Travelling at the speed of light is not just hard but impossible for anything that has mass, since it would take infinite energy, so the real question is how close we could get and whether the loophol

Every space story worth its salt eventually reaches for lightspeed, the moment the engines catch and the stars streak. It is one of the oldest dreams in science fiction, so it is worth saying plainly what the physics actually allows, and what it flat... [4838 chars]