-- Statement by astrophysics professor Adam Frank in a New York Times article titled "Yes, There Have Been Aliens." He discussed the findings of a paper titled "A New Empirical Constraint on the Prevalence of Technological Species in the Universe," which uses the Drake equation to re-estimate the likelihood of intelligent alien life given what we have learned to date about exoplanets, concluding "...even if you grant that level of pessimism, a trillion civilizations still would have appeared over the course of cosmic history."
