That's right. We've just learned to believe that there is only a past and a future, where the future is caused by the past. In Special Relativity those are just

That's right. We've just learned to believe that there is only a past and a future, where the future is caused by the past. In Special Relativity those are just two light cones, but there are always other events. Though, in a flat spacetime they will affect our future, eventually, because we are moving slower than light. In other words, every event is past to some of our future event. The Big Bang is a different story, because the theory says that spacetime is evolving.