. A pair of twins a and b, a are on Earth, and b takes a rocket to travel interstellarly, and after a long period of time, Einstein asserted by the theory of relativity, that the two experienced different times, and b will be younger than a when they reunite. Many people have questions, thinking that a sees b in motion, and b is also moving, why can't a be younger than b? Since the earth can be approximate to an inertial system, b has to go through the process of acceleration and deceleration, which is a reference frame for changing acceleration, which is very complicated to discuss. Therefore, this issue that Einstein has long discussed is mistaken for many people to think that relativity is a contradictory theory. It is much easier to discuss this issue using the concept of space-time chart and world line, but it only requires a lot of mathematical knowledge and formulas. Here, it is just a simplest case to describe the simplest situation. However, only language cannot be used to explain the details in more detail. If you are interested, please refer to some books on the theory of relativity. Our conclusion is that no matter which reference frame is in, b is younger than a.

To simplify the problem, we only discuss this situation. The rocket accelerates to sub-light speed after a very short time. After flying for a period of time, it turns around in a very short time, and then decelerates for a period of time. The purpose of this treatment is to omit the impact of acceleration and deceleration. It is easy to discuss in the Earth reference system. The rocket is always a moving clock, and b is younger than a when reunited. In the Rocket Reference System, the Earth is a moving clock during a uniform speed, and the time progress is slower than in the Rocket, but the most critical part is the rocket's turn. During the turn, the Earth drifts through half a circle from a very short distance behind the Rocket for a very short time, and reaches a very far ahead of the Rocket. This is a "super-light speed" process. It's just this super-light speed.

It is not inconsistent with relativity. This "super-light speed" cannot convey any information, and is not the true super-light speed. Without this turnover process, the rocket and the earth cannot meet. Since different reference systems do not have a unified time, their age cannot be compared, and they can only be compared when they meet. After the rocket turns, b cannot directly accept the information of a because the information transfer takes time. The actual process seen by b is that during the turnover process, the time progress of the earth suddenly accelerates. In b's view, a reality is younger than b, and then he ages rapidly when he turns around. When he returns, a grows slowly than himself. When he meets again, he is still younger than a. In other words, there is no logical contradiction in relativity.

If time travel is possible, why is it not yet filled with time travelers from the future world around us? The subtext of this question is: time travelers have not come around us, and the most likely reason is that time travel has not been realized throughout the long river of time, that is, forever.

Scientists in the end of the world did not regard such a question as a serious theoretical question about the time machine. However, his question still aroused the thinking of some physicists, and they found a possible answer: that is, the theoretical model that we currently know that the possible realization of time travel has a common feature that is that it is not allowed to return to the era before the time machine exists.

Now Lin Feng has solved the crisis of the death world, and the rest is to find another hidden base, which means that there was a phenomenon of space distortion a long time ago, and the former Naia believers used the time when they traveled through the current time to destroy it.

Although Lin Feng has seen the time paradox in his supermarket in a scientific magazine, he still can't figure it out now. Perhaps this is a bottleneck point in time energy. When Lin Feng communicates with the order and correctness of time travel, his time ability will greatly improve.

When thinking about it again, Lin Feng regretted something. If he could get the energy of Kunajeer, would he be able to get the ability to travel through space from him?

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Chapter completed!