However, in fact, trisomy has a long history. What is trisomy? To put it simply, three celestial bodies can be regarded as the law of motion of particles under the interaction of gravity. In the novel Three-body, these three celestial bodies which can be regarded as particles are three stars. When there is only one star, the problem is very simple. Just like our sun, we can know the movement of the sun like the back of our hand.
When the number of stars increases to two, the problem becomes simple. This is a very common binary. The motion law of two stars under gravitational interaction does not need any profound theory, but only classical mechanics can accurately predict the trajectory of this binary system. Once the number of stars increases to three, the problem becomes very complicated.
No matter what the mass, initial position and initial velocity of the three stars are, it is almost impossible to accurately calculate the motion law of the three-body system.
In the novel Three-body, the problem is more complicated. In the novel, the planet where three people live is located in a three-body system with three stars. When the three stars are far away, the three-body planet will be in a long darkness and extreme cold, life will die and civilization will die.
When two or three of the three stars are close to the three-body planet, the three-body star will become a sea of fire, and life and civilization will die. When the three stars move irregularly, the day and night of the three-body star will change frequently, and civilization will not develop. Only when the three-body star is captured by the gravitational field of one of the three stars, and the other two are far away, the three-body star enters a regular day and night stage like the earth.
When the three-body planet is attracted by the gravitational field of the star at a certain moment and forms a regular alternation of day and night, it enters a constant era, and the rest can be called the chaotic era.
Three-body people can only develop their own civilization in the constant era. However, because the three-body is insoluble, people can't predict when and how long the constant era will come, so the three-body people must leave their homes and find a beautiful planet that will always be in the constant era, and then they discover the earth.
So is the three-body really insoluble? Three-body is a classical mathematical problem that has existed for a long time. Many scientists are fascinated by the study of three-body system, and many different calculation methods have been developed in the process, but none of them can accurately calculate the operation law of three-body system. However, science is constantly developing, and new algorithms will emerge one after another. 20 15 a new algorithm seems to have found a way out for the three-body system.
This new algorithm which can solve the three-body problem is called Brutus.
Brutus can not only solve the three-body problem, but also solve the multi-body problem composed of more particles. Of course, the essence of three-body involves chaotic systems, and there is no general solution. Strictly speaking, the result calculated by Brutus algorithm should be said to be an approximate convergent solution, and there is an error with the absolutely accurate result, but this error can be continuously reduced.
However, there is a problem with Brutu algorithm, that is, with the decrease of error and the improvement of accuracy, the amount of calculation will increase exponentially, and even the most advanced computers in the world will be overwhelmed. Due to the limitation of computing power, it will take several months to predict the next motion mode of the three-body system, which is obviously of little significance to solve practical problems. Until the addition of artificial neural network made the problem turn around.
In fact, the research of artificial neural network began in 1980s.
Simply put, it is to abstract the neurons of the human brain from the perspective of information processing, so as to produce different networks according to different connections. Researchers learn a large number of three-body data sets through artificial neural networks, so that they can acquire the reasoning ability of three-body motion. Compared with Brutus algorithm for several months, artificial neural network only needs 0.00 1 second to get the result, and according to thousands of calculation results, the accuracy is very close to Brutus algorithm.
The reason why the artificial neural network can get the results so quickly is that it does not calculate the data of every small step of the trajectory of the celestial body system, but only infers the motion mode by calculating the generated motion, so as to get the prediction of the future. If there is a three-body planet in reality, then we can help them solve a big problem.