Through three elements: time and space. dimension.
The way to explain this kind of crossing problem is: 1. Multiple parallel worlds coexist. 2. Each parallel time has its own independent time. 3. The time point of crossing can only be "now" instead of past and future. 4. Traversal can only be done in parallel worlds.
Let’s talk about the first point first:
the most troublesome thing to achieve time travel is the “grandfather paradox” and the “butterfly effect”. Another way to not kill your own grandfather is to kill your own grandfather in another world, that is, there must be a parallel world. .
The second point: crossing refers to time and dimension, not space (otherwise running can be considered crossing), since it is time, then the time of two parallel times is different (otherwise, how can you go back to the "past"). In fact, it is not difficult to understand that according to Einstein's theory of relativity, different moving objects have different time elapses themselves (for example: one year when you sit on the speed of light spacecraft is equal to one hundred years on the earth).
The third point: According to the law of conservation of energy, you cannot go back to the past, you can only make changes at the "now" point in time. The "butterfly effect" will make the relevant matter in the present world disappear from the things you do when you travel back.
Fourth point: Friends who have watched "The Night the Comet Came" will remember that multiple parallel times intersect, and each parallel world has its own. The time of parallel time is different from your world, for example, you are in 2015, that is 1995, then you can see your childhood self, not a "ghost", which explains "when you travel through time, you can't see" you"" (an important one of the movie "Hot Questions About Time Travel").
For example, in "Looking for Qin Ji", Xiang Shaolong traveled from world A to the Qin Dynasty in world B, so whatever he did in world B would not affect the development of A. For world A->B, he just completed the The transfer of energy rather than its disappearance.
For example, "The Night When the Comet Came", the arrival of the comet triggers the interweaving of parallel worlds. People in different dimensions can meet each other. After the comet leaves, dust will return to dust. Live on until the comet comes again one day. . . In fact, I think this level of understanding is the closest to physical theory. Taking the earth as a reference, the high-speed motion of the comet will slow down the time around it. If someone dances on the comet, the people on earth will see slow motion that is many times slower.
For example, in "Black Hole Frequency", the appearance of aurora has established a connection between fathers and sons of different dimensions. Radio connections are transdimensional, not historically vertical. The boy was also the father who saved another world, and the father of the world he was in was already a fire fighting hero.
With the above four points, all kinds of problems caused by crossing will be solved easily. Corrections are welcome.
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