A Sci-Fi Concept
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What do Marty McFly, Dr. Who and Bill and Ted have in common? They’re time travelers. They were able to do the impossible and make the voyage through our perception of time. It should go without saying time travel comes with a whole universe of problems, making the possibility extremely unrealistic.
Consider the following: You go back in time and kill your father. Theoretically, you can’t kill him because then you wouldn’t be born to kill him. You do so anyway and it turns out, he isn’t your real father and you actually killed your step-father. You’re real father goes untouched and thus the past and present line up perfectly.
Well, not yet. When you left the present to go into the past, there’s an issue about your body. Do you become a duplicate so you exist in your own present time and in the past or are you displaced from time itself and inserted in another? That also doesn’t make sense because if you follow the rules of what we perceive as time, you’d return to the past as a baby, if even that.
What if you go back in time and kiss your high school crush, making him/her fall in love with you? That should alter the future where you lived by yourself that led you to go to the past in the first place. That kiss and its alteration of history keeps you from going to the past at all.
If in that different chain of events you still go to the past to make it in time for that kiss, you’ll be trapped in a cycle. And consider that all these questions are only applicable if time is cyclical.
If time is linear, your past, present and future aren’t constantly happening somewhere, making time travel impossible (there would be nothing to travel back to). If time was cyclical, this suggests that everything is preordained and you have no free will. What you think of as free will would already be recorded and whatever action you believe is different than the original action is actually the decision you were going to make anyway.Don’t worry, I got lost along the way too. To simplify all this, we look to Stephen Hawking who provides us with one question that indicates whether time travel will ever be possible: Why aren’t we inundated with time travelers from the future? They should be here right now, knowing full well that we’re interested in such topics as time travel to explain just how they accomplish it from a future tens of thousands of years in the future. This isn’t the case because maybe this science fiction dream is just that: a dream.