It takes 8 minutes to reach the earth when it comes to the earth. What if the sun is generated?Over 5 million years

How long does it take for sunlight to reach the earth?

In 8 minutes, this may be common sense that elementary school students know, because the average distance between the sun and the earth is about 149.6 million kilometers, and the speed of light is 299792458 meters per second, so it takes almost 8 minutes to calculate it. In other words, the sun we see at this moment is actually the sun 8 minutes ago. If the sun goes off at this time, then we also need 8 minutes to detect it. It takes 8 minutes to reach the earth when the sun is reaching the earth. These 8 minutes are calculated according to the time on the surface of the sun to the earth. How long does it take to come to the earth if it starts from the sunlight? This time is long. Where does the sun come from? From the core of the sun, because the core of the sun has enough pressure and temperature to induce hydrogenation.

The sun is a huge star with a radius of 69,5500 kilometers, but for photons, this radius is not very large. It does not need 3 seconds to run out, but the problem is not so simple.

The photons born in the core of the sun cannot sprint around as unimpractable in the universe near the vacuum. The sun is a star with a density of about 1408 kg per square meter. Come, it will collide with various molecules inside the sun, so it cannot run straight like a beam. It can only spread to the surface of the sun in the form of the Brown movement. How much time spent, we have to start with the Brown Movement itself. The brown movement finger liquid or gas in the gases does not stop randomly.

The discovery of the Brown movement was very early. It began in 1827. It was not a physicist who found this phenomenon, but a British botanist R. Brown.

As a botanist, pollen is his conventional research object. Once, Brown spent spending in the water for observation, and found that an interesting thing was that these spending on the water had been moving in the water. Brown observation was observed. After a long time, the pollen in the water did not stop, so Brown began to think about the reason. Initially, Brown placed the water cup in a closed environment to observe, but the movement still did not stop, so he excluded the cause of "air disturbance". Since it is not the reason for air, it is the reason for the pollen itself. Since the plants have life, the pollen may also have life. Brown conjecture may be an active behavior of pollen.

This time, Brown fired the pollen and sprinkled it into the water again. As a result, the pollen was still moving.

Brown thought that since it was not a problem of pollen, it was something in the water. Yes, there were microorganisms in the water, so Brown sprinkled the pollen into alcohol and kerosene, and the pollen was still moving. This time, Brownmun, in the end he gave a conclusion: "Actives exist in various organic matter and inorganic objects." Translated, this sentence means that life is everywhere, whether alcohol or kerosene and oil There are life in it. Obviously Brown's conclusion is wrong. After nearly a century, people realized the existence of molecules and atoms, and finally revealed the mystery of Brown movement.

Whether it is gas, liquid or solid, all matter consists of molecules or atoms, and molecules and atoms are always in movement.

Since molecules are moving, water is composed of water molecules, so water molecules will inevitably hit the large particle substances in the process of exercise, such as pollen, so the pollen is moving. Because the movement of water molecules itself is random, the movement of pollen has a random situation. In addition, because the essence of temperature is exercise, the higher the temperature, the faster the internal molecular movement, so the pollen moves faster than in the cold water. At this point, the puzzle of Brown movement was finally solved. The Brown Sports itself is a random movement, so can photons that spread inside the sun in the form of Brown movement, can it be calculated from the time to reach the surface of the sun? can.

The distance between photons inside the sun involves three key factors in the form of Brown movement. One is the speed of photon movement, the second is the diffusion time, and the third is the average freedom.

The average freedom refers to the average distance between the two neighboring collisions of the molecule. Specific to the sun, the distance from the center to the surface of the sun is known, that is, the radius of the sun, that is, 695500 kilometers, the speed of photon movement is also known, that is, the speed of light, that is, 299792458 meters per second. As for the average freedom of photon movement inside the sun, although there is no exact data, scientists estimate that about 0.01 mm is estimated. With these three known quantities, the time required for photons from central movements to surface can be calculated, that is, the product of the solar radius removing the speed of light and the average free range of freedom. The result is about 5 million years. In other words, the photon that irradiated on us came from 5 million years ago.

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