Making a material fade off(progressive transparency from front to back) based on the location of its geometry I'd like to make this object half transparent, on one side and half atmosphere-looking in the front.

Here is what I'd like to look like :



Here is what I currently have :
 
Also note that the geometry is like this :


The inner part of the object is the light emissive part, and the outer region is for the atmosphere, I gave them both different materials, I want the effect I am talking about on the outer material.

Thanks for any help!
You can try something like this:

This is the same set up from your previous Question what was added was a gradient texture node added to the beginning of the chain of nodes. I put the color ramp node so you can control where the falloff to transparency ends.