b785cc26   
   XPost: sci.physics.relativity, alt.astronomy   
   From: user@localhost.invalid   
      
   On 6/13/2012 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?   
   >   
   > Also, he says dark energy has negative pressure.   
   > What does that mean, how do they measure it?   
   >   
   > --   
   > Rich   
      
   Negative pressure? Sounds like anti gravity.   
   That's it. I'm making plans to drag ol Bessie   
   out to the observing site Saturday. I got the bug.   
   ((¦ :->)   
      
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