I'm kinda new to making "good" media effects, and after looking at the Media Sky
animation by Thies Heidecke, I was once again inspired to try 
a media sky image.  The only problem I'm having is what to do at the horizon.  Since
I'm using a sphere within a sphere model, I can't just use 
"fog" as an internal Povray effect.  I figure I need to creat another sphere for the
fog effect.  So, the trouble I'm running into is that, 
seen from the "ground" sphere, I can't see through the "fog" sphere to see the "sky"
sphere.  Pictures attached show what I'm talking about.  
First image shows scene without "fog" sphere.  Second is with.

Also, I can't see my "sun" sphere behind the "sky" sphere.  I guess it's really all
the same question, but what am I missing?  How can I make a 
media sphere transparent in order to see through it?

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Preview of image 'planetsurface.png'

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