A $1,500 cosmic message sent to the stars
In 1977, NASA launched two identical phonograph records into the void. Designed as a time capsule for any intelligent extraterrestrial life, these gold-plated copper disks carry the sounds, images, and even the brainwaves of Earth, drifting through interstellar space on a mission of profound hope.
The Voyager Golden Records were the brainchild of project manager John R. Casani, who tasked Carl Sagan with creating a more robust message than the simple plaques found on the earlier Pioneer 10 and 11 probes. With a modest budget of $1,500 for six weeks of work, Sagan and his colleagues—including Linda Salzman and Frank Drake—opted for metal phonograph records because they would better withstand the harsh outer space environment than magnetic tapes.
Curating the contents was a monumental effort that took nearly a year. The team assembled 116 images, ranging from scientific diagrams of DNA and human anatomy to landscapes and animals. To ensure clarity, the cover includes instructions on how to decode the analog-encoded signals and a pulsar map to help find our Solar System. The audio includes spoken greetings in 5 and 55 languages, natural sounds like thunder and whale songs, and a diverse musical selection featuring Bach, Mozart, and Chuck Berry.
The project also captured deeply personal human elements. The record contains an hour-long recording of Ann Druyan’s brainwaves, compressed into one minute of audio, capturing her thoughts on Earth's history and the experience of falling in love. While the team faced challenges—such as NASA vetoing nude photographs in favor of silhouettes and the legal difficulty of including the Beatles—the final product remains a 'bottle' tossed into the cosmic ocean, intended to represent the diversity of life on Earth.
As Voyager 1 and 2 travel through interstellar space, they carry a physical legacy that may last billions of years. The record's cover is plated with a sample of uranium-238, an isotope with a half-life of 4.468 billion years, which could allow a future civilization to determine the age of the spacecraft through mass spectrometry.
Source: Voyager Golden Record
