what i learned in science is that theories are never proven, just supported, so many of the theories may be overturned or changed
anyways, light does bend, as it is attracted to gravity (i think it has like a mass of 1/c right? becuase e=mc^2) and also, becuase light is a wave, it has a tendency to spread out after it passes objects, like slits right (i think ive seen a similar experiment)