国家地理-寻找下一个地球

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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...