Question

mr. tolman believes that our universe is expanding, but with all of the gravitational force from the celestial bodies of space, the universe will begin to contract. he believes in the

Answer 1

Based on the description, it will be most likely that he believes in Oscillating model (also known as Cyclic model) of the universe

Based on this model, the gravitational force will prevent further expansion by pulling back the matters and undergo a bounce

hope this helps

Answer 2

The Oscillating Universe Theory. It suggests that the universe is a never-ending cycle of expansion and contraction.