// block: Wait for space (unbounded pending queue)
NASA leaders argued that it makes more sense to uncover problems and practice operations close to home, in Earth orbit, rather than discovering them for the first time while attempting a landing on the moon. If the faster launch tempo holds, Artemis IV and Artemis V together could give NASA two opportunities in 2028. Officials stressed that the timeline still depends on hardware readiness and safety reviews.
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Source: Computational Materials Science, Volume 267，这一点在safew官方版本下载中也有详细论述
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