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为什么我们没有发现外星生命的痕迹？
2,953,509 views |
Chris Anderson |
TED-Ed
• March 2012
Read transcript
过来看看这个对著名的费米悖论的探索动画。为什么这个宇宙里面存在着无数行星，它们中的很多都比地球古老很多，然而我们没有看到明显的迹象表明外星生物的存在呢？潜在的答案很多，很吸引眼球，让人警醒，让人感到有希望。
education
universe
exploration
Planets
space
Big Bang
TED-Ed
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