Going beyond the speed of light, going back in time, is there a contradiction between this and the t

Beyond the speed of light, you can't go back to the past, and wormholes can only make spatial jumps.

Time is divided into the absolute time of objective existence and the relative time of subjective sensation. Absolute time is a one-way axis that cannot be reversed or stagnant. The relative time is very arbitrary, it can be both positive flow, stop, and reverse flow.

The movement of an object close to the speed of light will produce the effects of "bell slowness" and "ruler contraction", the effect of "bell stopping" and "ruler elimination" will occur when moving at the speed of light, and the effect of "bell inversion" and "ruler expansion" will occur when moving faster than the speed of light.

If you move close to the speed of light, the light will catch up with you very slowly, and you will feel as if time has slowed down, but this is only your relative time has slowed down, and the absolute time outside has not slowed down.

If you move at the speed of light, you will always see the light of a moment, and it feels as if time has stopped, but this is only your own relative time has stopped, and the absolute time in the outside world still passes as usual.

If you move faster than the speed of light, you can catch up with the light that was emitted before, so that you can see what was before, and it feels like time has gone backwards, and it is only your relative time that has been reversed, and the absolute time of the outside world has not changed.

If you see the past through faster-than-light motion, it's just seeing the past, not going back to the past, and we can't change everything we saw before. The universe you are in at this time is also the universe you were in, not the universe you see now.

I'm afraid you don't understand what you mean by "going back in time".

This is not to say that we have really returned to history in time, we have just run in front of the light, and we have only "seen" what happened in the past, but we cannot "change" the past. From the point of view of time, you change your relative time, and do not affect the actual universe.

Highlight two mistakes in your question:

First of all, the big ** theory is predicted by the general theory of relativity, but the general theory of relativity does not allow the existence of excessive information dissemination and does not allow "going back to the past". So your question is pointless.

Second, the theory of the universe was not proposed by Hawking, on the contrary, Hawking opposed this theory. Because this theory does not take into account the uncertainty principle of quantum theory.

The Earth is still orbiting, and as you said, wouldn't it be a spacewalk six months ago?

Friends on the second floor, you said it very well, admire.

Because this is the expansion of the universe itself, and the speed of light is only the upper limit of the speed of all matter in the universe. To put it bluntly, it means that the speed of expansion of the universe will not be constrained by the law that "the speed of light is insurmountable". We all know that the vastness of the universe, its many mysteries, and countless unknowns have been one of the themes that many human scientists have been tirelessly exploring so far.

The emergence of the famous physicist Albert Einstein in the last century brought us three important theories of physics: special relativity, general relativity, and quantum mechanics. In particular, the two systems of relativity have led our scientific development for decades, and their importance is self-evident.

The biggest cornerstone of the theory of relativity is the so-called principle that "the speed of light is insurmountable". To put it bluntly, the speed of light is the upper limit of the speed of any object in the universe, and only microparticles that do not have mass and have infinite kinetic energy when traveling in a vacuum can reach the speed of light;

It is impossible for any other object to cross the threshold of 300,000 kilometers per second. This has become a universal golden rule; However, the big ** theory of general relativity reveals the fact of "the expansion of the universe";

From the primordial gravitational wave signals we detected at the end of the last century, we discovered another astonishing fact: the universe is expanding faster than the speed of light. Moreover, the data shows that it is at least three or four times faster. What does this mean? Is the theory of relativity being subverted?

Of course not. "Cosmic expansion" is the continuous expansion of the space-time of the universe itself; It's not just speed. To put it bluntly, it doesn't follow any of the existing laws of physics at all.

Therefore, it is understandable that the universe is expanding faster than the speed of light. It is worth mentioning that it was precisely because of the inspiration that the universe expands faster than the speed of light that NASA proposed the idea of the so-called "curvature engine" migration technology in 2012;

It is said that this technology can make the spacecraft faster than the speed of light by folding space.

Because the speed at which the universe expands is relative, and the speed of light is absolute, the universe will expand faster than the speed of light.

Strictly speaking, the speed at which the universe expands is not the speed in the true sense of the word. As the universe expands, light also spreads, and the speed of light plus an expansion speed will make the universe expand faster than light.

Because the speed of light is limited to objects in the solar system, and from the perspective of the universe, it may be surpassable, and I think there are many mysteries in the universe.