As the central celestial body of the solar system, the sun has 8 planets, as well as asteroids and meteors, comets, interstellar dust and so on. Moreover, the above-mentioned stars all revolve around the sun, but the sun also needs to revolve around the center of the Milky Way. In addition, the diameter of the sun is about 1.3 million kilometers, which is comparable to 109 Earths, and the volume is also equivalent to about 1.3 million times that of the Earth. It is reported that three-quarters of the sun is hydrogen, and the rest is helium and oxygen, carbon, iron, etc., and the reason why the sun can emit light and heat is closely related to the way it adopts nuclear fusion. And so far, the age of the sun is about 4.5 billion years old, and the distance from the earth is about 150 million kilometers.
However, after observation and research by scientists , it is found that the sun that humans see on the earth may not be the sun 8 minutes ago. According to the previous statement, according to the distance between the sun and the earth, plus the speed of light propagation, the sun seen on the earth basically belongs to the sun 8 minutes ago. After all, the earth will revolve around the sun. According to this concept, it can be said that there are not too many problems to call it the sun 8 minutes ago. However, some scientists believe that the sun that humans see on the earth is likely to be the sun 100,000 years ago. This statement can be said to have refreshed human cognition. So what is going on?
According to our understanding, the sun will emit light and heat because it can undergo nuclear fusion, but it is not realistic to collide atoms only with the pressure on the surface of the sun. Instead, it needs to release a lot of energy through the interior of the sun to carry out nuclear fusion. Since the diameter of the sun is about 1.3 million kilometers, it takes about 100,000 years to travel from the interior of the sun to the surface for nuclear fusion.It is not difficult to understand why scientists believe that the sun that humans see on Earth belongs to the sun 100,000 years ago.
Of course, this does not mean that this finding is 100% correct, but that this method also has certain truths according to the relevant data. For this reason, it cannot be said that this finding is incorrect, nor can it be said that the previous statement 8 minutes ago was incorrect. However, the latest findings of scientists have indeed made it more difficult for the outside world to accept, which is why it is said that the cognition has been refreshed.
It is worth noting that the reason why there are different statements is entirely according to the current technology of mankind, and it is not easy to truly understand the universe. Moreover, due to the limitations of technology, in order to fully understand the universe, at least we need to continuously improve the technology mastered by human beings, so that we can have a deeper understanding of the universe.
(text/Huaqiang)
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