Which of the following is NOT caused by gravitational force?
A.
Gas and dust come together to form a planet.
B.
Stars cluster together to form a galaxy.
C.
Planets orbit a star.
D.
Two atoms come together to form a molecule.
A.
Gas and dust come together to form a planet.
B.
Stars cluster together to form a galaxy.
C.
Planets orbit a star.
D.
Two atoms come together to form a molecule.