How can I create a material that looks like this?
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3 Concentric Spheres with Emission Particles
Blur in Compositor
Click on images to see larger view.
Compositor with Blur and Alpha Over Nodes. Image Above.
The 3 Object particles and the material settings. 2 are pinned.
Please experiment to your taste and improve. Consider using a more irregular sphere in the center. You may look at the movement of particle system on many frames and choose some particular frame.
Sloppy Imitation which may serve as a starting point. Of course there are alternative and more CPU intensive ways to do this.