I don't have the source at my fingertips right now, but it was basically
a combination of scattering media (type 1) and a complementing
absorption media (using a _nearly_ identical color to the scattering
media). If you will pardon some generic code, it was roughly as follows
 
sphere{
 y-earth_radius+camera_position, earth_radius+scat_atmosphere_height
hollow 
 pigment{clear}}
 interior{media{scattering{1 scat_color*scat_intensity, extinction 0}}} 
}
sphere{
 y-earth_radius+camera_position, earth_radius+absorp_atmosphere_height
hollow 
 pigment{clear}}
 interior{media{absorption absorp_color*absorp_intensity}}} 
}

Mind you, this is likely not the best nor final solution.

Abe

_Light_Beam_ wrote:
> 
> Can we know the media you used to make this blue haze (source ?) Thanks.
> 

> 3d3e04bb@news.povray.org...
> > Wow! Yet another render that cures our Terragen envy! :)
> >
> >

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