How can I mod the visual detail of suns?

What I'd like to do (for example) is mod Earth's Sun to have more detail and more rippling effects. Right now it's coloring (to me) seems a little out of balance... too bright yellowish white. I know there 's .png files in the stars directory that can be edited - but are there any other files that add to a sun/star's 3D visual representation besides those?

Thanks!
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