Is it possible - using editable images or mesh - to make a mesh increasingly transparent towards the centre?

image

Is it possible - using editable images or mesh - to make a mesh increasingly transparent towards the centre?
Ideally, it should also be able to have varying transparencies at different points. Many thanks.


image

The image above shows some crude examples of using a semi-transparent texture on regular meshes, allowing for mesh with transparent areas.

You may need a special mesh for an effect like your image. Layers of circles, or spheres within spheres are possible solutions.