Not nearly up to Clay's standards but here is my attempt. 3 spheres: sphere 1 is mapped with an Apophysis fractal with a tad of bump and displacement added and set at fuzzy material; sphere 2 is duplicate of sphere 1 enlarged ever so slightly, rotated a bit and mat has transparency turned up; sphere 3 is even larger with surface atmospheric. I set to cylindrical spots opposite each other, one positive light the other negative.