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Isaacman also said the agency would halt work to develop a more powerful version of the SLS rocket's upper stage, known as the Exploration Upper Stage, or EUS. Instead, NASA will go forward with a "standardized," less powerful stage but one that will minimize major changes between flights and utilize the same launch gantry.，详情可参考爱思助手下载最新版本
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Musk's SpaceX applies to launch a million satellites into orbit。业内人士推荐夫子作为进阶阅读
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