三体星人非常幸运有两颗恒星，所以他们的生活非常悲惨。设两颗恒星的质量分别为M1,M2M_1,M_2M1​,M2​，而行星的质量对于恒星而言可忽略不计，那么这两颗恒星的运动方程是可以近似为解析解的，而且是高中水平的解析解。设二者的初始位置是(−x1,0),(x2,0)(-x_1,0),(x_2,0)(−x1​,0),(x2​,0)，令L=x1+x2L=x_1+x_2L=x1​+x2​，则x1x2=M2M1\frac{x_1}{x_2}=\frac{M_2}{M_1}x2​x1​​=M1​M2​​，记μ=M

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