The Wow! Signal — A Message from Deep Space? — Paranormal History

What Was the Wow! Signal?

The Wow! Signal was a 72-second radio signal detected by the Big Ear radio telescope at Ohio State University on August 15, 1977, at 11:16 PM Eastern Time. The signal was remarkably strong — 30 times stronger than the background noise of deep space — and it matched the 1420 MHz hydrogen line — the frequency that scientists had long identified as the most likely channel for interstellar communication. The signal lasted exactly 72 seconds — the maximum time the Big Ear telescope could observe any single point in the sky. Astronomer Jerry Ehman circled the signal’s printout and wrote “Wow!” in red pencil, giving the signal its famous name. Despite decades of searching, the signal has never been detected again. The Wow! Signal remains the strongest candidate for an extraterrestrial radio signal ever detected.

History

The Big Ear Telescope

The Big Ear radio telescope was a groundbreaking instrument built in 1956 at Ohio State University’s Perkins Observatory in Delaware, Ohio. Designed by professor John Kraus, the Big Ear was unique among radio telescopes — it used a fixed, flat reflector (a plane mirror) measuring 340 feet long and 105 feet wide, paired with a curved cylindrical reflector to focus radio waves onto a series of receivers. The telescope was designed to survey the sky systematically — scanning the heavens as the Earth rotated, detecting radio sources across a wide range of frequencies.

By 1977, the Big Ear had been operating for over two decades and had become one of the most productive radio telescopes in the world. It had detected pulsars, radio galaxies, and other astronomical phenomena. It was also one of the early instruments used in SETI — the Search for Extraterrestrial Intelligence — the scientific effort to detect signals from alien civilizations.

The Detection

On the night of August 15, 1977, the Big Ear telescope was conducting a routine survey of the sky as part of a SETI project. The telescope was scanning the constellation Sagittarius — a region of the sky that includes the center of the Milky Way galaxy — when it detected an anomaly.

The signal appeared on the telescope’s computer printout as a series of letters and numbers:

6EQUJ5

In the Big Ear’s output format, each character represented the signal’s intensity — with letters corresponding to higher intensities than numbers. The sequence 6EQUJ5 indicated a signal that rose sharply in intensity, peaked, and then fell — a pattern consistent with a point source of radio emission passing through the telescope’s beam.

Astronomer Jerry Ehman — a volunteer observer who was reviewing the printout — noticed the anomaly and circled the characters in red pencil. He wrote “Wow!” in the margin, giving the signal its name.

The signal lasted 72 seconds — exactly the length of time a fixed point in the sky would take to pass through the Big Ear’s observation beam as the Earth rotated. This timing was consistent with a signal originating from a fixed point in deep space.

The Search for the Source

Ehman and his colleagues immediately attempted to identify the source of the signal. They checked the positions of known astronomical objects in the direction of the signal — a region of sky in Sagittarius, near the star Tau Sagittarii. No known object at that position was capable of producing a radio signal at 1420 MHz.

The team conducted additional observations of the same region of sky in the following days and weeks. The signal was never detected again — despite more than 100 hours of observation time dedicated to the search.

“I circled ‘Wow!’ because it was the most exciting signal I had ever seen.” — Jerry Ehman, 1977

The Mystery

Why 1420 MHz?

The significance of the signal’s frequency cannot be overstated. The 1420 MHz frequency — the hydrogen line — is produced by neutral hydrogen atoms in interstellar space. Hydrogen is the most abundant element in the universe, and its 1420 MHz emission is detectable across vast distances. For decades, SETI scientists had identified the hydrogen line as the most logical frequency for interstellar communication — the cosmic equivalent of a universal channel that any technologically advanced civilization would monitor.

The Wow! Signal was detected at exactly 1420 MHz — not merely near the frequency, but precisely on it. This precision suggested that the signal’s source — whatever it was — was deliberately transmitting at the most scientifically logical frequency for interstellar communication.

The Signal Strength

The Wow! Signal was 30 times stronger than the background noise of deep space. For comparison, most SETI detections — when they occur at all — are barely distinguishable from background noise. The Wow! Signal’s strength indicated that its source was either very powerful or very close — or both.

The signal’s intensity profile — rising, peaking, and falling in a smooth curve — was consistent with a point source of emission. This ruled out diffuse sources such as interstellar gas clouds or the Milky Way’s galactic center. The signal appeared to originate from a specific, localized point in deep space.

The Duration

The signal lasted 72 seconds — exactly the time it would take for a fixed point in the sky to pass through the Big Ear’s observation beam. This timing was consistent with a stationary source — one that was not moving relative to the telescope. If the source had been moving — like a satellite or a planet — the signal’s duration would have been different.

