Arecibo Message facts

While investigating facts about Arecibo Message, I found out little known, but curios details like:

The Arecibo Message that was sent once by humanity into space to extraterrestrials that contains info about elements that make up DNA, a graphic of a human, and a graphic of which planet in the solar system the message is coming from.

The Arecibo message was a 1974 interstellar radio message carrying basic information about humanity and Earth sent to globular star cluster M13 in the hope that extraterrestrial intelligence might receive and decipher it.

In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across. Here are 3 of the best facts about Arecibo Message I managed to collect.