In 1976, the whole world was not a quiet year. On July 28, there was a big earthquake in Tangshan area of China, with countless deaths and injuries. On August 16, a magnitude 8.1 earthquake occurred in the Philippines. Before and after the two great earthquakes, there were six earthquakes with magnitude 7 or above on the earth. Why do earthquakes occur so frequently in such a short period of time? After that, scientists did a lot of research.
In the process of research, we found a phenomenon that we can’t understand. A comet approached the earth in June, and it was very close to the earth in the next three months or so. That is to say, during this period, many large earthquakes occurred on the earth. Not only that, through long-term follow-up investigation, scientists found that in the past 2000 years, when large-scale earthquakes occurred on the earth There will be more comets around the earth. Is there really a close relationship between the two? The scientists made bold assumptions.
This idea has also been questioned by many parties. As we all know, earthquakes are caused by crustal movement. They occur in the interior of the crust. External factors can not affect them to a great extent. Comets are located outside the earth’s atmosphere. Although comets are large in size, their mass is very small. Can comets that are so far away from the earth’s crust and only so small in mass really trigger crustal movement?
If this idea is true, where does the comet come from and how does it affect the earth’s crust? Scientists have many hypotheses about this.
There is a hypothesis that far away from the solar system, there must be a headquarters of comets, which can be called comet cloud. There are many cometary nuclei, and the comets we observed come from there.
There is also a hypothesis that comets are not members of our solar system. They must come from the depths of the universe outside our solar system. There, due to the instability of gravity, many nebulae break up and are decomposed into laughing groups. They may be gaseous or solid. They are slowly attracted from far away under the action of the sun’s gravity. In this process, the particles around them are attracted together bit by bit to form a large looking solid, that is, a comet.
Of course, these are all hypotheses. There is no evidence of hammer. We still need our scientists to continue to work hard to find the relationship between comet and earth one day earlier.