What are the phenomena that occur when an object moves faster than the speed of light?

For now, this is an unknown problem, I have also checked the relevant information, in the universe is not an object with superluminal motion, it seems to be called tachyon, which will appear in supernova**, but the so-called time rewind is not a real rewind, but the internal state of the object is in a situation similar to the replay, from our point of view, time is still going on, just like watching the replay clip. You must know that time is also a kind of energy, and from the perspective of four-dimensional space, if an object turns back time, then it will be immediately excluded from this universe, of course, this is only theoretical, and the current level of science and technology is only limited to theory, so if you want to really want to explore it yourself.

At the speed of light, mass will change, and the special theory of relativity that the friends upstairs can explain this, in fact, Einstein proved that time cannot be reversed, although it is a pity, but we have to respect science, when the light is absorbed by the black hole and cannot escape, it may be able to go back to the past, which is also our thought, hehe, thank you.

Einstein's theory of relativity states that the speed of light is the upper limit of the cosmic velocity, i.e. no object can exceed the speed of light. In modern times, many scholars have put forward hypotheses about the superluminal speed of objects, and through the calculation of many formulas and research experiments, they finally came to the same conclusion.

The entire energy of a resting object is contained in the mass at rest. Once in motion, kinetic energy is generated. Since mass and energy are equivalent, the energy present in motion should be added to the mass, that is, the mass of the moving object increases.

When the speed of the object is much lower than the speed of light, the increase in mass is negligible, as when the speed reaches the speed of light, the mass only increases, but as the speed approaches the speed of light, the increased mass is significant. For example, when the speed reaches the speed of light, its mass more than doubles. At this point, more energy is required for the object to continue accelerating.

When the velocity approaches the speed of light, the mass rises in a straight line as the velocity increases, and when the velocity is infinitely close to the speed of light, the mass tends to infinity, requiring an infinite amount of energy. Therefore, it is impossible for any object to move at the speed of light, and only particles with zero mass can move at the speed of light, like photons.

First of all, the argument that an object cannot travel faster than the speed of light is a question worth pondering. Personally, I think the accurate expression should be in the currently known objects, whose velocity cannot exceed the speed of light. Because light is the premise that we can see objects, we can only discover objects whether the light is reflected from the object, emitted, and then reaches our naked eye or a known detection instrument.

Light is the fastest matter we currently know and the basis for our ability to see objects moving at the speed of light. So it is absolutely impossible for the speed of all known objects to exceed the speed of light, because once we exceed them, we will not be able to see them.

Second, let's assume that there really is a knowledgeable object that can travel faster than the speed of light, which means that it is impossible for light to hit the object at this time. Because the speed of light is not large enough, the object cannot be seen. According to the current logical reasoning.

A snail, no matter how it moves, can never travel faster than the speed of light, which is related to the nature of its own motion.

The speed of sound cannot exceed the speed of light.

What object cannot move faster than the speed of light, and it is impossible for any object to move at the speed of light.

Only particles with zero mass can move at the speed of light, like photons.