Join astronomers in a race to find a planet that can sustain life. Amid all the space in the universe, is there another world like ours? 　　Astronomers studying a nearby star say they've found the first potentially habitable planet—likely a rocky place with an atmosphere, temperate regions, and crucially, liquid water, considered vital for life as we know it. Other extrasolar plan...

　　第八季 (播出目录) (2014)    Season 08    　　S08E01 外星飞船  Alien Transports  (2014年06月13日)；