XPost: sci.astro, sci.physics   
   From: pcdhSpamMeSenseless@electrooptical.net   
      
   On 2026-02-02 12:49, John Hasler wrote:   
   > Jan Panteltje wrote:   
   >> So that makes me wonder if a spacecraft with just a permanent magnet   
   >> that you can moveto give you a force in the direction you want to   
   >> go...   
   >   
   > You can't control the direction of the force.  In any case the magnitude   
   > of the force would probably down there with the light pressure from   
   > stars lightyears away.   
   >   
      
   And a dipole couples to the field gradient, not the field, so the effect   
   would be vanishing**2ly small.  (Or is that vanishing**3fly?)   
      
   Cheers   
      
   Phil Hobbs   
      
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