Smart Luck: How the Big Bang Was Found by Accident [Slide Show]
Two astronomers recall almost mistaking light from the big bang for pigeon droppings
![Smart Luck: How the Big Bang Was Found by Accident [Slide Show]](https://static.scientificamerican.com/sciam/cache/file/9520A6FF-A367-4C78-AB6637EA70C2BF5B.jpg?w=590&h=393)
Smart Luck: How the Big Bang Was Found by Accident [Slide Show]
- Horn Antenna: This six-meter radio telescope at Bell Labs in Holmdel, N.J., was the instrument on which the cosmic microwave background (CMB) radiation was discovered. This light, left over from shortly after the big bang, pervades the universe and carries a record of the first epoch after the birth of the cosmos. Credit: Clara Moskowitz
- Historic Landmark: The Horn Antenna that Penzias and Wilson used to make their discovery still stands, although it is no longer in use for astronomy. The instrument was designated as a National Historic Landmark in 1988 for its role in the significant finding, which opened the gateway to modern cosmology. Credit: Clara Moskowitz
- Pigeon Droppings: Penzias and Wilson famously considered the possibility that the radio noise their telescope detected was contamination caused by pigeon droppings on the antenna. “Arno and I got a ladder and went up there and scrubbed off the inside of the horn,” Wilson recalled. In fact, that noise turned out to be a relic from the beginning of the universe. Credit: Clara Moskowitz
- Cornucopia Shape: The shape of the Horn Antenna blocks stray radio waves from reaching the telescope, accepting only the light on a direct path to the main reflector. This configuration allows it to make sensitive measurements of far-off objects without interference from background radiation. Credit: Clara Moskowitz
- Project Echo: The Holmdel Horn Antenna measures 15 meters long, with a six-meter by six-meter collecting aperture. It was built in 1959 for NASA’s Project Echo, an early test of satellite communication that aimed to transmit and receive radio signals bounced off passive, inflatable satellites placed in Earth orbit. Credit: Clara Moskowitz
- Radio Astronomy Pioneers: Robert Wilson speaks at the anniversary celebration next to a photo of himself and collaborator Arno Penzias standing next to the Horn Antenna during the 1960s, when the pair first detected the confusing signal that turned out to be the CMB radiation. Credit: Clara Moskowitz
