# Four radio searches found nothing

> The Allen Telescope Array (1-9 GHz), Breakthrough Listen at Green Bank (1-12 GHz, down to 100 mW) and two FAST searches (narrowband to 2.9 mW, periodic…

Source: https://mysteriesdept.com/mysteries/3i-atlas/evidence/EVD0DFQ542ADEGE/four-radio-searches-found-nothing  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[3I/ATLAS](https://mysteriesdept.com/mysteries/3i-atlas)Evidence

Evidence · 3I/ATLAS

# Four radio searches found nothing

The Allen Telescope Array (1-9 GHz), Breakthrough Listen at Green Bank (1-12 GHz, down to 100 mW) and two FAST searches (narrowband to 2.9 mW, periodic to 0.15 W) found no artificial signal.

Supported0

## What it means

Key question[Is 3I/ATLAS a natural comet or a technological object?](https://mysteriesdept.com/mysteries/3i-atlas/questions/QST0DFQ0N9WT65H/is-3i-atlas-a-natural-comet-or-a-technological-object)

No answer ahead yet

**Open** unchanged

Answer this evidence bears on[A technological object](https://mysteriesdept.com/mysteries/3i-atlas/answers/ANS0DFQ33XWJ6XP/a-technological-object)

Counts against1 for, 2 against

**Still possible** unchanged

What it implies
1.

Any transmitter on 3I is weaker than a few milliwatts in the bands searched.For the key question: Is 3I/ATLAS a natural comet or a technological object?

## Sources 4

[A Search for Radio Technosignatures from Interstellar Object 3I/ATLAS with the Allen Telescope Array](https://mysteriesdept.com/sources/SRC0CSKBG8Y667Z/a-search-for-radio-technosignatures-from-interstellar-object)

Sheikh et al. 2025

SRC

[Breakthrough Listen Observations of 3I/ATLAS with the Green Bank Telescope at 1-12 GHz](https://mysteriesdept.com/sources/SRC0CSKBG14072Q/breakthrough-listen-observations-of-3i-atlas-with-the-green)

Jacobson-Bell et al. 2025

SRC

[Narrowband Radio Technosignature Search toward 3I/ATLAS with FAST](https://mysteriesdept.com/sources/SRC0DFPWGSFZSGN/narrowband-radio-technosignature-search-toward-3i-atlas-with)

Li et al. 2026

SRC

[Periodic Radio Technosignature Search toward 3I/ATLAS with FAST](https://mysteriesdept.com/sources/SRC0DFPWGSFW0KK/periodic-radio-technosignature-search-toward-3i-atlas-with)

Li et al. 2026

SRC

## Cite it

```
Mysteries Department. (2026). Four radio searches found nothing [Evidence EVD0DFQ542ADEGE]. https://mysteriesdept.com/r/EVD0DFQ542ADEGE
```

Key

**EVD** 0DFQ542ADEGE

Kind

Evidence

Tier

Supported

Found in

[Session 1](https://mysteriesdept.com/mysteries/3i-atlas/sessions/SES0DFQC03S98K5/session-1-3i-atlas-opened-the-literature-to-november-2026) · 2 Nov 2026

Version

1

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