Impact of gravity is force (weight).
force of gravity is directly proportional to mass of obj1 into mass of obj2 and inversly proportional to sqr of dist. in b/w centers.
gravity is the most powerful force on the earth.
some imp. theories given by scientist are:-
1.)newton theory of gravitation
2.)Gravity and quantum mechanics
3.)einstein- cartan theory
4.)Guass law of gravity etc.......