Life on Earth could even be threatened by an extraterrestrial civilization, Hawking has pointed out on his Discovery Channel television series, "Into the Universe with Stephen Hawking."
地球上的生命可能受到外星球文明的威胁，霍金在Discovery电视频道系列节目“进入斯蒂芬·霍金的宇宙”中指出。
Life on Earth could even be threatened by an extraterrestrial civilization, Hawking has pointed out on his Discovery Channel television series, "Into the Universe with Stephen Hawking."
地球上的生命可能受到外星球文明的威胁，霍金在Discovery电视频道系列节目“进入斯蒂芬·霍金的宇宙”中指出。
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