天外文明 meaning in English

extraterrestrial civilization

It is possible that some advanced civilization gets the energy they need through this method
或者在茫茫宇宙，确有先进的天外文明，利用这个方法抽取黑洞的能量呢！
In recent years , astronomers embark on a systematic search of interstellar radio signals that may originate from extraterrestrial civilizations
近年来，天文学家亦正手有系统地搜索来自外太空有意义的无线电波，冀能与天外文明接触。
When signals from pulsars were discovered in 1960s , we thought they came from some other civilizations . later on , we knew that this is not the case
当第一颗脉冲星在60年代被发现的时候，天文学家起初误以为这些讯号来自另一个天外文明后来发现不对后便产生了一个更严重的问题。