This actually illustrates the crux of the problem. Gravity is a single (highly accurate) approximation when applied to 2 objects. But when you have 3 objects in

This actually illustrates the crux of the problem. Gravity is a single (highly accurate) approximation when applied to 2 objects. But when you have 3 objects interacting with each other, the system is chaotic: https://en.m.wikipedia.org/wiki/Three-body_problem https://en.m.wikipedia.org/wiki/Three-body_problem Even if we could estimate all the molecules, cells, and processes of a biological entity to a similar precision as gravity, the errors would compound exponentially.