(The Wow! signal represented as "6EQUJ5". The original printout with Ehman's handwritten exclamation is preserved by Ohio History Connection.)





The Wow! signal is considered as the most important evidence ever recorded in favor of extra terrestrial life existence.

What is The WOW! signal?

On 15 August 1977, Ohio State University's Big Ear radio telescope recorded strong narrow band radio signal.

Scientists have been searching for signs of intelligent life in the cosmos under the Search for Extraterrestrial Intelligence (Seti) programme since the 1960s.





"Ohio State University's Big Ear radio telescope was used to support the search for extraterrestrial intelligence."

The entire signal sequence lasted for the full 72-second window during which Big Ear was able to observe it, but has not been detected since, despite several subsequent attempts by others.

The signal appeared to come from the constellation Sagittarius and bore the expected hallmarks of extraterrestrial origin.





Interesting!





Astronomer Jerry R. Ehman discovered the anomaly a few days later while reviewing the recorded data.

He was so impressed by the result that he circled the reading on the computer printout and wrote the comment Wow! on its side, leading to the event's widely used name.









Misconception About Wow! signal



A common misconception is that the Wow! signal constitutes some sort of message.

In fact, what was received appears to be an unmodulated, continuous wave signal with no encoded information; essentially a flash of radio energy. The string "6EQUJ5" is merely the representation of the expected variation of signal intensity over time, expressed in the particular measuring system adopted for the experiment.





Plot of signal intensity versus time, fitted with a Gaussian function.

Readers should know the about the signal measurement system.

The alphanumeric sequence circled by Ehman, 6EQUJ5, represents the intensity variation of the radio signal over time, measured as unitless signal-to-noise ratio and ranging from 0 to 36, with the noise averaged over the previous few minutes. Each individual character corresponds to a sample of the signal, taken every 12 seconds. A space character on the printout denotes an intensity between 0 and 1; the numbers "1" to "9" denote the correspondingly numbered intensities (from 1 to 9); intensities of 10 and above are indicated by a letter: "A" corresponds to intensities between 10 and 11, "B" to 11 to 12, and so on. The highest measured value was "U" (an intensity between 30 and 31), that is thirty times stronger than normal background noise. - Wikipedia ( https://en.wikipedia.org/wiki/Wow!_signal

Many hypotheses have been advanced on the origin of the emission, including natural and man-made sources, but none of them adequately explains the result.

The Wow! signal remains the strongest candidate for an alien radio transmission ever detected.

















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