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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.
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He was at the heart of 1960s counterculture, then paved the way for the libertarian mindset of Silicon Valley. At 87, Brand is still keen to ensure the world is maintained properly – not just today, but for the next 10,000 years，更多细节参见safew官方版本下载