Most liveable alien worlds ranked

Saturn's moon Titan bears many similarities to the early Earth

Scientists have outlined which moons and planets are most likely to harbour extra-terrestrial life.

Among the most habitable alien worlds were Saturn's moon Titan and the exoplanet Gliese 581g - thought to reside some 20.5 light-years away in the constellation Libra.
The international team devised two rating systems to assess the probability of hosting alien life.

MORE: http://www.bbc.co.uk/news/science-environment-15863549

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