Approximately after 50,000 years one might expect an immediate response from a civilisation that received the signal sent to the globular cluster m13 which is 25,000 light-years away in 1974.
This entire experiment was known as Arecibo message. It is an interstellar radio message carrying basic information about humanity and Earth that was sent to globular star cluster M13 in 1974.
Instead of a genuine attempt to communicate with extraterrestrials, it was intended to be a showcase of human technical advancement. On November 16, 1974, during a ceremony to commemorate the remodelling of the Arecibo radio telescope in Puerto Rico, the message was transmitted through frequency modulated radio waves.
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