From Arecibo to the WOW Signal: How We Try to Talk to Aliens

Are aliens already trying to reach us — and would we even recognize the call? This episode traces the boldest attempts to speak across the stars. From the Arecibo Message beamed at M13 to NASA’s Pioneer 10 plaque and Voyager’s Golden Record, we unpack what humanity chose to say, why, and who decided. Then we follow SETI’s hunt through the cosmic noise, where one 72–second burst at Ohio State’s Big Ear stunned astronomers enough to write one word in the margin: wow. What made that signal 30 times louder than nature, why it never repeated, and why the “waterhole” band keeps researchers listening are all explored. Along the way, we confront the controversy: is broadcasting a “scientific suicide note,” or is Earth already impossible to hide? And if a reply comes, what primer would let us decod