About the feasibility of going back in time or time travel

At present, the most authoritative theoretical basis for time and space travel is the general theory of relativity proposed by Einstein, and then Hawking pointed out that theoretically, time tunnels or "wormholes" can not only take humans to other planets, if the two ends of the wormhole are in the same place, and separated by time rather than distance, then the spacecraft can fly in, and after flying out, it is still close to the earth, but into the so-called "distant past". Because in a 4-degree space, 10 minutes might be n hours. This is the basis of the current human theory of going back in time, or time travel.

Possibility: According to the above theory, the following conditions should be met in order to go back in time or travel through time and space: 1. There is faster-than-light flight equipment; 2. Equipment that can make a strong gravitational force (large enough to make a volume as large as an egg, but extremely dense, and weighs at least 1 earth); With these two devices, the next step of research and exploration can be carried out.

If only theoretically feasible.

Regression has a famous grandmother paradox, so if you can go back in time, you can only look at the past and not change it.

Time and space travel may be the most popular is the wormhole, right, this is based on the existing universe form, some famous hypotheses about the shape of time and space, I may not be accurate to say this, because I can't remember clearly, but Du Niang will know the wormhole.

Since I was a child, I have been watching about the possibility and inevitability of time travel. Time is inherently defined as the fourth dimension of three-dimensional space. And the direction of the light diverges directly from one point to the surface.

It is also the world we see and see, this second, will be eternally existing in the body of time, and if at some point in the future, we are not sure, when we ride the time machine, we will be able to return to the point before us. In other words, the world is a body formed by the intersection of time-dimensional lines.

For example, it's November 28, 2018, and at this moment, I'm sitting in front of my computer typing and writing articles, and I'm just one of them in the same space, in different spatial dimensions. When I type this word, I may be typing another word in the same time dimension and the same spatial dimension. For example, if I want to hit Zhang San, another time dimension may be playing Zhang Si, another one is playing Zhang Wu, and another is deleting the word "Zhang".

Therefore, from one point to ten thousand time dimensions, an infinite number of possibilities can be derived. In the same way, at this moment, I am digging tongs, typing the word Zhang, the previous word is the word "yes", there may be different people in the time dimension of ten thousand times, I type any word, and then I go to type the word "Zhang". Therefore, we live in the dimension of time, which should be a three-dimensional space where a time sphere and a time sphere are nested with each other.

Therefore, if I have the opportunity to take TimeMachine (TM) back to any of the previous time dimensions on November 28, 2028, I may not be able to return to this point at this moment. So in the future, we may still have a long way to go for the time travel situation. And even if we have TM, we don't necessarily get back to the point we wanted to go back to.

That is, a different "me" is real, and maybe at this time, I am in the same three-beat scattered dimensional space in another time dimension, and I am receiving a return visit from the current line in 2028, who knows?

There is no theoretical basis for the idea of going back in time, some people say that black holes can go back in time, but it is only a conjecture, after all, no one has really touched a black hole. The theory of relativity seems to be able to turn back time, but only if it exceeds the speed of light, which is not currently possible.

Upstairs! Have you tried it?

It's impossible to turn back time!

Only you went to the past time! A sucker!

Time can be turned back, but only if the speed of light is exceeded, looking at the watch will go counterclockwise. And if you get into a spaceship that flies faster than the speed of light, you can see some of the things that happened in history, as if you were traveling through time and space, and you can also see that your watch doesn't go in the same direction, but in the opposite direction. So time can be turned back, or it can travel through time and space.