The speed of light in a medium is less than the speed of light in a vacuum, and particles may travel faster in a medium than the speed of light in a medium. Radiation occurs in this case, known as the Cherenkov effect. This is not the speed of light in the true sense of the word, which is more than the speed of light in a vacuum.

If A is moving east with respect to C at a velocity of 0.6c, B is moving west with respect to C at a velocity of 0.6c.

For C, the distance between A and B increases at a rate of 1.2c. This "speed" ...... The velocity between two moving objects relative to the third observer can exceed the speed of light.

But the speed of the two objects relative to each other does not exceed the speed of light, in this example, the velocity of B in the coordinate system of A is 0.88c, and the velocity of A in the coordinate system of B is also 0.88c.

Shake your hand under the lamp and you will find that the shadow is faster than the speed of the hand, and the ratio of the shadow to the speed of the hand shaking is equal to the ratio of their distance from the lamp. If you shake your flashlight towards the moon, you can easily make the spot that falls on the moon move faster than the speed of light. Unfortunately, information cannot be transmitted faster than the speed of light in this way.

The ratio of the shadow to the speed of the shaking of the hand is indeed equal to the ratio of their distance to the light, but the maximum speed of the shadow does not exceed the speed of light, and the same goes for the light spot.

Suppose there is a slope with an elevation angle of 60 degrees, and an object moves horizontally at a speed of 0.6c, then theoretically the projected speed on the slope is 1.2c, and in fact the maximum velocity of the shadow is c.

When you hit one end of a stick, will the vibrations immediately spread to the other? Wouldn't this provide a faster-than-light means of communication? Unfortunately, the ideal rigid body does not exist zài, and the propagation of vibrations in the stick takes place at the speed of sound, which is ultimately the result of electromagnetic action, so it cannot exceed the speed of light.

An interesting question, carrying the upper end of a stick vertically and suddenly letting go, is the upper end of the stick starting to fall first or the lower end of the stick starting to fall first? The answer is the upper end.

The speed at which gravity propagates is the speed of light, and in the theory of relativity, the existence of gravity is only a consequence of the bending of space-time, not a force of actual existence, and this "consequence" travels at the speed of light.

It is possible for galaxies moving towards us to have an apparent speed exceeding the speed of light. This is an illusion, because there is no correction for the reduction in time from the galaxy to us.

Here's an example: If we measure a galaxy ten light-years away from us, it will move at a speed of two-thirds c.

Now it is measured at a distance of 30 light-years, because when it emits light, the galaxy is exactly 10 light-years away

Three years later, the galaxy is at eight light-years, and the apparent distance is three times that of eight light-years, or twenty-four light-years. As a result, the apparent distance decreased by six light-years over three years......

In quantum field theory, force is transmitted through virtual particles. Due to Heisenberg's uncertainty, these virtual particles can travel faster than light, but virtual particles are only mathematical symbols, and faster-than-light travel or communication still do not exist.

In fact, many phenomena such as pulsars, which travel faster than the speed of light, are not rotational. From our frame of reference, the higher the pulsar frequency, the smaller its speed beyond the speed of light, the lower the pulsar frequency, the greater its speed beyond the speed of light, and a black hole is a star with a speed exactly equal to the speed of light.

"Is it really faster-than-light? But who is sure that there are four best in the Milky Way? Prism touched his chin and asked, this was something he couldn't figure out.

"I don't know, maybe it's that person, maybe it's someone else, anyway, it's not because of adults." Hua Zhongyue explained.

"Well, I can't help but want to go and see it." With that, Prism quickly walked out of the villa where he was and went to a small house in the manor.

What people didn't expect was that although this house was small, the mechanism was really not small. Prism directly opened a door in this house with only four walls, only to find that this door did not lead to the outside of the Desperate Manor, but to another dimension.

If this small one-story bungalow of only a few dozen square meters has no roof, and another person observes it from above, he will definitely find this scene extremely strange.

For it was only one of the four walls of the small bungalow, and it was only twenty or thirty centimeters thick, and the door that could be opened from the house did not lead to the outside of the desperate manor.

Even Prism was a little surprised to think of this, because he saw that inside the open door there were long stairs leading to the unknown depths of the earth.

This is Ingson's underground laboratory? It's really extraordinary. It's just a small house, and it has opened up such a huge space.

From the staircase in front of him, which is not in sight, Flying Prism can make the least calculations. The space here is very large, and it looks like it won't be less than half the area of a desperate manor, but where is this space actually located?

Prism thought about a lot of questions, and then walked down the long staircase step by step.

The stairs are very clean, and they are made of a material that is not visible from the flying stars. There doesn't seem to be any dust, and there is no quaint smell to be seen. On the contrary, it is smooth and can even reflect the shape of a flying star like a mirror.

But what makes people feel amazing is that the friction of such a smooth step should be very small. But the feeling for Flying Star was the opposite, he felt that the friction of this ladder was very large.

No matter how his standing feet slid against the ground, it was always difficult to draw a distance, as if he had been stuck in glue. And lifting your feet, but with ease, is a wonderful phenomenon that gives people an indescribable feeling.

After walking for a while, Flying Star also found that it was surprisingly quiet here, and he walked on the stairs without a single echo, especially when he walked with a lot of strength, and in the end he deliberately stepped on it hard.

But even so, there was still not a single sound coming from here, as if he had fallen into a silent space, and the scene seemed extremely strange.

If the stairs that Flying Prism walked on were made of sponges, he wouldn't think much about it, but the stairs here were obviously made of unknown stone materials, and they couldn't even make a sound, and they didn't know how many times better than any muffler.

Moreover, even if it is a staircase made of sponge, it will definitely make a sound under heavy trampling, but there is really no sound here, and it is as silent as death.

This book was first published from 17K Novel Network, the first time to see the genuine content! R405