XPost: sci.astro, sci.physics   
   From: gay@sfu.ca   
      
   Stefan Ram wrote:   
      
   > 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.   
      
   You also need a large _gradient_ of magnetic field. (Unless you have a   
   supply of magnetic monopoles :-))   
      
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