Read More: Voyager 2, Pioneer 11, Arecibo Observatory, Pioneer 10, Voyager 1, WOW! Signal, Are We Alone, Science News
A couple of weeks ago the Arecibo Observatory in Puerto Rico sent a special radio signal to outer space. The idea of communicating with other cosmic beings has long fascinated humans. This was not the first time we have tried to "converse" with our presumed galactic neighbors.