Hi, how can I make this volume start rendering from the surface of the sphere (where the brightest white is) and not stretch until its center of mass?
Thank you.
Volumes do not have a surface.
I would try making a sphere a little larger that your planet and giving it a solidify modifier so that it is “hollow” inside. (I did not have a suitable image)
Thank you, exactly what I needed 
If you don’t mind, why does solidify make the sphere hollow?
Because it gives the surface thickness, therefore there is nothing in middle.
Here is with a boolean cube;
The normals of the outer surface point outwards and the inner surface inwards.
(the ridge is created by the boolean modifier)
Edit
Yes the name solidify is a bit misleading, what it does is gives the surface thickness. It solidifies a plane or surface but hollows out a sphere, cube or a “closed object”. 
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