XPost: sci.physics, sci.physics.relativity   
   From: glbrad01@insightbb.com   
      
    wrote in message news:41E8C183.5A62@attglobal.net...   
   > George Kinley wrote:   
   >>   
   >> Hi,   
   >> If our galaxy is rotating around other group of galaxy under influenece   
   >> of combined gravity of galaxies, which mean that combined gravity of   
   >> all the galaxy should be more then gravity of individual black hole   
   >> present in the centre of every galaxy, so how does light travel under   
   >> such emmence gravity   
   >   
   > Your statement "that combined gravity of   
   > all the galaxy should be more then gravity of individual black hole"   
   > is naive.   
   >   
   > Gravity is a local force that can be stronger or weaker   
   > at any location.  The effect of gravity NEAR the event   
   > horizon of a black hole is much stronger than the effect   
   > much farther away.  The effect of distant galaxies FAR from   
   > the event horizon is much stronger than the effect of the black   
   > hole.   
   >   
   > Look at Newtonian gravity.  The effect of gravity at the surface   
   > of the earth is much weaker than the gravity of the sun that   
   > keeps the earth in orbit.  Otherwise, we would be pulled off   
   > the earth into the sun.   
   >   
   > John Anderson   
      
     Galactic clusters have no centralized blackhole holding them together yet   
   their gravity--as a single cluster unit without any single center of gravity   
   to the cluster--draws galaxies from a greater distance than can be accounted   
   for by any galaxy's gravity that is constituent to the galactic cluster.   
   This means the cluster itself must have a local gravity all its own, with a   
   reach all its own, raised in plane from the gravities of the galaxies that   
   constitute it.   
      
     Also, galaxies in cluster do not appear to orbit one another, nor do the   
   clusters as wholes appear to rotate in any way. Therefore nothing should   
   keep those galaxies from immediately rushing together and merging to become   
   one titanic blackhole. Yet something does keep them from it. Some kind of   
   harmonic force--other than angular momentum--keeps them civil in their   
   groupings of many. The gravity of a lot of galaxies in cluster acting upon   
   each galaxy in cluster, in the scheme of clustering, seems to act generally   
   to prevent mergers, therefore any final merger, rather than dictating   
   merger.   
      
   Brad   
      
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