The Paradox Series: The Grandfather Paradox
The Grandfather Paradox is a scenario implying that time travel exists. Let me explain why it is a paradox. If you were able to get your hands on a time machine and wanted to see your great grandfather, but when you travel back in time you crush him with the machine. Now, this creates a paradox, if you killed your great grandfather, that means that later down the line, you were never born. Now if you were never born, how could you kill your great grandfather which means that he never died, and if he never died that means that you were born, and so forth.
The Grandfather Paradox is a problem the makes time travel to the past theoretically impossible. But, there is a possible solution to the Grandfather Paradox which is all theoretical.
The solution is the theory of multiverses. For every major decision the leads to a different future, another version of the universe is created. Now with this theory, we would never be able to prove this theory. The only way to try to prove this theory would be to create time travel and go through a hole in spacetime, but also create something that could travel at the speed of light and survive going through a black hole. Now, once you go through a black hole there’s no way of coming out of it because on the other side of a black hole is theoretically a white hole, which is pushing equally as hard as the black hole is pulling. You would need to go faster than the speed of light to enter back through the white hole and get out the black hole and that’s not possible. So theoretically the multiverse could be possible but once you get to the other multiverse there’s no way to tell the OE (Original Earth).