This is just a random inquiry that's confusing me. I remember hearing at one point that the reason no object could travel at the speed of light is that an object with mass going at the speed of light would require an infinite amount of energy to get moving that fast. And that photons could do it because they were massless. But, then, I also recall hearing that photons aren't truly massless...which seems contradictory to me. I can't remember my sources. Was I misinformed about one (or, perhaps both) of these?