The Voyager Golden Record still carries humanity’s greeting to any alien finders

Bolted to the sides of two spacecraft now drifting far beyond the edge of the solar system are two identical gold-plated phonograph records, each holding a carefully curated snapshot of life on Earth for the benefit of any future finder capable of playing them. Known as the Voyager Golden Record, the disc was assembled in 1977 under the direction of astronomer Carl Sagan and a small committee of scientists and artists tasked with condensing the sounds, images, and cultural achievements of an entire planet onto a single piece of copper coated in gold. Nearly five decades later, both records remain intact, still traveling outward with the Voyager 1 and Voyager 2 probes long after the spacecraft’s other instruments have gone quiet.

What Sagan’s Committee Chose to Represent Humanity

Assembling the record required deciding, in a matter of months, what pieces of human experience deserved to represent the entire species to an audience that might not exist for millions of years. The committee settled on 115 images encoded onto the record in analog form, ranging from diagrams of human anatomy and DNA to photographs of everyday life, landscapes, and technology from around the world. Alongside the images, the record carries natural sounds of Earth such as wind, thunder, surf, and animal calls, meant to convey the planet’s living environment rather than just its human inhabitants.

Spoken greetings in 55 different languages were recorded for the disc, along with a message from the then-Secretary-General of the United Nations and a statement from the sitting President of the United States. A separate section of the record features roughly 90 minutes of music selected to reflect a wide range of human cultures and eras, mixing Western classical composers such as Bach and Beethoven with traditional and popular music from societies across the globe, including Chuck Berry’s rock and roll song Johnny B. Goode, a choice that drew both praise and criticism at the time as a representative sample of an entire species.

Instructions Etched for an Audience That May Never Exist

Because the record’s intended audience is potentially an intelligent civilization with no knowledge of human conventions, its cover was engraved with a set of symbolic diagrams rather than written instructions. Those diagrams explain, using basic physics and mathematics assumed to be universal, exactly how to play the record, including the correct playback speed and the stylus needed to trace its grooves, a cartridge and needle for which were also included with the spacecraft.

One of the most carefully designed elements on the cover is a map showing the relative positions of 14 pulsars, along with a unique timing signature for each one. Because pulsars emit radiation at extremely regular, well-documented intervals that gradually change in a predictable way over time, the map is intended to let a sufficiently advanced civilization calculate both the location of Earth’s sun and the approximate era in which the record was launched, essentially functioning as a cosmic return address.

A Built-In Clock Made of Radioactive Metal

The cover of the Voyager Golden Record also includes a small sample of ultra-pure uranium-238 electroplated directly onto its surface. Because uranium-238 decays into other elements at a fixed, well-understood rate over an extremely long half-life, any future finder capable of measuring how much of the original sample had decayed would be able to calculate roughly how much time had elapsed since the record left Earth, turning the cover itself into a self-contained radioactive clock alongside the pulsar map.

Two Spacecraft Now Farther From Earth Than Any Human Object

The two records left Earth in 1977 aboard the Voyager 1 and Voyager 2 spacecraft, which were designed primarily to study the outer planets of the solar system before continuing outward into interstellar space once their planetary flybys concluded. Voyager 1 became the first human-made object to cross into interstellar space in 2012, followed by Voyager 2 in 2018, meaning both golden records have already traveled beyond the direct influence of the sun’s solar wind and into the vast region between stars.

Both spacecraft continue to transmit data back to mission controllers on Earth using radio signals that take many hours to arrive even at the speed of light, though their power sources are gradually weakening and are expected to eventually fall below the threshold needed to keep any instruments running. Once that happens, the spacecraft themselves will continue drifting silently through interstellar space indefinitely, with the Golden Record remaining bolted to each one as the only artifact still capable of communicating anything about its origin.

A Message Built to Outlast Its Makers

Because interstellar distances are so vast, the odds that either record will ever be found and played by another civilization are widely regarded as extremely small, and the scientists who assembled it understood that reality from the beginning. The record’s real significance to many people has always rested less in the improbable chance of alien contact and more in the exercise itself, a group of scientists and artists forced to choose, under real constraints, what best captured the sounds, sights, and creativity of an entire planet for an audience that might be listening in a distant future long after the civilization that built it has changed beyond recognition.

Even now, decades after launch, the Golden Record occasionally resurfaces in public conversation whenever renewed interest in interstellar exploration or the search for extraterrestrial intelligence brings attention back to Voyager’s original mission. Replicas and detailed reproductions of the record’s audio and imagery have since been made publicly available, letting people on Earth listen to the exact same sounds and see the same images that are now farther from home than any other human-made artifact in history.

This article was produced with the assistance of AI and reviewed by Morning Overview editors.

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