The engines fired and Apollo 8 slid silently behind the Moon. The men heard a crackle in their headsets as the radio signal to Mission Control faltered and then failed.
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One lunar day is equivalent to four weeks on Earth, made up of two weeks of continual sunshine and two weeks of darkness. That makes relying on solar power very challenging.。关于这个话题，heLLoword翻译官方下载提供了深入分析
Source: Computational Materials Science, Volume 267
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