And then this “ infinity” comes the brain of physicists
stop to work. They refuse to think any more.
And I say when volume of the particles disappear they
become “flat phantoms”.
These “flat phantoms” are not abstract particles, they are real ones.
Quantums of light flies with speed c=1 have such geometrical form.
=========================
http://www.socratus.com
2007-02-11 21:21:43
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answer #2
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answered by socratus 2
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That's a good idea but I am not sure how far wind can go with no gravity. There are dust storms on planets however they don't create energy. It would be a good research project to determine the extent of wind as we know it in outer space. Solar flares send energy waves to earth and could cause wind as well.
2007-02-11 18:07:52
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answer #3
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answered by Anonymous
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are you talking about plasma?
do some research on plasma cosmology ...
dark just refers to stuff we cant detect but must be there.... thats all.
many plasma physicists think they have answers to these problems but being that the vast majority of mainstream astrophysicists are not educated in electrical currents and plasma physics they dont listen.. even though 99% of the known universe is the plasma state of matter..
check out : http://www.plasmacosmology.net/
you could call it "dark wind" for whatever "wind" we cannot detect.
2007-02-11 17:59:42
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answer #4
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answered by Anonymous
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count is what makes you me and surprisingly plenty each and every little thing else which could be considered touched or smelled darkish count is basically the call they provide to something that they have got no theory what that's, so they call it darkish count via fact it doesnt work together with regualr count in any respect, the only way all of us comprehend of that's via fact of its gravitational effects. style of like how all of us comprehend approximately black holes even however we cant see them yet we come across them via fact of their gravity. Antimatter is definitely comparable to count, basically the charges are reversed so if count and anti-count come into touch they injury one yet another, and anti count isn't imaginary, that's been created interior the laboratory so that's particularly genuine.
2016-11-03 05:23:17
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answer #5
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answered by mosesjr 4
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What is the question? Yes I know what dark matter is, it is the type of matter that most of the universe is made from and that we don't know much about. What is your point?
2007-02-11 17:47:13
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answer #6
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answered by Anonymous
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Dark matter is suppose to hold the the universe together in the ways, us mortals are not meant to know.Because if we did ,we would just wreck it. Look what's happening to the earth
2007-02-11 17:55:14
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answer #7
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answered by tuxedo cat 6
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SEE THE LINK
2007-02-11 17:46:56
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answer #8
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answered by maussy 7
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Sorry I could not get you, what you want to ask?
2007-02-11 18:48:15
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answer #9
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answered by Rajesh 3
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