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Strongest Evidence For Dark Mater Yet Discovered
    #5986171 -

Astronomers have found the strongest evidence so far that mysterious particles that don't interact with light are lurking throughout the Universe.

Doug Clowe from the University of Arizona in Tuscon and his collegaues have spied a cluster of galaxies in which the centre of mass is shifted to the side of the bulk of observable material, in a relatively empty patch of sky. This implies that there must be some 'dark matter' filling up the empty space.

Decades ago, researchers found from watching distant galaxies that their gravitational properties cannot be explained by the visible material: they posited that some 'dark matter' must make up the difference. Dark matter is thought to account for roughly a third of the mass in the Universe, although it has never been directly detected.

But not everyone agrees. Some researchers have questioned whether dark matter exists at all; perhaps, they suggest, the discrepancy seen in the mass of distant galaxies is due to a modification in gravity rather than a mysterious set of particles.

The new observation argues against that.

Mass merger

Clowe and collegaues used NASA's Chandra X-ray satellite to spy on a cluster of galaxies known as 1E 0657-56, which is thought to have been born from the recent merger of two other galactic clusters.

At visible wavelengths, 1E 0657-56 looks like an average jumble of galaxies. But in the X-ray spectrum, scientists were able to see two massive clouds of dust in between the galaxy clusters, left over from the explosive collision of the original two clusters. These clouds of dust are ten times more massive than the galaxies themselves.

Yet, by observing the way that light from background galaxies is bent by the strong gravitational field of the dust and galaxies in the foreground, the team has concluded that the centre of mass for 1E 0657-56 is shifted out towards the smaller galaxies rather than lying within the more massive dust clouds. So there must be something, they say, filling up the dark patches of these galaxies to lend them extra weight.

"The great thing about this is that you can say that dark matter does exist," says Sean Carroll, a theoretical astrophysicist at the University of Chicago, Illinois.

But not everyone is convinced. A paper accepted by the Monthly Notices of the Royal Astronomical Society1 suggests that modified versions of gravity could still account for the discrepancy.

http://www.nature.com/news/2006/060821/full/060821-6.html


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1) You can't get married to your spouse who is the same sex as you.
2) You can't have an abortion no matter how much you don't want a child.
3) You can't have a certain plant in your possession or you'll get locked up with a rapist and a murderer.

4) We need a smaller, less-intrusive government.

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Re: Strongest Evidence For Dark Mater Yet Discovered [Re: Diploid]
    #5986246 -

> But not everyone is convinced.

Count me in this group... I still suspect dark mater/dark energy will turn out to be as accurate as "ether" was for EM wave propagation.


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Just another spore in the wind.

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Re: Strongest Evidence For Dark Mater Yet Discovered [Re: Seuss]
    #5986420 -

I heard about this on NPR this morning, and I wish I could accurately quote what they said. What I heard in the one minute report was something to the effect that scientists found evidence for dark matter when they found a region of space with nothing in it, heh. Now I know they have to put it in simple terms, but they didn't state any facts and personally argued the case of dark matter about as well as a kid can argue in defense of their invisible friend.

In with Seuss though, in the end I would hope they can find a testable explanation for dark matter. Being told it's simply invisible sounds like something I would have heard in sunday school as a kid.


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Re: Strongest Evidence For Dark Mater Yet Discovered [Re: phalcon005]
    #5986528 -

scientists found evidence for dark matter when they found a region of space with nothing in it

There must be dark matter in my refrigerator then. :grin:


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Republican Values:

1) You can't get married to your spouse who is the same sex as you.
2) You can't have an abortion no matter how much you don't want a child.
3) You can't have a certain plant in your possession or you'll get locked up with a rapist and a murderer.

4) We need a smaller, less-intrusive government.

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Re: Strongest Evidence For Dark Mater Yet Discovered [Re: Diploid]
    #5986707 -

Diploid said:
scientists found evidence for dark matter when they found a region of space with nothing in it

There must be dark matter in my refrigerator then. :grin:


I'll see your empty space and raise you one out of control science experiment... I'm pretty sure the stuff growing inside my fridge came from the outside of the Mir space station.  It laughs at bleach and eats soap for breakfast.


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Just another spore in the wind.

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Re: Strongest Evidence For Dark Mater Yet Discovered [Re: Diploid]
    #5987441 -

What I'm waiting for is for scientists to figure out what exactly dark matter is.


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Re: Strongest Evidence For Dark Mater Yet Discovered [Re: Silversoul]
    #5987511 -

its dark, thats for sure.


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The DJ's took pills to stay awake and play for seven days.

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