So all those science fiction stories that routinely envision travel into the past are sheer flights of fancy. We can observe the past by 'looking out', but the laws of Physics absolutely prohibit journeys into the past. Travel into the future, however, even at unbelievably high speeds, is not prohibited by any such cause- and- effect arguments.

Travel into the future is quite impossible. Whereas traveling in speeds in excess to that of the speed of light is not impossible. However, by merely traveling faster than light, you cannot effect time in any fashion what-so-ever. You could however have the ability to perceive say some specific event horizon and play back its event horizon data at a faster rate than it is being spread. You cannot travel from a location and return to it at the same moment in time, no matter how fast you could travel. For example, you leave the earth at exact midnight of December 31,1999. You have been de materialized into a beam. Your beam departs at a speed equal to 100 trillion times the speed of light. It is impossible for that beam to reach the earth by return flight before the beginning of the year 2000. Events in time occur sequentially. The light horizons from an event are not the event. If the event is say a super-nova, when the nova explodes, the atomic mass of this structure is radically modified. This change occurs over a small period of time. After that explosion over a short time span, comes the light produced from that event. The actual explosion has ended and the associated light horizon carrying the visual details of that event are shot out at light speed away from the event. Does not every physical movement detect passage? Would not every physical experiment require movement and therefore time for the experiment to occur?