The gravity of the ball caused the matter to be attracted to the center.
(The gravity of the ball; caused; the matter to be attracted to the center) Context(The gravity of the ball caused,List([0, 30))):(the matter; to be attracted; to the center)
The gravity of the ball caused,List([0, 30))
The gravity of the ball the matter
caused to be attracted
the matter to be attracted to the center
to the center