If you’re gonna write this book I highly recommend taking a physics class where you study the physics of bounding surfaces and energy flux.
I’m sorry but I don’t remember the exact name of the subject matter. But there are all sorts of interesting properties that different geometric configurations of matter have on the resulting gravitational field (same for sound intensity, electric field strength, etc, anything with an inverse square law).
There are some crazy properties of gravitational fields you wouldn’t expect. Like for instance if all mass was contained in a shell of constant density, then the entire space inside that shell is zero-G, regardless of the shell’s shape.
From outside that shell — say it’s a mickey-mouse-shaped shell of matter that’s uniform in density — you experience the gravitational pull of all of Mickey’s mass toward the centroid of that shape. But from anywhere inside that shell — whether you’re in Mickey’s eye or his heart or the tip of his tail — the pull from all the surrounding matter cancels out and you float in zero-G.