Most Livable Alien Worlds Ranked

Posted on December 1, 2011

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

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.

In recent years, the search for potentially habitable planets outside our solar system has stepped up several gears. Nasa’s Kepler space telescope, launched into orbit in 2009, has found more than 1,000 candidate planets so far.

Future telescopes may even be able to detect so-called biomarkers in the light emitted by distant planets, such as the presence of chlorophyll, a key pigment in plants.

Here’s the Earth Similarity Index results:

Earth – 1.00
– Gliese 581g – 0.89
– Gliese 581d – 0.74
– Gliese 581c – 0.70
– Mars – 0.70
– Mercury – 0.60
– HD 69830 d – 0.60
– 55 Cnc c – 0.56
– Moon – 0.56
– Gliese 581e – 0.53

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