The Earth-Moon system has always been perplexing.

地月系统一直令人困惑。

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In this picture, the Earth-moon system actually appears to be a double planet.

照片中，地月系统实际上看上去像一颗双行星。

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Then on the basis of invariant manifold theory and Poincaré section, a transfer trajetory between L1 and L2 of the Earth-Moon system was given.

然后基于不变流形理论和庞加莱截面方法，设计了不同拉格朗日点间转移轨道。

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"We'll be keeping an eye out for signs of a repeat performance next year when the Earth-moon system passes through the same region of space, " Cooke said.

CNN: Bright explosion on moon visible from Earth, NASA says