This came from New Scientist and wouldnt you know tells just enough to get you going and if you want the end of the story you can subscribe... well I wont be but what do you think of the point made toward the end about the expectation that dark matter should be found at gallactic centre.. you would think so ?? any as ideas I wont be getting to see the end of the story.
The new dark age
25 January 2003
Stephen Battersby
Magazine issue 2379
EIGHT years ago, in Berkeley, California, Ben Moore realised that he didn't know what the Universe was made of. It was a significant moment.
At the time, the Universe was supposed to be largely composed of a slippery substance called cold dark matter. Although no one had ever detected it, there was enough circumstantial evidence to convince astrophysicists that this invisible gunk made up 90 per cent of the Universe. The ordinary matter that stars, people and magazines are made of was thought to be just a tiny proportion of the Universe's stuff. But Moore had discovered a flaw in the idea.
If cold dark matter behaves as physicists had thought, its gravity would make it collect in galactic cores. But, Moore noticed, it doesn't. In an effort to explain this revelation, physicists have had to concoct exotic alternatives to cold dark matter. Others have leaped to its defence, casting ...
end quote
alex
G'day Alex, I suppose that if dark matter is, and it is uniformly spread throughout the universe, then there would be no compelling force to make it clump in the center of a galaxy or anywhere else. Indeed it is unlikely that normal matter clumps in the center of a galaxy either. Sure the cores are dense, but if the outer lying material were to be lumped together, which would be the more massive? We are told by those who 'know' that some galaxies are tearing each other apart; so much for dominant gravity fields at the cores.
cheers.....
Thanks Doug I figure if he had something really new and different we would have heard more than that little reference as it would be of such significance more would be out there (news of dark matter not more dark matter ). Thanks for your input
). Thanks for your input
