# Newton left The Three-Body Problem 350 years ago and now solved by scientists

Beijing time on December 19, nearly 350 years ago, Newton discovered the three laws that describe the motion of objects, the third of which is “the force of action and the reverse force is equal in size, in the opposite direction.” Newton’s laws of motion laid the foundation for our understanding of the solar system’s operation and the relationship between objects and the forces that act on them. The significance of Newton’s laws of motion does not have to say, but it also creates a problem that has plagued scientists for nearly 350 years: The Three-Problem.

After using the laws of motion to describe the Earth’s orbit around the sun, Newton concluded that they could also help people understand the question of how the Earth orbits the sun when a third object, such as the moon, is added. But in practice, it is much more difficult to solve the Three-Problem Body equation.

When two (or three) objects of different sizes and distances operate around a central point, it is easy to calculate their motion using Newton’s laws of motion. However, if the size of the three celestial bodies and the distance from the center point, the interaction force between them will change, the system will be in disarray, using ordinary mathematical knowledge to calculate the motion of each celestial body is impossible.

An international research team led by Astrophysicist Nicholas Stone of the Raqqa School of Physics at the Hebrew University of Israel has taken a big step forward in solving this problem. Their research paper is published in the latest issue of the journal Nature.

Nicholas Stone, astrophysicist at the Raqqa School of Physics at the Hebrew University of Israel, who led the puzzle of solving the Three-Body Problem system

Stone and the University of Concepci?n in Chile took full advantage of the research of the past two centuries, in particular that “the unstable The Three-Body Problem system will eventually eliminate an object and form a stable binary system”. This duality is the focus of their research.

Instead of seeing the system’s chaotic state as an obstacle, the team used traditional mathematical calculations to predict the motion of planets. “When we compared our predictions with computer models of their actual motion states, we found that our predictions were quite accurate, ” Stone said. “

Although the team stressed that their findings were not a precise solution to the Three-Body Problem problem, their results were useful, allowing physicists to visualize complex physical processes.

“In the case of three black holes orbiting another black hole, for example, their orbits will be unstable – even when a black hole is ‘kicked out’, and we are still very interested in the relationship between the two black holes left behind,” Stone explains. The ability to predict new orbits is critical to our ability to understand the behavior of survivors in the unstable Three-Problem Body system in the newly formed stable system.