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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.。下载安装 谷歌浏览器 开启极速安全的 上网之旅。是该领域的重要参考
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这次最有意思的发现是：上过太空的这只鼠妈妈，居然比普通小鼠还能生。
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