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In the event that the Voyagers would make the first encounter with an extraterrestrial being, NASA decided to send a "Golden Record" time capsule, or explanation of where Voyager came from and what our planet is like. Here's the gold-plated record they sent and instructions for how to use it. I guess today we'd send an iPhone and expect the aliens to text us back.
Carl Sagan, the most-recognized astronomer of the 1970s, produced the record. Here is Earth, which is labeled by the contents of our atmosphere.
Some of the scenes of Earth cities are quite dated and could give aliens the wrong impression of life on Earth today. The Golden Record contains photos, audio and video of nature, everyday life and our achievements to give an idea of what our planet was like in 1977. At this time, Earthlings lived without PCs and smartphones. Plus, their televisions grew these funny antenae without HD. Wow.