If you have two celestial bodies, like the Earth and the Moon, their gravity creates a predictable, stable orbit. This is the Two-Body Problem, solved centuries ago by Newton.
But add just one more star or planet of significant mass, and the system becomes mathematically unpredictable. This is the Three-Body Problem. Because there is no general closed-form solution, we have to rely on massive computer simulations to guess where those objects will be in the future.
This isn't just theoretical; it's the basis for Hugo-award-winning sci-fi and the reason why stable planetary systems (like ours) are so precious in a chaotic universe.
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