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Is it really a joke to turn on the flashlight and climb up the light beam?

Turn on the flashlight and climb up along the light beam, which sounds absolutely a joke and goes against common sense. In fact, this is not a joke, but can be realized in reality. In the eyes of ordinary people, light is visible but intangible, and light has no substance. In fact, this is not the case.

In junior high school physics class, we learned that light is a unique existence with wave-particle duality, which means that light is both a wave and a particle.

since it is a particle, it will inevitably produce pressure, that is to say, when we use a flashlight to illuminate a wall, this light beam actually exerts a pressure on the wall like an ordinary wooden stick, and this pressure is called light pressure.

in nature, light pressure is of great significance. If there is no light pressure, then we can't see a comet with a long tail. As we all know, the tail of a comet is gas and dust. Although the light pressure is weak, it can affect small particles of gas molecules. < P > When a comet passes near the sun, the light pressure generated by sunlight will act on these gas molecules, so the tail of a comet appears. So the tail of a comet always faces away from the sun.

don't look at the weak light pressure, which is also important for the existence of stars. We know that when the star runs out of fuel, it will start to collapse and eventually collapse into a black hole. So, do you know why stars collapse when they run out of fuel?

The star collapses because of gravity, and the star itself is a huge luminous body, which will produce a lot of light pressure, and the light pressure will make the star expand, that is, support the star. When the light pressure and gravity reach a balance, the star will stay there,

But when the star's fuel is exhausted and the gravity is greater than the light pressure, it will enter the process of collapse.

In the whole universe, optical pressure is everywhere. Even when we launch a satellite, we must consider the influence of optical pressure, otherwise it will be difficult for the satellite to run smoothly in orbit. Since light can produce pressure, we can also use light pressure. Ashkin, the Nobel Prize winner in 218, invented optical tweezers by using the principle of light pressure. The so-called optical tweezers are tweezers made of light. Simply put, light can be used to pick up some microscopic substances, such as bacteria, viruses and DNA.

In the future, scientists will use light pressure to develop more amazing things, and one day we will be able to pick up large objects with light.

Now you know, since light can be used to pick up things, it is naturally feasible to climb up with the light of a flashlight in theory.

So one day, we can really climb along the light beam. What will happen? If the power is turned off, will we fall down instantly? It shouldn't be like this. In our opinion, the light of a flashlight is static, but it is actually not. The light has been moving at a speed of 3, kilometers per second since the moment it appears, so the light beam we see is actually rising, and we can move up at the speed of light as long as we hold this light beam.

what does this mean? This means that we will have a chance to surpass the speed of light. As long as we continue to climb up on a constantly moving light beam, then we will surpass the speed of light, and then we will travel through time and space. Of course, all this is just our bold imagination, which is impossible in reality.

because from the mass-energy equation, when the moving speed of an object with static mass increases, its mass will increase accordingly. When it reaches the speed of light, its mass will reach infinity.

We can't bear the infinite mass, so when we take this light beam, we will already be infinite.