Are we alone in the universe? It’s a question astronomers have pondered ever since we discovered Earth was not the only planet in the cosmos.我们是宇宙中唯一的智慧生命吗?自发现地球并非宇宙中唯一的星球以来,这个问题就一直盘桓在天文学家们的脑海之中。
But, while we conduct searches for habitable planets and even signals from an intelligent race, some experts have warned making first contact could be disastrous.
但是,当我们寻找可居住星球以及其他智慧生命时,一些专家警告道,尝试进行第一次接触可能引发灾难。
They say that if we were to broadcast our position, it could invite a hostile alien race to our doorstep - and ultimately spell the end of civilisation.
他们认为,如果我们公开了所处位置,就有可能把有敌意的外星生物引到家门口,最后导致人类文明的终结。
The latest data collected by Nasa and other space agencies suggests there could be as many as 40 billion potentially habitable planets in our galaxy, the Milky Way.
据美国国家航空航天局(Nasa)和其他宇航机构最新收集的数据表明,在银河系,有多达400亿个潜在的可居住星球。
Proponents of Seti (Search for Extraterrestrial Intelligence) have said we should consider Active Seti - sending out messages, rather than just listening, in the hope someone is out there.
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