.This file is devided in to 6 small files because of the uploading issue.
.The earth scene contains 3 spheres,one for starfield,one for earth and the other for cloud.
.The diffuse size is 21k,others are 16k.
.I suggest you render the earth first,and then render the cloud&cloud shadow,falloff mask,citylight mask,etc.This way,the render result would be much better and faster.
.There is a psd file called example.psd(example.rar),this will show you how to do composite work in photoshop.If you make an animation,the technique is the same.I like rendering all layers out and do much 2d work in composite applications just as how vfx guys do.
.The materials are vray materials,and there is vray environment fog effect.