Is dark matter real?

@nne
@nne
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RE: RE: RE: well

Message 38372 in response to message 38371

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well something obviously has to be there, to explaine all the weird fenomenon, what the dark matter exactly is , thats another question. I dont see a problem that we havent fount dark matter on earth or near it, if you live on inland and havent seen the ocean , it doesnt mean that it doesent exist.

i've heard that an interaction between dark matter and matter had been recently observed during a collision between two galaxies.

It was added that this dark matter could be of a different composition compared to the "usual" matter and that it could go through everything that goes in its way.

Have you heard about this and do you have any comment ?


There was this article (back in August): Cosmic collision reveals dark matter
Comments: seems quite conclusive (re: modified theories on gravity), and there should be more examples that show the same effect (separation of the dark matter from normal matter during galactic merger), but since it takes more than one instrument (ie, optical and x-ray instruments) to get the composite image, and then additional observations and calculations to determine where the gravitational lensing is occurring, I'm guessing we'll have to wait a while... effectively reducing the rest of my comments, at the moment, to an enthusiastic "Hmmm...." :)

Thank you, that's exactly the news I was talking about, except that I saw it on video. :)

All this is so exciting !!! :)))

John37309
John37309
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This dark matter thing is

This dark matter thing is rubbish!!
And dark energy also.

Its like trying to get people to believe in something that just is
not there. science has a lot to answer for, and a lot of catching
up to do!

Dark energy and dark matter are very poor names given to measurements in
science that some people have trouble explaining.

Chipper Q
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RE: Dark energy and dark

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Dark energy and dark matter are very poor names given to measurements in
science that some people have trouble explaining.


So what names do you use to explain the observed (measured) galaxy rotation curves, and what is the explanation?

gravitonring
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http://www.nasa.gov/home/hqne

Message 38375 in response to message 38374

http://www.nasa.gov/home/hqnews/2006/aug/HQ_06297_CHANDRA_Dark_Matter.html
NASA Finds Direct Proof of Dark Matter

i think the french fraze for dark matter is fait de complet

everything is true, the opposite of everything is also true

@nne
@nne
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RE: http://www.nasa.gov/hom

Message 38376 in response to message 38375

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http://www.nasa.gov/home/hqnews/2006/aug/HQ_06297_CHANDRA_Dark_Matter.html
NASA Finds Direct Proof of Dark Matter

i think the french fraze for dark matter is fait de complet

Sorry ?

Here "dark matter" is called "matière noire" (black matter). At least it was so some time ago. Now we tend to use the expression : matière manquante (missing matter). :)

@nne
@nne
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RE: RE: http://www.nasa.g

Message 38377 in response to message 38376

Quote:
Quote:

http://www.nasa.gov/home/hqnews/2006/aug/HQ_06297_CHANDRA_Dark_Matter.html
NASA Finds Direct Proof of Dark Matter

i think the french fraze for dark matter is fait de complet

Sorry ?

Here "dark matter" is called "matière noire" (black matter). At least it was so some time ago. Now we tend to use the expression : matière manquante (missing matter). :)

Sorry, I made it wrong ! :(

We refer to dark matter as "masse manquante" (missing mass)

Chipper Q
Chipper Q
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RE: We refer to dark matter

Quote:
We refer to dark matter as "masse manquante" (missing mass)


That characterization reminds me of the neutrino. Does anyone know what percentage of cosmological mass is attributed to all the neutrinos created (emitted?) during the big bang, and during the last ~14 billion years? Or is the neutrino mass already accounted for in the normal baryonic matter? What about all the neutrinos from all the reactions that led to the observed matter/antimatter asymmetry?

gravitonring
gravitonring
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ahhh but zee neutrino e non

Message 38379 in response to message 38378

ahhh but zee neutrino e non existant de:

there is no neutrino in argentino

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Autodynamics is the first alternative to describing decay without the need for the neutrino. In fact, it presents a reason for why the neutrino was postulated in the first place. Not only that, Autodynamics can explain the experimental data without the neutrino. This is how those who are advancing Autodynamics sees the neutrino story:

Autodynamics describes all decay cases without the neutrino.
Special Relativity has a "hidden" mathematical assumption that caused its inability to describe decay cases.
With its inability to describe decay cases, the neutrino was postulated. (magical)
Autodynamics can describe data that Special Relativity cannot.

In closing...
The goal of Autodynamics is not to eliminate the neutrino...

http://www.sciencedaily.com/releases/2002/01/020129073111.htm

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a third possibility, that neutrinos traveling from the sun changed their character," Snover said.

