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How to reconcile this undeniable fact
with a statement that stability calls for a minimum of potential
energy? A tiny change in r would not create a restoring force toward
r=R. It would simply changes the orbit, from circular to elliptic.
The
concept of “dynamical equilibrium” was probably invented to describe
stability of orbits. I have a heretical idea on how to reconcile the
apparent paradox. But first I want to know what others think. I do
not
to want to be embarrassed again. . . .