PICTURES: 3 Worlds Most Likely to Harbor Life Named

PICTURES: 3 Worlds Most Likely to Harbor Life Named
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Of the five worlds measured with the new Standard Microbial Habitability index, Saturn's moon Titan (pictured) was the least promising, earning a score of less than 0.001.

That's because the moon's subsurface temperatures and the pressure of its dense atmosphere are too extreme to harbor widespread life, at least as we know it, Mendez said in October 2009.

"If there's life on Titan, it will rely on hot spots," he said. "Globally, the verdict is not so good."
— Image courtesy NASA/JPL/Space Science Institute
 
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