Trying to get at the problem. I here switched off the sphere 
representing the sky and the atmospheric media. Also corrected the shock 
wave container as follows:

//start code
difference {
   sphere {0, 1.00 hollow}
   sphere {0, 0.98 hollow}
   material {
     texture {pigment {rgbt <1,1,1,1>} }
     interior {
       ior 1.1 	//shock waved air
       media {
         intervals 1
         samples 10, 1000
         scattering {1, 0.0001
           extinction 1
         }
       }
     }
   }
   scale MediaScale * 1.52
   translate <CamLoc.x, CamLoc.y, 5000> + <2800, 0, 0>
}
//end code

While one can see /inside/ the shock wave, it is not possible to see the 
stars through the opposite end of the sphere... why?

Thomas

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