The Arecibo message is broadcast from Puerto Rico.

The Arecibo Message is a radio signal sent into space on November 16, 1974, from the Arecibo Observatory in Puerto Rico as an interstellar attempt to communicate with potential extraterrestrial intelligence. Created by astronomer Frank Drake, in collaboration with Carl Sagan and others, the message was designed to demonstrate humanity’s technological advancement rather than serve as a direct attempt to contact alien civilizations. The message was aimed at the globular star cluster M13, about 25,000 light-years away, and encoded in binary form. It included a variety of information about humanity and Earth, such as the numbers 1 through 10, the atomic numbers of essential elements (hydrogen, carbon, nitrogen, oxygen, and phosphorus), a representation of DNA, a depiction of the human figure, a schematic of the Solar System, and an image of the Arecibo telescope. Transmitted as a powerful beam of radio waves, the Arecibo Message marked a milestone in the Search for Extraterrestrial Intelligence (SETI) efforts and remains an iconic example of humanity’s curiosity about the universe and our place within it.