a. gravitational forces change into nuclear forces
b. gravitational forces change into electromagnetic forces
c. the gravitational force between them increases
d. the gravitational force between them decreases

Question

a. gravitational forces change into nuclear forces
b. gravitational forces change into electromagnetic forces
c. the gravitational force between them increases
d. the gravitational force between them decreases

anonymous · Answer

a) and b) don't sound physical

c) would happen with increased mass or decreased separation

d) would happen with decreased mass or increased separation

anonymous · Answer

haha! sorry i didnt put the question.. "What happens when gas and dust in the solar system moves closer together?" 
@broken_symmetry

anonymous · Answer

Well that's decreased separation, so I've already answered it :P