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Is the Sun surrounded by dark matter ?

Posted on Sunday, 12 August, 2012 | Comment icon 11 comments | News tip by: Waspie_Dwarf

Image credit: NASA

University of Zurich researchers have made the claim after building a simulation of the Milky Way.

The team believe that previous techniques have underestimated the amount of dark matter present in the universe. "We are 99 per cent confident that there is dark matter near the Sun," said lead author Silvia Garbari. Dark matter is a theoretical and directly undetectable type of matter that is thought to account for a large part of the total mass of the universe.

"This could be the first evidence for a 'disc' of dark matter in our Galaxy, as recently predicted by theory and numerical simulations of galaxy formation, or it could mean that the dark matter halo of our galaxy is squashed, boosting the local dark matter density," said Garbari.

"The researchers then developed a new unbiased technique that recovered the correct answer from the simulated data."

  View: Full article |  Source: Economic Times

  Discuss: View comments (11)


Recent comments on this story
Comment icon #2 Posted by Imaginarynumber1 on 12 August, 2012, 23:14
That's just a side view of a solar prominence in the video.
Comment icon #3 Posted by notoverrated on 12 August, 2012, 23:33
so the only way they know dark matter is there is because there is unaccountable matter in the universe? that's some problem solving right there.
Comment icon #4 Posted by Waspie_Dwarf on 12 August, 2012, 23:37
Pretty much. In simplified form (so that I can understand it ) how matter effects gravity is well understood and measurable. Observing galaxies and other objects in the universe shows that they are effected by more gravity than can be accounted for by normal matter, hence dark matter must exist.
Comment icon #5 Posted by shaddow134 on 15 August, 2012, 23:41
Again the mythical Dark Matter,but Where's the proof ? Dark matter versus Modified Gravity.Where do people stand?
Comment icon #6 Posted by sepulchrave on 16 August, 2012, 5:39
There is a lot of evidence for dark matter. It seems to me that most criticisms of dark matter stem from the fact that we haven't found it yet. Of course if it actually is ``dark'' - i.e. doesn't interact with electromagnetic fields - then it really isn't that surprising that we haven't found it yet. I personally don't like dark matter (and I especially don't like dark energy). I really don't like modified Newtonian dynamics (MOND); I think the way they have to rewrite the operator in Poisson's formula to balance out the conservation laws is just too..... [More]
Comment icon #7 Posted by Pyridium on 16 August, 2012, 19:46
Matter is defined as an atom. Dark matter, should be called "dark particles", because it is particles that have not formed into an atom. All matter, atoms, have a gravitational force...pull. All dark particles have the opposite force,..push, or as I call it, anti-gravity. Dark particles do interact with matter, the particles are simply "pushed away" from normal, atom matter. Dark matter is at rest while dark energy is the particles moving at close to the speed of light. For a sense of scale, 1 hydrogen atom can contain trillions of trillions of dark particles in the same vo... [More]
Comment icon #8 Posted by sepulchrave on 16 August, 2012, 21:03
Sure. No. [list=1] [*] Gravity is a mutually attractive monopole force which is proportional to a property we call ``mass''. An object with a positive mass will experience a gravitational attraction towards other objects with positive masses, and gravitational repulsion towards other objects with negative masses (as of yet no negative mass object has been experimentally identified). [*] The entire prediction of dark matter rests on it having (and, often, only having) positive mass. Perhaps you are thinking of ``dark energy''? The two are quite different. [/list] No. Dark ... [More]
Comment icon #9 Posted by shaddow134 on 16 August, 2012, 23:35
How can you say what Dark Matter or Dark Energy does or how it interacts,there is no proof whatsoever that they exist. You claim that Dark Matter has gravitational mass from what Evidence? Dark Matter is still theoretical and nobody is certain that it exists..
Comment icon #10 Posted by sepulchrave on 17 August, 2012, 2:42
Dark matter wasn't hypothesized ``just because''. It was hypothesized because the rotation and collisions between galaxies indicated that - if gravity according to General Relativity is correct - there should be a significant additional quantity of mass in the outer halo of these galaxies. Since there is no visible evidence for this mass, it was called ``dark matter''. If there is some additional component to our Universe that does not exhibit gravitational mass, then it cannot be an explanation for cosmological anomalies (like galactic rotation curves, the bullet cluster... [More]

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