Hi,
thanks for everybody's help, but now I face a different problem.
I'm trying to make an effect of the light coming in through the clouds,
but something in the media is wrong. Here is the source for the light,
media and clouds:

light_source
{
  0*x // light's position (translated below)
  color red 1.0  green 1.0  blue 1  // light's color
  translate <-20000, 30000, 20>
  fade_distance 3000
  fade_power 2
}
 
//media
sphere {<0,00,0>, 1 scale <20000, 20000, 20000> translate -9999*y
    texture {
        pigment {color rgbf <1,1,1,1>}
    }
    interior {
        media {
            intervals 1
            samples 3, 3
            confidence 0.9
            variance 1/128
            ratio 1
            scattering {3, rgb <0.4,0.4,1> extinction 0.0001}
            method 3
            aa_level 4 aa_threshold 0.1
        }
    }
    hollow on
}
#end

//clouds
sphere {<0,00,0>, 1 scale <10100, 10100, 10100> translate -9999*y
	texture {
		pigment {
     agate
    color_map {
        [0.3 rgbft <1, 1, 1, 1>]
        [1.0 rgbft <1, 1, 1, 0>]
        /*[0.3 rgbft <1, 1, 1, 0,1>]
        [0.7 rgbft <1, 1, 1, 0,0.1>] 
        [1.0 rgbft <1, 1, 1, 0,1>]*/
    }
    turbulence 0.03
    ramp_wave
    phase clock
    scale 270
		}
		finish {
			ambient 1
		}
	} 
	hollow on
}

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