In 1974, astronomers broadcasted a radio message of greeting towards the globular cluster M13, 25,000 light-years away.

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In 1974, astronomers used the Arecibo radio telescope in Puerto Rico to send a message towards the globular cluster M13, which is about 25,000 light-years away, as part of a demonstration of human technological achievement and an attempt to communicate with potential extraterrestrial intelligence.

In 1974, Astronomers Broadcasted a Radio Message of Greeting Towards