Let’s talk about parallel worlds and parallel universes first. It’s easy to understand that in another world with completely different space and time, what you do will only affect and change the world you are in, but not the world you are already in. As for the relationship between parallel worlds and going back to the past in parallel cosmology, I don't know if there is a conflict or not.
The second is to go back to the past. There are two types of returning to the past. One is the butterfly effect. You can only go back to your past self. The choices and changes you make are mostly just to change your life and future, but it does not change the entire history. Speaking of the second type, go back to the past as the future. This has a classic model, the future determines the future. To be clear, we think that people who go back to the past from the future will decide and change the future in a direct or indirect way, but in fact nothing has changed in the end, and the results of everything will not be because you went back or did not go back to the past, did or Nothing has changed. Nothing has changed. History, including the future, is a given. We don't know who made it. However, no matter what external force wants to change the history and the future, it is useless. At most, it is the process of change, and the result will never change.
In fact, let’s be clear, these things are all made out of movies to deceive people. My personal opinion is that people can’t go to the future and can only go back to the past, not the world of the past, but in the space and time of history. In the past space and time, I can't do anything but be a spectator.
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