Travelling to the past. How to do it?

This is part 1 of the blog series called "How To Time Travel".

We are going to discuss the possibility of time travel to the past. Time travel to the future is possible since it has been experimentally proved.according to Einstein's special relativity, for an observer in an inertial frame of reference, a clock that is moving relative to him will be measured to tick slower than a clock that is at rest in his frame of reference. This case is sometimes called special relativistic time, dilation.

To travel to the past we should overcome or vanquish certain paradoxes that arise during and after time travel. Most particularly the grandfather paradox. The grandfather paradox states that if you would time travel to the past and then kill your grandfather, then your father wouldn't be born and implies you weren't born. Then how are you existing in the first place? how are you alive if you were not born at all? This is the paradox.

There are two solutions to this problem.

1.The existence of multiple timelines:  after time traveling to the past and changing certain events, you can still escape the paradox if there are multiple timelines meaning multiple realities, multiple stories. The events in these timelines are very different from the original timeline you time traveled from. According to the paradox killing of your grandfather will result in the shift of timelines. If you would time travel back to the future you cannot return back to the reality you came from because you had changed the events leading to the future. Now you could travel to the future but you would never see yourself in the future.

There is another possibility that is, even if you had changed events in the past you can return back to where you started and have no changes caused due to time travel. But how is it possible? the answer is that the timeline you reached while time traveling is another timeline sharing the same properties as that of the original timeline.

2. Time travel is not possible: another solution to the paradox is that traveling to the past is not possible. This solution easily overwhelms the grandfather paradox. By far this is the most settling answer to the paradox. Biy it is unsettling to we curious heads.

Part 2 is about how to build a time machine. 

Click here for part 2

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