Creating a script which applies different drag based on distance to all objects within field

Hello everyone, new here to the community. So I've been creating somewhat of a 2d (with 3d models) space-based game. Now, I have planets that will have predefined mass. What I need to do is create a script which will say something like:

If distance (z) is y2 from sphere (center or surface doesn't matter), apply this (x) angular drag and (w) regular drag.

Where (z) would be distance of object from sphere, (y 1 and 2) would be ranges of distance (affected by mass of the sphere), and (x) (w) would be the two drags based on distance.

Then I would have multiple instances, so as you move away from the sphere, the drag becomes exponentially less until you are "out of the atmosphere" and it equals 0. It doesn't need to be incredibly dynamic, it will basically go from 1 down to 0 by .1 decrements so it only needs 11 ranges. The scope of these planets and size of affected bodies is fairly small in scale.

So I have static spheres which trigger a change in player.rigidbody but I want my script to be dynamic, applied to each planet, and affect all objects within the different spheres of influence.

Thank you for your time.