5) Newtonian Gravity : Newton's gravitational force equation is an empirical relation as to what the force must be if the planets are to orbit in their observed fashion.
(Newton's gravitational force equation; is; an empirical relation as to what the force must be) (the force; must be; ) (the planets; are; to orbit in their observed fashion) (the planets; to orbit; )
Newton's gravitational force equation the force the planets the planets
is must be are to orbit
an empirical relation as to what the force must be
to orbit in their observed fashion