Wow! signal meaning
The Wow! signal is a strong, narrowband radio spike recorded on 15 August 1977 by the Big Ear telescope at Ohio State University. Jerry Ehman wrote “Wow!” beside it. It sat near the hydrogen line, 1420 megahertz. It has not been decoded, and it has not been repeated. It is not a message humans sent.
A strong narrowband spike, circled in red ink, and never repeated.
The name. Wow is the word Jerry Ehman wrote in the margin of a computer printout. The exclamation mark is his. The signal is the spike the printout recorded. The name is a note, not a translation of the spike.
Where it comes from
Big Ear was a flat radio telescope run by Ohio State, built for a survey and used, in the 1970s, to listen for narrowband signals that might not be natural. On 15 August 1977 it recorded a spike that rose well above the noise in one channel and then, as the Earth’s rotation carried the beam onward, fell away. The channel was near 1420 megahertz, the hydrogen line, which searchers already treated as a likely place for an artificial signal because hydrogen is common and the frequency is quiet. The computer printed the intensity as characters. Ehman, reviewing the page, circled the sequence and wrote Wow! in the margin. That pen stroke is the mark. The spike itself was never seen again, not by Big Ear and not, convincingly, by later campaigns aimed at the same patch of sky in Sagittarius. A one-time spike cannot be checked. It cannot be translated. It cannot be answered in any way that knows it was heard. Explanations have included a satellite, a terrestrial reflection, and a comet’s hydrogen cloud, the last of which Ehman and others have disputed. The honest summary is smaller: a strong signal was recorded once, near a suggestive frequency, and the margin note became the name. This page files it with the plaques because readers look for it there. The plaques are outbound. Wow! is inbound, if it is even a message. The lexicon draws a printout line and a margin note, not a decoded diagram. There is no decoded diagram.
Modern
A margin, not a translation
The famous object is Ehman’s handwriting as much as the intensity code. People wear the sequence 6EQUJ5, the characters on that line, as if it were a word in a language. It is a scale. Each character stood for a range of signal strength in the print format of that computer. It is not an alphabet of a sender. Treating the code as a motto reverses the page: the annotation is ours, the spike is unexplained, and the unexplained is not a text. A text can be read. This cannot.
Modern
Not the plaques, read backward
Pioneer and Voyager are messages with authors, dates, and a key. Arecibo is a message with an author and a single send. Wow! has a recorder and a frequency and no second copy. Putting it on the same line as the plaques is a warning against the easy story, that we called and something called back. The dates do not line up as a conversation. 1977 is after 1974, and the directions and the instruments are not a reply path. The line in this lexicon is called symbols sent into space. This entry is the exception, and it says so.
In popular culture
music · 2026
Muse, The Wow! Signal
Muse's tenth album takes the 1977 signal as title and theme of cosmic mystery and possible contact.
Press release and Irish Times review.
Sourcetv · 2024
3 Body Problem (Netflix)
The signal is detected in Inner Mongolia in the series' retelling.
The signal is detected in Inner Mongolia in the series' retelling, which is a later reading of the mark.
Sourcegame · 2013 / 2024
Grand Theft Auto V / Genshin Impact
'6EQUJ5' is painted at GTA V's Sandy Shores alien monument and is a Genshin achievement name.
The code records intensity, not a message.
Sourcetv · 1994
The X-Files, 'Little Green Men'
The season-two premiere references the signal.
The season-two premiere references the signal, which is a later reading of the mark.
SourceWorth knowing
Questions
What does the Wow! signal mean?
The Wow! signal is a strong, narrowband radio spike recorded on 15 August 1977 by the Big Ear telescope at Ohio State University. Jerry Ehman wrote “Wow!” beside it. It sat near the hydrogen line, 1420 megahertz. It has not been decoded, and it has not been repeated. It is not a message humans sent.
Where does the Wow! signal come from?
Big Ear was a flat radio telescope run by Ohio State, built for a survey and used, in the 1970s, to listen for narrowband signals that might not be natural. On 15 August 1977 it recorded a spike that rose well above the noise in one channel and then, as the Earth’s rotation carried the beam onward, fell away.
Why does 3 Body Problem use Wow! signal?
The signal is detected in Inner Mongolia in the series' retelling. The signal is detected in Inner Mongolia in the series' retelling, which is a later reading of the mark.
Why does Grand Theft Auto V / Genshin Impact use Wow! signal?
'6EQUJ5' is painted at GTA V's Sandy Shores alien monument and is a Genshin achievement name. The code records intensity, not a message.
Near this
- Hydrogen lineA spin-flip of the smallest atom, used as a ruler for strangers.
- Arecibo message1,679 bits, sent once, toward a cluster of stars.
- Voyager Golden Record coverInstructions for a disc: how to play it, and where the player lives.
- BinaryTwo digits. Every later machine script is a reader of them.
Sources
Named when the entry depends on a text, a date, or a standard. Catalog numbers are not invented.
Your margin
Private. It stays in this browser and never joins the canon.
symbol.wiki, edited as Sigilla. Last reviewed 20 October 2026. A reading of public tradition, not a ruling.