I hear the extreme gravity of black holes bend light ? Light is massless and F=GMm/3^2 , If m is 0 then the force of attraction is zero right ? so light should not be affected by gravity , I also heard people say that the force of gravity is not dependent on mass but is dependent on momentum and energy , but p = mv , and if m is zero p is zero . Can I haz an explanation ? is there some equation that says gravity is influenced by energy rather than mass ?