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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" or explanation of where Voyager came from and what our planet is like. Here's what the symbols on the front are supposed to represent.
The contents of the Golden Record were organized by Carl Sagan, the most-recognized astronomer of the 1970s. Here's Earth which is labeled by the contents of our atmosphere.
Some scenes of Earth cities are already dated--even before aliens find them. The Golden Record contained photos, audio and video of nature, everyday life and our achievements to give an idea of what our planet was like in 1977.