XPost: sci.physics.relativity, alt.astronomy   
   From: chine.bleu@yahoo.com   
      
   In article ,   
    Tom Roberts  wrote:   
      
   > On 6/13/12 6/13/12   10:56 PM, RichD wrote:   
   > > Alex Filippenko, in his lecture on dark energy, said that   
   > > astrophysics can tell the difference between space -   
   > > the vacuum -  expanding, and objects moving through space.   
   > > How?   
   >   
   > An expansion of space, as in the FRW manifolds, is universal, and everything   
   > sufficiently far away will be seen to recede from any point in the manifold,   
   > such as the location of earth. Moving objects, however, are not so   
   > systematic,   
   > and they move in essentially random directions. Moreover, the speed of the   
   > expansion is often/usually larger than typical speeds of moving objects (what   
   > astronomers call their "proper speed", in which "proper" does not have the   
   > meaning used in relativity).   
      
   When a charge is accelerated, it has a magnetic field. If instead the space   
   containing the charge accelerates, does the charge still have a magnetic field?   
      
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