i think i asked a question here a long time ago and nobody fully answered it so here goes: what is the behavior of gravitons. i know they are virtual particles and cannot be observed, but is there a way to manipulate them such as we can with charged particles? also, have we any observations (or speculations) on an antiparticle for a graviton and if so does it repell? cause that would just be cool... also, what exactly happens when objects are gravitationally attracted. i believe it is the exchange of gravitrons but if so, a)do they therefore travel faster that a photon, b) does the "production" of a graviton reduce an objects mass or alter its energy level like it would during a chemical exchange of electrons? i suppose a graviton can't have any mass or else we'de had a new particle creating gravity for them! ohhh, and also, what relationship does the physical properties of a graviton have in the space-time distortion=gravity theory?