In 1974, we sent a radio signal from the Arecibo radio telescope in Puerto Rico to the M13 globular star cluster.M13 is over 25,000 light years away.We never expected a reply.In 2132, we got one.
In 1974, we sent a radio signal from the Arecibo radio telescope in Puerto Rico to the M13 globular star cluster.M13 is over 25,000 light years away.We never expected a reply.In 2132, we got one.