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Galaxies Are Born Of Violence Between Dark Matter and Interstellar Gas

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  • derhexer@aol.com
    URL to an article in Science Daily News _http://www.sciencedaily.com/releases/2007/11/071129183827.htm_
    Message 1 of 1 , Dec 1, 2007
      URL to an article in Science Daily News
      _http://www.sciencedaily.com/releases/2007/11/071129183827.htm_
      (http://www.sciencedaily.com/releases/2007/11/071129183827.htm)


      Also has some links to more articles about dark matter

      First few paragraphs
      "ScienceDaily (Nov. 30, 2007) — Researchers using supercomputer simulations
      have exposed a very violent and critical relationship between interstellar
      gas and dark matter when galaxies are born -- one that has been largely ignored
      by the current model of how the universe evolved.
      See also: The findings, published in Science, solve a longstanding problem
      of the widely accepted model -- Cold Dark Matter cosmology -- which suggests
      there is much more dark matter in the central regions of galaxies than actual
      scientific observations suggest.
      "This standard model has been hugely successful on the largest of
      scales--those above a few million light-years--but suffers from several persistent
      difficulties in predicting the internal properties of galaxies," says Sergey
      Mashchenko, research associate in the Department of Physics & Astronomy at
      McMaster University. "One of the most troublesome issues concerns the mysterious
      dark matter that dominates the mass of most galaxies."
      Supercomputer cosmological simulations prove that indeed, this problem can be
      resolved. Researchers modeled the formation of a dwarf galaxy to illustrate
      the very violent processes galaxies suffer at their births, a process in
      which dense gas clouds in the galaxy form massive stars, which, at the ends of
      their lives, blow up as supernovae.
      "These huge explosions push the interstellar gas clouds back and forth in the
      centre of the galaxy," says Mashchenko, the lead author of the study. "Our
      high-resolution model did extremely accurate simulations, showing that this
      'sloshing' effect -- similar to water in a bathtub-- kicks most of the dark
      matter out of the centre of the galaxy."

      Chris

      ("The avalanche has started, it's too late for the pebbles to vote.")




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