Source Code:

// Persistence of Vision Ray Tracer Scene Description File
// File: .pov
// Vers: 3.5
// Desc:
// Date:
// Auth:


// place all settings of globally influenced features here
global_settings {
  ambient_light rgb 0
}

sky_sphere {
  pigment {
    gradient y
    color_map { [0.0 color rgb .85] [1.0 color blue 0.95] }
  }
}

camera {
  location  <0, 0, -5>
  look_at   <0, 0,  0>
  right     4/3*x  // aspect
}


#declare MediaFactor = 0.00125;
#declare InnerRadius=1;
#declare OuterRadius=InnerRadius+2;

#declare OuterTexture=texture {
  pigment {
    color rgb 0
  }
  finish {
    ambient 0
    diffuse 0.09
    reflection 0.04
  }
}

#declare InnerTexture=texture {
  pigment {
    color rgb 1
  }
  finish {
    ambient 0
    diffuse 0.78
    reflection 0.22
  }
}

light_source {   0*x       color rgb <1,1,1>*2     translate <0, 40, -40>  }

#declare Source =     light_source {
  0
  color rgb <1,1,1>*10
  cylinder
  radius degrees(atan2(InnerRadius,OuterRadius)*1.25)
  falloff degrees(atan2(InnerRadius,OuterRadius)*1.25)
  tightness 100
  point_at -1*x
}

difference {
  union {
    light_source{Source}
    cylinder {
      -x,  0*x, 1.1
      pigment {color rgb <0.5,0.5,1>}
    }
    sphere {
      0, 1.1
      pigment {color rgb <0.5,1,0.5>}
    }
  }
  sphere {
    0, 1.1
    pigment {color rgb 1}
  }
  cylinder {
    -2*x,0.25*x,.5
    pigment {color rgb <1,0.5,0.5>}
  }
  rotate -40*y
}

sphere {
  0,100
  material {
    texture {
      pigment {rgbf 1}
    }
    interior {
      ior 1
      media {
       scattering {
          1, //1-5
          color rgb 1*MediaFactor
        }
      }
    }
  }
  hollow
}

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