Which Alien Worlds Are Most Livable?

Which Alien Worlds Are Most Livable?

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Astronomers have come up with a livability index for alien planets and moons, and the winners are … Titan in our own solar system, and the Gliese 581 planets in the extrasolar league. Rating systems for Earthlike and habitable planets may not make much difference now, but the developers of the Earth Similarity Index and the Planet Habitability Index say they could be crucial in the years ahead.

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