研究表明，如果外星星球覆盖50%云层就可能拥有液态水。
Alien world could host liquid water if it has 50 percent cloud cover, study says.
在过去的50年里，科学家们已经收察超越我们的星球的卫星星号。希望可以得到一些外星人生活的信息。
For the past 50 years, scientists have scoured the skies for radio signals from beyond our planet, hoping for some sign of extraterrestrial life.
在过去的50年里，科学家们已经收察超越我们的星球的卫星星号。希望可以得到一些外星人生活的信息。
For the past 50 years, scientists have scoured the skies for radio signals from beyond our planet, hoping for some sign of extraterrestrial life.
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