A red dwarf star 20 light-years away may have the first habitable planet outside our Solar System. The planet "Gliese 581d" is at the colder outer edge of the "Goldilocks zone" in which liquid water can be sustained. This is one of the best chances for proof of alien life on another planet. Click here for video >>>>> http://www.bbc.co.uk/news/science-environment-13423085
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