The Earth-Moon system has always been perplexing.
地月系统一直令人困惑。
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。
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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