Making Photoreal EARTH ANIMATION in nuke

Hello i am new to nuke but i can see that it has created a lot of buzz.
I am struggling with a project in maya where i have to make a earth animation , problem is with the glow node, even if that can be done in maya i want to know how we can make earth in NUKE, and how to make star particles and gases background, even if in a matte painting.

On my decent core2 duo pc with ati radeon, any texture beyonf 3k in maya gives memmory exception, and the camera angle i need to shoot from is really very close to earth so i downloaded textures of earth at 30KX30K which only nuke can handle . And i also need to know about sun flare, i think i asked too much for a first request . Thanks in advance ppl.