国家地理-寻找下一个地球（2011） - 免费在线观看 - 纪录片
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 fi
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 fi