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。
The series will be airing on the Discovery channel starting this Sunday at 8pm (it aired on BBC late last year) and will be coming to DVD and Blu-ray soon.
《生命》系列将于本周日(3月21日)八点在《探索频道》播出(去年已经在BBC首播过了)，DVD和蓝光光碟不久以后就会推出。
The series will be airing on the Discovery channel starting this Sunday at 8pm (it aired on BBC late last year) and will be coming to DVD and Blu-ray soon.
《生命》系列将于本周日(3月21日)八点在《探索频道》播出(去年已经在BBC首播过了)，DVD和蓝光光碟不久以后就会推出。
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