In this video I'm gonna make similar planet from scratch and I'll show a few technics which I used for Trapcode Planet. I know, final result need better color correction and settings need much more tweaks, but I'll hope you'll get main idea.
Obj model from c4d: https://dl.dropboxusercontent.com/u/15988061/SELL/sphere%20with%20normals.obj
Software: after effects (Trapcode form, trapcode particular, magic bullet looks)
Trapcode Planet vimeo.com/41519976
Also check out other tutorials on my web site http://philipppavlov.com/tutorials
P.S. If you make test based in this tut, please add link on this video tuts in your description. Thanks!