According to Newtons law of gravitation when 2 masses are separated by distance d ,,, then the gravitational force acting on them is F = Gm1m2/d2 Does this apply to antimatter and antimatter (negative mass and negative mass)?? And also does it apply to matter and antimatter (mass and negative mass)? (I actually am very very new to this concept of antimatter ..... so if I m wrong somewhere please do point out so that I can improve!) Thanks for your help!!