Gravity then pulls billions of particles to gather into a huge ball.
(Gravity; pulls; billions of particles; to gather into a huge ball; T:then) Context(Gravity pulls,List([0, 18))):(Gravity; pulls billions of particles to gather; into a huge ball)
Gravity pulls,List([0, 18))
Gravity Gravity
pulls pulls billions of particles to gather
billions of particles to gather into a huge ball T:then
into a huge ball