The Search for Extra Terrestrial Intelligence (SETI) has been conducted using radio telescopes for many years now. The Wow! signal was received on the 15th August 1977 by Dr. Jerry R. Ehman on the Big Ear radio telescope of Ohio State University. The signal lasted for 72 seconds and fit all the expected criteria for a signal from outside our solar system. Dr Ehman was so impressed that he wrote “Wow!” beside the printout of the signal hence the name Wow! signal. Many unsuccessful attempts have later been made to re-detect the signal. Its origin remains unknown and open to speculation.
Dr. Ehmans 30th anniversary report recounts the details.