Astrophysicist suggests that the search for non-intelligent life is a better option than searching for alien civilizations. Credit: DepositPhotos

Seeking Cosmic Neighbors: 11,680 Stars Scanned for Alien Civilizations

Are we alone?


The universe remains silent, even as we intently listen. In a recent comprehensive effort led by Jean-Luc Margot from UCLA’s Earth, Planetary, & Space Sciences Department, stars within several hundred light-years were scanned for any signs of alien radio communications.

TESS Objects of Interest: Are Aliens out There?

The main focus of Margot and his team was the “TESS Objects of Interest”. These are celestial entities identified by the Transiting Exoplanet Survey Satellite (TESS). Margot’s intriguing research has recently found its place on the arXiv preprint server.

Are We Alone in the Universe? 11,680 Stars Scanned for Alien Civilizations

A monumental initiative, the “Are Alone in the Universe?” project spearheaded by Margot, delves into the possibility of other civilizations in the cosmos. The modus operandi? Scanning for radio emissions that could possibly indicate advanced extraterrestrial life.

From 2020 to 2023, the Green Bank Telescope focused on these TESS objects, specifically tuning into the spectrum between 1.15 and 1.73 GHz—a frequency range believed to be ideal for picking up potential alien signals.


The Elusive “Wow!” Signal

While a clear affirmative signal from another advanced civilization would be groundbreaking, the current search has yet to yield such results. In a definitive conclusion, the research indicates that a significant majority of nearby stars aren’t signaling us.

Historical Perspective on Space Communication

While the endeavor of unearthing extraterrestrial signatures is fairly recent, starting only in the mid-20th century, the challenges are manifold. Interstellar communication comes with considerable lags. For instance, a message to Proxima Centauri, our nearest star, would take over four years one way at the speed of light.

Additionally, factors like cosmic dust, gases, and the vast distances complicate matters. However, frequencies between 1 and 10 GHz appear to be the sweet spot, minimizing interference from the galaxy’s low-frequency “hum” and atmospheric disturbances on higher frequencies.

The Rationale Behind The Search

A distinguishing feature of this SETI search was the quest for clear technosignatures, signifying intelligent alien technology. This meant filtering out natural emissions from the likes of pulsars, star-forming regions, and even black holes. Their scope covered emissions from roughly 11,680 stars situated between 5,385 and 18,173 light-years away, all meticulously observed on specific dates in 2021 and 2023.

Community Participation and The Road Ahead

Margot’s mission is not a solitary one. With global citizen scientists collaborating in the “Are We Alone in the Universe?” initiative, over 10,000 volunteers have contributed, leading to 300,000 classifications of radio signals. UCLA also offers a SETI course, imparting skills essential for this cosmic hunt.


Despite the lack of definitive evidence from this round, the journey continues. Each search, whether it finds a signal or not, furthers our understanding and refines our techniques, ensuring that the quest for other advanced civilizations remains a pinnacle of human endeavor.

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Written by Ivan Petricevic

I've been writing passionately about ancient civilizations, history, alien life, and various other subjects for more than eight years. You may have seen me appear on Discovery Channel's What On Earth series, History Channel's Ancient Aliens, and Gaia's Ancient Civilizations among others.

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