Who knows Andrew Price's blenderguru tutorials knows this one - and you have to do it and to repeat it to learn how to render an earth. Next I will try on the space intro from tomwalks which is even more awesome and builds on this. But it also teached me to create my own which I will upload separately after creating a better setting for it - a stylistic earth render as known from the ZDF german heute journal (news broadcast format on tv). Just to say, of course I rebuild the image from the turorial, so this is not a render duplicate - I even made some small changes ;-).