Viewed on Aug. 15, 1977, by the Big Ear radio telescope at Ohio University, the signal was a strong, continuous, small band radio signal that lasted at least 72 seconds. Our signal knowledge is limited by the design of the Big Ear. Instead of being able to track radio signals like many modern radio televisions, the Big Ear was set up somewhere and relied on the Earth’s orbit to scan the sky. The reason is, Wow! the signal lasts 72 seconds. How long does it take the source to sweep the Big Ear checklist?
The Big Ear was also a permanent telescope. Astronomers just stopped him, and he was running alone, recording the power of the signals as he went. As a result, the signal was only received after the event days when the recording was recorded. By the time astronomers could return to look at the source, the event was over.
But despite just one glance, Wow! the signal is considered to be the strongest candidate for the external signal. Several natural sources have been suggested, but all are slightly missing. The basic idea is that the signal was grounded, perhaps a passenger plane or a radio signal scattered by space debris. But the aircraft will not be in the distance for more than 72 seconds, and there is no record of such a flight. A scattered signal is possible, but signal strength will be exceptional, as well as Wow! the signal is within range when the transmission is limited.
A few years ago, it was suggested that this phenomenon was caused by comets close to Space in the sky, but this has been disputed. While the two comet stars were near the source of the source, they were not really in the middle of the observed spectrum. And comets will probably not produce the signal of such a small band.
One exciting feature of the signal is that its frequency was very close to the so-called 21-inch line. This is a small radio emission caused by neutral hydrogen in the universe. Because hydrogen is the most common element in the universe, any astronomer in the universe can test it at that moment. If you wanted to pay attention to unknown astronomers, a solid signal near that frequency would be an excellent way to do it.