From: PointedEars@web.de   
      
   Thomas 'PointedEars' Lahn wrote:   
   > Ross Finlayson wrote:   
   >> Actually, a photon follows about _half_ the curvature of   
   >> spacetime,   
   >   
   > No, you are confusing facts.  The "half" comes from that the angle of   
   > deflection of light as observed, and as predicted by general relativity, is   
   > only half of the angle as predicted by Newtonian mechanics *if* one assumes   
   > that a photon has a non-zero mass that is equivalent to its energy.   
      
   [I always seem to confuse this when I explain it :'-)]   
      
   The correct, observed value is *twice* as large as calculated using Newton's   
   theory and assumptions for the mass of a photon (so the Newtonian value is   
   only half the correct value, not the other way around).   
      
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   PointedEars   
      
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