Unless the movie assumes that a parallel universe is established, and many things have not been confirmed by science, it is actually said to be hard science, which is hard.
Suppose: ① Among the many parallel universes, one of the parallel universes is the same as the current universe, and is a little ahead of this universe, as well as the A and B universes; ② When the black hole distorts the space-time due to the huge gravitational field, the parallel universes will intersect and affect each other. What happens in this universe The things that happened in the other intersecting universe had an effect, and the paranormal phenomenon occurred, that is, what happened in the black hole would persist and affect each other in the other intersecting universe.
So:
① A universe girl's father went out into space very early. After a series of events, he fell into an unknown black hole, and the time and space were distorted. He found their study (space distortion), and told the present to follow through the study. What happened to his daughter in universe A, who was the same age, was to stay. When he saw the multi-dimensional world in the black hole and pushed books, it affected the study of universe B. At that time, universe B was still the daughter of a little girl, and the little girl cracked it. stay. In universe A, the father hangs the ball after sending the stay to his adult daughter. However, the human embryos on another planet in universe A have developed well. After an unknown amount of time, this human has mastered higher technology and even interstellar travel, making black and white holes and other technologies. They want to go back to the solar system to see their ancestors In the place where we have survived, we created black holes and wormholes in solar energy (this black hole may also be created by any higher intelligent creatures in a parallel universe), so that we can go back, black holes are where parallel universes intersect, so in the B universe There will also be a black hole suddenly appearing in the B universe. The existence of the black hole will change the gravitational field, so the gravity of the earth in the B universe will change.
② There are multiple black holes and white holes in the universe, which are connected by wormholes. The black and white holes and wormholes retain the things that parallel universes have done in them. They are also channels for different parallel universes to communicate with each other and between universes. The black hole in world B was created by world A (or other parallel universe worlds).
③ What the male protagonist of World A does remains in a black hole where time is still (the travel time at the speed of light is still), which is equivalent to a letter in a mailbox, circulating in different black holes and wormholes, so the same thing has also been experienced in World B , it's just that when the message of stay crosses and influences each other in the universe, the age of the daughter is different in the A and B worlds. After the remarks made by the robot in the B world in the black hole created by A, the protagonist of the B world felt that there was hope to solve the singularity data, so he conveyed it to his daughter in the B world, and saved the B world.
Through the wormhole, the black holes and white holes of all the worlds are connected together, causing the parallel worlds to interact with each other, and even supernatural phenomena occur. When you do one thing in a black hole, you may have actually changed another through gravity. world, and even travel between different universes. One thing that needs to be said is that in the same universe, time will be different at different points in the same world due to different gravitational forces. When objects advance at the speed of light, time will stop, so time in black holes, white holes and wormholes is still. , and what was done in it survives.
The above is just my own conjecture, otherwise I can't explain it, and I go back to the fallacy of going back to the past to save myself.
There is a problem with this movie expressing that it is time to travel back to the past to change its own settings. I can't justify it myself, and it doesn't explain parallel universes. At least this can be explained.
Finally, what I want to say is: don't call it a hard sci-fi movie, it's not hard at all.
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