File:Arecibo_message.svg · Wikimedia Commons · See Wikimedia Commons
Arecibo message
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Encyclopedic overview
This is a demonstration of the message with color added to highlight its separate parts. The binary transmission sent carried no color information.
The Arecibo message is an interstellar radio message carrying basic information about humanity and Earth that was sent to the globular cluster Messier 13 (M13) in 1974. It was meant as a demonstration of human technological achievement rather than a real attempt to enter into a conversation with extraterrestrials.
Excerpted from Wikipedia’s “Arecibo message” article, available under the CC BY-SA 4.0 licence.