We human beings, who exist in the "three-dimensional+time" space-time, naturally feel that grandma is in front and only children and grandchildren are behind. Time is like a long river full of melancholy, which is gone forever. The "we" in the five-dimensional world, that is, the future human beings with highly developed science and technology, have already broken away from the shackles of 3+ 1 dimensional time and space. Their concept of time, as the movie said, can be touched by "walking from this mountain to that mountain". In this case, time has no timing function, but has scales, just like the tunnels connected one after another in the hypercube in the movie. If you watch the American TV series "On the Edge of Crisis", you will definitely remember to compare the water in a test tube to a time observer. Moreover, during this time, the black people in the film also popularized science: time can be compressed or stretched, but matter cannot travel back to the past, and only gravity can affect the past. Cooper, the man behind the bookshelf, uses his hand to pull the gravitational line to transmit information (it's amazing, Nolan imagined the hypercube in the black hole, which is beyond the existing physical cognition, so he doesn't need to comment, just praise. The viewpoint that gravity crosses the dimension is the content of string theory, and the influence of gravity is wide but the intensity is so weak. String theory speculates that gravity comes from higher dimensions, and the intensity of crossing dimensions is weakened. ) In short, is there a Cooper who calculates the coordinates of NASA on the earth first, or a Cooper in the hypercube first? I think the beginning to the end of this whole event and all other possibilities exist at the same time in the time flow, and the causal relationship is only that we are at 3+65438. This man experienced many dangers and finally fell into a black hole, which is just one of all possibilities. According to Murphy's theorem, it may definitely exist. Five-dimensional people chose this timeline and placed a wormhole.