Arecibo reply email

You're referring to the famous "Reply" email sent by the SETI Institute in response to the Arecibo message!

In 1974, a team of scientists at the Arecibo Observatory in Puerto Rico sent a message towards the star cluster M13, which is about 25,000 light-years away. The message was a binary code made up of 1,679 binary digits, and it was intended to be a greeting and a representation of humanity.

The message was received by the SETI Institute, which is a non-profit organization dedicated to searching for extraterrestrial intelligence (SETI). In response, the SETI Institute sent an email to the Arecibo Observatory on November 16, 1977, which was received on November 25, 1977.

The reply email was sent from the SETI Institute's computer, which was located at the University of California, Berkeley. The email was a simple message that read:

"Hello. We are the SETI Institute. We received your message and are pleased to respond. We are a group of scientists and engineers who are interested in searching for extraterrestrial intelligence. We hope that this message will be received and understood by any intelligent beings who may be listening."

The reply email was sent using a radio telescope, and it was received by the Arecibo Observatory on December 4, 1977. The message was a significant milestone in the search for extraterrestrial intelligence, as it marked the first time that a response had been sent to an extraterrestrial message.

It's worth noting that the reply email was not a direct response to the Arecibo message, but rather a general message of greeting and introduction. The Arecibo message was intended to be a one-way message, and it was not designed to elicit a response. However, the reply email was a significant event in the history of SETI, and it marked the beginning of a new era in the search for extraterrestrial intelligence.