How the three-body problem continues to baffle scientists

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How the three-body problem continues to baffle scientists
PhysicsSpace
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Recently, this age-old scientific problem has gained widespread attention through a popular Netflix adaptation of Liu Cixin's sci-fi masterpiece.

Can we predict the motions of three objects in space, such as stars or planets, as they interact gravitationally? The answer is not as straightforward.Kepler-16b, the most"Tatooine-like" planet yet found in our galaxy is depicted here in this artist's concept with its two stars.This is the essence of the three-body problem, a mathematical conundrum that has perplexed astronomers and physicists for centuries.

This historical context illuminates why the problem remains significant, bridging centuries of astronomical and mathematical research while highlighting both our progress and the mysteries that persist in celestial mechanics. These small tugs worried Newton, who feared they might eventually destabilize the entire solar system. Unable to reconcile this mathematically, Newton resorted to a divine explanation, positing that God occasionally intervened to maintain cosmic stability.

As we peer beyond our cosmic neighborhood, we find that up to 85 percent of the billions of stars in the universe exist in binary or multiple-star systems. This underscores the importance of understanding the dynamics of three-body systems for comprehending the broader universe.The crux of the challenge lies in the chaotic nature of three-body interactions.

However, as soon as that smaller body moves closer or gains significant mass, all bets are off, and the full complexity of the three-body problem comes into play. This complexity scales up dramatically as we consider systems with four, five, or even thousands of bodies, such as in dense star clusters.

This model, based on the random movements of an inebriated person, is being adapted to calculate the probabilities of different outcomes in three-body systems.

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