![]() In March 1995, American physicist, John Daniel Kraus explained an idea of how the universe could be searched for any emitted radio signals. During those 3 days, the United States embarked on a programme to detect and decode any potential Martian communication. With the arrival of radio, it was believed that the radio could be used to contact Martians after Guglielmo Marconi declared that his radio had been able to detect signals from Mars which could be a possible message.Īugust 21 to 23 in 1924, Mars was closest to Earth and visible almost all night. It was conducted by examining the electromagnetic radiations from other planets and stars for any signs of communication. SETI was established in the early 1900s for collective scientific study and search for extraterrestrial intelligent life in outer space. Search for Extraterrestrial Intelligence (SETI) The source of the signal was narrowed down to a space in the constellation Sagittarius, south of the 3-star cluster called Chi Sagittarii. The signal was a narrowband continuous radio signal with no break in modulation and had supporting data to prove that it indeed came from interstellar space. ![]() That is exactly what was depicted in the recording of the Wow! Signal. The intensity would be at its peak, marking the centre of the observation window and then, start dropping as the telescope moved away from the point. Estimations were made keeping in mind the speed of rotation of the Earth and the spatial width of the telescope, Big Ear was able to observe a given point for 72 seconds only.Īny constant extraterrestrial signal in such a case could be recorded for not more than 72 seconds, with the signal increasing gradually for 36 seconds as the telescope approached the point. Evidenceīig Ear observatory relied on the Earth’s rotation to scan the skies. Needless to say, the signal since then has been called the Wow! Signal. Pretty much the first word that any of us would say after knowing that there is probable proof of intelligent life beyond Earth. Big Ear was being used to detect possible signals from intelligent life in outer space, and on August 15, 1977, it received a very strong signal from outer space, that lasted for a good 72 seconds.Įhman was startled at this discovery and wrote “ Wow!” in red on the printout, after encircling the reading. Ehman was going through the recorded data of the Ohio State University‘s radio telescope, Big Ear and discovered a 72-second irregularity in the charts. ( Big Ear Radio Observatory and North American AstroPhysical Observatory (NAAPO)) Scanned copy of the original document that detected the Wow! signal.
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