Final answer:
If Earth and Sun were both 4 times heavier but 2 times farther from each other, the gravitation force between them would be 4 times less.
Step-by-step explanation:
To determine the effect on the gravitational force between the Earth and the Sun, we need to consider the changes in mass and distance. If both the Earth and the Sun are 4 times heavier, the gravitational force would be 4 times stronger due to the increase in mass. However, if they are 2 times farther from each other, the gravitational force would decrease by a factor of (1/2)^2 = 1/4. Therefore, the gravitational force between them would be 4 times less.