XPost: sci.astro, sci.physics   
   From: ram@zedat.fu-berlin.de   
      
   Jan Panteltje  wrote or quoted:   
   >What are the effects of magnetic field lines on star formation in galaxies?   
      
     These natural magnetic fields in galaxies and their gradients,   
     I think, are relatively weak. Over long timescales and over larger   
     spatial regions, their effects can accumulate and become noticeable.   
     But to drive a spacecraft, you'd need fields that are fairly strong   
     at the location of the ship and at the moment the ship is there.   
      
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