between any 2 masses is directly ? according to newtons law of universal gravitation, the force of attractionbetweenany two masses is directly related to the ?
proportional to the product of the two masses and inversely proportional to the square of the distance from one center of mass to the other. Something like that.
product of the two masses, AND the inverse of the square power of the distance between them.
it's interesting to add that scientists regard "inversely porportional" as "proportional to the inverse".