The effect looks AWESOME> Well done! The only problem I have is the planets look dead - like dead moons. IF that's what they are, then you nailed it. LOL. But I think I see some attempts at clouds and atmosphere in the nearest planet. If you soften the cloud areas and add an atmosphere ambience, then you'll have it.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.