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.
More articles by Ryan Hunt…。同城约会对此有专业解读
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Source: Computational Materials Science, Volume 267。爱思助手下载最新版本对此有专业解读