How can you turn back time? Is there any way to turn back time?

According to "Life Science" **March 7**, for many years, people have been hoping to see their deceased relatives through time travel, or change some major disasters that have occurred in history. So, is it feasible to go back in time? Some scientists believe that it cannot be done, at least for now.

Time lapse is based on four-dimensional space-time When discussing time rewind, we have to mention four-dimensional space. Space is made up of three dimensions: length, width, and height, and as we move from one place to another, our coordinates in three-dimensional space also change. But what is imperceptible is that we are also quietly moving forward in the dimension of time.

Charles Liu, an astrophysicist at the City University of New York, said that time and space combine to form a four-dimensional space-time, and can be seen as a four-dimensional organic fiber cloth. When an object with mass, such as a person, object, or star, is placed on this cloth, folds form on it. This fold is a space-time bend to accommodate that mass.

Two theories of time rewind Brian Green, a physicist at Columbia University and author of the book "The Perfect Universe", said that there are many theoretical models of time rewind in the scientific community, but most of them do not conform to the principles of physics. The most mature theory is called the "wormhole theory". A wormhole is an imaginary passage that connects two regions of space-time, either in two different universes or in two parts of the same universe.

Objects can travel through wormholes. Mitchio Kaku, a physicist at the City University of New York, said that wormholes can lead to the future as well as to the past, but such a theory requires far more energy than can be obtained with today's technology. This energy is equivalent to the total energy contained in a star, and even the theoretical "negative energy" is required.

Another popular theory is called the "cosmic string". The theory is that the early universe left a narrow energy pipeline that stretched the entire length of the universe. This area is home to supermassive matter that can distort the surrounding space-time.

Richard Gott, a professor at Princeton University, said that the cosmic strings are infinitely long or closed, and if the two cosmic strings were to be put together, space-time would be distorted in a huge way, possibly turning back time. However, this theory also requires a huge amount of energy to support. Scientists say that while it is mathematically possible to turn back the clock, no solution is feasible at the moment and requires far more technology than humanity has today.

However, scientists believe that it is very likely that humans will one day invent a time machine based on a new theory. Resources.

You are a more realistic person in life, but sometimes you also want to fantasize about beautiful things. You should be a Pisces girl, and you will think that what is suitable for a relationship is not necessarily suitable for a husband. You are a two-faced person.

Thinking is never the same as doing. So if you want to go back in time, go fantasizing! Or just try to find something from the past and believe you can.

Because you can't forget.

It's impossible to turn back time, but as long as you cherish the present and cherish everything around you, you don't need time to turn back, because you think you've done it perfectly!

Passing through your future and future time ahead of time is just a short life, and even if you turn back the time, you may not be able to live the way you want to live.

This is a very esoteric question.

First, to determine the properties of the answer, does it need to be theoretically feasible or practical?

If it were theoretically possible, time could be turned back, provided that you had enough lifespans for a tool faster than the speed of light to appear in the world.

From a practical point of view, there is no way to achieve this, or there is no way for humans to experience turning back time, because even if tools appear faster than the speed of light, human beings will be reduced to fragments in the process of faster than the speed of light.

The meaning of going back in time is generally to travel to the past and change some things, so it has a strong purpose and a clear expectation of benefits. Again, this needs to be done with tools that exceed the speed of light.

But there will be a problem here, when time is going backwards, defined as all matter is going backwards, and obscuring can go back to the past, even if we don't discuss the factors that can change the past, there will be another problem at the same time, that is, whether the tool that exceeds the speed of light will also regress from a tool to a bunch of unassembled parts, and then to a bunch of elements in the process of regressing time, so that it is a complete time regression, and the rewind of time should be oriented to the matter that affects all the four-dimensional environments. There is no such thing as everything going backwards and the time machine is getting old.

Technology has not yet been able to solve this problem.

Secondly, it depends on whether your question is necessary, such as going back in time, whether it is beneficial to human beings, and whether it is in line with the cost.

If there is a tool that exceeds the speed of light, it is generally used for interstellar travel, but in fact, star travel does not necessarily have to reach the speed of light technically, but can be assisted by a black hole to exceed the speed of light, or even the speed of light does not need time, because the black hole may be a shortcut, the shortcut means that even if you run 1000 meters from 60 seconds to 30 seconds, you need to complete a full 1000 meters, this is a stupid method, but a black hole can provide a shortcut of 10 meters, You may walk slowly 10 meters from the starting point to reach the end of the 1000 meters.

Therefore, the premise of going back in time - beyond the speed of light, is currently intended to be achieved theoretically, after a long period of development, but it does not necessarily need to appear, and if it appears, it may not achieve the desired result, and the cost is very high.

So the subject should go to bed early and get up early.

There are two ways to do this:

1. Dreaming, in which you can go back to the past.

2. According to the theory of relativity, when your speed of motion is equal to the speed of light, you can stop time, and if you are greater than the speed of light, you can go back in time.

There was once a love in front of me that I didn't cherish, if I could turn back time, I would say to that girl I love you, the period is 10,000 years. But there is no regret medicine in the world.

Yes, when you can accelerate the speed of space by more than light-years, you can turn back time, but then you may also become micromolecules.

Sorry, no!

Because you use the hypothetical method, if there is a time-lapse method, then in 1000 years someone will come back and say hello to you, such as your grandson's grandson. The grandson will come back to see you and take a picture with you. And send you a robot cat to play with you.

But in fact there is none.

Then conclusions can be drawn. Time cannot be turned back. Or that there can't be such a thing as a time machine.

There is no way but to cherish time.

Sleep can make your dreams come true.

I want to think about this question... Dream!

I want to go back to 2017.

I used to have a very good friend, she is a very lively and lovely girl, but in the middle of the night she thinks a lot, a very emotional girl. At that time, the classmates in the class said that I looked very similar to her, we were so good that we bought the same clothes and shoes, bought the same bicycle despite the opposition of our parents, went to educational institutions to distribute flyers to earn money, secretly bought tickets to Shenyang together, went to people's fitting rooms to try on clothes and take crazy pictures, and did crazy things together, one of which was that we cut our ultra-short hair together at the beginning of the first semester of the second year of high school, which was very short and short, which surprised many students.

It's really crazy, and later, she broke up with her boyfriend, and she was in a bad mood, and finally one day we had a big fight over a little thing, and our relationship has gone downhill since then, and slowly we separated, no longer wearing the same clothes, no longer talking to each other easily, like half a stranger, it's a strange thing, it's a pity.

I often pay attention to her, I can feel that she also often pays attention to me, but I can never go back to the past, just last month, I also met her on the train, she now has a friend in college who loves her very much, they are very happy, but we talked a few words, I walked out of the carriage, I couldn't stay any longer, until I got off the train, I have been standing in the smoking place, and when I got off the train, I didn't even say a word of Qingqing goodbye, I was afraid, I was afraid that we would have to carry our luggage all the time, The awkward look of not knowing what to say replayed over and over again in my mind, and I chose not to say goodbye to it.

As for why go back to 17 years, because in the next few years, I have learned a cautious and hidden truth, if you really want to be friends with a person, you have to be a long stream, you can't pour all your sense of humor into the same person in a very short period of time, in this way, you haven't gained new growth, and the two will have no gaps, just like two trains meet, the closer the faster, but there is a force to push the two outward, to keep a friend you have to leave space, seek common ground while reserving differences, I also met a friend I like very much in college, She is very similar to her, very emotional, likes to think a lot, this time I choose to leave room for me, I am not far from her and not close, maybe not to be the so-called best friend so that I will not be the first to separate.