Hi Polycount! Decided to create some space stuff using Substance Designer for practice. Time spent was about 10 hours. Critics and comments are all welcome!
Planets all together, rendered in iray:

Machine Planet:

Life Planet:

Gas Planet:

Sun:

City Planet:

Rock Planet:

Hope you enjoy!
Replies
I must know how you did it
Thank you I'm glad you like them! Here is the Machine Planet graph:
Which all the planets I just basically started adding layers and setting alpha to 0 in the gradient nodes. Although, I was careful when working the planet poles to keep from getting a pinching in the texture. I also used a load of transformation and blending nodes.
I actually didn't use a whole lot of noise filters just mainly blending main parts of the planet. The most filters I used is up above, the Machine Planet.