Posted on 08/28/2007 11:51:06 AM PDT by SunkenCiv
Radiation was used to pinpoint the normal matter, while the observation of gravitational lensing was used locate dark matter. Gravitational lensing allows matter to be oberved, even when it does not emit or absorb light, by examining the movement of galaxies as our line of sight passes through the area of interest. Massive objects will distort the image and cause it to move in unexpected directions. Because the normal matter could interact through electromagnetic radiation, it was found to have slowed violently during the collision while the dark matter sailed on through... In the meantime, other astronomers began using gravitational lensing to make a map of dark matter in clusters and it hasn't taken too long to find results that cast doubt on our understanding of dark matter -- though it does not cast doubt on its existence... Dark matter only interacts gravitationally, which means it should not have been slowed up much during the collision -- there is no way to dissipate the energy as it slows and condenses. Each blob of dark matter from the clusters should have continued along the direction of motion of the cluster before the collision, with the odd tweak in direction thanks to gravity. However, something has slowed the dark matter so that it can conglomerate into a dense mass.
(Excerpt) Read more at arstechnica.com ...
Dark matter could be light
Nature Magazine | 17 March 2004 | Philip Ball
Posted on 03/17/2004 10:44:05 AM EST by PatrickHenry
http://www.freerepublic.com/focus/f-news/1099681/posts
“Gamma rays streaming from the centre of our galaxy could be the signature of elusive dark matter, astrophysicists claim. The rays support an exotic theory about dark matter: that it consists of very light particles.”
Huge Hole Found in the Universe
SPACE.com | 8/23/07 | Robert Roy Britt
Posted on 08/23/2007 7:56:57 PM EDT by anymouse
http://www.freerepublic.com/focus/f-news/1885654/posts
Dark Matter, Dark Energy May Be Different Aspects of One Force
Newswise | 30 June 2004 | Staff
Posted on 06/30/2004 7:52:28 PM EDT by PatrickHenry
http://www.freerepublic.com/focus/f-news/1163362/posts
First Dark Matter, Then Dark Energy, Now a Dark Force?
Scientific American ‘blogs | January 8, 2007 | George Musser
Posted on 01/09/2007 3:12:54 AM EST by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1764548/posts
Scientists Examine ‘Dark Energy’ of Antigravity
New York Times | November 16, 2006 | Dennis Overbye
Posted on 11/16/2006 7:27:32 PM EST by SunkenCiv
http://www.freerepublic.com/focus/f-chat/1739970/posts
Supernovae Survey Provides New Clues To Nature Of Mysterious Dark Energy
Science Daily | 18 September 2003 | Vanderbilt University
Posted on 09/18/2003 3:33:13 PM EDT by PatrickHenry
http://www.freerepublic.com/focus/f-news/985086/posts
Why a large hadron collider?
Seed Magazine | 7/6/06 | Edit Staff
Posted on 07/07/2006 2:14:14 PM EDT by LibWhacker
http://www.freerepublic.com/focus/f-news/1661925/posts
Astronomers: Known Universe is Only 5% Matter and 95% Unknown Substance
Source: Beyond 2000
Published: February 1, 2001 Author: Scientists at the U. of Penn, the Institute for Advanced Study in Princeton, U. of Colorado
Posted on 02/03/2001 18:23:13 PST by Bronco Buster
http://www.freerepublic.com/forum/a3a7cbd1142b4.htm
Mysterious force’s long presence
BBC | November 16, 2006
Posted on 11/16/2006 10:22:01 PM EST by Jedi Master Pikachu
http://www.freerepublic.com/focus/f-chat/1740047/posts
Moon measurements might explain away dark energy
The New Scientist | 2/19/05 | Will Knight
Posted on 02/20/2005 5:18:12 PM EST by LibWhacker
http://www.freerepublic.com/focus/f-news/1347416/posts
Dark Matter: Invisible, Mysterious and Perhaps Nonexistent -
Space.com | October 10, 2005 | Robert Roy Britt
Posted on 10/13/2005 11:20:08 AM EDT by UnklGene
http://www.freerepublic.com/focus/f-news/1501785/posts
Dark matter ‘proof’ called into doubt
EurekAlert! News | September 6, 2006 | Staff
Posted on 09/06/2006 3:18:33 PM EDT by DaveLoneRanger
http://www.freerepublic.com/focus/f-news/1696561/posts
These guys just make sh** up as they go along.
L
That headline opens up many opportunities.
Why do you say that?
... like “of course, that was to be expected [Sam Kinison] because IT WAS DARK [/Sam Kinison]
No kidding. I was walking down the street the other day, when some dark matter sidled up to me and conked me over the head! I was left stunned. He laughed at me for being so light-headed, and reminded me I was late for work. Most unexpected way to behave.
It's something the astrophysicists made up because the Universe isn't acting the way their little theories say it should.
So they cooked up this 'dark matter' hokum.
L
Well, more generously (and I believe more accurately), it serves as a lesson in humility regarding the weakness of the syllogism. Pelion on Ossa, doncha know...
"Oh! Ohhhhhhhh!"
This deserves a science bump.
Until Al Gore comments on this finding, I view it with great suspicion.
Darn it, Sam, why’d you have to go and remove yourself from erf? Such a waste.
I’m going to send to you my Aspirin bill! I’ll never catch up on all this reading.
Galaxies are rotating too fast to fit the theory of angular momentum. Also, distant galaxies are expanding faster then they should according to the theory of relativity. Dark matter was theorized to help explain these discrepancies... Now there is something that is causing light to bend, but is not observable by either absorbing or reflecting energy. Since this behavior is neither like regular matter nor a black hole, and the fact that something is generating enough gravity* to cause light to bend they have dubbed it ‘Dark Matter’.
*Yes, I know that gravity is actually a warp in space-time. I am using it as scientific shorthand here.
We do not know the origin of these gamma bursts, it might have been some type of acceleration process that produces different energies as times goes by.
Here is the original article http://arxiv.org/abs/0708.2889
Sorry, that comment should have been for the other article http://www.freerepublic.com/focus/f-chat/1887853/posts ;-)
It’s real if gravitational lensing is real.
Then why isn't it all over my carpet?
Why aren't we being crushed by tons of the stuff?
L
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