Planets X and Y orbit each other in space. Which changes would have the greatest effect on increasing the gravitational attraction between the two planets?
Group of answer choices
Halving the mass of planet X and doubling the distance between the planets
Halving the mass of planet X and halving the distance between the planets
Doubling the mass of planet X and halving the distance between the planets
Doubling the mass of planet X and doubling the distance between the planets