Time travel is theoretically feasible. It seems absurd. But it is Einstein's theory of relativity that has led these scientists to go crazy and provided them with theoretical support. In his theory of relativity, Einstein pointed out that in our universe, time and space overlap each other. When the mass and speed of an object continue to increase, the time and space of its existence will also change accordingly. Some previous experiments have also proved its correctness. Scientists used a particle accelerator to accelerate particles to near the speed of light, and found that these particles decayed slower than other particles placed in the laboratory.
Time travel is theoretically feasible. It seems absurd. But it is Einstein's theory of relativity that has led these scientists to go crazy and provided them with theoretical support. In his theory of relativity, Einstein pointed out that in our universe, time and space overlap each other. When the mass and speed of an object continue to increase, the time and space of its existence will also change accordingly. Some previous experiments have also proved its correctness. Scientists used a particle accelerator to accelerate particles to near the speed of light, and found that these particles decayed slower than other particles placed in the laboratory.
In Einstein's theory of relativity, a new spatial structure is mentioned - four-dimensional space, which adds one dimension (time axis) to our traditional three-dimensional world (i.e. length, width, height). In the traditional three-dimensional space theory, we can give any substance a coordinate in a relative reference system to indicate its spatial position. This is something we can understand and accept, just like understanding length, width and height. But adding another dimension on top of this, I am afraid it is difficult for us to understand and accept.
Einstein did not leave behind explanations and "model projects" that are sufficient for people to fully affirm. On the contrary, he left us enough room for imagination and exploration. In Einstein's theory of relativity, the speed of light is a very important element. The formula for mass-energy conversion, the theory of ruler contraction and clock slowness, and the theory of time reversal, etc., all have the speed of light and its equivalent values. "When we move at a speed close to the speed of light, our ruler will shorten and the clock will slow down," Einstein described for us in the theory of relativity. "When we move at the speed of light, time will no longer flow; and when we start to move at a speed beyond the speed of light, time will flow backwards!"
The constancy of the speed of light and the inability to break through the speed of light are the cornerstones of the theory of relativity, so the theory of relativity itself denies the possibility of time and space travel.
If you travel at a speed close to the speed of light, then as the speed increases, the closer you get to the speed of light, the more time you multiply. When you travel at 0.99 times the speed of light, time will pass seven times slower, and at 0.9999 times the speed of light, time will pass 70 times slower, and when you reach the speed of light, time will approach 0. However, no object with mass can reach the speed of light, because the effect of the mass increase effect will make the mass of the object infinite. Obviously, infinity does not exist.
The same is true when you are in a strong gravitational field. Einstein's general relativity tells us that gravity is actually the curvature of spacetime caused by mass. The stronger the gravity, the more significant the curvature of spacetime will be, and the slower the speed of time will pass.
This phenomenon has now been verified through experiments and observations: for example, GPS satellite positioning, we know that the gravity on the surface of the earth is stronger than the gravity in high-altitude orbit, which means that time on the surface of the earth passes slower than in orbit. And this effect must be corrected by the time dilation formula, otherwise the positioning will be wrong.
In "Stargate - The Principle of Superluminal Spacecraft", it is believed that whether it is material or information signal transmission, it is a form of energy transmission. Information transmitted from the future, whether it is in the form of electromagnetic waves or gravitational waves, in the universe, any matter can be regarded as a form of energy. Therefore, in a certain range of unknown areas, early warning or dreaming of future scenes is a simple time-space shuttle. And these, we mentioned in the book that in the evolution of the universe, there may be an energy set that has not been converted into particles. In quantum mechanics, vacuum is defined as a 0 energy state. Relatively speaking, it can be considered that it is a carrier without any kinetic energy and time. Therefore, it can correspond to countless time sets of the evolution of the universe. Maybe for dozens or hundreds of years, the vacuum will not change, but the visible stars in the universe are constantly evolving and time is constantly flowing. Therefore, we can happily see that through the vacuum 0 energy state and 0 time state, we can travel through different time and space sets. At least, the human brain sometimes does it unintentionally. This is an indisputable fact.