
Pigeons, a Giant Antenna, and the First Light of the Universe
Bell Labs’ horn antenna produced a stubborn, directionless hiss that pigeons nested in, but cleaning it out didn’t remove the signal. The persistent noise was later identified as the cosmic microwave background, the 13.8-billion-year-old afterglow of the Big Bang, a discovery credited to Penzias, Wilson, and Dicke and said to mark the birth of modern cosmology. Decades after, Voyager 1 revealed a separate, local plasma tone, underscoring how instruments can yield profound truths beyond their original purpose.






