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<> the speed of time was thought to be fixed before the advent of Einstein's special theory of relativity, and the reason why "time dilation" was not thought of by anyone from Galileo to Newton was because these physicists did not realize that the speed of light is constant in any frame of reference.
In 1887, Michelson Morey's experiments proved that the speed of light is constant, and that the "ether" does not exist. When Einstein realized that traditional classical physics had reached a bottleneck, he boldly abandoned absolute time and absolute space, which had dominated physics for hundreds of years, and instead proposed a special theory of relativity based on relative space and time. <>
The general public is familiar with the special theory of relativity, which starts from the "time dilation effect", in short, the faster the speed of movement, the slower the speed of time passing, many people see these words and take it for granted that reaching the speed of light can make time stand still, and exceeding the speed of light can make time go backwards, this idea is undoubtedly wrong.
Einstein used the principle of invariance of the speed of light to deduce the existence of the time dilation effect, and also obtained the famous mass-energy formula e=mc?, i.e., "the energy possessed by an object is equal to its mass multiplied by the square of the speed of light" <>
where E is the energy possessed by the object, M is the mass of the object, and C is the speed of light in a vacuum, so it can be seen that any gram of matter has its own mass multiplied by the square of the speed of light, and since mass and energy are equivalent, the mass of matter will increase once it moves, but this mass increase can only be measured in the state of near-light speed motion.
Although the mass of an object at twice the speed of light is only nearly twice that of the object at rest, as the impact process towards the speed of light continues, the mass of the object will increase explosively, and the end result of the cycle is that the mass of the object becomes infinite before reaching the speed of light, which requires infinite energy to accelerate it. <>
However, there is no infinite amount of energy in the universe, so it is impossible to accelerate an object with a non-zero mass at rest to the speed of light, and it is naturally impossible for man to build a true light-speed spaceship.
In fact, from a practical point of view, a real light-speed spaceship does not have a big advantage compared with a spaceship that can fly infinitely close to the speed of light, because the time dilation effect produced by infinitely close to the speed of light is enough for a person to reach the destination in a short time, for example, the star ring of the mid-range heart and Ai AA in "The Three-Body Problem" used curvature to drive infinitely close to the speed of light, and finally crossed the distance of light years in 52 hours in the spaceship. <>
In our universe, only photons can reach instantaneously in the true sense, and if the photon has wisdom and feeling, it will find that it will arrive at its destination instantly after its birth, because its own speed reaches the speed of light, and in our view in the state of low-speed motion, photons do not arrive instantly, for example, the sunlight is the sunlight 8 minutes and 30 seconds ago, and Proxima Centauri is the Proxima Centauri a year ago.
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The speed of light is very fast, but the speed of light is not particularly fast in the universe, because the distance from the sun to the earth takes about 8 minutes, naturally it is not reached in an instant, as long as the distance is far enough, the speed of light can also be infinitely reduced, just like we go to a place 500 kilometers away to take a train running at a speed of 100 kilometers per hour.
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Basically, you can feel the arrival instantly, because this speed of light is very fast, and then it is fleeting, and you can feel the intensity of the light in an instant, so that you can predict it in an instant.
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For the speed of people now, the speed of light should really arrive instantaneously, after all, the speed of light is really fast, and basically the human eye cannot distinguish that light is moving.
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I have to say that the propagation speed of light is indeed very fast, when the speed of light is reached, there will be a feeling of instant arrival no matter how far away, and the speed of light is definitely the fastest speed in the world.
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After reaching the speed of light, no matter how far it feels, it feels like it is instantaneous, which means that time stops, and when the speed reaches the speed of light, then it exceeds this speed of light, and time will go back, which also shows that human beings can travel through time and space.
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The speed of light is nearly 300,000 meters per second, there is no so-called instant, nothing is just emitted, because the photons in the light have no mass, and there is no acceleration process for things without mass, and it is nearly 300,000 per second from the beginning of its generationWe can't use our existing understanding of time to calculate its time, a moment or a second, or a millisecond. <>
What is the concept of instant, our understanding in real life is a very short time, this is a general understanding, but from the understanding of Buddhism, like a moment and a moment, this is corresponding to a certain unit conversion, just to say that his time is very short does not mean that he does not, but as long as it has time, he cannot be used to describe the speed of light, light does not have an instant, because light from the generation of photons, his normal speed is nearly 300,000 meters,Every second he is not affected by other external substances, and his speed does not increase or decrease, it is an eternal and unchanging speed. <>
Some people may also put forward a new proposition, something similar to a paradox, asking whether the light emitted by the car lights is light, whether the speed of this light is 300,000 meters per second, we are taking such a constraint, and the specific is not so fast and a little worse, then when my car maintains a speed of 60 kilometers per hour, it is not the light emitted by the headlights of my car, and its speed exceeds 300,000 meters per secondBecause the speed of light mentioned above is eternal, he will not change his speed because you exert a forward force on him. <>
No one can lower the speed of light, and no one can increase the speed of light, otherwise why would it be eternal? How did the concept of the light-speed light-year come about? Light-year means the time that light has traveled through a year.
