To add another "sphere" ,  copy the part of the function that is highlighted and then paste it to a free space in the FE.

All you need to do now is to make some new connections.

1.Connect Input 0 of the new Blender to the output of the previous Blender.
2.Connect the Density output node to the output of the new Blender.

This adds a 3rd sphere, which you can position and scale exacly like the 1st and 2nd sphere.

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