translation.en: It drove us to the moon. We -- literally in fear -- with the Soviet Union raced to the moon. And we have these huge rocks, you know, killer-sized rocks in the hundreds of thousands or millions out there, and while the probability is very small, the impact, figured in literally, of one of these hitting the Earth is so huge that to spend a small fraction looking, searching, preparing to defend, is not unreasonable.
translation.zh: 它驱使我们登上月球。我们是在恐惧中与前苏联 进行着登月竞赛。宇宙中这些巨大的石块， 成千上万颗毁灭级尺寸的石块漂浮在外太空， 尽管它们之中任何一块击中地球 的概率非常小，但若是真的发生， 其影响是如此之巨大， 为此支出一些费用来观测、搜寻 以及预防这样的情况并不过分。