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3i atlas signal studies


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Scientific studies on the interstellar object 3I/ATLAS (discovered in July 2025) have confirmed it is a natural comet rather than an artificial or alien spacecraft.


PBS
 +2
Radio Signal Studies & Technosignature Searches
Natural Hydroxyl (OH) Emissions: Radio observations—including detections by the MeerKAT radio telescope on October 24, 2025—identified natural hydroxyl radical absorption lines at 1.665 and 1.667 GHz (1.6 GHz range). These occur when sunlight breaks down water ice released from the comet's outgassing, which is a standard physical process in comets.

Breakthrough Listen & SETI Scans: Global facilities—including the Allen Telescope Array and the Green Bank Telescope—scanned millions of narrowband radio hits. After filtering out human-made radio frequency interference (RFI), researchers found zero artificial radio emissions, beacon signals, or technosignatures.

Spectroscopic & Composition Studies
Water-Ice and Carbon: Optical and near-infrared spectroscopy (from Gemini-South and NASA IRTF) revealed a red continuum slope resembling D-type asteroids transitioning into a broad 2.0 µm water-ice absorption feature.

Composition Model: Thermal modeling indicates the coma is comprised of approximately 63% amorphous carbon and 37% water-ice grains, confirming it behaves as an active interstellar comet roughly 11 billion years old.


IOPscience
 +1
Would you like more details on specific telescope data (such as Green Bank or Parkes limits) or the orbital trajectory of 3I/ATLAS?





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Berkeley SETI
https://seti.berkeley.edu
Breakthrough Listen observations of interstellar object 3I/ATLAS
Dec 19, 2025 — Observations of 3I/ATLAS using the Allen Telescope Array were undertaken in early July, 2025, within a few days of discovery. Data were acquired ...

Futurism
https://futurism.com
Scientists Release Results After Scanning 3I/ATLAS for Alien Signals
Jun 8, 2026 — “The results from 3I/ATLAS show how realistic it is to detect a signal with the technology we have today,” said coauthor, Breakthrough Listen ...

IOPscience
https://iopscience.iop.org
Spectroscopic Characterization of Interstellar Object 3I/ATLAS: Water Ice ...
by B Yang · 2025 · Cited by 17 — We present optical and near-infrared spectroscopy of the interstellar object 3I/ATLAS, obtained with Gemini-S/GMOS and NASA IRTF/SpeX on 2025 ...
People also ask
Did the 3I Atlas send Earth a signal?
Is 3I/ATLAS an alien object?
Should we worry about the 3I atlas?
Does NASA know what 3I atlas is?

Medium · Avi Loeb
1.4K+ likes · 12 months ago
First Radio Signal from 3I/ATLAS: Absorption by Hydroxyl Radicals (OH ...
This absorption signal constitutes the first radio detection of 3I/ATLAS. Signal detected in 1977 … 3I/ATLAS is expected to pass within 53 ...
Videos
Breakthrough Listen Observations Of 3I/ATLAS With The Green Bank Telescope ...
YouTube · NASASpaceNews
Mar 6, 2026

22s
Breakthrough Listen used the Green Bank Telescope for the most sensitive radio search on 3I/Atlas, scanning frequencies relevant to SETI.
Scientists Finally Decode the Radio Signals from 3i atlas—The Truth Is ...
YouTube · Beyond Discovery
Dec 26, 2025

21:17
Scientists decoded radio signals from 3i Atlas, an interstellar comet, confirming water from another star system and no alien technology.
Radio Signal From 3I/ATLAS Stuns Astronomers | Top Stories Of This Week
YouTube · WION
Nov 15, 2025

40s
The 3I/Atlas signal's origin is debated, with hypotheses ranging from natural resonance due to solar radiation to non-random geometry.

PBS
https://www.pbs.org
Radio scans find no evidence of alien tech from interstellar comet 3I/Atlas
Jun 3, 2026 — The team identified nearly 74 million narrow-band radio signals. only slightly more than 200 signals remained, the Astronomical Journal.
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Facebook · Space.com
180+ reactions · 4 months ago
"The results from 3I/ATLAS show how realistic it is to detect a signal ...
This video analyzes the interstellar object 3I/ATLAS, which transmitted a radio signal on October 14, 2024, at 347 UTC. The speaker describes ...

Berkeley SETI
https://seti.berkeley.edu
PDF
A Search for Radio Technosignatures from Interstellar Object 3I/ATLAS with the ...

by SZ Sheikh · Cited by 5 — In Section 3, we outline the data analysis and hit filtering that were used to search for signals-of-interest. The signals that we visually ...
12 pages·808 KB

Astronomy & Astrophysics (A&A)
https://www.aanda.org
Temporal evolution of the third interstellar comet 3I/ATLAS: Spin, color, spectra, and ...
by T Santana-Ros · 2025 · Cited by 50 — Low-resolution spectroscopy of 3I/ATLAS was performed using the 10-meter Southern African Large Telescope (SALT; Kwiatkowski et al. 2009), located in Sutherland ...
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