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自开创太空时代以来,几乎每一代美国人都看到身穿太空服的宇航员在危机四伏的人类太空飞行事业中付出惨重的代价——每当太空飞行计划在灾难之后重新振作起来的时候,每一代人都无法回避这样一些基本的问题:为什么我们要这样做?在更多紧迫问题需要资金和关注的时候却花费数十亿美元在太空旅行上,是什么使之名正言顺?
Almost every generation of Americans in the space age has seen the cost of astronauts wearing space suits pay devastating human spaceflight - whenever the spaceflight program rekindles itself after a disaster It is impossible for generations to evade such basic questions as: Why do we do that? Spending billions of dollars on space travel when more urgent problems need funding and attention What makes it justifiable?