From: tjroberts137@sbcglobal.net   
      
   On 9/21/17 9/21/17   1:30 AM, Luigi Fortunati wrote:   
   > Newton claims that gravity is a force, Einstein denies it: for him it is not   
   > a force (it is something else).   
      
   Yes, in GR gravity is an aspect of the geometry of spacetime -- it can   
   masquerade as a fictitious "force", like "centrifugal and Coriolis force", due   
   to choice of coordinates.   
      
   > It is obvious that both can not be right: if gravity is a force, Newton is   
   > right and Einstein is wrong, and if it is the reverse Newton is wrong and   
   > Einstein is right.   
      
   It is quite possible, indeed likely, that neither one is "right" (in the sense   
   of describing "how nature really works"). In particular, the disconnect between   
   GR and QM makes most physicists suspect there is a lot more to be learned....   
      
   We humans cannot know "how nature really works", we can only MODEL how nature   
   behaves. This is so because our minds process only thoughts, and the best   
   possible relationship between a thought and a phenomenon in the world is as a   
   model. The modern viewpoint is that Newton and Einstein presented models, not   
   descriptions of "how nature works", for the simple reason that they cannot know   
   the latter.   
      
   	And the word "theory" has connotations that don't apply, so   
   	today particle physics has its standard model, cosmologists   
   	study various cosmological models, etc.   
      
   Tom Roberts   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)