Thirty-five years ago today a radio observatory at Ohio State University picked up a burst of radiation from space that was so strong the astronomer who came upon the data wrote "Wow!" on the printout of the data because of what it might have been:
"Its frequency was located just above and below naturally occurring radiation from hydrogen atoms. This frequency is exactly what some SETI theorists predicted an alien culture would use since it makes a kind of cosmic sense as a interstellar beacon. As alluring as this aspect of the 'WOW!' signal was, numerous repeated searchers with much more powerful receivers have never found anything like it again. Bummer.
"So what was the 'WOW!' signal? Who knows? That is what makes it enigmatic, fun and exciting."