The secret of time

Thunder to rain Leo ~ rain to fight Umbrella Leo ~ ~ ~ Everyone has seen thunder? So when you thunder, do you first see lightning or hear thunder first? Must be lightning. . . Looks like there is no doubt at all. When you are racing in a hundred meters, do you first see the light coming out of the muzzle or the first shot? The amount of this is still used to ask, must first see the light. Why? Because light runs faster than sound.

Yes, light runs faster than sound. Light and sound have many similarities in nature. If you want to clear the light, start with the sound. We all know that if two people are far away, you can obviously feel the delay of the sound. Standing on the mountain and shouting at the open forest, you will hear the echoes coming and going. It is because of the distance that our body's sensory organs can perceive this difference. The speed of sound is 340m / s, for the speed of light, this is simply a hair, the speed of light is an elephant, the speed of sound is simply an ant, it is the speed of light is too fast, we may not feel that he is actually the same as the sound - There is a delay. This phenomenon is hard to detect on Earth, but what if the distance is longer? Put it in the universe? Maybe you will get a lot of unimaginable facts. The truth is that it really exists. Here are a few heavy inferences that will subvert your worldview. . .

Inference 1 A lot of what you see has disappeared

I said this is of course not to say that you are watching people or things that have disappeared on the TV. Give a particularly obvious example. The beautiful sunset we see every day, dyed half of the sky into an intoxicating burgundy. Aside from the refraction factor of the light, the actual sun went down seven or eight minutes ago. So when the sun suddenly disappears at some point in the day, you can still enjoy the sun for eight minutes.

Looking up at the stars and the night sky, you have also thought that many of them have long since disappeared. What you see is nothing but the afterimages left by billions and billions of light years. Scientists are studying the world based on the residual images of these galaxies that remain in the universe, in order to have conjectures similar to the universe, in fact, they are watching the most ambitious movies in the sky. . . This may be the reason why I don't really believe in the constellation. It is a sadness to freeze your character's future in a place that may not exist at all.

Inference 2 Want to go back to the past? Easy to handle

We have been studying history, studying who is good and who is bad, and I don’t know how many facts have been attached to heroism and various prejudices. The best way to study the past is to go back to the past. Although you can't come to the scene, you can see what happened. As mentioned in the above inference, we can imagine that if there is a planet that can observe the earth at a distance of hundreds of light years from the earth, if you have an extremely precise astronomical telescope, then you will earn You can see what happened on Earth hundreds of thousands of years ago. You can still see the arrogant self of ignorance in the past.

Inference 3, a second makes you feel the theory of relativity

We listen to people every day and listen to beautiful music, because the sound loads a lot of information. The same light is also a carrier of great information, or how can we see so many things. Now people are also studying the use of lights to do WIFI, is it cool? The amount seems to be digressing, returning to the text.

Suppose we are leaving the Earth in parallel with the space shuttle and the light. What can we feel? Do you know that the sound has a Doppler effect? It was driving across a motorcycle across the road and driving towards you. . . First you have to avoid haha, then you will find that when he is close to you, the sound is higher than the normal tone, and when you are away from you, it is lower than the normal tone. This is the Doppler effect. It turns out that there is also a Doppler effect in the electromagnetic wave, and light is the electromagnetic wave. So you can think about it, because you and the light are moving in one direction, is the light entering your eyes slowing down? Then, do you see things happening on the earth slow down? What if you are riding a space shuttle at the speed of light? Obviously everything you see on Earth has stopped! ! ! This is the theory of relativity of my supreme idol Einstein. There is also a lot of interesting theory in relativity. The volume of objects moving at the speed of light will change, and the time will be static, all kinds of wonderful.