Together, the Sudbury and Super-Kamiokande experiments demonstrated the third possibility was the correct one. All solar neutrinos start in the electron "flavor," but the two underground experiments showed that some of those change to the tau or muon varieties, and that the total of all three varieties coming from the sun totals roughly what physicists would expect to see.


everything is true, the opposite of everything is also true

Chipper Q
Chipper Q
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From the Argentino

From the Argentino link:

Quote:
And since Autodynamics does not need the neutrino to conserve energy or momentum, this list heightens our suspicions about the neutrino's existence.


Jeepers, gravitonring, if ya don't count all the beans, you obviously won't notice the missing ones!

@nne
@nne
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RE: RE: We refer to dark

Message 38381 in response to message 38378

Quote:
Quote:
We refer to dark matter as "masse manquante" (missing mass)

That characterization reminds me of the neutrino. Does anyone know what percentage of cosmological mass is attributed to all the neutrinos created (emitted?) during the big bang, and during the last ~14 billion years? Or is the neutrino mass already accounted for in the normal baryonic matter? What about all the neutrinos from all the reactions that led to the observed matter/antimatter asymmetry?

Well, I don't know the answer but I found this :

The Ultimate Neutrino

and this :

STATEMENT: EVIDENCE FOR MASSIVE NEUTRINOS FOUND

We announce today at "Neutrino "98," the international physics conference underway in Takayama, Japan, that the Super-Kamiokande Experiment has found evidence for non-zero neutrino mass. Neutrinos are tiny, electrically neutral, sub-atomic particles. Papers related to the results were submitted to the scientific journals "Physical Review Letters" and "Physics Letters." The experiment yields results that are outside the standard theory of particle physics, which describes the fundamental constituents of matter and their interactions. Until now, there has been no firm evidence that neutrinos possess mass.

The new evidence is based upon studies of neutrinos which are created when cosmic rays, fast-moving particles from space, bombard the earth’s upper atmosphere, producing cascades of secondary particles which rain down upon the earth. Most of these neutrinos pass through the entire earth unscathed. The Super-Kamiokande group uses a large, 50,000-ton tank of highly purified water, located about 1000 meters underground in the Kamioka Mining and Smelting Company Mozumi Mine. Faint flashes of light given off by the neutrino interactions in the tank are detected by more than 13,000 photomultiplier tubes that were manufactured for the experiment by Hamamatsu Corporation.

By classifying the neutrino interactions according to the type of neutrino involved (electron-neutrino or muon-neutrino) and counting their relative numbers as a function of the distance from their creation point, we conclude that the muon-neutrinos are "oscillating." Oscillation is the changing back and forth of a neutrino’s type as it travels through space or matter. This can occur only if the neutrino possesses mass. The Super-Kamiokande result indicates that muon-neutrinos are disappearing into undetected tau-neutrinos or perhaps some other type of neutrino (e.g., sterile-neutrino). The experiment does not determine directly the masses of the neutrinos leading to this effect, but the rate of disappearance suggests that the difference in masses between the oscillating types is very small. The primary result that we are reporting has a statistical significance of more than 5 standard deviations. An independent measurement based on upward-going muons in the detector confirms the result at the level of more than 3 standard deviations.

The Super-Kamiokande Collaboration includes scientists from 23 institutions in Japan and the United States. Principle funding for the experiment is provided by the Japanese Ministry of Education, Science, Sports, and Culture (Mombusho) while funding for the detector’s outer most region is provided by the United States Department of Energy. In addition to advancing our understanding of basic science, the collaboration has established a strong international partnership between the Japanese and American teams.

Since the beginning of its operation in April 1996, the Super Kamiokande experiment has been the most sensitive in the world for monitoring neutrinos from various sources. In our studies, we have found interesting results in the measurements of electron-neutrinos coming from the sun. The number detected is about 35% of the number predicted by the well-established theoretical model of the sun’s neutrino-producing processes. In addition, we obtained an indication that the observed energy spectrum of those neutrinos is deformed from the predicted one. Super-Kamiokande’s observation of too few electron-neutrinos coming from the direction of the sun also may be interpreted as due to oscillations. We are continuing to study this exciting possibility.

Reflecting on the significance of the new finding, we note that massive neutrinos must now be incorporated into the theoretical models of the structure of matter and that astrophysists concerned with finding the "missing" or "dark matter" in the universe, must now consider the neutrino as a serious candidate.

Signed: The Super-Kamiokande Collaboration

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