The 72-second duration also meant that the Big Ear could observe the source for only one pass. The telescope’s fixed reflector meant that any point in the sky was visible for only 72 seconds before the Earth’s rotation carried it out of view. A second observation would require the source to remain in position for another 24 hours — an unlikely scenario for a random cosmic event.

The Lack of Repetition

The most frustrating aspect of the Wow! Signal is that it was never repeated. Despite more than 50 years of searching — using the Big Ear, the Very Large Array (VLA) in New Mexico, the Arecibo Observatory in Puerto Rico, and other instruments — the signal has never been detected again.

The lack of repetition has been the primary argument against an extraterrestrial origin. If the signal were a deliberate transmission from an alien civilization, scientists reason, it would be repeated to ensure that its intended recipients could detect and analyze it. The fact that the Wow! Signal appeared only once suggests that it may have been a natural phenomenon — a transient event that happened to occur at the right frequency, at the right time, in the right direction.

However, proponents of the extraterrestrial hypothesis counter that a single, powerful transmission may have been sufficient — especially if the source was a powerful transmitter capable of being detected across interstellar distances. The lack of repetition may also indicate that the source moved, changed frequency, or ceased transmitting.

Evidence and Investigations

The Original Data

The original data from the Wow! Signal has been preserved and analyzed by multiple researchers. The key findings include:

Signal strength: 30 times the background noise — the strongest signal ever detected at 1420 MHz
Duration: 72 seconds — consistent with a fixed point source passing through the telescope’s beam
Frequency: Exactly 1420 MHz — the hydrogen line, the most logical frequency for interstellar communication
Direction: Constellation Sagittarius — near the star Tau Sagittarii
Intensity profile: Smooth, symmetrical curve — consistent with a point source, not a diffuse emission

Subsequent Searches

The Wow! Signal has been the subject of extensive follow-up observations:

1977-1978: The Big Ear telescope monitored the same region of sky for more than 200 hours. The signal was never detected again.
1987: The Very Large Array (VLA) in Socorro, New Mexico, conducted a targeted search of the Wow! Signal’s region. No signal was detected.
1995-1996: The Hughes Aircraft Company’s radio telescope in California monitored the region for more than 100 hours. No signal was detected.
1999-2003: The SETI Institute monitored the region using the Allen Telescope Array (ATA). No signal was detected.
2007-2009: The Big Ear was demolished to make way for a golf course, ending its ability to conduct follow-up observations.

Expert Opinions

The Wow! Signal has been analyzed by astronomers, physicists, and SETI researchers for nearly five decades. The consensus view — as expressed by Dr. Carl Sagan — is that the signal is “genuinely mysterious” and deserves further investigation, even if its origin may ultimately prove to be natural.

Professor Robert Gray — an amateur astronomer who has conducted extensive follow-up observations of the Wow! Signal — has argued that the signal is most consistent with an extraterrestrial origin. Gray’s analysis, published in the journal Astrophysics and Space Science, noted that no natural phenomenon has been identified that could produce a signal with the Wow! Signal’s characteristics.

Dr. Antonio Paris — an astronomer and former NASA contractor — conducted a targeted search of the Wow! Signal’s region in 2017 and detected a signal at a nearby frequency. Paris hypothesized that the original signal may have been produced by a hydrogen cloud surrounding a comet — 266P Christensen — that was passing through the region in 1977. However, this hypothesis was disputed by other astronomers who noted that cometary hydrogen clouds are far too weak to produce a signal as strong as the Wow! Signal.

“If the Wow! Signal was extraterrestrial, it was the most important discovery in human history. If it was natural, it was the most interesting anomaly in radio astronomy.” — Robert Gray, astronomer

What Do You Think?

The Wow! Signal is a paradox — the most exciting signal in the history of radio astronomy, and one of the most frustrating. It had every characteristic of an extraterrestrial transmission: the right frequency, the right strength, the right duration, and the right direction. And then it vanished — never to be seen again.

Was the Wow! Signal a deliberate message from an alien civilization — a single, powerful “hello” from a distant star system? Or was it a natural phenomenon — a hydrogen cloud, a passing comet, or an atmospheric reflection — that happened to mimic the characteristics of an artificial signal?

The answer may be unknowable. The Big Ear telescope is gone. The signal has not repeated. The data is all that remains. But the Wow! Signal endures — a tantalizing hint that we may not be alone.

Summary

The Wow! Signal was a 72-second radio signal detected by the Big Ear telescope on August 15, 1977
It was 30 times stronger than background noise and matched the 1420 MHz hydrogen line — the most likely frequency for alien communication
It was never repeated — despite more than 50 years of searching
No natural explanation has been universally accepted
Bottom line: The Wow! Signal is the strongest candidate for an extraterrestrial radio signal ever detected — and it remains unexplained