I would allow the onion to begin at the center of the planet. If the
planet sphere has a radius of 99 units, the onion sphere could have a
radius of 100 (just an example). All areas of the onion inside the plant
should be fully transparent
[ 0.00 color rgbf 1.0 ]
[ 0.99 color rgbf 1.0 ]
and only from 0.99 on you can do your atmospheric magic. From 0.99 on,
you might have to work with very low value differences.

I hope I understood your problem correctly.

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