Question

gravitational force repulsive at very large distances. This did not significantly affect their predictions of the

motions of the planets, but it allowed an infinite distribution of stars to remain in equilibrium – with the attractive

forces between nearby stars balanced by the repulsive forces from those that were farther away. However, we

now believe such an equilibrium would be unstable: if the stars in some region got only slightly nearer each

other, the attractive forces between them would become stronger and dominate over the repulsive forces so

that the stars would continue to fall toward each other. On the other hand, if the stars got a bit farther away

from each other, the repulsive forces would dominate and drive them farther apart.
(plzzzzzzzzzzzzzzzzz explain this in short)

Answer 1

Hey friend, Harish here.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ 

Here is your answer.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ 

The above mentioned in short form  is given below .

The  gravitational forces is a type of repulsive force and also  attractive force.
All stars and planets in the solar  system in the solar system has a gravitational force between each other.

This is one of the reason for their equilibrium position. And the forces excreted on each other are not very high.So there is just a negligible change in position.
_______________________________________________________ 

Hope my answer is helpful to u.