From: hitlong@yahoo.com   
      
   On Saturday, January 13, 2018 at 12:56:39 AM UTC-7, Phillip Helbig (undress to   
   reply) wrote:   
   >   
   > The density of a galaxy is, on average, about 1 proton per cubic   
   > centimetre.  So even at quite large redshifts---certainly at the   
   > redshifts where we can see individual galaxies---the density is quite   
   > low, and the gravitational redshift is negligible compared to the   
   > cosmological redshift.  The entire observable universe would fit inside   
   > a ball with the radius of the asteroid belt and be no denser than a   
   > neutron star.  This is an appreciable density, but the cosmological   
   > redshift would again be much larger.   
      
   But a mass with neutron star density only slightly larger than a neutron   
   star would be a black hole ... with infinite red shift :-)   
      
   > In short, there is no mystery here.  The evidence for the big bang from   
   > regions with negligible gravitational redshift is sufficient.   
      
   I'm having trouble picturing why we should see the CMBR at all.  Since it's   
   traveling at the speed of light but we're moving somewhat slower, shouldn't   
   it have passed us long ago?  I know, the FLWR metric must have something to   
   do with it, but ...   
      
   Gary   
      
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