Stephen Hawking's universe and time

I believe many people think that time travel is feasible. This interesting experiment has proved that Hawking wrote a lot of messages to distribute them to different places, invite future people back to the current time to attend his party. Haha, but no one will come when the time is reached. However, Hawking said it would not work if he returned to the previous time, if we can go back to the past, a crazy scientist has returned to the past and shot himself. That is to say, the current scientist will not exist. Who shot the gun. However, Hawking said that he cannot go back to the past, but can go to the future. Today, he will say this, first of all, to say a "justice" (note, I have defined the principles, theorems, and inferences mentioned here and below, but they are not mentioned in science or hawking ): Principle 1: The larger the gravitation, the slower the time passes. This is the most difficult to understand. Therefore, if you cannot understand it, remember it. I cannot tell you what is going on. There are many interesting things in the above principle: the clock downstairs is slower than the clock upstairs, so you are younger than the clock upstairs, but this is really too slow; all satellites have a precise clock, but this clock will always run faster than the clock on the Earth, so it needs to adjust the time difference automatically to be consistent with the time on the earth, otherwise, the problem will be big. If you want to go to the future, you can easily take a high-tech spaceship, find a black hole, and let the spacecraft run around the black hole at the right track at the right speed, five years later, I returned to the earth. It was only five years for people on the ship. But after ten years on the Earth (depending on the situation), it was very violent to fly around the black hole, do not imitate. Inference 1: Time on different planets varies. Therefore, do not be a Martian. In the eyes of the Earth, you will be a little older. Theorem 1: The faster the speed, the slower the time. If the speed is faster, that is to say, it is flying around a high-quality celestial body, which is equivalent to the larger the gravitation, the slower the time (I am not talking about ). To build a large-scale Hadron ordinator in Europe, if a particle that is easy to decay is put into the collision so that it can accelerate to close to the speed of light, then check whether the decay speed of the particle is slower than that of non-acceleration, this can prove the theorem mentioned above. If the speed of a car, train, plane, or spacecraft can be close to the speed of light, you can go to the future. Inference 2: never reach the speed of light. It can only be close to the speed of light.
If it reaches the speed of light, it will stop. If it exceeds the speed of light, it will go back to the past, but it is impossible to go back to the past. If we want to reach the speed of light, we must change the form. We cannot exist in the form of quality, but turn it into energy (this is more pornographic and violent, although it is just a bit of fire, but don't experiment with yourself. Let scientists do experiments with particles.) Maybe the quality of the universe is not enough to make you fly around it to reach the speed of light. The above is purely a self-confidence, and it is only for everyone to achieve the effect of heatstroke prevention and cooling in this hot summer day. However, the theorem inference mentioned above has a certain degree of credibility, not all of which I said, I just summarized the hard-to-understand things so that they can be easily understood.