The contents of Humanity's first space postcard and how to read it

Voyager I is now officially flying into interstellar space. In the future, an alien spaceship may come across it. When they do, they will find two things: a golden disc and a record player. These are the contents of that disc and how to interpret it.

The original version of this post was published in Gizmodo on February 2013.

When this happens, we will subject the aliens to the same torture that gadget companies have been imposing on us for decades: the user manual you can see above. It's not hard to imagine that this reason alone will be enough to cause an interplanetary war.

The origin

When NASA started to work on the two Voyagers, Carl Sagan and other scientists working in the project wanted to include a description of us and our planet, for anyone who could come across the spaceships, being alien or human. His words:

The spacecraft will be encountered and the record played only if there are advanced space-faring civilizations in interstellar space. But the launching of this 'bottle' into the cosmic 'ocean' says something very hopeful about life on this planet.

Sagan also publicly said that "the record is best seen as a time capsule or a symbolic statement more than a serious attempt to communicate with extraterrestrial life" but, knowing his views on the matter, I can't help but think that he probably had some hope about it being found by someone.


To that effect, a team started to curate a list of sounds, music pieces and images that would be the perfect representation of planet Earth. Or, at least a nice testimony of our understanding of it.

They recorded all this data in analog form on one side of the disc. That was the only technology available at the time, when they launched in 1977. No MP3s or JPEGs or animated GIFs. On the other side of the disc they etched a quick reference card. I can't make any sense out of it, but obviously I'm neither an engineer nor an alien, despite what some of my wives have said.

If they are successful at deciphering this gibberish—and, given that they will have interstellar spaceships, chances are that they will be more successful than you or I—they will get to listen to the sounds in this video among many others.

Carter's gloomy greeting

Some of them are quite scary. I don't know if I would like to visit Earth after listening to them—although, by the time someone finds this, the things making those sounds will probably be gone from the face of the planet. Jimmy Carter, then US President, included the following message:

This is a present from a small, distant world, a token of our sounds, our science, our images, our music, our thoughts and our feelings. We are attempting to survive our time so we may live into yours.

Never a greeting card was so gloomy as this one.

The aliens will also get to hear music from Beethoven, Mozart, Bach and Stravinsky, along with Blind Willie Johnson and Chuck Berry. I'm quite happy to know that Berry will be rocking in the clean room of some Imperial Star Destroyer. Roll Over, Vader.


They will also find the images in the second video. 116 images encoded in analogue form, composed of 512 vertical lines—a video signal that will play fine in any old TV set. The images were selected to give a good idea of our place in the universe, showing everything from the planets in our solar system to our internal body structure (always nice to show your guts to hungry aliens) and different scenes from Earth.

Prudes in space

Incredibly enough, among the images there weren't any pictures of a naked man or woman, showing us bare as species. Apparently, NASA told Sagan and his colleagues that they wanted to avoid the controversy of the Pioneer plaque, which was attacked by prude conservative groups in the United States—which I guess is a testimony of the sad state of things in this country at the time (and now).

I didn't learn about that until today and I'm speechless that NASA conceded. It seems that some people were—and still are, I'm sure—afraid to show human penises and breasts to an alien civilization traveling in a spaceship. Think about that. Now that is reason enough to wipe out our planet. Or at least, abduct all those morons. Maybe that's what the rapture is all about.

In any case, chances are that aliens will hear and see us way before someone crosses paths with this golden greeting card. Radio signals travel way faster than Voyager—at the speed of light—and in every direction. And we have been sending them for decades now. Even if the radio signals degrade after 50 light years, a passing starship flying a few light years away (or perhaps a listening outpost) would catch them sooner and easier than finding Voyager—which, in the immensity of space, it's the perfect example of the proverbial needle in a haystack.

It's Official: Voyager 1 Has Left the Solar System

After months of back and forth, scientists now agree that NASA's Voyager 1 has become the first manmade object to leave the solar system. And it only took 36 years to make the 12 billion mile-long journey.

It's obviously a major milestone for space exploration which is probably why scientists have been arguing for months over whether or not Voyager 1 had crossed the threshold into interstellar space. In the end, it all came down to the plasma surrounding the spacecraft. After a burst of solar wind and magnetic fields caused the plasma around the spacecraft to oscillate in April, researchers realized plasma was also 40 times denser at that point than it was in the heliosphere. This was a sign that the Voyager 1 had entered interstellar space, and the team ultimately determined that the spacecraft crossed the line in August 12 of last year. (Listen to the sound of interstellar space below.)


"Voyager has boldly gone where no probe has gone before, marking one of the most significant technological achievements in the annals of the history of science, and adding a new chapter in human scientific dreams and endeavors," said NASA’s associate administrator for science John Grunsfeld. "Perhaps some future deep space explorers will catch up with Voyager, our first interstellar envoy, and reflect on how this intrepid spacecraft helped enable their journey."

In the meantime, all eyes are on Voyager 2, which is nipping at its sibling's heels, speeding fast into interstellar space. (That is, if 2 billion miles can be considered nipping at its heels.) Either way, Voyager is now on its way to another star. At it's current speed of 100,000 miles per hour, it'll only take her 40,000 years.

What interstellar space sounds like:

How scientists decided Voyager had entered interstellar space: