Android and Planet Rendering

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http://stackoverflow.com – I am learning how to do 3D development on android. I started with a simple rotating planet with some clouds. I have spent past 2 days trying to get atmospheric glow added to the planet. I looked online and tried working with shaders but was unable to get far. My question is, what is the best way to achieve this? I nudge in the right direction may be all I need. I attached a screenshot of the planet I have so far, as well as the end goal I am shooting for. Thank you for any help. Current progress: End Goal: http://25.media.tumblr.com/tumblr_m06q7l7BpO1qk01v6o1_500.png (HowTos)