Answer:
Neptune and the Sun would need to move farther apart.
Explanation:
The equation for gravitational force is F = Gm1m2/d2 where G is the gravitational constant, m1 and m2 are the masses of the bodies in question, and d is the distance between the two.
Since the masses are proportional to the distance, if the mass of one body is reduced, the distance between them must also be reduced in order to keep the same gravitational force between them.
