XPost: sci.physics   
   From: poutnik4nntp@gmail.com   
      
   On 03/13/2017 06:32 PM, Norm X wrote:   
   > Hi,   
   >   
   > The Local Group comprises more than 54 galaxies,and its gravitational center   
   > of mass is located between the Milky Way and the Andromeda Galaxy.   
   > Otherwise, the Local Group center of mass is only known with great   
   > uncertainty. This is important because beyond the Local Group galaxies   
   > exceed escape velocity, and can be ignored in practical cosmology.   
   >   
   > One statement of Heisenberg's uncertainty principle says the dot product of   
   > position and momentum vectors cannot be zero. When equated to the reduced   
   > Planck constant, this permits us to compute a reasonable estimate of the   
   > uncertainty of the Local Group momentum vector from a reasonable estimate of   
   > its center of mass position. Is this reasonable?   
   >   
   > As I see it, only reasonable estimates of order of magnitude are of value.   
   > But, is this a new question?   
   >   
      
   You try to apply the principle out of its domain of quantum physics.   
      
   Product of uncertainty of the momentum and position   
   in galaxy group context   
   are many many orders higher than Heisenberg unequality,   
   so it plays no role here.   
      
   --   
   Poutnik ( The Pilgrim, Der Wanderer )   
      
   A wise man guards words he says,   
   as they say about him more,   
   than he says about the subject.   
      
   --- SoupGate-Win32 v1.05   
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