The Voyagers’ Golden Record: What We Chose to Represent Humanity to Aliens
📚What You Will Learn
- What sounds and images were chosen to represent Earth.
- How the record ensures playback by aliens using symbolic instructions.
- The personal story behind the brainwave recording.
- Why it's built to last billions of years in space.
📝Summary
ℹ️Quick Facts
- Two identical 12-inch gold-plated copper records, one on each Voyager spacecraft launched in 1977.
- Contains 116 images (115 meaningful + 1 calibration), 90 minutes of music, greetings in 55 languages, and sounds like whale songs and laughter.
- Includes Ann Druyan's compressed brainwaves and heartbeat, capturing her thoughts on love and Earth's history.
💡Key Takeaways
- A deliberate snapshot of Earth's cultural and natural diversity, selected to portray humanity beyond technology.
- Engineered for longevity with uranium-238 plating to date its age billions of years from now.
- Features playback instructions using universal symbols like pulsar maps and hydrogen atom transitions.
- Embodies optimism: 'per aspera ad astra' (through hardships to the stars) in Morse code.
- Hand-etched inscription: 'To the makers of music – all worlds, all times'.
In 1977, NASA launched Voyager 1 and 2 toward the outer solar system, each carrying a Golden Record as a message for any extraterrestrial intelligence. Inspired by Pioneer plaques, project manager John Casani tasked Carl Sagan's committee to create this gold-plated copper phonograph record—a durable time capsule.
Encased in aluminum with uranium-238 for age-dating, it's etched with 'To the makers of music – all worlds, all times'.
The audio side bursts with Earth's symphony: whale songs, thunder, birds, footsteps, laughter (including Sagan's), and heartbeats. Greetings in 55 languages span from ancient Akkadian to modern Wu, plus messages from President Jimmy Carter and U.N. Secretary Kurt Waldheim.
A 90-minute music playlist mixes Bach, Beethoven, Chuck Berry, and global folk tunes.
Morse code spells 'per aspera ad astra'.
Encoded as analog scans, 116 images (one for calibration) show math basics, DNA, human anatomy, planets, animals, cities, and anatomy diagrams. Scales for size, time, and mass are defined using universal physics like hydrogen transitions.
Unlike Pioneer's nude figures, Voyager's 'vertebrate evolution' image features a waving woman.
They aim to depict life's diversity from cells to civilizations.
The most personal track: Ann Druyan's heartbeat and hour-long brainwaves, compressed to one minute, recorded as she fell in love with Sagan. She pondered Earth's history, wars, hopes, and the thrill of love—now echoing through space.
This raw human emotion was her contribution to humanity's cosmic intro.
The cover diagrams explain playback: stylus position, 3.6-second rotation in hydrogen time units, and a pulsar map pinpointing our Solar System. Binary notations and hydrogen atom illustrations ensure any advanced species can decode it.
Sagan noted it's for spacefaring civilizations only—Voyagers drift in interstellar voids today.
⚠️Things to Note
- Records play at 16 2/3 RPM; images encoded as analog raster scans with 512 lines.
- Protected in aluminum covers with stylus and cartridge; only advanced civilizations likely to play it.
- Preceded by Pioneer plaques but far more ambitious with audio and visuals.
- Ann Druyan's brainwave track: 60 minutes of thoughts compressed to 1 minute.