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NASA says it has found proof of existence of dark matter


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US astronomers on Tuesday presented the most solid proof yet of the existence of dark matter, a mysterious substance believed to make up more than a quarter of the universe.

Astronomers using the Hubble Space Telescope spotted a ring of dark matter in a galaxy cluster some five billion light-years away from Earth, which measured some 2.6 million light-years across.

"This is the first time we have detected dark matter as having a unique structure that is different from the gas and galaxies in the cluster," said James Jee, a member of NASA's team of astronomers.

Astronomers have long suspected there must be some substance holding galaxy clusters together, otherwise galaxies would only have the gravity from their visible stars, which would not be enough to keep them from flying apart.

Though invisible, astronomers have inferred dark matter exists by observing how its gravity bends the light of more distant background galaxies.

"Although the invisible matter has been found before in other galaxy clusters, it has never been detected to be so largely separated from the hot gas and the galaxies that make up galaxy clusters," said Jee, who works at the Johns Hopkins University.

"By seeing a dark matter structure that is not traced by galaxies and hot gas, we can study how it behaves differently from normal matter," he said.

US astronomers said they made the discovery accidentally while mapping the distribution of dark matter within the ZwC10024+1652 cluster in August 2006.

As they studied their data the astronomers noticed a ripple in the dark matter, similar to ripples created when a stone is plopped into a pond.

Jee said that at first he was upset when he found the ring because he thought there was a flaw in the team's data reduction.

He then found research published in 2002 suggesting that the cluster under observation had collided with another cluster one to two billion years ago.

The collision occurred along Earths line of sight, and from this perspective the dark-matter structure looks like a ring.

In a computer simulation of a galaxy clusters collision, dark matter first falls to the center of the combined cluster, then moves outward but begins to slow under the pull of gravity.

NASA described the phenomenon in a statement as being "like cars bunched up on a highway."

"Nature is doing an experiment for us that we can't do in a lab, and it agrees with our theoretical models," said team member Holland Ford, also of Johns Hopkins University.

The galaxy cluster collision "created a ripple of dark matter which left distinct footprints in the shapes of the background galaxies," said Jee.

"It's like looking at the pebbles on the bottom of a pond with ripples on the surface. The pebbles' shapes appear to change as the ripples pass over them," Jee said.

"So, too, the background galaxies behind the ring show coherent changes in their shapes due to the presence of the dense ring."

Source: Yahoo! News

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lmao, yet again, it's we're only now that we're starting to get proof that Einstein's 'wrong' theories were actually right. btw, his 'cosmological constant' theory was one of his two 1917 papers -- so that makes him 90 years ahead of his time :P

imagine what he could do with a computer... :nono:

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the 'black matter' theory is a direct result of scientists trying to prove Einstein's 'cosmological constant' theory that the universe is some how held together by some, at that time, unknown force -- which was written in the first of the 2 papers he published in 1917. don't know how that could be considered disinformation? :nono:

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I was being sardonic about the "news-flash" discovery by NASA, NOT of Einstein, his theories or your thoughts.

I didn't mean that Einstein's theory of "Cosmological Constant" or the theory of "Dark Matter" is disinformation. Like you said, he was a man ahead of his time. I wonder what he would think of that expression? :unsure: I think he was beyond brilliant. And NASA is filled with brilliance as well. I do however feel that NASA's experiments and studies in this area, despite some promising results, still remain inconclusive....like so many things we speculate about in our universe. So, my point was: Who knows what really is going on? Still there is much secrecy, contradictory statements, etc. abound in this world...The "News" we're actually getting may have a net effect of disinformation is all I meant. Of course being disinformed about science and technology is just something that the public has had to endure for quite some time. The private sector basically distills science that isn't ready for public consumption. Perhaps that is why the theories were "wrong" for so long, even though they've constantly been trying to prove them. So much knowledge is withheld. The diffusion of this knowledge would empower JQP to the point that much of the central infrastructure (super profits and power) could be eliminated. Control of information is a powerful thing indeed. Disinformation about anything can be a powerful weapon. The American government would never be guilty of that nor need a weapon as such....would they?

Hmmm, I certainly went on a tangent there...sorry about that. I suppose I just have always been skeptical of the scientific information that we are privy to...it always seems to be proven wrong one day or conversely the next.

Uh,....what I really wanted to say was: Dark Matter rocks! (or at least we think it does) ;)

Oh and by the way, that is a fascinating photo from Hubble!

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