Earth's first message for extraterrestrials is sent into space - November 16th, 1974 - a podcast by iHeartRadio & HowStuffWorks

On this day in 1974, scientists at the Arecibo Observatory in Puerto Rico sent the first message intended for alien lifeforms. 

See omnystudio.com/listener for privacy information.

Further episodes of This Day in History Class

Further podcasts by iHeartRadio & HowStuffWorks

Website of iHeartRadio & HowStuffWorks