b785cc26   
   XPost: sci.physics.relativity, alt.astronomy   
   From: ron@gibbsassociates.co.uk   
      
   "RichD"  wrote in message   
   news:3ba627a4-3d11-4a59-880e-a12319c26b43@po9g2000pbb.googlegroups.com...   
      
   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?   
      
   Also, he says dark energy has negative pressure.   
   What does that mean, how do they measure it?   
      
   --   
   Rich   
      
      
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   ---------------   
   Yet another cross-posted discussion with no relevance to sci.optics? Please   
   consider leaving us out of it.   
      
   Ron   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)