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I think you want to use that sphere gradient as the factor for the stars.
If you set the gradient to be white where you don’t want the stars, and black where you do want the stars, you can use a MixRGB set to Multiply, using the gradient as a factor, and multiply your stars map in color1 and black color in color2.
That means that the color1 will be afected only in the area where the factor is white, and not affected where the factor is black.
Then, the area afected will be multiplied with color2, but as color2 is set to black, that reads as “0”, and everything that you multiply by 0, will result in 0 too, so it will remain black.
I tried to replicate your nodes, you can try if something like this works, it’s a quick replicate, so dont use my values on the maping and color ramps 🙂
