Hi. i have a question.Hope i could get some answers. Say i have 2 identical light emitting bodies placed next to each other, side by side, somewhere in space. Will the photons and gravitons given out by both the bodies collide in mid space? If so, what are the quantum mechanical(since both photons&gravitons are so small)consequences of such an even happending? Also, will the gravitons and photons pass through each other if they are about to experience a head-on collision?