What you didn't know about the first time we tried to contact aliens National GeographicOpinion | It’s the Perfect Moment to Search for Intelligent Alien Life The New York TimesWhy did Earth’s first radio message to alien civilizations leave out half of humanity? Nature.comThe Arecibo Message, an attempt to communicate with extraterrestrials, is sent into space HistoryHow Astronomers Tried to Communicate with the Cosmos Scientific American