The distance he traveled, because that distance was very long, became a unit of distance, because the speed of light was not affected by external matter, and if this speed was affected by external matter, it was a unit of distanceThen the light year would not be a unit of distance, because the concept of a unit of distance means that there must be a standard definition.
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In an instant, the light is moved by the extremely high-speed vibration of the photons at the moment it is generated, and its speed is 300,000 kilometers in an instant, and there is no need to accelerate.
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The speed of light reaches 300,000 kilometers instantly, because the speed of light is very fast, so we can't experience the acceleration process at all, and we can't feel any information.
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The speed of light is 300,000 kilometers in an instant. There is no need for an acceleration process, it will always be 300,000 kilometers.
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We have known light since the first day we came into this world and opened our eyes. There is an idiom called turning a blind eye to the fact that we have never taken the nature of light seriously.
Through experiments, scientists know that the speed of light reaches 300,000 dry meters per second, which can only be a probability. In various experiments, I also learned about the particle nature and wave nature of light, and from the seven chin colors of white light, I learned that each color of light has different wavelengths. During the solar eclipse, astronomers observed the stars behind the sun and knew that light bends under the action of the gravitational field, which means that light has almost negligible mass, and that light has pressure.
We also know that light can carry and transmit energy, including information that we know and don't know! Our understanding of light is at best a drop in the bucket so far. So it's still too early for us to say that light is the fastest messenger in the universe, that the speed of light is constant, and so on!
In my personal opinion, the speed of light is by no means constant in terms of the particle nature of light that can carry energy and information. In terms of its volatility, light does not necessarily have only one form. Just as our ancestors only knew that water was a liquid before they knew about water vapor and ice and snow, who would dare to say that light does not exist in many forms?
Maybe a few years later, our descendants will drive a spaceship made of solid light, use metallic hydrogen and antimetallic hydrogen energy exchange as power, open a corner of the universe as a wormhole at will, and travel between white and black holes at will, building a magpie bridge between the Milky Way and the Andromeda Nebula, so that tens of millions of voids and trillions of worlds will no longer be desolate. Do you say okay?
In short, if a photon has an acceleration process, there is no guarantee that the speed of light will not change! Who will give it acceleration, give it recoil. Of course, it is a light source, and if the light source can accelerate the photon, the speed of the light source itself will be superimposed on the photon.
This is not in line with actual observations! My understanding is that any direction of space is filled with virtual photons that travel at the speed of light (that is, ground-state photons with no frequency polarization and no energy fluctuations), and the light source, that is, the electric charge, only modulates the energy information such as frequency fluctuation and polarization to the virtual photons passing by it.
To change from the ground state to the excited state, just as the radio station modulates the sound and image information to the radio waves, the photons themselves are also modulated. The absorption of photons is a demodulation process. So the speed of the light source does not affect the speed of light, and the photons do not accelerate the deceleration process.
The universe has been the speed of light since its inception.
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The stationary mass of light is zero, how to accelerate!
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It should not require an acceleration process, the speed of light can reach 300,000 kilometers in an instant, which is really amazing, we can't imagine it.
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Yes, because the speed of light is very fast. Yes, but its acceleration is so fast that we can barely see it.
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Yes, it reaches 300,000 kilometers in an instant, and there is no need for an acceleration process in between, which is a natural property of photons.
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When we are in a hurry, we will find ourselves very eager to get to our destination immediately, so that we don't have to rush anythingIn response to this problem, some people think of the speed of light and think that the speed of light can reach the destination instantly, so the question is, when people fly at the speed of light, no matter how far they travel, is it instantaneous? The answer, of course, is yes, knowing that the speed of light is very fast.
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Yes. According to the theory, time will stand still at the speed of light, so no matter how far away it is, it will be instantaneous for humans.
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Even if a person flies at the speed of light, not all distances can be reached instantaneously, and if the distance is very far, there is no way to reach it instantly, otherwise the word light year would not appear.
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No, the speed of light is not infinitely fast, and it also requires a certain amount of flight time.
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