Some months ago I watched this video of Blenderguru about "How to create a realistic earth in blender". In this video blender render is used and now that I understand texturing in cycles a little better I am trying to rebuild this "realistic earth" with cycles.
At about 22:00 min Blenderguru starts explaining how to simulate the atmosphere using blender render. The idea is that near the edges the atmosphere gives a bluish tint to the earth. I tried to work this out with the setup as above (same idea as used for a transparent balloon) but blender guru is doing something with fresnel. I think that is a better solution ? How to simulate the atmosphere with fresnel ?