The topic of time travel is such that it immediately sends you into a thought spiral the moment you start thinking about it even a little bit. The subject is just so interesting that it would force anyone to ponder!
That's why for the longest time, movies, novels and tv shows have featured time travel into their plots and we have watched just about everything that is even remotely related to this topic.
But scientifically, is it possible to travel forward or backwards in time? Well, according to laws of Physics, travelling into the future is possible, if we are able to travel close to the speed of light, but we are really far off from such a capability right now.
As for travelling to the past, the laws of Physics seem to forbid it. Some think that it would be like going against nature because one could change an infinite number of things and mess up time itself. Is that why we have never had time travellers from the future to our time?
No Time Travellers Ever?
Let's say for a second that time travel to the past is possible through some phenomena that we haven't discovered yet. If that is the case, future humans could have discovered it and developed the ability to time travel. So, in that case, what would explain their absence in our time?
Well, maybe future humans take time travel very seriously and only a handful are allowed to do so. Time travellers could be like the army who are well trained and maybe they would travel forward or back in time, anonymously. In that case, we would never notice them since they would know how to blend in with the humans of this time.
Another possibility is that we develop the ability to time travel but it is banned by the world governments owing to the fact that it could be used for disastrous purposes. One more possibility could be that we simply go extinct before we are ever able to develop time travelling capabilities in some sort of dooms day scenario.
Or maybe that it just isn't possible and we'll simply have to accept this. But hey, who knows one day we will have the ability to travel really fast and actually make that trip to the future? Of course one wouldn't be able to come back, but it would be one of the most significant events in human history!