Is time travel really possible? If so, how can it be achieved? If we think deeply about
this question, then we will eventually fall into the "grandfather paradox". If you could go back in time in a time machine, if you happened to kill your maternal grandfather before getting married. So... so where did you come from? Then without you, there would be no death of the grandfather, so, if your grandfather is still alive, then the condition is denied.
However, we cannot conclude that a time machine will never exist simply because of logical reasoning, because the conditional qualification of this proposition is insufficient. We can assume such a situation, you successfully travel back to the past, but you are just an observer, people at that time can't see you, and you can't do anything to change the world at that time, just like watching a movie, only But it's all true 3D. As for how you get back, it depends on how the time machine of the world you exist in is set up.
Therefore, logically speaking, it is possible to invent a time machine. I believe that there will be a pair of invisible hands that can smooth out the paradox of logic. I also believe that what has happened cannot be changed. You relive the past, but it is impossible for you to make any changes to the past, otherwise the universe will collapse because it cannot explain itself.
After all, human beings are not gods or creators. What we can do is to make the world a better place from now on.
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