Since, light is always travelling at a constant velocity with respect to everything else, does it also mean that everything else is also travelling at a constant velocity with light? As in, since light is always travelling at C irrespective of our velocity, then does it not also mean that we are also travelling at a constant fixed velocity with respect to light? Is our velocity then taken as 0? If that is the case what does velocity actually mean? With respect to one photon, what would be the velocity of another photon that is travelling towards it? Sorry about these basic questions, I am just a fan pf physics and don't really know anything much about it in detail..