I haven't found any source confirming my thoughts so I guess I'm wrong, but I was hoping someone could explain it to me :) This is how I'm thinking... Mass <=> energy, and therefore you could say that energy is also affected by gravity (light, for example). Then more energetic light should be more affected by gravity than less energetic light, like in the way a heavier object is more affected by the earth than a lighter object. Or am I wrong? For example, is it wrong to say that "energy is affected by gravity"? I guess the common explanation is that light just follows a straight path through universe, thereby being "affected" by bent space-time/gravity... Hope someone can explain this to me. Thanks in advance!