TED-Ed

Why can't we see evidence of alien life? - Chris Anderson (2012x5)

Data de estreia: Mar 11, 2012

Stand by for an animated exploration of the famous Fermi Paradox. 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.