This week we ponder Fermi's Paradox with British astronomer Stephen Webb. This is the question of why can’t we detect any signs of intelligent alien life when we look to the skies. No signs of astro-engineering projects. No signatures of relativistic space travel. No obviously artificial electromagnetic waves, and so forth. And when you think of it, this is rather surprising. Or at least it was surprising to the ingenious physicist Enrico Fermi, who first drew attention to the matter. 

Learn about your ad choices: dovetail.prx.org/ad-choices