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I am trying to recreate in Blender some space scene like the one of this image enter image description here

So far, I wanted to create some "clouds/nebulae" that they are somehow "circular" in a given region of the space (Environment texture), so I am using a mask for that like this (so the noise texture is only applied here)

enter image description here

However, I would like to add some "noise" to the edge of that texture so its not that sharp and it adds some randomness to it. Basically, I would like to get something like this (done in photoshop) enter image description here

How could I get something similar using Nodes in Blender?

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If as mentioned in the question this is for an environment texture, we need to have a way to tune where the disk/shape will be displayed in the sky:

enter image description here

A possibility is to calculate the length from 2 coordinates (here X and Z), transform it eventually (square root for instance, optional) and filter using a color ramp. The length from (X,Z) is easier to tune/place than a gradient texture.

The shape orientation in the sky can be defined using a mapping node and its rotations.

The perturbation is given by a musgrave/noise combination (for instance) which displaces a bit the input coordinates.

Playing with it a bit (three settings of this kind) and mixing colors (still as world node tree):

enter image description here

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You could mix a Gradient (in Spherical mode) and a Noise Texture through a MixRGB (in Multiply mode), add a Musgrave Texture before the Gradient to disturb its roundness a bit:

enter image description here

enter image description here

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