I am trying to render two renderlayers, but the second layer black background is on top of the first layer So, I followed some tutorials and modeled planet Earth and an asteroid. Because it's two different compositions I separated each one in a different render layer. But only the asteroid layer is rendering properly, and the planet is not showing. I don't know what I am doing wrong, so I think is easier if you guys check it out if you can.
Here's the .blend
Any help is appreciated, thanks :)
Blend with packed textures
The lens distortion node is making all the pixels in the asteroid layer opaque so that the alpha over covers up the earth layer.

The solution is to do the lens distortion after combining the layers:



The lens distortion should be done after combining layers anyway, as with a real lens everything in the image is distorted.