如果宇宙挤满外星人——他们都在哪儿？
If the universe is teeming with aliens-- where is everybody?
Stephen Webb · 初版 2002 年
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单单在我们银河系中可能就存在4000亿颗恒星，而整个宇宙中或许有4000亿个星系，由此推论，在拥有140亿年历史的浩瀚宇宙某处，必然存在或曾经存在过至少与我们同样先进的文明。这一庞大到惊人的数字几乎迫使我们承认该假说的真实性。既然如此，我们为何至今未曾发现这些地外生命的任何证据、讯息或造物？在其广受欢迎的著作显著修订扩充的第2版中，Webb 详尽探讨了（目前而言的！）75个最……
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如果你对费米悖论不太熟悉，我强烈推荐 Stephen Webb 的书《If the Universe is Teeming With Aliens... Where Is Everybody?》[0]。他介绍了该问题的基本背景，然后以通俗幽默的方式盘点了五十种假说。其中很大一部分解释了为什么那些“显而易见”的解决方案（包括那个建议……
If you're not that familiar with the Fermi Paradox I highly recommend Stephen Webb's book If the Universe is Teeming With Aliens... Where Is Everybody?[0] He covers a basic intro to the problem and then goes through FIFTY proposed solutions in an accessible and entertaining manner. A lot of it explains why "obvious" solutions (including the suggestion…
任何对这个话题感兴趣的人都应该看看 Stephen Webb 的书《If the Universe Is Teeming with Aliens ... Where Is Everybody?》。虽然不算完美，但它梳理了费米悖论的大量可能解释（75种不同的解释！）。除了……之外，几乎涵盖了人们讨论这个话题时我见过的所有理论。
Anyone interested in this topic should check out Stephen Webb's book, "If the Universe Is Teeming with Aliens ... Where Is Everybody?". It's not perfect, but it goes over a lot of possible explanations (75 different explanations!) for the Fermi Paradox. It covers pretty much every theory I've seen when people discuss the topic, aside…
有一整本书都是关于人们多年来想出的各种假说：Stephen Webb 写的《If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?: Fifty Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life》
There's a whole book of solutions that people have thought up over the years: If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?: Fifty Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life by Stephen Webb
我正在读 Stephen Webb 的书（《If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY》），他描述了部分戴森球如何把恒星变成宇宙飞船，简直把我惊呆了（只要罩住除了一侧之外的所有面，释放出的能量就会推着它朝反方向前进）。想象一下真这么干……
I'm reading Stephen Webb's book (If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY), and he describes how a partial Dyson sphere can turn a star into a spaceship which blew my mind (just cover all but one side, the released energy will push it the other direction). Imagine doing that…