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Big Find: Dark Matter Strand Connecting Galaxy Clusters

Find confirms theories on universe's formation

By Rob Quinn,  Newser Staff

Posted Jul 5, 2012 4:28 AM CDT

(Newser) – This is shaping up to be one hell of a week for scientists trying to figure out the mysteries of the universe. Hot on the heels of the apparent Higgs boson discovery, an international team of astrophysicists has revealed that it has spotted a filament of dark matter connecting two clusters of galaxies, reports the Los Angeles Times. The mysterious matter is believed to make up most of the matter in the universe, and to give the cosmic web of stars and galaxies its shape; but until now, it had only been detected in clumps, not strands.

The strand—which stretches for 58 million light years between the galaxy clusters Abell 222 and Abell 223—was detected through an analysis of background light from 40,000 galaxies, which found that space and time were being warped by an unseen mass. Other scientists hailed the team for turning the strands from theory to fact. "It's a resounding confirmation of the standard theory of structure formation of the universe," an astronomer at the University Observatory Munich says. "And it's a confirmation people didn't think was possible at this point."

Abell 222 and Abell 223 are relatively close together, making it possible to detect the strand of dark matter between them.
Abell 222 and Abell 223 are relatively close together, making it possible to detect the strand of dark matter between them.   (European Space Agency)
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COMMENTS
Showing 3 of 17 comments
XYandZ
Jul 5, 2012 2:54 PM CDT
i used to be a lot more interested in things like this when i was younger but now it just seems trivial..all that tax payer money wasted on what is essentially a hobby for these guys, i wish they would make them get private investment like they did with SETI..tax payer money shouldn't be wasted on triva
JoeQ
Jul 5, 2012 2:53 PM CDT
Yep, they detect it by refraction of light from the curvature of the intervening space (gravitational lensing).  Problem is, we Earthlings only have one point of view (not two, like in binocular vision).  That means astronomers have to rely very heavily on statistics to infer the 3D structure. Read the full article to understand the assumptions they had to apply. They end up worrying a lot about seeing "pink elephants" in the data, something quite easy to do. Again, read the article for the "pink elephant" quote from the actual scientist.  So, Jeffrey-Lebowski, what you are seeing in that 3D rendering is not what they KNOW is dark matter, but what they HAVE LITTLE REASON TO BELIEVE IS NOT dark matter. Such distinctions are becoming crucial in this day and age. Which is not to say dark matter does not exist.  It most likely does, but no person on Earth knows if it exists in the massive AMOUNT they think it needs to to fit with current theories, by that I mean some variation of GR and the FLRW metric.  And also Dark Energy is a complete contrivance needed for the same set of theories elsewhere. Which is why Neumahn's first comment was spot on.  Sometimes a comment on a science story isn't just a matter of "science lovers" or "science haters". Personally, what I hate is when somebody gives an actual substantive educated and nuanced comment for a change, something more than rah-rah or catcalls, and gets slapped down.
Jeffrey-Lebowski
Jul 5, 2012 1:40 PM CDT
Dark matter is for reals dudes. Oh ye of little faith can check this out. http://asymptotia.com/2007/01/07/dark-matter-in-3d/
 

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