I thought I'd post a few renders of the earth assignment I give my students in my Texture and Lighting class at Ex'pression College. This was the outcome of my in-class demo of setting up semi-complex shader networks. The whole setup is a series of shaders that layer over top of 3 spheres. The end result produces clouds that cast shadows on the earth's surface, city lights on the unlit side, and a faked volumetric atmosphere.
You can download the ridiculously hi-res textures I used from NASA here. This earth was made in Maya, although I just found a recent tutorial on doing a very similar setup in Blender here.
Below are a few desktop backgrounds for you to download at 1920x1080 resolution.
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