From: PointedEars@web.de   
      
   john larkin wrote:   
   > [...] Thomas 'PointedEars' Lahn  wrote:   
   >> Ian wrote:   
   >>> 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.   
   >>   
   >> What is that even supposed to mean?   
   >   
   > It means that there is no perpetual motion, no free energy.   
      
   My question was what "_gradient_ of magnetic field" is supposed to mean   
   because the magnetic field is a _vector_ field, and the gradient is only   
   defined for *scalar* fields.   
      
   --   
   PointedEars   
      
   Twitter: @PointedEars2   
   Please do not cc me. / Bitte keine Kopien per E-Mail.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)