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.
Author(s): Shuang Shan, Longfei Guo, Chongyang Wang, Zhen Li, Xinjie Wu, Haibin Wei, Fuyi Chen
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on a keypad. The machine then whisked the check away, printing the keyed data，推荐阅读爱思助手下载最新版本获取更多信息
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Donna Lu is an assistant editor, climate, environment and science at Guardian Australia