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In 1974 Carl Sagan orchestrated an effort to send a radio transmission towards M13 that cryptically describes the Earth's location and the nature of human biology. The message will reach any aliens there in about 25,000 years.
@Skywise Oh great, so we only have 50,000 years to sort our human shit out and to prepare for the oncoming invasion. This is going to be a lot of work in a tight schedule. Thanks, M. Sagan.