this is gonna sound dumb, but here i go. through out my schooling i was preached " in a vaccum, a feather and a bowling ball would fall at the same rate". -thinking about the difference in theories with Aristotol, Galileo, and Newton, something didn't make sense to me. Talking about the Newtons' gravitational constant, wouldn't you have to measure the average gravitational constant of both m1 and m2 before finding it; furthermore, of all the mass of the particles involved, and doesn't the distance from the center point of each particle change the gravitational constant? If this is true, wouldn't Aristotol be, not perfect, but more accurate than Galileo? And one more thought, doesn't Newton's laws on gravitational attraction contradict the idea of, in a vacuum, a feather and a bowling ball falling at the same rate? The mass of the bowling ball is more than the feather, and when add to the mass of the planet, would have a greater attraction; and when adding Einstein's theories of perspective from the planet the bowling ball would fall and hit first.