Saturday, April 28, 2012

Why Can't We See Evidence of Alien Life?

Why Can't We See Evidence of Alien Life? [video] | GrrlScientist | Science | guardian.co.uk: "Given the vast number of planets in the universe, many much older than Earth, why haven't we yet seen obvious signs of alien life? The potential answers to this question are numerous and intriguing, alarming and hopeful."

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