The Golden Record, a message to Extra-terrestrials
The records are mounted on the outside of Voyager 1 and Voyager 2 and protected by an aluminum case. Etched on the cover of that case are symbols explaining how to decode the record.
Put yourself in an extraterrestrial’s shoes and try to guess what the etchings seek to communicate. Stumped? Hover over or click on the yellow circles for the intended meaning of these interstellar brain teasers: