A representation of the Arecibo message as a 73x23 grid with filled squares for “1” and black squares for “0.” Color has been added to the filled squares to separate distinct parts of the message, like the approximate shape of a person or the portion representing our base 10 numerals.

Notices where this attachment appears

1. Robert McNees (mcnees@mastodon.social)'s status on Thursday, 16-Nov-2023 18:07:30 UTC Robert McNees

   The "Arecibo Message" was beamed towards globular cluster M13 #OTD in 1974, during the dedication of an upgrade to the radio telescope. It was the first message sent with the intention of alerting extraterrestrials to life on earth.

   The message was 1679 bits, arrayed into 73 rows and 23 columns. It contained depictions of the numbers 1-10, the solar system, the human form, and info about the elements and biochemical structures associated with life on Earth.