I know, scientists have claimed that time travel is possible, and I'm not anyone to deny/oppose that viewpoint. But films have so vaguely touched on time travel, making time travel seem so 'easy' and 'perfect'. What I'm about to discuss are, the problems/complications of time travel.
You are taking yourself out of the equation (when traveling to the future)
Many films forget to mention this part. Okay, so you're an unimportant figure, right? So maybe you are. Maybe you won't ever do anything incredible in your life that would reshape the future of mankind. But assuming you live at least up to the age of seventy, your actions will have an impact on someone else. Say for instance, you might save a future president/inventor from some accident.
Because of you time traveling, that important person never survived the accident. So when you travel into the future, your actions changes the future.
How do you stop change in age
It may be simple to travel to the future, but how do you prevent yourself from aging? You belong to a certain time period and time is fluid. When you're moving forward into the future, why won't you age? That's one part where films have never tried to explain. Likewise, when you travel to the past, why won't you get younger?
To add to that, when you reinsert yourself back in the timeline where you once left, you are going to be older than you were when you left that timeline. You have just brought forward your expiration date. I like to think that there are 2 separate entities of timelines: you and the main timeline. Time is "measured" by the rotation of the earth around its own axis, and not determined by it. Again, you're changing the future just by time traveling.
Time travel calculations
1) So when you time travel, you have to be so cautious about everything. First of, you can't ever meet yourself, according to Back to the Future. So you are only safe to travel to time periods where you don't ever exist.
2) Time traveling is difficult; you have to assume that the timeline is constant. So that means that whatever you do, it's already planned out/been done. THIS IS A FLAW IN THE ARGUMENT. What is free will then, if it's already a constant? If free will exists, this is a case of randomness in the timeline. Every timeline you enter and reenter will have a different outcome/situations. For instance on July 2nd 1973, 16:00, you decide to consume an icecream. Assuming that free will exists, you have the chance of not wanting to consume the icecream. If that's the case, I like to assume that every different timeline is different from one another.
When you time travel, essentially, you are taking yourself out of the equation and reinserting yourself into it again. The complications that may arise from that could be that firstly, you don't exist because your parents decide not to meet. You could have been another gender. What I'm trying to say is, each time you time travel, the timeline equation changes. Time is fluid, like water, it never stays constant. And that's why the argument for free will and destiny is tied together with time (I'll cover that viewpoint another time).
Time travel is a very tedious and problematic process, and it's not to be taken lightly. So, time travelers out there, behave yourself.
p.s. don't time travel to fix a problem.
p.p.s. orphans are time travelers who messed up time traveling.
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