We often say: time is in a hurry, past will not come back, and what will happen in the future, everything is possible. This is actually telling us that time is irreversible. At the same time, we can’t go to the future. We don’t know what will happen in the future.
However, the emergence of science tells people that everything has no absolute, and time is the same. When you think time is irreversible or time can not be seen in advance, time travel may become a trend in the future. So can time travel really be realized? In fact, human beings have been engaged in time travel for a long time.
Now there are many time-space novels on the Internet. The protagonist unexpectedly goes back to the past and just went to school. From then on, the protagonist, relying on the prophet of future events, starts a brilliant life, stands at the top of the world, marries Bai Fumei and lives a life envied by countless people. I believe everyone hopes to go back to the past and realize the regret left behind by the completion.
So is it possible to go back to the past? It’s hard to say now, but in physics, going to the future is possible. According to Einstein’s theory of relativity, space-time is not absolute, but the speed of light is constant. Its speed in vacuum is always 300000 kilometers per second. When the speed of physical motion is accelerating, the time of the object is also slowing down. When the speed of the object is close to the speed of light, time is also close to stagnation. When the speed of the object reaches the speed of light, time stops.
According to Einstein’s theory of relativity, it’s not complicated to go to the future. As long as you can travel at the speed of light in a spaceship, you can go to the future. For example, you take a light speed spaceship to a planet that is 100 light-years away, then return to earth after reaching the target, and travel 200 light-years to the spaceship. From the perspective of the earth, when you return to the earth, the earth has been 200 years, and people also know that you left the earth for 200 years.
But for you sitting in the spaceship, you may just feel that it has not been long, it may only be a few minutes, and you are not as old as 200 years ago, or as young as 200 years ago. Is that the equivalent of going to the future. It is the use of the speed of light flying objects, the basic principle of time stagnation. If you want to go to the future 1000 years later, you can go to a target 500 light years away in a light speed spaceship in two ways. If you reach the target and come back, the earth will have passed 1000 years.
This object that flies at the speed of light makes the speed of time very obvious, and people can clearly feel that they have reached the future. But in fact, human beings are already on time travel. Why? Let’s take astronauts as an example. At present, Gennadi Padalka, a Russian, has the longest stay in outer space, with a total stay of 879 days on the international space station. After two and a half years of high-speed space flight, Padalka has been 1 / 44 second younger than her peers on earth. That is to say, he has reached the future in 1 / 44 second.
This is because the speed of the spacecraft orbiting the earth is very fast, but it is far from the speed of light. At present, human beings can see the speed close to the speed of light, which can only be seen in the Large Hadron collision experiment. It can accelerate protons to 99.999% of the speed of light, infinitely close to the speed of light. Compared with the static observer, the time of these protons is about 6900 times slower! In a sense, human beings are launching subatomic particles into the future!
In addition to astronauts can travel time, but for ordinary people can also realize that, for example, people living in low-rise buildings, the time is slower than people upstairs, of course, the time difference is very small, we can not feel the difference between the time upstairs and downstairs, in our sense, their time is the same.
Time travel is a common phenomenon in our daily life, but the time difference is so small that we can’t feel through the future. Ordinary scientists have put forward a way to enable human beings to go to the future. Scientists may not be able to realize the speed of light flight technology for a long time in the future, but there is a way to accelerate the spacecraft to near the speed of light in the universe.
This way is to go to the orbit of the black hole. We know that the black hole is the object with the largest known gravity. Its super strong gravity distorts the space at the orbit of the black hole, and the orbit outside the black hole can rotate at a high speed, which is infinitely close to the speed of light. We can make the spaceship close to the black hole, and then let the spaceship run along the black hole orbit, so that the spaceship can run close to the speed of light driven by the high-speed operation of the black hole orbit. This also allows the spacecraft to achieve near the speed of light. After flying for a period of time and then leaving the orbit of the black hole, we can return to the earth. The earth has passed many years, maybe decades, maybe hundreds of years, thousands of years.
In fact, this method is the same as the spaceship flying at the speed of light to the target and then back to the earth. Both of them make use of the principle that the object flying at the speed of light will slow down infinitely. Of course, these two methods are very difficult to implement. The first method requires human beings to develop the technology of light speed flight. The second method does not require human beings to develop the technology of light speed flight, but it needs to develop the method of how to resist the gravity of the black hole. Otherwise, once the spacecraft gets close to the black hole, it will be pulled into the black hole by the strong gravity of the black hole, and it will not be stable in the orbit of the black hole.
From this point of view, as long as the speed of light technology can be realized, it is possible to go to the future. So does going beyond the speed of light mean going back in time? If theoretically, the speed of light of an object can stop time, does flying beyond the speed of light mean that time can be reversed? Theoretically, it is true, which is why some scientists think it is possible to go back to the past in the future.
However, superluminal flight is far beyond the understanding of human physics. It is the limit that the speed of light can be reached only by the motion speed of the object itself. To break through the speed of light, we may need to find another way to study it from the more mysterious wormhole theory and black hole theory. However, with the continuous progress of science and technology, the road of science is full of unknowns, and the power of science is endless. Anything that is considered impossible now is likely to be realized in the future. Time travel is too remote and mysterious for modern science, but who can guarantee that it will not be realized in the future. Ten thousand years ago, human beings would not believe that now human beings can go out of the earth to explore the universe, and everything is possible in the future.
Guys, what do you think of time travel? Welcome to leave a message below to discuss and express your own opinions and unique views.