How to Add Shininess on this Sun Object? I need to Add Some Extra Highlight/Shine/Glossy to My Sun Object such that It feels like Sun is Emitting Sun-rays.

My Scene : 


It must feel like something like this : 



Options I have tried : 


Increasing Strength of Emission Parameter of Sun. (No Effect)
Mixing Glossy Shader with Emission Shader. (No Effect)
You could use compositor and add Filter/Glare node.