Why can’t we find evidence for extraterrestrial intelligence? The following video animation by Andrew Park is a fairly basic primer on the Fermi Paradox, but is probably a handy starting point for further discussion of the question of whether we are truly ‘alone’ in our galaxy:
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.