昨天公布的发现又引发了另一个困惑难解、莫衷一是的问题:如果在TRAPPIST-1轨道的一颗行星上存在有智慧的外星生命,那么他们为什么没有努力与我们联系甚至来地球作客呢?
This is the famous conundrum dubbed the 'Fermi Paradox'. Back in the Forties, the renowned Italian physicist Enrico Fermi suggested that, with 100 billion stars in our galaxy, it was logically inevitable that intelligent life should have evolved elsewhere in the universe. So, Fermi asked, where are all the aliens?
这就是有名的谜题——“费米悖论”。早在上世纪40年代,著名意大利物利学家恩里科•费米就提出:我们的星系中有1千万颗恒星,从逻辑上讲,宇宙某处应该不可避免地演化出了智慧生命。所以,费米问道:外星人在哪里呢?
Yet 40 years of intensive searching for extra-terrestrial intelligence has yielded nothing. No radio signals, no credible spacecraft sightings, no close encounters of any kind.
然而,40年集中的星外智慧生命搜索之旅颗粒无收。没有无线电信号,没有可靠的星际飞行物目击,没有任何形式的近距离接触。
Geoffrey Miller, an evolutionary psychologist at the University of New Mexico, has proposed a disturbing answer. Perhaps there is a limit to how sophisticated a species can become.
新墨西哥大学的进化心理学家杰弗里•米勒提出了一个令人迷惑的答案。也许,物种演化的高级程度是有上限的。
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